Submod User Manual
Contents
1. F IR SODA MA LEE ONES SESAM USER MANUAL Transfer Displacements from Global Model to Sub Model DET NORSKE VERITAS SESAM User Manual Submod Transfer Displacements from Global Model to Sub Model November 1st 2004 Valid from program version 3 0 Developed and marketed by DET NORSKE VERITAS DNV Software Report No 95 7013 Revision 3 November Ist 2004 Copyright 2004 Det Norske Veritas All rights reserved No part of this book may be reproduced in any form or by any means without permission in writing from the publisher Published by Det Norske Veritas Veritasveien 1 N 1322 Hovik Norway Telephone 47 67 57 99 00 Facsimile 47 67 57 72 72 E mail sales software sesam dnv com E mail support software support dnv com Website www dnvsoftware com If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage However the compensation shall not exceed an amount equal to ten times the fee charged for the service in question provided that the maximum compensation shall never exceed USD 2 millions In this provision Det Norske Veritas shall mean the Foundation Det Norske Veritas as well as all its subsidiaries directors officers employees agents and any other acting on behalf of Det Norske Veri2. The section does not contain a full description of all program features a more complete understanding of Submod can only be obtained through training in use while referring to Chapter 5 INPUT DESCRIPTION Chapter 4 EXECUTION OF SUBMOD contains more special information not intended for the new user employing SESAM Manager to control his SESAM analysis The section explains that Submod is a separate program and how to start Submod from Manager The files accessed by Submod are also explained Built in and hardware dependent requirements and limitations are also described In short the more advanced user will benefit by looking into this section Chapter 5 INPUT DESCRIPTION explains in detail all input to Submod Appendix A TUTORIAL EXAMPLES contains an example of use 1 4 Status List There exists for Submod as for all other SESAM programs a Status List providing additional information This may be Reasons for update new version e New features Errors found and corrected Documentation tasks not yet described in this manual Ete To look up information in the most updated version of the status list go to the support page of our website click the SESAM Status Lists link and log onto this service contact us or your SESAM contact person for login information 1 5 Terminology and Notation The terminology and notation in this manual are explained in Section 3 1 or when they first appear SESAM Submod Program version
3. 3 0 01 NOV 2004 2 1 2 FEATURES OF SUBMOD 2 1 Basic Features Submod is based on the results displacements from a global analysis Displacements are read from the result file of the global model by Submod and transferred to the boundary of a sub model The user has to specify prescribed displacements on the boundary of his sub model In addition to this the coordinates of the boundary of the sub model must be found within the global model Submod will perform a search in the global model for the nodes specified as prescribed for all degrees of freedom d o fs in the sub model The coordinates must match in highest level superelement coordinate system It is also possible to have only some of the d o fs in the boundary nodes as prescribed To obtain this the user has to give a particular command in the input file to Submod Both the global model and the sub model may consist of one or more superelements And the division into superelements and the way the superelements are assembled in the two models may be completely different The superelement numbers to specify for Submod are the highest level superelement number in the global model and the highest level superelement number in the sub model Both node to node match and node to element match is available See Analysis type in Section 5 2 For the node to element match it is possible with an automatic interpolation of displacements within shell and solid elements in the global model
4. Coupling ce ecccccecssesseceneceseesseessecceceseeeeeeeeeeseecsaecneseeeeeeeeseeeeeseeags 3 2 32136 Global Model File sermo coaeesGitn de Goi gs desc canes aah edie Haas tek tease Sealed cua snavbap easel ie T tise aeS 3 2 IL Sub ModelFlles cnica cosida aro colas 3 2 3 1 8 Coordinate Tolerance 0 0 ccecccccecccessessseesseeseceeceseesseeeseceaeceseseeceseecsaecseceseeeeeseeeeeeneeneeags 3 3 Steps in use Of SUBMO cee ececcecssecsteeseceseeeseeeseceseceseeeaeesaecsseceecseeeseeecsaecaeeneeeseeeseeeaecesecneeseneeesees 3 3 3 2 1 Creation of a Global Model Results File ccc ccccccscessceesseseeessecneceseceseeeseecseeneeseenseenaes 3 3 3 2 2 Cr ation of a Sub Model cti aiii tati ii 3 3 3 2 3 Running Submod to obtain the Boundary Displacements Driven Variables 3 4 3 2 4 Creation of the Sub Model Results File ooooonnnninncnncnionnocnoncconnconnconncnnnonn non ro nono nnnonanananos 3 5 Typical Inputto Sumo e r en eea ra i a EEEE EAEE EEE EEEE EE Ee REEE EEEE 3 5 Overlapping Display of Global Model and Sub Model cccccecccesseesseeseceseceseeeseeeseesaeenseeneeeneeeaaes 3 8 3 3 A ANA 3 9 A NUI 3 9 352 OIC ASS A A A A A A E EE 3 9 3 5 3 Checking of Results from the Sub Model RUN ooonoconocnnocnnoncnonconnconoconnoonnonnc canon nonnonnnos 3 11 3 5 4 Overlapping Display of Results from Global Model and Sub Model oonoonccniconinnin o 3 11 4 EXECUTION OF SUBMOD sd cacas 4 1 Ad PrOPrA MENO A
5. Global project Exteract displacements from first node or element within Coordinate Tolerance e NodetoElement _ 3lobal top superelement Mix3 and 6 DoF Global Superelement Scope All Figure 5 8 Analysis type PURPOSE Here the user selects node to node coupling or node to element coupling between the boundary nodes of the sub model and the nodes or elements in the global model The default is node to element coupling Node to element coupling means that the sub model boundary nodes need not align with mesh lines in the global model Submod will use spatial element shape functions interpolation of the global solution to calculate the values for the sub model boundary nodes For shell elements the rotation in the nodes are also consid ered when calculating displacements outside the element neutral plane PARAMETERS Node to Node The coupling nodes in the sub model will be coupled to nodes in the global model Node to Element The coupling nodes in the sub model will be coupled to dis placement fields in elements in the global model NOTES See also Coordinate Tolerance Submod SESAM 5 10 01 NOV 2004 Program version 3 0 Mix 3 and 6 DoF ANAND User defined Hatch Detail A Linear Matching of nodes Midship Global a Node to Node Midship Submodel 3 DOF s in sub model and 6 DOF s in nodes in global model or vice versa On or Off e Nodeto Element 3lobaltop superelement M
6. Input The following input have been implemented in SESAM Manager for execution in Submod Submod SESAM 5 2 01 NOV 2004 Program version 3 0 7FSESAM MANAGER 5 3 05 Hatch es eee Se ey ee A Click to open Sub Modelling window Input file SUBMOD INP already made or modified by user Select Global project analysis already done Extract displacement from first node within Coordinate Tolerance Specify Global top superelement Mix 3 and 6 degrees of freedom in Limit search by scope facility Coordinate Tolerance 0 001 eAdjust coordinate tolerance Click to run Submod Figure 5 1 Overview of Input to Submod in SESAM Manager 5 2 Detailed Description of Input Below is a detailed description of the input options to Submod SESAM Submod Program version 3 0 01 NOV 2004 5 3 Run sub modelling Mix3 and 6 DoF Global Superelement Scope All C Generate input file Si Coordinate Tolerance ditinnut file q Run sub modelling a Click to run Submod Figure 5 2 Run sub modelling PURPOSE This action will execute the SUB MODELLING process of searching for matching nodes in the global model finding displacements on the Results Interface File of the global model and writing these prescribed nodal displacements on the modified Input Interface File T file of the sub model NOTES See also Global Superelement Scope Coordinate Tolerance Analysis t
7. Sestra 3 3 Typical Input to Submod In this section is shown a typical input for Submod specified in SESAM Manager with a short explanation of the commands given Submod SESAM 3 6 01 NOV 2004 Program version 3 0 SESAM MANAGER 5 3 02 Submod Select f Sub modelling SUBMOD in the Model menu E Sub modelling SUBMOD Global top superelement is automatically selected Optionally specify which global superelements to search in to find boundary displ Give coordinate tolerance for the searching in the global model 0 001 suitable when length unit is metres Select Node to Node or Node to Element search for displacements Select mixing of 3 and 6 degr of freedom in nodes e g shell global and solid sub model Figure 3 2 Input to Submod in SESAM Manager SESAM Submod Program version 3 0 01 NOV 2004 3 7 aaa Specify which global Include will superelements to search include Give superelement in to find boundary displ sup el 10 noeros ng index 1 into Neat Cone Global the submodel Superelem Scope Figure 3 3 Details in Input of Global Superelement Scope Specify Typical input specification to a sub model run In Model menu in SESAM Manager select task Sub modelling SUBMOD Select Global project with results from global analysis of model Select Node to Element match This means that the nodes of the sub model do not need to coincide with
8. a suitable tolerance will be 1 0 instead PARAMETERS Coordinate Tolerance Coordinate tolerance used to search for coupling nodes hav ing the same coordinate as a node in the global model or being inside an element in the global model NOTES See also Analysis type Submod SESAM 5 8 01 NOV 2004 Program version 3 0 Global Project and Global top superelement E Sub modelling SUBMOD Select Global project analysis already done Analysis type Specify C User defined Matching of nodes Node to Node e NodetoElement 3lobaltop supereleme Specify Global top superelement number Mix3 and 6 DoF Global Superelement Scope 737 Figure 5 7 Global Project and Global top superelement PURPOSE Here the user selects the global project where the global model Results Interface File is found The Results Interface File has to be a SIN NORSAM formatted file If the global model is a superelement the number of the highest level superelement in the global analysis shall be written Normally SESAM Manager will know the superelement number of the global results file and put this in automatically The global project must exist in advance and be a project parallel to the sub model project PARAMETERS Global top superelement Superelement number for the top level superelement in the glo bal model SESAM Submod Program version 3 0 01 NOV 2004 5 9 Analysis type E Sub modelling SUBMOD
9. displacements on the sub Figure A 4 Global model and sub model in same view SESAM Submod Program version 3 0 01 NOV 2004 A 5 Sub model part Figure A 5 Displacements in global model It may be seen that the displacements in the sub model part of the global model is very much like the dis placements in the sub model in Figure A 6 Figure A 6 Displacements in sub model model Submod SESAM A 6 01 NOV 2004 Program version 3 0 Sub model part Figure A 7 Von Mises element stresses in global model Figure A 8 Von Mises element stresses in sub model SESAM Program version 3 0 01 NOV 2004 REFERENCES 1 SESAM Input Interface File File Description Report no 89 7012 Det Norske Veritas November 1996 Submod REFERENCES 1 Submod SESAM REFERENCES 2 01 NOV 2004 Program version 3 0
10. fields in elements in the global model SESAM Submod Program version 3 0 01 NOV 2004 5 11 Magnified solid sub model Only the corner nodes at the boundary surfaces are indicated Figure 5 10 Shell to Solid Sub Modelling Submod SESAM 5 12 01 NOV 2004 Program version 3 0 SESAM Submod Program version 3 0 01 NOV 2004 A 1 APPENDIX A TUTORIAL EXAMPLES One tutorial example is presented here A1 Hatch Coaming The global model is a superemenet model with the superelement hierarchy shown in the figure below R100 2 2 R10H1 SEL1 IND1 SEL2 IND1 SEL3 IND1 R10H2 SEL1 IND2 SEL2 IND2 SEL3 IND2 Figure A 1 Global superelement hierarchy This model contains of 3 first level superelements 1 2 and 3 These superelements are coupled together in superelement number 10 on 2nd level Finally superelement 10 is coupled together with a mirrored superelement 10 into 3rd level superelement number 100 The region where the sub model is to be posi tioned contains parts of superelement 1 2 and 3 on Ist level This is indicated in Figure A 2 Submod SESAM A 2 01 NOV 2004 Program version 3 0 This is a global model without mesh refinements the sub modelling technique will be used to get accurate results SEL3 IND2 No mesh refinement SEL2 IND2 SELINO SEL3 IND1 SEL2 IND1 SELI IND Figure A 2 Global Model The different tasks to be done and the sequence is as follows 1 Open a new
11. fs Coupling nodes with 3 d o fs may match solid elements or shell elements in the global model The translational displacements will be put into the sub model s T file It is the users responsibility to have the coupling nodes within or on the shell bound aries Coupling nodes with 6 d o fs may match solid elements or shell elements in the global model The coupling nodes being in a solid element will only get displacements inserted in the three first translation al degrees of freedom The last three degrees of freedom will then have 0 0 as rotations The node will then be clamped with respect to rotations unless only the 3 translational degrees of freedom of the 6 d o f s have been specified as prescribed Transfer of forces SESAM Submod Program version 3 0 01 NOV 2004 4 3 The transfer of forces from e g a beam global model to a shell solid sub model are not implemented in Submod 4 44 List of Elements Included in Submod Displacement Interpolation For node to element coupling Table 4 1 shows the different elements to fetch displacements from in the global model The interpolation is using the element shape functions to find the displacement inside an ele ment from the element s nodal displacements The interpolation performed for the different elements are Beam elements Interpolation of displacements and rotations is perfromed along the centerline of beam elements The in terpolation is implemented for both 2 and 3 n
12. model Results Interface File The displacements have been found either in nodes in the global model Node to Node or inside elements in the global model Node to Element Finally run the sub model Tnn FEM in Sestra with the boundary displacements found from the global model And look upon the results in Xtract or in another post processor Compare the results with the results of the global model to verify your run 3 4 Overlapping Display of Global Model and Sub Model The method below makes it possible to see whether the sub model is positioned correctly in the global model The global model and the sub model may be displayed in the same window by POSTFEM The view of both the global model and the sub model in the same display in POSTFEM is obtained by using Prepost to create the POSTFEM database from the Results Interface File for the global model and the T file s from the sub model with the following commands 1st run in Prepost OPEN SIN DIRECT ACCESS lt glob_mod_prfx gt lt glob_mod_nam gt OLD READ ONLY CREATE POSTFEM DATABASE POSTFEM NEW ALL SEL 1 SEL n EXIT 2nd run in Prepost READ FEM FORMATTED lt sub mod prfx gt lt sub_mod_nam gt ALL CREATE POSTFEM DATABASE POSTFEM OLD ALL T 1 T m EXIT SESAM Submod Program version 3 0 01 NOV 2004 3 9 In the above commands we have n superelements in the global model which we want to put in the POST FEM database and m superelements in the s
13. nodes of the global model But the boundary nodes of the sub model has to be inside an element in the global model Submod SESAM 3 8 01 NOV 2004 Program version 3 0 e Global model and local model has both either 3 degrees of freedom dof s or 6 dof s in the elements nodes Mix 3 and 6 DoF off 3 dof elements are typically solid elements While shell elements are typically 6 dof elements e Global top superelement number is automatically found by SESAM Manager from the global project e Figure 3 2 Select All the superelements in the global model to search for geometric match of the boundary nodes of the sub model Figure 3 3 Select Global Superelement Scope number 10 index 1 as target in the global model for the geometric search for match of the boundary nodes from the sub model The coordinate tolerance is set to 0 001 metres This is usually suitable for a model with dimensions modelled in metres The tolerance very much depends on the thickness of plates and structure elements In the Node to Element match the tolerance is converted inside the program to a relative tolerance for each element in the global model The consequence of this is that the actual tolerance is much smaller out of plane than in plane for most shell elements in plane dimensions are usually much larger than thickness e Start Submod by clicking the Run Sub modelling button e Sub model boundary displacements are now fetched from the global
14. the first level The program convention is to use the same prefix and name as the original T files On PC MS Windows the old T file will get bak added to the file type as shown below MS Windows new file lt prefix gt T lt superelement number gt FEM old file lt prefix gt T lt superelement number gt FEM bak 3 5 2 Loadcases The Submod program produces loadcases on first level in the sub model which correspond to resultcases on highest level in the global model This means that when using superelements in the sub model load combi nations must be made for each higher level superelement by using Presel before performing the sub model analysis These load combinations must usually be in a one to one correspondence The first loadcase on first level must be the first loadcase on highest level and so on up to the highest loadcase number An exep tion from this is for repeated superelements as shown in the figure below and described below The resultcase numbering found by Submod on the global Results Interface File is the internal sequential resultcase numbering Possible external result numbering made by Prepost or other programs are not recog Submod SESAM 3 10 01 NOV 2004 Program version 3 0 nised Result combinations made e g in Prepost are found sequentially after the basis resultcases on the glo bal Results Interface File For repeated superelements in the sub model number of resultcases are used as offse
15. the load combination has to be performed for these higher level superelements of the sub model The load combination must be performed for sub models comprised of higher level superelements even when no internal loads exist yet A warning is then given during the load combination in Presel WARNING LOAD CASE 1 ACCEPTED BUT NOT YET DEFINED ON FIRST LEVEL LOAD MUST BE GENERATED BY LOAD PROGRA LOAD PROGRAM is in this context Submod which will generate the values of the prescribed displace ments for the different loadcases for the first level superelements Internal loads from Wadam on repeated superelements in the sub model are not allowed due to the loadcase numbering being different for repeated superelements in the L files from Wadam and the T files from Sub mod When having n resultcases in the global model Submod stores all the prescribed displacements for position of the repeated sub model superelement as the first n loadcases on the superelement s T file The n loadcases with prescribed displacements from position 2 of the repeated sub model superelement are stored on the superelement T file after the first n loadcases from position 1 of the repeated sub model superelement as shown in Figure 3 4 When having n resultcases in the global model and 2 repetitions of the sub model superelement Wadam will store the loads from position 1 of the repeated sub mo
16. user or the input file may be generated by SESAM Manager and modified afterwards by the user For description of the format and commands to the input file see Section 4 5 User Input File Transfer between SESAM Manager and Submod SESAM Submod Program version 3 0 01 NOV 2004 5 7 Coordinate Tolerance Linear Matching of nodes Midship Global y Node to Node Midship Submodel Mi e NodetoElement 3lobal top superelement Mix3 and 6 DoF Global Superelement Scope a All lt a Specify Generate input file y a ioe ordinate Tolerance jo 001 D Adjust coordinate tolerance it input file Run sub modelling Close Figure 5 6 Coordinate Tolerance PURPOSE The command specifies the coordinate tolerance used for deciding the tolerance for node match or match with elements of global model when Matching of nodes gt Node to Element has been chosen The toler ance describes the distance between two points in 3D space to decide whether two points nodes have the same location or not or for deciding whether a node lies inside an element or not The use of the coordinate tolerance is a bit different when used in the node to element coupling than when used in the node to node coupling For details see Section 3 1 8 Coordinate Tolerance The coordinate tolerance is given in the same unit as the coordinates The default value is 0 001 This value is suitable when the model has length unit meter If the length unit is mm
17. 00 coupling nodes the clock time used with version 3 0 01 was a little more than 6 hours Both the global model and the sub model were shell type structures with 6 dof nodes The PC had 1 GB memory and a Pentium 4 1 6 Ghz processor 4 2 2 Storage Space The main storage space is from reading in the global model Results Interface File R file plus the sub model s Input Interface File T file This will be the main content of the program s database 4 3 Program Limitations The following constraints prevail in the present version of Submod e Coordinate system Submod SESAM 4 2 01 NOV 2004 Program version 3 0 The highest level superelement in the global model and the highest level superelement in the local sub model must have the same coordinate system The coupling nodes must not have local nodal transformations e Same units of global model and sub model The length units must be the same in the global model and the sub model The other units do not always need to be the same but it is recommended to avoid problems One occurrence of sub model Only one occurrence of the sub model will be accounted for in the sub modelling module Multiple oc currences must be solved by consecutive runs Specification of coupling nodes Coupling nodes must be defined as nodes with prescribed d o fs in the sub model first level elements be fore starting Submod Default setting is that only nodes where all degrees of freedom
18. 04 5 5 Superelement Index First level superelement index number position number in the global model larger than 1 only if a superelement type is repeated in the global model EXAMPLES E Sub modelling SUBMOD Analysis type Global project a Specify C User defined Matching of nodes Node to Node Node to Element 5lobaltop superelement Superelement Type Mix3 end 6 DoF Global Superelement Scope Ajj Superciemant inde A Specify Generate input file nels Ta Include Exclude Overwrite Edit input file Insertbefore Clear Help Run sub modelling Close Figure 5 4 Example of input to Global Superelement Scope Submod will here search for match in the global model in superelement number 161 with index 1 superele ment 161 with index 2 and superelement number 17 with index 1 Ifone or more of these superelements do not exist in the global model a warning will be written out If none of them exist there will be nothing to search in for Submod LIMITATIONS Maximum number of pair of superelement type numbers and indices is 1000 Submod SESAM 5 6 01 NOV 2004 Program version 3 0 Analysis type gt User defined E Sub modelling SUBMOD Analysis type Specify Input file SUBMOD INP already Input file name 5 made or modified by user Edit input file Run sub modelling Close Figure 5 5 Analysis type gt User defined PURPOSE The input file to Submod may be made directly by the
19. FEM database and m superelements in the sub model which we want to put in the POSTFEM database The BUILD command with ALL transformations is later used in POSTFEM to obtain both the global model and the sub model in the same POSTFEM model The verification in this way of the boundary displace ments being equal in the global model and the sub model is particularly of great value SESAM Program version 3 0 Submod 3 12 01 NOV 2004 superimposed view Match of displacements on the sub model boundaries may then be verified graphically LORS TS SS FIRN Ne lt a N NG NIN YVON A EH a y Figure 3 5 Sub model superimposed on the global model SESAM Submod Program version 3 0 01 NOV 2004 4 1 4 EXECUTION OF SUBMOD 4 1 Program Environment To be able to start the program Submod the executable Submod file should be located on the official SESAM directory The normal way of starting Submod is from the SESAM Manager program The execu tion of Submod is started with the sub command Sub Modelling SUBMOD of the Model command in SESAM Manager 4 2 Program Requirements Submod is a relatively small program The requirements are to a large degree dependent on the size of the global model and the sub model 4 2 1 Execution Time For a run where the global model has 22600 nodes 41250 elements 6 resultcases and the sub model has 434000 nodes 145000 elements 16
20. The interpolation is based on the element shape function of the ele ments used in the global model The interpolation in shell elements may also be performed orthogonal to the neutral plane of the elements in the thickness direction This may be useful for a solid sub model when having a global shell model Interpolation for beam elements are however only performed along the neutral axis Interpolation in the global model is performed for all beam elements 2 and 3 node elements all shell ele ments 3 4 6 and 8 node elements and all solid element 4 6 8 9 15 and 20 node elements This feature involves the following sub tasks in the program Searching for the element in the global model and finding the normalised element coordinates 6 n and E of the matching elements that contains the node from the sub model Submod SESAM 2 2 01 NOV 2004 Program version 3 0 e Handling of element boundary situations in a proper manner If the sub model node is outside the global model the program will use a tolerance to check whether it is near enough to be defined as lying on the element surface In order to reduce the number of first level superelements in the global model that Submod shall search through to find matching elements containing the nodes a scope feature has been implemented This may significantly reduce the CPU time required To avoid searching in element types of no interest an option to exclude element types beam s
21. a e 4 1 4 2 TAN IN 4 1 42l EXECUION LME 55 os sak cas Fae ATEO en a Ii iaa diia boos 4 1 ADD Storage Sp te ii o a E A ads 4 1 A3 o Program LIO cit s a a a a a aa n a a as 4 1 4 4 List of Elements Included in Submod Displacement Interpolation oooncononinnnnnnniccnonncornconnnanonnnos 4 3 4 5 User Input File Transfer between SESAM Manager and Submod ooooonoccconcooncoononnnonnnonnncononanonnnos 4 5 5 INPUT DESCRIP PION cinc a en 5 1 SPRE REN DR ene EME Sar Com ORE CNR Ng OTE 5 1 5 2 Detailed Description Of Inputecr cccsczes ceezs iii idad id eiii dicta 5 2 Rumsub moOde ling ic di 5 3 Global Superelement Scope tudo oi tE E EEEE EEEE E teca aia 5 4 Analysis type gt User defined crna anene na a ia aa iT EE PES aaae 5 6 Coordinate Tolea e a a a e atinada tocaba 5 7 Global Project and Global top superelement 20 0 0 cc cccecccceseessceeeceseeescecseceseceseenseesaecaeceeeeeeeenseessees 5 8 AMAL YSIS EY E A A Revue a tet aetet else Puiu A A ahs hel ds 5 9 MIS ando DOES xsncccsesiessctetsae a tease ico 5 10 APPENDIX A TUTORIAL EXAMPLES oconcoonnccoonoccconoccoconccccnnccccnccconnccoconccoconccoconononeconoss A 1 AL Hatch CA a spavdaaseades A 1 REFERENCES 0 dias REFERENCES 1 SESAM Submod Program version 3 0 01 NOV 2004 1 1 1 INTRODUCTION 1 1 Submod Sub Modelling The sub modelling technique allows a part of a global model to be re analysed to produce more accurate results locally The basic procedure is e P
22. are prescribed will be taken as coupling nodes This may be re defined in input to Submod to achieve that all nodes with any d o fs prescribed will be taken as coupling nodes Scope of superelements A list of superelements in the global model assumed to contain coupling nodes of the sub model By de fault all superelements will be scanned for nodes or elements to be coupled to but the user may specify superelements in the global model to scan or superelements not to scan for nodes or elements to get dis placements from e Resultcases All resultcases from the global model will be applied to the sub model as 1st level local loadcases Rep etition of 1st level superelement in sub model n times will result in n times number of loadcases for this 1st level superelement If only some of the global loadcases are to be analysed this may be achieved by using Prepost to copy these resultcases to a new results SIN file for the global model before starting Submod Complex resultcases will be handled Element types For element node coupling all available shell elements i e 3 4 6 and 8 node elements and all available solid elements i e 4 6 8 10 15 and 20 node elements are implemented The 2 and 3 node beam ele ments are also implemented but the displacement may only be found interpolated along the neutral axis of the beam elements e Coupling nodes The coupling nodes of the sub model must have 3 or 6 d o
23. del superelement as loadcase number 1 3 5 n 2 1 on the superelement L file The loads from postition number 2 will by Wadam be stored as loadcase number 2 4 6 n on the superelement L file The sub model may also be a modification of a superelement of the global model with for instance a finer mesh than used in the superelement in the global model The supernodes must then be re defined as nodes with prescribed displacements also called driven or sub model nodes 3 2 3 Running Submod to obtain the Boundary Displacements Driven Variables From the previous steps is obtained a Results Interface File R file for the global model and Input Interface File T file from the sub model The sub model has prescribed displacements defined for its boundaries but no values of these prescribed displacements have been specified By running Submod and specifying the names of the results file of the global model and the T file a new T file is made This file also contains the values of the prescribed displacements on the boundary of the sub model SESAM Submod Program version 3 0 01 NOV 2004 3 5 3 2 4 Creation of the Sub Model Results File The Input Interface File s T files obtained for the sub model by running Submod may be run through Ses tra to create a results file for the sub model This results file may be postprocessed If necessary the sub model may be modified in GeniE Patran Pre Prefem and or Presel and re run in Submod and
24. el A sub model is a single or multi superelement model forming a part detail of the global model The superelement subdivision in the sub model may be completely different from that of the global model Global Sub Model Superelement 11 Super Super element element Superelement 12 21 22 Figure 3 1 Independent organisation of superlements in global and sub model 3 1 3 Coupling Node Driven Node and Driven Variables A coupling node is a node on first level in the sub model to receive prescribed displacements in all degrees of freedom The coupling node defines where in the global model the displacement results should be trans Submod SESAM 3 2 01 NOV 2004 Program version 3 0 ferred to the local model The driven variables are the degrees of freedom in the coupling nodes The values of the driven variables are defined by interpolation of the global solution Another name of the coupling nodes is driven nodes 3 1 4 Node to Node Coupling Node to node coupling means that the sub model boundary nodes must match within the tolerance speci fied the nodes of the global model Submod will use the nodal displacement values of the global model as prescribed displacement values for the sub model boundary nodes the driven variables If the first level superlements in question of the global and local models have different coordinate system orientation then the values of the driven variables will be transformed accordingly be
25. erform a global analysis of the structure e Create a sub model with refined mesh of a region of interest e Interpolate the displacements computed for the global model and transfer to the boundary of the sub model e Analyse the sub model using the interpolated displacements as prescribed forced displacements and obtain a more accurate solution for the region To take advantage of the sub modelling technique you do not need to make any provisions prior to the glo bal analysis It is an option you have after having performed a global analysis e g the whole structure and it is evident that the results are not detailed enough in certain areas You then create a new model a sub model for the area of interest and use Submod to interpolate and extract results from the global model and to apply these onto the sub model When creating the sub model the geometry model input of the global model may be adequate or at least be a good starting point The finite element mesh of the sub model is normally fine so as to produce more accurate results within the sub model region Both the global model and sub model may be superelement models and the division into superelements and the way the superelements are assembled in the two models may be completely different It is possible to make minor changes to the geometry of the sub model to study the effect of alternative designs or to model more accurately details that were neglected in the global analysi
26. fore transferred to the first level sub model Input Interface Files T files 3 1 5 Node to Element Coupling Node to element coupling means that the sub model boundary nodes need not coincide with nodes of the global model Submod will use spatial element shape function interpolation of the global solution to calcu late the prescribed displacement values for the sub model boundary nodes the driven variables If the first level superlements in question of the global and local models have different coordinate system orientation then the values of the driven variables will be transformed accordingly before transferred to the first level sub model Input Interface Files T files 3 1 6 Global Model File The global model file is the Results Interface File in SIN format of the global model Displacements are fetched from this file 3 1 7 Sub Model Files The sub model files are a set of Input Interface Files T files containing the sub model FE model internal loads and material data Prescribed displacements will be written to these files The name of highest level T file should be given as input to Submod the remaining files will be nested up and read by the program In addition to the first level T files internal loads from wave loading programs like Wajac Wadam may also be present on Load Interface Files L files If no internal loads exist the prescribed displacements from Submod will be the only loads on the first leve
27. h Shell thin thick shell stiffened plates Subparametric curved multi Curved quadrilateral eccen LCQS layer eccetntric quadrilateral g 6 tric sandwich Shell thin thick shell stiffened plates Solid flat Tetrahedron TETR Solid linear tetrahedron 4 3 Solid flat Wedge TPRI Solid linear wedge 6 3 Solid flat Hexahedron LHEX Solid nate HO cnearen With 8 3 bubble modes Solid curved Tetrahedron ITET Solid id 10 3 ric tetrahedron Solid curved Wedge IPRI pona o 15 3 ric wedge Solid curved Hexahedron IHEX Soud a paran 20 3 ric hexahedron SESAM Submod Program version 3 0 01 NOV 2004 4 5 SHELL 6NODES COMPOSITE 6NODES SHELL 3NODES SHELL 8NODES COMPOSITE 8NODES SHELL4NODES SOLID4NODES SOLID 1ONODES SOLID 6NODES SOLID 15NODES SOLID 8NODES SOLID 20NODES Figure 4 1 Graphic illustration of shell and solid element types 4 5 User Input File Transfer between SESAM Manager and Submod The below information is for the particularly interested users This is a description of the Submod user input file made by SESAM Manager and read by Submod The file is written in FORTRAN formatted free format The name of the User Input Transfer File is SUBMOD INP Submod may be run separately if this file exists on the default directory before Submod is executed The following input commands are available Definintion of input file SUBMOD INP o o All text start
28. hell or solid from the search is included 2 2 Overview of Files Submod is reading displacements from the global model s Results Interface File and writing boundary dis placements on the sub model s first level T files Both the global model and the sub model may consist of one or more superelements Loads on the sub model have to be taken either from Wadam wave load program or from a pre processor Patran Pre GeniE Prefem In Patran Pre you may choose to start modelling of the sub model using the global model s database and only write out the sub model part as the sub model s T file Loads generated on the geometry will then automatically be transferred to the sub model For loads to be generated by Wadam the global panel model may normally be used for the calculation of wave loads on the sub model SESAM Submod Program version 3 0 01 NOV 2004 2 3 Sub model Sub model WADAM F a Sub model neme mea e al bees ew ewe ew ee ee ee eee e Care MSS A SZ Fees eeeeee222 SESTRA ween e e Ster oos PIANO SS CRs DAR Cm mon _ sub modetting Files t Results p i URE gt Standard Files Only superelements on lst Interface antad res level in the sub model A p have been modified with y Sub model_ y See a prescribed displacements Figure 2 1 The file environment of Submod 2 3 Transfer of Data through the SESAM Interface File System The data read written by Submod is
29. ing anywhere with a Submod SESAM 4 6 01 NOV 2004 Program version 3 0 character is a comment SMCOOTOL lt nrec gt lt cotol gt Coordinate tolerance SMGLOPRF lt nrec gt lt gprfix gt Global results file prefix SMGLONAM lt nrec gt lt gname gt Global results file name SMMATELN lt nrec gt lt match gt Match node node or node element SMMIXDOF lt nrec gt lt mixdof gt Mixed 3 to 6 DOF on or off SMNTSRCH lt nrec gt lt notsrch gt Exclude search in beam shell solid SMSKBNBX lt nrec gt lt skip gt Skip optimisation with boundary box search SMSOMEDF lt nrec gt lt somedf gt Not all DOF s driven in coupl nodes SMSSCOPE lt nrec gt lt iscpfl gt lt nsel gt Global super element scope lt supel gt lt index gt Super element number and index if lt supel gt lt index gt limited scope defined lt supel gt lt index gt SMSUBNAM lt nrec gt lt sname gt Interface file name for the sub model SMSUBPRF lt nrec gt lt sprfix gt Interface file prefix for the sub model SMENDFIL lt nrec gt End of file detected Parameters lt cotol gt real Coordinate tolerance lt gname gt text 250 Global results file name lt gprfix gt text 250 Global results file prefix lt index gt integer Super element index lt iscpfl gt integer Scope flag 0 All 1 Include 2 Exclude lt match gt in
30. ix3and6Dol z Specify Generate input file hare ordinate Tolerance Edkinputsio Run sub modelling Close Figure 5 9 Mix 3 and 6 DoF PURPOSE This option allows shell to solid sub modelling with nodes in the sub model with 3 degrees of freedom d o f and nodes in the global model with 6 d o f Nodes with 3 d o f in the sub model may also be coupled to shell elements with 6 d o f The coupling of nodes in the sub model with 6 d o f to nodes or elements in the global model with 3 d o f will also be allowed But the user should then observe that the prescribed displacements in the remaining 3 rotational degrees of freedom will be set equal to 0 0 fixed unless the user has specified only prescribed displacements for the three translational d o fs for these nodes on first level in the sub model See the next paragraph It is also possible to have coupling nodes in the sub model where only some d o f are defined as coupling degrees of freedom The command to make this possible in Submod is at the moment only available as direct input in the SUBMOD INP file For information on how to do this see the command SMSOMEDF in Section 4 5 User Input File Transfer between SESAM Manager and Submod The default is that the Mix 3 and 6 DoF option is set to OFF PARAMETERS On The coupling nodes in the sub model will be coupled to nodes in the global model Off The coupling nodes in the sub model will be coupled to dis placement
31. l T files When higher level superelements are used in the sub model the Presel load combination has to be performed for the higher level superelements The loads to combine are the prescribed displacements subsequently written to the T files by Submod Internal loads from Wajac Wadam on repeated superelements in the sub model is not possible due to the loadcase numbering being different for repeated superelements in Wajac Wadam and Submod SESAM Submod Program version 3 0 01 NOV 2004 3 3 3 1 8 Coordinate Tolerance Node to Node Coupling The coordinate tolerance for node matching must be given in the same unit as used by the global and sub model structures The tolerance is the maximum allowable distance between a driven node in the sub model and a node in the global model Node to Element Coupling For node to element coupling the coordinate tolerance is how far away a node in the sub model may be from an element in the global model and still be taken as being inside the element But the use is a little bit different from the use of the coordinate tolerance in the node to node coupling For node to element cou pling the coordinate tolerance is transformed to a relative tolerance for each element searched through in the global model This relative tolerance is calculated as the specified coordinate tolerance divided by the diag onal in a bounding box around each element in the global model The consequence of this is that the actual to
32. lerance is much smaller out of plane than in plane for most shell elements in plane dimensions are usu ally much larger than the thickness This method with calculation of a relative tolerance will only map the user s tolerance exactly for a cube with sides parallel to the x y and z coordinate axes 3 2 Steps in use of Submod Independent analyses are performed on the global model and on the sub model The only link is the transfer of displacement values for the driven variables 3 2 1 Creation of a Global Model Results File The user runs a global model calculation through Sestra the linear Finite Element Method program and obtains a Results Interface File for this model If the user then wants to Study detailed stresses and displacements in a specific area of this model e Model some detail differently or more accurately e Model some detailswith solid elements instead of shell elements he may create a separate model for this part as described below 32 2 Creation of a Sub Model By using GeniE Patran Pre Prefem and or Presel or a similar program a sub model of a part of the global model may be created This sub model may consist of one or more superelements and the part of the global model may be chosen without considering where the superelement boundaries are in the global model The boundaries of the sub model to be given displacements taken from the results of the global model have to be given prescribed displaceme
33. nts type of boundary condition in the first level superelements of the sub model These prescribed displacements will later be transferred from the results file of the global model The coordinates of the boundaries of the sub model must have the same coordinates as the same positions in the global model The coordinates are in this context the coordinates in the highest level superelement of Submod SESAM 3 4 01 NOV 2004 Program version 3 0 the global model and the sub model This means that the user may model his sub model in any convenient coordinate system and later translate and rotate the sub model into a higher level superelement to obtain the same coordinates as in the global model The first level superelement of the sub model may for instance have only one supernode which subsequently is included in the second level transformation superele ment The mesh on the boundary of the sub model may be different from the mesh of the same part of the global model The element types may also be different but the results will probably be best when using ele ments of the same order in the global model and the sub model The internal loads of the sub model must be modelled for the sub model since only the effect of the loads outside the sub model will be accounted for by the boundary displacements Internal wave loads when present must also be modelled for the sub model If the sub model is comprised of higher level superele ments then
34. oads like water pressure are not very important on local sub models In some cases the internal loads may be achieved directly from the geometry of your global mod el by using the global model in the preprosessor as basis for your sub model 6 Run Submod from the SESAM Manager menu Model gt Sub modelling SUBMOD Remember to change the Coordinate tolerance if your model does not have length unit meters 7 Check your sub model run in the information file from Submod SUBMOD MLG The displacements from the global model have now been writtten to the coupling nodes on your Ist level T file s The displacements are written to the BNDISPL records on the T file T1 FEM gt Only the first level T files of the sub model are modified by Submod 8 Run Sestra for your sub model to get a results file e g R1 SIN Sestra will read the T and possible L files and make the results file R1 SIN for your sub model 9 Check the results for your sub model in Xtract or another postprocessor program The stresses on the boundaries may be locally high but this is usual just a local problem The stress level should generally reflect the same stresses in the global model This is a sub model of the corner area Figure A 3 Sub Model SESAM Program version 3 0 Submod A 4 01 NOV 2004 Displacements may be presented for this model boundaries may then superimposed view Match of be verified graphically
35. ode beams Shell elements Interpolation of displacements and rotations is performed in shell elements both in the shell plane and in the thickness of the shell elements This means that a global model with shell elements can be used to gether with a solid sub model with one or more solid elements in the thickness direction Solid elements Interpolation of displacements is performed in solid elements Table 4 1 Element Types Element Type Abbrev Description aoe D O F Straight Beam BEAS 2 node straight beam 2 6 Curved Beam BTSS 3 node curved beam 3 6 Flat triangular Shell FTRS Triangular flat thin shell 3 6 Quadrilateral flat thin shell Flat Quadrilateral Shell FQUS with bubble modes in the 4 6 membrane part Subparametric curved trian Curved triangular Shell SCTS euler thin thick shell 6 6 Subparametric curved quatri Curved quadrilateral Shell SCQS lateral thin thick shell 8 6 R Subparametric curved multi Cur een eae spnawigh MCTS layer triangular thin thick 6 6 Shell shell Subparametric curved multi MCQS layer quadrilateral thin thick 8 6 shell Curved quadrilateral sand wich Shell Submod 4 4 01 NOV 2004 SESAM Program version 3 0 Table 4 1 Element Types aves No of Element Type Abbrev Description NODES D O F Subparametric curved multi Curved triangular eccentric LCTS layer eccetntric triangular 6 6 sandwic
36. project in SESAM Manager for your global model Hatch Coarse 2 Model the global model as one superelement structure or as a multilevel superelement structure This may be done with GeniE Patran Pre Prefem Wadam and or Presel The output from these programs will be T files with finite element information elements nodes loads a s o and L files with wave load information 3 Run Sestra for your global model to get a results file e g R100 SIN Sestra will read the T and pos sible L files and make the result file R100 SIN 4 Open a new sub model project Hatch Detail parallel to your global project With parallel is meant a project with the same root directory as the global project 5 Make your sub model with GeniE Patran Pre Prefem Wadam and or Presel If your model has been made in a coordinate system other than that for the global model Presel may be used to position your sub model to the correct coordinates in the global model If you want to use the superelement technique SESAM Submod Program version 3 0 01 NOV 2004 A 3 Presel to do this remember to make at least one dummy supernode on your Ist level sub model superelement The local internal loads on your sub model has to be modelled in the sub model even if they are present on your global model It is only the displacements in the coupling nodes that is found from the global model However usually the local internal l
37. s This can only be done provided the changes within the sub model region have negligible effects on the global solution Submod SESAM 1 2 01 NOV 2004 Program version 3 0 The sub modelling program Submod exe is executed through SESAM Manager SESAM Manager cre ates an input file to Submod SUBMOD INP based on the input parameters given in the sub modelling input window This file may be updated and modified with additional commands through a text editor The format of the input file to Submod is described in Section 4 5 analyse me Pate Figure 1 1 Illustration of the sub modelling technique 1 2 Submod in the SESAM System SESAM is comprised of preprocessors environmental analysis programs structural analysis programs and postprocessors An overview of SESAM is shown in Figure 1 2 with Submod shown in the preprocessor part Submod SESAM 1 3 01 NOV 2004 Program version 3 0 DINISSHIOUdLSOd i E r SISNTVNV TV LNAINNOUANGA SISVIVNV TVWa boners SADVMIVA BE INV ADONd E 4 CL LVADOLLNI NISSHTJOA Fel Ra Fal CRAT DONNI Figure 1 2 SESAM overview Submod SESAM 1 4 01 NOV 2004 Program version 3 0 1 3 How to read the Manual Chapter 2 FEATURES OF SUBMOD contains an introductory description of the major features and pur pose of the program Chapter 3 USER S GUIDE TO SUBMOD explains how to start the program and how to extract displace ments from a global analysis and impose these on the sub model
38. s are created in e g POSTFEM with the same contour range results will be valid if contour values coin cide at the boundary of the sub modeled region or in the same display as described below in Section 3 5 4 In addition to this the boundary of the sub model must be sufficiently far from the region of the sub model where the response changes St Venant s Principle Some stress disturbances or consentrations on the boundary of the sub model should however be expected due to differences in the displacement shape functions of the sub model and the global model 3 5 4 Overlapping Display of Results from Global Model and Sub Model The method below makes it possible to verify the stresses and displacements on the boundary of the sub model The displacements and stresses of the global model and the sub model may be displayed in the same win dow by POSTFEM The view of both the global model and the sub model in the same display in POSTFEM is obtained by using Prepost to create the POSTFEM database from the two result files with the following commands OPEN SIN DIRECT ACCESS lt glob_mod prfx gt lt glob_mod_nam gt OLD READ ONLY CREATE POSTFEM DATABASE POSTFEM NEW ALL SEL 1 SEL n OPEN SIN DIRECT ACCESS lt sub_mod_prfx gt lt sub_mod_nam gt OLD READ ONLY CREATE POSTFEM DATABASE POSTFEM OLD ALL SEL nt1 SEL_n m In the above commands we have n superelements in the global model which we want to put in the POST
39. t for each new position of the superement For example if there are 3 resultcases on highest level in the global model there will be 3 loadcases per Ist level superelement occurrence in the sub model Figure 3 4 Global Model Top Level Sub Model 1 st Level Sub Model Top Level Occurrence 1 Resutease 1 zoi Loadeaset I I I I I I I 1 I I ale Resultcase 3 j m Loadcase a a a a a eee eee eee a an ie m e nn e Figure 3 4 Relation between Global Resultcases and Sub Model Loadcases Global results files may have results from more than one run This may be obtained for instance by the MERGE command in the program Prepost Submod will account for all these resultcases The results from run no 1 will be used as the first resultcases and the resultcases from run no 2 will be numbered after the resultcases from run no 1 and so on This means that Submod will write displacements on the sub model s Ist level superelements for as many resultcases as the sum of number of resultcases from the different runs SESAM Submod Program version 3 0 01 NOV 2004 3 11 3 5 3 Checking of Results from the Sub Model Run The user must ensure that the sub modelling approach is applicable There are no default protections when utilising the sub modelling technique it is a matter of user s judgement Examine contour plots of important variables near the boundaries of the sub modeled region If the contour plot
40. tas 1 1 1 2 1 3 1 4 1 5 2 1 2 2 2 3 3 1 3 2 3 3 3 4 Table of Contents INTRODUCTION vicjssecensccaiuccscnuedess vasesinnsesotetoakusesduacSevesensbedecevenestnesesietouasescvecsovecssekeaders 1 1 Submod Sub Modelling ccc cccccsccessceseeeseeeeceseceseeeeeesseessecsseceeeseeecesecaaeceaeseeeseeeeseeesseseeeseeeenees 1 1 Submod in the SESAM System enorer rine a slednts aa isa ie 1 2 How torad the Manual iia dese tice da ii aae TER ESS 1 4 SHAMS St e a shee ue A da diia 1 4 Terminology and Notation c ccccccessecssessscesscseeeeseeesceeseceseceseseeecesecsaecsaeseeeseeeeseecaaecaecseeseeeaeeeeenaes 1 4 EEA TURES OF SUBMOD ii sssesdssscseatassatenssscaseesciseselussiokasdesseedastessavansssassesdsiseseluasseiacdasshs 2 1 Basic Feature S ie coves cc cai van A A EE EA A ad 2 1 Overview of Fleitas 2 2 Transfer of Data through the SESAM Interface File System ooooncinccinnnccnonconcncnornnnccononocancnnnonncnno 2 3 USERS GUIDE TO SU BMOD wiisccccsstnccisssssncccasssoccncaasncacsdasassceansedscassennssddzsadscadscbuseatsnsen 3 1 Definitions AA AA Reed oad sue Caan Wane i de Ga AA E AAA Seed ade edits 3 1 3 1 1 Global Model A eee aes ania 3 1 A A O O AA 3 1 3 1 3 Coupling Node Driven Node and Driven VarlableS oooonnonncoinconnnconncoononononnnnonocnnonass 3 1 3 14 Node to Node Coupling ccccccccccccesseeseeseceseceseeesecseecaeseeceeeceseecsaecsecseeeeeeeaeeneceeeneeeags 3 2 3 1 5 Node to Element
41. teger Matching node element 1 or node node 2 lt mixdof gt integer Mixing of nodes with 3 and 6 dofs l off 2 on lt notsrch gt integer Value telling element class to exclude searching in O means search and 1 means not search 1000 Do not search in beam elements 0100 Do not search in membran lements not implemented 0010 Do not search in shell elements 0001 Do not search in solid elements 1001 Do not search in beam and solid elements a s o lt nrec gt integer Number of records in current command 1 for most commands lt nsel gt integer Number of superelement selected in the scope 0 if lt iscpf1l gt 0 lt skip gt integer 1 Skip optimisation with boundary box search SESAM Submod Program version 3 0 01 NOV 2004 4 7 0 Optimise search in global model with boundary box lt sname gt text 250 Sub model interface file nam lt somedf gt char 5 Not all DOFs in coupl nodes driven TRUE or FALSI El lt lt sprfix gt text 250 Sub model interface file prefix lt supel gt integer Super element type number Submod SESAM 4 8 01 NOV 2004 Program version 3 0 SESAM Submod Program version 3 0 01 NOV 2004 5 1 5 INPUT DESCRIPTION The required input to Submod is specified in SESAM Manager Messages about the execution status from Submod will be displayed on the screen and in the file SUBMOD MLG In this file also more detailed information about the run is printed 5 1
42. transferred through the Input Interface File the T file and the Global model Results Interface File the R file These are parts of the SESAM Interface File system The Input Interface File the T file is a sequential ASCH character file with 80 character long records The straightforward definition of the file enables external programs to be connected to the SESAM system with comparative ease The name of the Input Interface File will be Submod SESAM 2 4 01 NOV 2004 Program version 3 0 prefixT FEM where e prefix is an optional character string that may or may not include a directory specification e T is a mandatory character identifying this as an Input Interface File a T file as opposed to a Loads Interface File L file which uses character L and a Results Interface File R file which uses character R e FP is the superelement number the identifier of the superelement e FEM is a mandatory file extension Normally the user may find it convenient to leave the prefix void This is also the default condition An example of a name of an Input Interface File with prefix is ABCTS FEM SESAM Submod Program version 3 0 01 NOV 2004 3 1 3 USER S GUIDE TO SUBMOD 3 1 Definitions This section defines some of the terminology used in this document 3 1 1 Global Model A global model is a single or multi superelement model whose solution is interpolated onto the boundary of the sub model 3 1 2 Sub Mod
43. ub model which we want to put in the POSTFEM database Instead of using the result file for the global model the T file s from the global model may as well be used The input will then be similar to the input for the sub model The lt sub_ mod nam gt should be the top level superelement of the sub model since this will result in an automatic reading of all superelements in the sub model hierarchy The BUILD command with ALL transformations is later used in POSTFEM to obtain both the global model and the sub model overlapping in the same POSTFEM model In the example below the commands to be specified by the user are given in italic while the leading text in POSTFEM and the explanatory com ments are given in plain text The assembly of the global model in the POSTFEM database is here named R10 and the assembly of the sub model is named T20 1 The different names of the models in POSTFEM are shown when starting up POSTFEM gt BUILD lt new_name gt MODEL OR GO gt R10 assembly of GLOBAL MODEL TRANSFORMATIONS gt ALL MODEL OR GO gt T20 1 assembly of SUB MODEL TRANSFORMATIONS gt ALL MODEL OR GO gt GO gt VIEW MESH The mesh of the global model and the sub model overlapping each other will now be displayed in POST FEM 3 5 Results 3 5 1 Files The Submod program will after a successful run have produced a new set of Input Interface Files T files each representing a superelement on
44. ype Submod 5 4 01 NOV 2004 Global Superelement Scope PURPOSE E Sub modelling SUBMOD Analysis type Global project Specify User defined Matching of nodes Node to Node p Submodel e NodetoElement 5lobaltop superelement P Mix3 and 6 DoF Global Superelement Scope jj Generate input file Coordinate Tolerance Edit input file Run sub modelling Close Figure 5 3 Global Superelement Scope SESAM Program version 3 0 Limit search by scope facility To limit the first level superelements of the global model that can be accessed in order to e Reduce CPU time used in the search for displacements in the global model and increase program response The scope limits all functions in the program that access the scope objects i e the superelements and can therefore be used to guide the program in finding a correct solution faster than if the program worked on the full global model PARAMETERS INCLUDE EXCLUDE OVERWRITE INSERT BEFORE CLEAR Superelement Type The next values are included in the selection The selected data in the list of Global Superelement Scope are removed The specifed Superelement Type and Index are overwriting the selected data Insert the specifed Superelement Type and Index before the se lected data Remove all data from the Global Superelement Scope list First level superelement type in the global model SESAM Submod Program version 3 0 01 NOV 20
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