MAREA – Maritime Environment Monitoring System
Contents
1. MAREA software Diagnostic Tab Figure 8 is used for all the application settings possible Parameters such as COM port settings sampling rates alarm levels etc can be changed here for each instrument or peripheral used If a COM LOSS or READ ERROR alarm is shown for a value in the Main Tab the error can here be diagnosed easily since original messages and CRC statuses are shown here In case of an instrument permanent malfunction the instrument can be turned off at will which disables logging of associated values and warning messages This option was implemented in case of need for crane work whilst an instrument needs replacement This way associated values are grayed out on the Main Tab while lack of according COMM LOSS and READ ERROR warning reduces annoyance Main Logging Diagnostic Help MAREA Marine Enviroment Application BRODARSKI INSTITUT EXIT COM port Anemometer Anemometer are Accelerome ter a COM port Accelerometer baud rate Accelerometer baud rate Anemometer k COMI E 38400 v comz 9600 T A Mo an 999 ac 0 0O T wv O XYZ gain XYZ offset Temp gain Temp offset read buffer Wav Buoy 2227 57 32767 5 1546 126 21845 EVH 2 fso Set time step ms a z EET a sat Identificated unit code checksum 1E a 101 Measured time step ms Q o Yom od_ YeH oM o5 o3U unit name Log base path Was in buffer Peres RESET TO DEFAULT 0 status Checksum ol TDA Read message rema2. accelerometer box battery level e disk space GB shows available disk space of the drive where values are being logged According to the disk free space change logging remaining time is being estimated every 30 minutes The crane cabin display is an antireflective display since almost all sides of the cabin are transparent Therefore all important values and color changes in the Main Tab are shown as clearly as can be to minimize the crane operator s time needed to understand what is displayed B Logging Tab Main Logging Diagnostic Help MAREA Marine Enviroment Application BRODARSKI INSTITUT EXIT S n w 1 i 127 a m _ I nD Ow eee eee eee ee ee i 22 oe HM oO 1 Force X m s 2 Wind speed m gee 8g A a a TS Mf TT WS WE TA a PALA Ac a 10 20 30 40 50 60 70 80 90 100 1 Sample Sample Sy ACTER VoL SUSI TELL TEE STL SL LL Te mw e n is a a eee 30 40 50 60 70 80 9 100 l Sample Sample El S Ea ET pp ae ag so ap ey S e e E a e 2 Ss 9 10 it f2 13 14 15 16 i 16 19 Sample Sample al E E E 30 40 50 60 70 80 90 100 110 118 pl Figure 7 MAREA Logging Tab Logging Tab Figure 7 displays trends of all critical environmental values since the last MAREA software activation This tab is used mainly for recent red alarm state back monitoring An alarm state is much more understandable when the values trend is available C Diagnostic Tab
3. s 2 06 1 05 2 11 ams Estimated remaining log time at ns Months Days Hours Minutes 637 ef al el 2 ACC TEMP C BATTERY V 16 20 12 07 Figure 6 MAREA Main Tab Background color of mentioned values is dependant of the displayed value If a certain value surpasses the yellow or red alarm level the background changes color accordingly If a red alarm is reached an SMS message is sent to all predefined cell phone numbers automatically and a confirmation status message is shown afterwards Also a warning dialog box is shown with a warning sound in case of a red alarm of any value which awaits operator s confirmation This way it is assured that no environmental critical situation passed unnoticed Displayed values change at a rate dependant on the sensor to which they apply Anemometer values are sampled at 1 Hz rate wave measurement buoy values are sampled at a rate of 1 2 Hz except for significant wave height Hm and significant wave period 7i which are calculated every cca 30 minutes Accelerometer values are sampled and logged at a rate of 20 Hz but only maximum values are displayed in every 1 s timeframe This way the three accelerations are much easier to follow for the operator There are several less significant yet important values also shown on the Main tab of MAREA software e Maximum wave height Hmax m and its associated period T Hmax s e accelerometer temperature C e battery level V
4. MAREA Maritime Environment Monitoring System Marin Stipanov Zdravko Eskinja Dra an Skelin Brodarski Institut d o o Zagreb Croatia marin stipanov hrbi hr Abstract This paper contains a description of the MAREA maritime environment monitoring system and its installation on barge based crane The main purpose of this system is to monitor log detect and alarm critical crane work conditions considering wind direction and speed wave direction and height and three dimensional accelerations of the crane boom Keywords MAREA sea crane barge enviroment wireless data acquisition acceleration I INTRODUCTION MAREA maritime environment monitoring system was designed and developed with the purpose to monitor and log work condition for special maritime objects In this case the system was installed on a barge based crane The crane was originally built for ground work where dynamic effects are minimal Installing such a crane on a barge gave this crane the ability of maritime work thus widening its field of work and making it much more cost effective For this crane to be useful and safe for maritime work the MAREA maritime environment monitoring system was installed with a purpose of monitoring logging detecting and alarming critical work conditions II BARGE BASED CRANE DESCRIPTION Technical details of the mentioned self powered crawler crane 1 are e boom length 97 5 m e mast height 42 7 m e maximum
5. adings could not be accessed without the relay station on the crane cabin In this configuration all the used antennas are very directional and therefore of high gain except for one omni directional antenna used to relay data from the cabin to the control station It had to be omni directional to give coverage in all crane s possible orientations Another set of WLAN equipment was used to transmit the MAREA software display to the crane cabin display This separate WLAN was not necessary but it was the best way to prevent digital image transmission with high baud rate needs to cause measurement data delays or loss C Sea Figure 5 Wave measurement buoy Wave measurement is done Figure 5 by a high precision wave measurement buoy 6 The only sensor used to measure waves is a built in GPS system that measures vertical movement via GPS signal phase difference Technical characteristics are as follows e wave height accuracy free floating 1 2 cm e wave height accuracy anchored 1 2 cm 0 5 e calibration need never e wave period 1 6 100s e 6wave height resolution 1 cm e wave height measurement span 20 20 m e measurement data wave direction NE wave height and period e wave direction resolution 1 5 The wave measurement buoy is deployed anchored near the crane work site and the data is transmitted via VHF RX D2 protocol to the control station The buoy is also equipped with a GSM modu
6. anemometer Figure 3 is a digital anemometer with a RS 232 interface It has a wind speed range of 0 60 m s with 2 tolerance and 0 01 m s resolution B Crane Photovoltaic panels are used for powering the instrumentation on the tip of the boom accelerometer GPS wireless modules To ensure constant power the power system was designed with adequate redundancy and the three 12V 12Ah batteries together with the three 55 W photovoltaic panels were installed on strategic locations on the tip of the crane boom to ensure enough sunlight in all possible crane positions This power system is located in the accelerometer box Figure 4 3D Digital Accelerometer Boom tip accelerations are measured by an RS 485 interface 3D digital accelerometer Figure 4 with a measurement span of 2 g on all three axes A built in temperature sensor is used for temperature change measurement compensation The accelerometer 5 working temperature span is 40 C to 80 C Measured accelerations are sent via a WLAN converter WiPort along the boom to the crane cabin relay station where the measurements are relayed to the control station located behind the crane This wireless communication set up was the optimum configuration where signal loss is minimal in all working conditions The greatest problem was the boom tip possible height and distance in relation to the control station Since no wireless antenna can give spherical coverage the boom tip re
7. ining string COM port BATTERY baud rate BATTERY Max time inerval min Wind heading 1 2 4cOM4 H 9600 my 60 j j 80 AL Wind 1 m s 7 00 j Current read data Min BATT Level V AL Wind 2 m s J 10 00 J 12 00 hnis Q Q Q T_read C 0 08 valid looo o0 W speed m s it Wind_BG_col Useful read data BATT VOLTAGE V Last BATT reading Read data by channel X_read Filtered x 0 00 00 00 00 000 J 0 Wsza12 jo 0 00 DD MM YYYY m Y_read Filtered Y COM port GSM peers J io 0 00 10932 fo COM10 g 19200 ny frBuoy address rfBuoy Port Bo AL Way 1 m X i Zread Filtered Z Min send interval min T localhost J 3001 0 80 492 0 0 00 f GSM init OK diisi Hm_BG_col H2 AL Wav 2 m ALX 1 m s2 ALY 1 m s2 AL Z 1 m s2 Laat Q Q Q Q j 1 30 7 ry r dAfo so Yo 10 10 50 a J Hm_ m ALX2 mjs2 ALY 2 mjs2 AL Z 2 m s2 EEA s y r ervice Centre Joo Joz Joo z Ti_ s a Destination Phone Numbers o x_BG_col _BG_col 2_BG_col J 385981778662 free Hi aT Max every s 385993102119 0 10 Sample length 385915691693 f Last SMS time T Hmax _ s 385981778662 00 00 00 000 fl l3 Sample number 385981778662 vi IDD MM YYYY v Figure 8 MAREA Diagnostic Tab Since alarm values and critical instrument parameters can be changed here the Diagnostic Tab is not intended for operator use and therefore its access is password protected In case of a change in operational parameters or alarm leve
8. le to send warning messages via SMS in case it detects it s moved more than 50 meters from the desired location The GSM module is also used to send measurement data via GPRS in an alternate configuration D Land MAREA system is equipped with a GSM module so alarms could be sent via SMS to authorized personnel If any of monitored values exceeds a predefined maximum an SMS containing exact time and all critical values is sent IV MAREA SOFTWARE DESCRIPTION MAREA system software was developed in the National Instruments LabView programming language due to its high accountability for real time applications and ease of code maintenance MAREA system software is designed for real time sensory data acquisition logging display and critical environment situation detection The graphic user interface GUI is designed to be as user friendly as possible which means that it is easily understandable and usable by personnel with almost no computer knowledge The GUI is generally divided in these three sections A Main Tab MAREA Main tab Figure 6 displays current sensory data in real time Values critical for work environment are e boom tip accelerations o X m s o Y m s o Z m s e wind direction and speed m s e significant wave height Hm m Main Logging Diagnostic Help MAREA Marine Enviroment Application BRODARSKI INSTITUT 0 5 0 0 5 1 Hm m Ti s Hmax m T Hmax
9. ls all relevant changes are made by adequate personnel or software manufacturer This was made to allow changes only to personnel responsible for the MAREA system measurement accuracy V CONCLUSION MAREA maritime environment monitoring system was designed built and applied by experienced engineers of Brodarski Institut The system was designed for long time use in harsh offshore environment and reduces any need for maintenance as much as possible Presented dedicated software was developed in a user friendly manner and offers complete real time system surveillance REFERENCES 1 Manitowoc Cranes Inc Manitowoc 18000 Service Manual September 2008 2 Brodarski Institut General Arrangement Crane based barge 2009 3 Brodarski Institut Offshore Manual Crane based barge 2010 4 Gill Instruments Ltd Wind Sonic GPA Manual March 2008 5 Summit Instruments Inc 35201A User Manual August 2008 6 Datawell BV DWR G User Manual July 2008
10. on top of the control station approximately 10m above sea level and wave height and direction is measured by a wave measuring buoy that is deployed near the work site m CRANE x BOOM BOOM Accelerometer Wireless box box CABIN Wireless box CONTROL STATION jii f We CALE LLLE LARL L LALA LALA GSM phone Figure 2 MAREA system installation chart Wireless data transmission was imperative in this application because installing a cable along the boom was not an option Therefore a problem emerged due to the crane extreme height and large work area Figure 2 shows how the system is divided in four different sections e Control station e Crane e Sea e Land A Control station Main purpose of the control station is overall data acquisition logging and display The control station consists of an Industrial Personal Computer IPC to which all the data is sent by sensory elements The data is displayed on the screen and adequate alarms are shown when a monitored value reaches a predefined maximum allowed value For the values to be visible to the actual crane operator in real time the same display is broadcasted over a Wireless Local Area Network WLAN to a screen in the crane operator cabin Wind speed is measured by an ultrasonic 2D anemometer 4 installed on the control station Figure 3 Ultrasonic anemometer The ultrasonic 2D
11. payload 251 4 tons e operational radius 76 m e maximum allowed counterweight 390 tons e maximum wind speed 10 m s This crane was installed on a barge Figure 1 which serves as an offshore work station as well as a towed platform The barge specifications 2 are as follows e length width height 78 5 m 31 0 m 4 50 m e draught 2 30 2 80 m e class HRB S50A1 barge with crane on deck The barge is a closed type barge with structural reinforcements of the deck in the crane area The barge is also equipped with diesel tanks and ballast tanks for automated pitch and roll compensation N i rp Pn sa m 3 i 7 i a ik A yi Ma are aren ON SY 2e by Senne Is W o 4 ne r Figure 1 Barge based crane layout HI MAREA SYSTEM INSTALLATION MAREA maritime environment monitoring system in this application was designed to monitor the following vital environmental values 3 e wind speed Vy at 10m above sea level maximum allowed 10 m s e significant wave height H maximum allowed 1 3 m e boom accelerations o boom alongside acceleration ay maximum allowed 1 0 m s o boom transverse horizontal acceleration ay 2 maximum allowed 0 2 m s o boom transverse vertical acceleration az 2 maximum allowed 1 0 m s Inertial accelerations are measured by a 3D digital accelerometer on the tip of the boom Wind speed is measured by an ultrasonic 2D anemometer
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