Experiment E-4, Wind Speed Measurements
Contents
1. hours for example and take your sensor outside fA Click on the Off line Experiment icon Gas in the NeuLog main icon bar ts Click on the Experiment Setup icon and set the time and duration Put the sensor in a stable place ef AS 47 RA EA a my a t m k Y AA gt To i TA JS ne J CSAT i f Sad y Eg R w 7 o tee oe AS SS EREA A ONT N A FERA i ate Press the sensors start stop button to start the measurement When the measurement is over connect the sensor to the computer using the USB 200 module Click on the Search Sensors icon Q and then click on the A Offline Experiment icon Gass t Click on the Load Experiment icon o Experiment E 4 Wind Velocity Measurements Ver 3 0 4 10 NeuLog EF The menu shows a list of stored experiments in the sensor s memory up to 5 31 Choose the required experiment and click on the Load Experiments button 32 Click on the Zoom fit icon a if needed This is an example of a short experiment conducted during a storm NeuLog Al EA 9 Te gt m Back Experiment Erase Run Stop Setup Experiment Experiment Experiment Experiment 12 15 Time Second Q HJA le es Unzoom Zoom Zoom Select Show Grid Graph Table Point Area All Fit Zone Functions 33 Save your graph Challenge research 34 Repeat the experiment with different distances between the anemometer sensor and the fan Experiment E 4 Wind Velocity2. Wind Velocity Measurements Ver 3 0 4 3 NeuLog EJ Difficult to walk against wind g 34 40 62 74 Gale Mocerately MeO lt aascint small branches blown 46 crests break into spindrift off trees 47 High waves 7 m dense foam Minor structural damage may 2 Wea TOOT 5g HOHE gale visibility affected occur shingles blown off roofs 7 Very high waves 9 m heavy sea 10 48 55 88 102 Storm roll visibility impaired Surface generally white Trees uprooted structural damage likely 103 64 Violent Exceptionally high waves 11 m 11 56 63 118 73 storm visibility poor Widespread damage to structures Severe structural damage to buildings wide spread devastation 14 m waves air filled with foam and Ha p OSE y EAE re uean M evsel bad How can we measure wind speed An anemometer is an instrument with three or four small hemispheres set so they can catch the wind and revolve about a vertical rod The revolutions are recorded and wind speed is calculated in kilometers hour or miles hour In this experiment you will use a fan as a source of wind and simulate different situations from light breeze to moderate breeze You will assess the wind speed category by using the Beaufort scale and then compare this assessment with data obtained through an Anemometer logger sensor During a windy day you could do an off line measurement for a couple of minutes or hours and see the wind velocity changes duri
3. 1 NeuLog EJ Experiment E 4 Wind Speed Measurements Objectives To explore different levels of wind speed To assess the speed of natural or simulated wind by using the Beaufort scale To compare the assessment with the Anemometer logger sensor data Modules and Sensors PC NeuLog application USB 200 module BAT 200 Battery module optional NUL 242 Anemometer logger sensor Equipment and Accessories Utility stand Right angle clamp Extension clamp Fan The items above except for the fan are included in the NeuLog Utility accessories UTL KIT and in the NeuLog Mechanics kit MEC KIT Experiment E 4 Wind Velocity Measurements Ver 3 0 4 2 NeuLog EJ Introduction Wind is the movement of air at any velocity especially a natural movement along the ground It is caused by differences in air pressure within our atmosphere Air under high pressure moves toward areas of low pressure The greater the difference in pressure the faster the air flows The direction of the wind is expressed as the direction from which it is blowing For example easterly winds blow from east to west Sea breezes occur when inland areas heat up on sunny afternoons That warms the air causing it to rise Cooler air rushes in from the ocean to take its place creating wind Land breezes come at night when the inland temperature value is low and the ocean is warmer than the land In this situation cooler air from the land moves t
4. Measurements Ver 3 0 4 11 NeuLog EJ Summary questions 1 What wind speeds did you get when using the fan What wind speed did you get when measuring outdoors 2 Which Beaufort Scale categories are compatible with your results 3 Were you able to assess the wind speed using this scale Experiment E 4 Wind Velocity Measurements Ver 3 0 4
5. ing rate to 10 per second Experiment E 4 Wind Velocity Measurements Ver 3 0 4 7 NeuLog EJ Testing and measurements 11 12 13 14 15 16 17 18 19 Turn on the fan in its lowest intensity leave it on for a while and feel the wind with your hands Look at the Beaufort scale and try to assess the wind speed category Increase the fan s intensity to the next level and try to assess the wind speed category Continue this way for all the fan s intensities Turn off the fan Click on the Run Experiment icon WJ to start the measurement Wait 30 seconds with the fan off Turn on the fan in its lowest intensity leave it on for 30 seconds Increase the fan s intensity to the next level and leave it this way for another 30 seconds Continue this way for all the fan s intensities Experiment E 4 Wind Velocity Measurements Ver 3 0 4 8 NeuLog EF 20 Click on the Zoom fit icon Fel 21 Your graph should be similar to the following NeuLog OG t e D r gt Ps pe A r g Back Experiment Erase Single Run Save Open Setup Experiment Step Experiment Experiment Experiment 0 6 0 8 1 Qalb O Bhce Unzoom Zoom Zoom Select Line Show Grid Graph Table Point Area All Fit Zone Width Functions 22 Save your graph Experiment E 4 Wind Velocity Measurements Ver 3 0 4 23 24 29 26 AE 28 29 30 9 NeuLog EJ lf it is a windy day program an off line measurement of 2
6. ng this period of time Experiment E 4 Wind Velocity Measurements Ver 3 0 4 4 NeuLog EJ Procedure Experiment setup 1 Set up the experiment as shown in the picture below 2 Place the fan on the table and the anemometer in front of It at a distance of approximately 30 cm Experiment E 4 Wind Velocity Measurements Ver 3 0 4 5 NeuLog ES sensor setup 3 Connect the USB 200 module va to the PC 4 Check that the anemometer sensor is connected to the USB 200 module Note The following software functions are explained in short It is recommended to practice the NeuLog application functions as described in the user manual beforehand J Run the NeuLog application and check that the anemometer sensor is identified Settings 6 Click on the On line Experiment icon to in the NeuLog main icon bar 7 Click on the Sensor s Module box 8 Click on the Range button Experiment E 4 Wind Velocity Measurements Ver 3 0 4 NeuLog EF 6 9 select the km h button or the mph button to change the sensor s mode depends on your couniry The sample experiments will be conducted in mph mode pur Q m mw O Ff O i l NeuLog About Search On Line Off Line Vi s Experiment Experiment Mode Tools NeuLog NeuLog Sensors Anemometer id 1 Range mph me 1 4 x Duration 1 minute Rate 50 per second tt 10 Click on the Experiment Setup icon and set the Experiment duration to 2 minutes sampl
7. owards the sea Similar forces produce global wind patterns such as trade winds Wind speed relates to observed conditions at sea or on land The Beaufort scale includes descriptions of these conditions and divides wind speeds into twelve different categories from less than 1 mph or 1 6 Km hour no apparent wind to more than 74 mph or 119 Km hour hurricane The following Beaufort Scale for wind speed was taken from the University of North Carolina s website http www unc edu rowlett units scales beaufort html Speed Conditions Conditions Force Name knots km hr mph at Sea on Land 0 lt 1 lt 2 lt 1 Calm Sea like a mirror Smoke rises vertically 1 1 3 1 5 1 4 Light air Ripples only Smoke drifts and leaves rustle 2 4 6 6 11 5 7 Light Small wavelets 0 2 m Crests have Wind felt on face breeze a glassy appearance 3 7 10 12 19 8 Gentle Large wavelets 0 6 m crests begin Fiag eztended leaves move 11 breeze to break 4 11 16 20 29 re eae Small waves 1 m some whitecaps Dust and small branches move 18 breeze 5 17 21 30 39 Sak ice Morerale yanes Le Tuy mANY Small trees begin to sway 24 breeze whitecaps 25 Stron on Gai probably come Large branches move wires 6 22 27 40 50 aie aa le ee whistle umbrellas are difficult to 31 breeze spray control 7 28 33 51 61 32 Near gale Mounting sea 4 m with foam Whole trees in motion 38 blown in streaks downwind inconvenience in walking Experiment E 4
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