Essentials of vehicle aero-acoustics testing

Transcription

1 Essentials of vehicle aero-acoustics testing Realize innovation.

2 Why? Powertrain noise 10% ICE vehicle 10% Road noise Wind Noise Ancillary system noise 15% Electric Vehicle 10% 15% 50% Other noise and vibration phenomenon 30% 30% 40% Source: Leading the Charge The Future of Electric Vehicle Noise Control, Greg Goetchius, Sound & Vibration, April 2011 Shift engineering efforts to road and wind noise reduction Page 2

3 New investments in aero-acoustic testing Picture: courtesy of Daimler Page 3

4 Evolution towards the next generation aero-acoustic testing Exterior Wind tunnel Testing First generation Second generation Third Generation NOW High Low Cost Return of investment Capture exterior noise Understand how noise leaks in Analyze wind noise at different speed and yaw angle Understand source contribution to interior noise Understand sound distribution around vehicle Understand noise transfer paths Quickly process and compare scenarios Page 4

5 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Combine all into one integrated solution image Get the maximum out of your test campaign Work with a trusted partner Page 5

6 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Combine all into one integrated solution Get maximum out of your test campaign Work with a trusted partner Page 6

7 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior sound source localization S C A L A B L E Exterior source identification Direct exterior measurements Acoustic arrays for source estimation Page 7

8 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior sound source localization S C A L A B L E Exterior source identification Direct exterior measurements Acoustic arrays for source estimation Page 8

9 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior sound source localization S C A L A B L E Exterior source identification Direct exterior measurements Acoustic arrays for source estimation Page 9

10 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior sound source localization S C A L A B L E Exterior source identification Direct exterior measurements Acoustic arrays for source estimation Page 10

11 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior sound source localization S C A L A B L E Exterior source identification Direct exterior measurements Acoustic arrays for source estimation Page 11

12 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Getting maximum out of all used methods by having access to best technology Combine all into one integrated solution Get maximum out of your test campaign Work with a trusted partner Page 12

13 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Combine all into one integrated solution Get maximum out of your test campaign Work with a trusted partner Page 13

14 Overview of aero-acoustic testing technologies Interior wind noise measurements Direct interior measurements Interior Sound Source Localization S C A L A B L E INTEGRATED SOLUTION Exterior source identification Direct Exterior Measurements Acoustic Arrays for Source estimation Page 14

15 Integrated - means that data is measured simultaneously, fully synchronized 3D acoustic camera, binaural heads Left Acoustic arrays Top Right SCADAS Mobile inside vehicle Integration with wind tunnel controller SCADAS Lab SCADAS Mobile underneath turn table Master control integrated with wind tunnel control system Online and offline analysis system Data storage & management Additional microphones Wind tunnel control room Page 15

16 What is the value of an integrated solution? Only one system to learn and operate Integration with wind tunnel controller only needs to be done once Page 16 More efficient to set up BUT there is much more = 3 Annotate and save vehicle attributes, wind speed & Yaw angle automatically for all acquired data

17 Example 1 Compare binaural head and exterior array results Which exterior sources lead to high loudness? LOUDNESS Configuration A- B Time Varying Loudness Vehicle1_Inter_FR:S Blocked 95% 95% perc Time Varying Loudness Vehicle2_Inter_FR:S Free 95% 95% perc Viewing and comparing results from different techniques together on one screen gives additional insight sone Amplitude s Time Configuration blocked underbody Configuration free underbody Page 17

18 Example 2 Link binaural head with exterior array with coherence analysis Which external source is important for driver s left ear? Top array Result Top array result correlated to driver s right ear Coherence analysis allows to focus on sources for interior noise Page 18

19 Example 3 Link 3D Cam and exterior array with coherence analysis Energy flow analysis - Where does an external source leak into the vehicle? Exterior arrays Top array result 3D Camera Overall 3DCam results 3DCam results related to source selected outside Coherence analysis between interior and exterior array allow energy flow analysis Page 19

20 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Getting maximum out of each used methods by having access to best technology Combine all into one integrated solution Getting new insights from combining technologies Increasing efficiency by having only one system Get maximum out of your test campaign Work with a trusted partner Page 20

21 Overview Understand aero-acoustic testing technologies Combine all into one integrated solution Get maximum out of your test campaign Work with a trusted partner Amount of information Efficiency Effectiveness ROI Page 21

22 How in practice does an aero-acoustic testing campaign look like? Test modification of a vehicle Analyze What could cause problems? Yaw Angle Speed [km/h] [degrees] In total often many modifications tested Apply modifications: change mirrors, tape seals, Page 22

23 How to drastically increase testing efficiency? Make tests run automatically & real-time visualization of results Test version/modification of vehicle Allow to view fully processed data in a minute In total often many modifications tested Allow easy selection of what to process & process in batch Allow easy comparison between processed datasets with only few clicks By doing all this, Help drastically reducing number of iterations Thanks to better analysis, apply effective modifications Page 23

24 How to drastically increase testing efficiency? Process and view array results in few seconds Drastic reduction in calculation time thanks to persistent optimizations and move towards GPU First CPU algorithm optimizations Move calculations towards GPU GPU algorithm optimizations Data handling optimization Total Calculation time (hours) Processing ,2 Optimized processing running on GPU Page 24 5 minutes versus10 seconds So what? Calculation times add up!

25 How to drastically increase testing efficiency? Allow easy selection of what to process & process in batch Easy selection of processing to be done: configuration, wind speed, yaw angle, frequency range, method, Each calculation running fast on CPU Calculations running automatically in batch Status color indication Runs as background process continue further analysis Page 25

26 How to drastically increase testing efficiency? Easy comparison between processed datasets with only few clicks Selection of data to be viewed with only few clicks & Easy comparison of results View & compare ANY result Allows to decide what modifications to test next drastically remove total test time or make test more effective Page 26

27 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Getting maximum out of each used methods by having access to best technology Combine all into one integrated solution Getting new insights from combining technologies Increasing efficiency by having only one system Get maximum out of your test campaign Use all functionality ALL the time Be able to use results during test campaign & reduce the number of tested modifications Work with a trusted partner Page 27

28 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Combine all into one integrated solution Get maximum out of your test campaign Work with a trusted partner Page 28

29 You can grow step by step Scalable solution No limit to number of channels, you can extend one day with additional front array on top of nozzle Ready to extend with new technology Page 29

30 Professional project deployment Deployment team Customized solution BUT with local support Experienced expert project team Full project ownership from A-Z Customized arrays Integration with wind tunnel controller Customized testing process Teaming with local Siemens STS during full project Local training & support of the system Page 30

31 Essentials of aero-acoustic testing Understand aero-acoustic testing technologies Getting maximum out of each used methods by having access to best technology Combine all into one integrated solution Getting new insights from combining technologies Increasing efficiency by having only one system Get maximum out of your test campaign Work with a trusted partner Use all functionality at ALL the time Be able to use results during test campaign & reduce the number of tested modification Full portfolio including simulation through Simcenter Full project deployment Continued innovation & research Page 31

32 Conclusion Exterior Wind tunnel Testing First generation Second generation Third Generation NOW High Low Cost Return of investment Technology Integrated solution Efficiency Trusted partner Page 32

33 Thank you! Realize innovation.