Essentials of vehicle aero-acoustics testing Unrestricted ... · Exterior Wind tunnel Testing...

Essentials of vehicleaero-acoustics testing

Realize innovation.Unrestricted © Siemens AG 2017

Unrestricted © Siemens AG 2017Page 2 Siemens PLM Software

Why?

50%

30%

10%10%

ICE vehicle

15%

40%30%

15%10%

Electric Vehicle

Powertrain noise

Road noise

Wind Noise

Ancillary system noise

Other noise and vibrationphenomenon

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


New investments in aero-acoustic testing

Picture: courtesy of Daimler


Exterior Wind tunnel Testing

Evolution towards the next generation aero-acoustic testing

First generation Second generation Third Generation NOW

High

Low

CostReturn of investment

Understandhow noise

leaks in

Analyzewind noiseat differentspeed andyaw angle

Understandnoise

transferpaths

Understandsound

distributionaround vehicle

Understandsource

contributionto interior

noise

Quicklyprocess

andcomparescenarios

Captureexteriornoise


Essentials of aero-acoustic testing

image

Work with a trustedpartner

Get the maximum out ofyour test campaign

Combine all into oneintegrated solution

Understand aero-acoustictesting technologies




Get maximum out of yourtest campaign




Overview of aero-acoustic testing technologies

Exterior source identificationInterior wind noise measurements SCALABLE

Direct exterior measurements

Acoustic arrays for source estimation

Direct interior measurements

Interior sound source localization


















Direct exterior measurementsDirect interior measurements

Interior sound source localization Acoustic arrays for source estimation










Getting maximum out of all used methods by havingaccess to best technology














Direct Exterior Measurements

Acoustic Arrays for Source estimation


Interior Sound Source Localization

INTEGRATEDSOLUTION


Integrated -means that data is measured simultaneously, fully synchronized

Acoustic arraysLeft RightTop

3D acoustic camera,binaural heads

Additional microphones

SCADAS Mobile inside vehicle

SCADAS Mobile underneath turn table

SCADAS Lab

Wind tunnel control room

Online andoffline analysis

system

Master control –integrated with wind

tunnel control system

Integration withwind tunnelcontroller

Data storage & management


What is the value of an integrated solution?

Only one system to learnand operate

BUT there is muchmore

1 + 1 = 3

Annotate and save vehicleattributes, wind speed & Yaw

angle automatically for allacquired data

More efficient to setup

Integration with windtunnel controller only

needs to be done once


Example 1Compare binaural head and exterior array results

LOUDNESSConfiguration A- B

25.000.00 sTime

20.00

0.00

Ampl

itude

sone

Time Varying Loudness Vehicle1_Inter_FR:S 95% percentile: 15.5 soneTime Varying Loudness Vehicle2_Inter_FR:S 95% percentile: 13.9 sone

25.000.00 sTime

20.00

0.00

Ampl

itude

sone

Time Varying Loudness Vehicle1_Inter_FR:S 95% percentile: 15.5 soneTime Varying Loudness Vehicle2_Inter_FR:S 95% percentile: 13.9 sone

Configuration blocked underbody Configuration free underbody

BlockedFree

Viewing andcomparing results

from differenttechniques togetheron one screen gives

additional insight

Which exterior sources lead to high loudness?


Example 2Link binaural head with exterior array with coherence analysis

Coherence analysisallows to focus onsources for interior

noise

Which external source is important for driver’s left ear?

Top array ResultTop array result correlated to

driver’s right ear


Example 3Link 3D Cam and exterior array with coherence analysis

Coherence analysisbetween interior andexterior array allowenergy flow analysis

Energy flow analysis - Where does an external source leak into the vehicle?

Overall 3DCam results

Top array result

3DCam results related to sourceselected outside

Exterior arrays

3D Camera



Getting new insights from combining technologiesIncreasing efficiency by having only one system

Getting maximum out of each used methods by havingaccess to best technology






Overview





Am

ount

ofin

form

atio

nE

ffici

ency

Effe

ctiv

enes

sR

OI


How in practice does an aero-acoustic testing campaign look like?

Speed [km/h]Yaw Angle[degrees]

100 -15100 -10100 …100 15120 -20120 …… …

160 20

Test modification of a vehicle AnalyzeWhat could cause problems?

Apply modifications: changemirrors, tape seals, …

In total often manymodifications tested


How to drastically increase testing efficiency?

Make tests runautomatically & real-timevisualization of results

Allow to view fullyprocessed data in a

minute

In total often manymodifications tested

Allow easy comparisonbetween processed

datasets with only fewclicks

By doing all this,Help drastically reducing

number of iterations

Thanks to better analysis,apply effectivemodifications

Test version/modification ofvehicle

Allow easy selection ofwhat to process &process in batch


How to drastically increase testing efficiency?Process and view array results in few seconds

First CPUalgorithm

optimizations

Movecalculations

towards GPU

GPU algorithmoptimizations

Data handlingoptimization

Drastic reduction in calculation time thanks to persistent optimizations and move towards GPU

22

1,2

0

5

10

15

20

25

Processing 2012 Optimized processing running on GPU

Total Calculation time (hours)

5 minutes versus10 seconds … So what?Calculation times add up!


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 runningfast on CPU

Calculations runningautomatically in batch

Status color indication

Runs as backgroundprocess – continuefurther analysis


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 ANYresult

Allows to decide whatmodifications to test next

drastically remove totaltest time or make testmore effective



Use all functionality ALL the timeBe able to use results during test campaign & reduce thenumber of tested modifications














You can grow step by step

Scalable solution

No limit to number of channels,you can extend one day withadditional front array on top ofnozzle

Ready to extend with newtechnology


Professional project deployment

• Experienced expert projectteam

• Full project ownership fromA-Z

• Teaming with local SiemensSTS during full project

• Local training & support ofthe system

• Customized arrays

• Integration with wind tunnelcontroller

• Customized testing process

Deployment team Customized solution BUT with local support



Full portfolio including simulation through SimcenterFull project deploymentContinued innovation & research

Use all functionality at ALL the timeBe able to use results during test campaign & reduce thenumber of tested modification








Conclusion

Exterior Wind tunnel TestingFirst generation Second generation Third Generation NOW

High

Low

CostReturn of investment

Technology Integrated solution Efficiency Trusted partner

Realize innovation.

Thank you!www.siemens.com/plm

http://www.siemens.com/plm

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Essentials of vehicle aero-acoustics testing Unrestricted ... · Exterior Wind tunnel Testing...

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