NVH â Department Vehicle Acoustics Advanced Development NVH ...

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Measurement: PIM (Power Injection Method)Based on exciting each subsystem in turn andmeasuring the responses on all subsystems.# Measuring of responses only from adjacent (coupled) subsystemsStep 1responseStep 2, …C:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerSubsystem 1 Subsystem 2Subsystem 1 Subsystem 2excitationSubsystem 3Subsystem 3AUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com14
Measurement: Signal monitoringC:\ppt\Eggner_LMS_Conference_2006.pptOnline signal monitoring (Quality/ Error Checks):! coherence! excitation spectrum:Author: T. Eggner" bandwidth" amplitude (SNR)! time signal of excitation (impulse hammer: double impact)! imaginary part of inertance (a/F) >= 0coherence10.90.80.70.60.50.40.3N/dB60504030coherence (ex:12101; resp:01010)force spectrum (ex:12101)200.2SNR= 34.1dB (response node:01010) SNR= 10.6dB (response node:09007)10-20-200.1noise0signal0-40-400-1 02000 4000 6000 8000 10000 12000-2 0Hz8000 0 2000 4000 6000 10000 12000-60-60Hz-1402500 2000 4000 6000 8000 10000 12000-1400 6000 8000 10000 12000Hz2000 4000200HzAUTOMOBILENTWICKLUNG / ENGINEERINGSNRimag(a/F)-80-100400350-120300150100500SNR-80-100-120point mobility (ex:12101)-500 2000 4000 6000 8000 10000 12000Hznoisesignalwww.magnasteyr.com15
Page 1 and 2: NVH - DepartmentVehicle AcousticsAd
Page 3 and 4: C:\ppt\Eggner_LMS_Conference_2006.p
Page 5 and 6: Introduction: Experimental SEASEA p
Page 7 and 8: Introduction: Hybrid SEA modelling
Page 9 and 10: Creating an SEA modelFEMMeasurabili
Page 11 and 12: Measurement preparationsC:\ppt\Eggn
Page 13: Measurement: SetupSubsystem types:
Page 19 and 20: Loss factor calculation 2Procedure:
Page 21 and 22: Loss factor integration! MATLAB bas
Page 25 and 26: Advantages/ Disadvantages++ high re

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