Vehicle noise and vibration refinement

WANG, RMIT University, Australia Introduction Objectives and significance of vehicle noise and vibration refinement Scope of vehicle noise and vibration refinement The vehicle develop

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Vehicle noise

and vibration

refinement

Edited by Xu Wang

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Vehicle noise and vibration refinement

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Vehicle noise and vibration refinement

Edited by

Xu Wang

CRC Press Boca Raton Boston New York Washington, DC

WOODHEAD PUBLISHING LIMITED

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Part |

13

1Š

1.6

1.7

2.1

2.3

Contents

Contributor contact details

Preface

Introduction

Rationale and history of vehicle noise and vibration

refinement

X WANG, RMIT University, Australia

Introduction

Objectives and significance of vehicle noise and

vibration refinement

Scope of vehicle noise and vibration refinement

The vehicle development process and vehicle noise

and vibration refinement

Vehicle noise and vibration term definitions

History of motoring and vehicle refinement

References and bibliography

Target setting and benchmarking for vehicle noise

Introduction

Benchmarking of vehicle noise and vibration

Target setting for vehicle noise and vibration

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14

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vi

Part Il

3.9

3.10

3.11

3.12

41

42

43

44

45

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48

49

4.10

411

31

5.2

5.3

54

35

Contents

Measurement and modelling

Vehicle vibration measurement and analysis

Introduction

Hand sensing

Basic vibration measurements

ration response investigation and vibration testing

Environmental testing

Mounting the test object

Measuring the complex elastic modulus

Quoting vibration levels

Vibration isolation

The vibration absorber

Case studies

Bibliography

Vehicle noise measurement and analysis

Introduction

Sound fundamentals

Vehicle noise

Measuring microphones

Measuring amplifiers

Calibration

Background noise

Recording sound

Analysis and presentation of noise data

Artificial head technology and psychoacoustics

Bibliography

Random signal processing and spectrum analysis

in vehicle noise and vibration refinement

Random data and process

Correlation analysis

Fourier series

Spectral density analysis

Relationship between correlation functions and spectral

density functions

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67

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78

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102

106 109

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57

5.9

5.10

6.1

6.2

6.3

64

6.5

6.6

71

73

74

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T4

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79

7.10

8.1

8.2

8.3

Contents Weighting functions

Relationship between complex frequency response and

impulsive response

Frequency response functions

Bibliography

Theory and application of modal analysis in vehicle

noise and vibration refinement

M Kronast, Ford-Werke GmbH, Germany

Introduction

Application of modal analysis in vehicle development

Theory of modal analysis

Methods for performing modal analysis

Limitations and trends

References

Mid- and high-frequency problems in vehicle noise

and vibration refinement — statistical energy analysis and wave approaches

Introduction

Modal approach

Energy sharing between two oscillators

Energy exchange in multi-degree-of-freedom systems

Wave approach to statistical energy analysis (SEA)

Procedures of the statistical energy analysis approach

Evaluation of the statistical energy analysis subsystem

parameters

Hybrid deterministic and the statistical energy analysis

approach

Application example

References

Advanced simulation techniques in vehicle noise

N HAMPL, Ford-Werke GmbH, Germany

Introduction

Basic simulation techniques

Frequency or time-domain methods

vii

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114

115

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118

122

128

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142

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viii

8.5

91

9.2

9.3

94

9.9

Part Il

10

10.1

10.2

10.3

10.4

10.5

10.6

10.7

10.8

11

Contents

Application of virtual reality for vehicle noise and

vibration refinement

Conclusions

Sources of further information and advice

References

Advanced experimental techniques in vehicle noise

T AHLERSMEYER, Ford-Werke GmbH, Germany

Transfer path analysis technique

Sound intensity technique for source identification

Acoustic camera: beamforming and nearfield acoustic

holography techniques for source diagnostics

Laser techniques for dynamic analysis and source

identification

Sound quality and psychoacoustics: measurement and

analysis

Ultrasound diagnostic techniques

Advanced material testing techniques

Advanced tachometer reference tracking techniques

References

Noise and vibration refinement in vehicle systems

Aerodynamic noise and its refinement in vehicles

S WATKINS, RMIT University, Australia

The importance of aerodynamic noise

Aerodynamic noise sources: background

Modelling, relevant theory and the possibilities of

simulation

Causes of hydrodynamic pressure fluctuations and

their reduction

Aeroacoustic measurement techniques and

psychoacoustic analysis

Conclusions

Acknowledgements

References

Active noise and vibration control in vehicles

S J ELLiort, University of Southampton, UK

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234 235

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115

11.6

117

12

121

12.2

12.3

12.4

12.5

12.6

12.7

13

13.1

13.2

13.3

13.4

13.5

13.6

13.7

13.8

13.9

14

14.1

14.2

14.3

14.4

14.5

14.6

Contents Control strategies

Commercial systems

Future trends

Sources of further information and advice

References

Noise and vibration refinement of powertrain

systems in vehicles

D.C BAILLIE, General Motors Holden Ltd, Australia

Introduction

Principles and methods

Powertrain noise sources and paths

Enablers and applications

Future trends

Conclusions

References

Vehicle interior noise refinement — cabin sound

package design and development

D ViG£, Centro Ricerche Fiat, Italy

Introduction

Internal noise sources in a vehicle

Vehicle noise paths

Basic principles

Sound package solutions to reduce the interior noise

Simulation methodologies for interior noise

Target setting and deployment on vehicle subsystems

Conclusions

References

Noise and vibration refinement of chassis

and suspension

B ReFr, Ford-Werke GmbH, Germany

Introduction

Road-induced noise, vibration and harshness (NVH) basic requirements and targets

Foundations of road-induced noise, vibration and harshness The tyre: the most complex component?

Suspension

Mounts and bushes — the art of isolation

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14./

14.8 Future trends References

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