Today's automotive consumer demands high standards of NVH (Noise, Vibration and Harshness) performance. Refinement is one of the main engineering and design attributes addressed in the course of developing new vehicle models and vehicle components. Written for engineering practitioners and engineering students, this book will help readers to understand and develop quieter, more comfortable cars. With chapters on the fundamentals of acoustics and detailed coverage of practical engineering solutions for noise control issues, this book is suitable even for those without an acoustics background, and will be an important reference for practicing engineers in the automotive industry.
Product Features
Comprehensive coverage on the fundamentals of acoustics and the refinement of noise and vibration in automobiles Practical tips and engineering solutions for noise and vibration control issues Based on real-world experience with many leading automotive companies
Author(s): Matthew Harrison
Publisher: SAE
Year: 2004
Language: English
Commentary: 79583
Pages: 358
Cover......Page 1
Contents......Page 8
Acknowledgements......Page 10
Preface......Page 11
About the author......Page 13
Introduction and definitions......Page 14
Scope of this book......Page 15
The purpose of vehicle refinement......Page 16
How refinement can be achieved in the automotive industry......Page 18
The history of vehicle refinement: one representative 20-year example......Page 19
Refinement targets......Page 22
References......Page 28
How sound is created and how it propagates......Page 30
Making basic noise measurements: the sound level meter, recording sound......Page 46
Making basic noise measurements: the decibel scale, frequency and time weightings......Page 56
Analysis and presentation of noise data......Page 61
Sound power level, sound intensity level, sound pressure level......Page 72
References......Page 83
Introduction to logarithms......Page 85
Pass-by noise homologation......Page 87
Noise source ranking......Page 94
Air intake systems and exhaust systems: performance and noise effects......Page 97
Tyre noise......Page 149
References......Page 153
Valve and port geometry......Page 157
Subjective and objective methods of assessment......Page 158
Noise path analysis......Page 164
Measuring the sound power of IC engines and other vehicle noise sources......Page 172
Engine noise......Page 186
Road noise......Page 192
A note on aerodynamic (wind) noise......Page 194
A note on brake noise......Page 195
A note on squeak, rattle and tizz noises......Page 196
Control of sound through absorption within porous materials......Page 197
Control of sound by minimising transmission through panels......Page 207
References......Page 224
Some background information on systems......Page 228
The convolution integral......Page 230
The covariance function, correlation and coherence......Page 233
The frequency response function......Page 238
Plane waves in a tube with a termination impedance......Page 240
The derivation of the linearised mass conservation equation......Page 244
The derivation of the non-linear (and linearised) inviscid Euler equation......Page 246
Making basic vibration measurements......Page 247
Laser-based vibration measurements......Page 251
Analysis and presentation of vibration data: quantifying vibration......Page 253
Modes of vibration and resonance......Page 261
Modal analysis......Page 277
References......Page 281
Damping of vibrations......Page 282
Vibration isolation and absorption......Page 300
Engine and drivetrain vibrations......Page 312
Vehicle and chassis vibrations: ride quality......Page 347
References......Page 351
Index......Page 354
