Vibration, and Sound Quality

Transcription

1 Vehicle Noise, Vibration, and Sound Quality By Gang Sheng (Gang Sheng Chen) SASInternational Warrendale, Pennsylvania USA

2 Table of Contents Preface ix Chapter 1 Introduction to Vehicle Vibrations and Sound 1 11 Vehicle vibrations and sound Vehicle systems, subsystems, and components Sources, paths, and receivers of vibrations and sound 3 12 Characteristics of vehicle vibrations and sound 3 13 Significance of vehicle vibrations and sound 7 Chapter 2 Fundamentals of Vehicle Vibrations and Sound Introduction Fundamentals of vibration Vibration of linear discrete and continuous systems Random vibrations Fundamentals of sound Airborne sound and measures Sound perception and weighting curves Sound wave equation Sound radiation of structures Acoustic wave transmission, adsorption, and reflection Analysis and testing approaches Finite element and boundary element methods Modal analysis and modal synthesis methods Transfer path analysis Statistical energy analysis Testing techniques 777 V

3 25 Control of vehicle vibrations and sound Basic features of vehicle vibrations and noise Mode mapping and frequency separation of subsystems/components Vibration reduction using isolator and absorber 254 Damping treatment Noise control through insulation Noise control through absorption material or structure Active and semi-active control of noise and vibrations Fundamentals of sound quality 150 Chapter 3 Powertrain Vibrations and Sound Introduction Engine vibrations Engine vibration sources Torsional vibrations Bending vibrations of engine crankshaft Engine noise Introduction Engine noise sources Combustion noise Engine mechanical noise Transmission vibrations and noise Transmission whine Transmission rattle Clutch system vibrations and noise Sound in air intake and exhaust systems Noise in air intake system Sound in air exhaust systems Drivetrain vibrations and noise Driveline system and vibration and noise Run-out, second-order excitation, unbalance, and critical speed of shaft Vibrations and noise in driveline systems Powertrain system vibration isolation Vibration isolation 302 vi

4 372 Isolation evaluation using six-degree-of-freedom model Engine mounts Optimization of powertrain vibration isolation 316 Chapter 4 Vibrations and Sounds of Body and Chassis Systems Introduction Vehicle interior noise: structure-borne noise Vehicle body structural vibration mode and sensitivity, acoustic modes of vehicle compartment Structural vibration, noise, and damping treatment Excitation transmissions of body structure connection points Sources of structure-borne interior noise Vehicle interior noise: airborne noise Sources of airborne noise Powertrain airborne noise Road and tire noise mechanisms Sound treatment of vehicle Wind noise Introduction Wind noise mechanism and testing The analysis of wind noise Wind noise abatement Squeak and rattle Friction- and impact-induced vibrations and noise Squeak and rattle control Brake system vibration and noise Introduction Low-frequency vibration and noise Low-frequency squeal High-frequency squeal Vehicle low-frequency vibrations Introduction 405 vii

5 472 Whole vehicle vibrations at low frequency and ride dynamics Vehicle structure vibrations of low frequency Seat vibrations Steering wheel system vibrations 435 Chapter 5 Evaluation of Vehicle Vibrations and Sound Introduction Noise and sound quality evaluation Pass-by noise: Regulatory requirement Interior noise: customer requirement Sound quality: customer perception Vibration evaluation Body characteristics under vibration environment Discomfort and subjective evaluation Objective evaluation of ride discomfort Linear human body modeling Objective evaluation of seats Vehicle vibration evaluation 479 Index 485 About the Author 493 viii