Noise and Vibration Control of Automotive Body. Automotive Series

  • ID: 4523403
  • Book
  • 520 Pages
  • John Wiley and Sons Ltd
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A comprehensive and versatile treatment of an important and complex topic in vehicle design

Written by an expert in the field with over 30 years of NVH experience, Noise and Vibration Control of Automotive Body offers nine informative chapters on all of the core knowledge required for noise, vibration, and harshness engineers to do their job properly. It starts with an introduction to noise and vibration problems; transfer of structural–borne noise and airborne noise to interior body; key techniques for body noise and vibration control; and noise and vibration control during vehicle development. The book then goes on to cover all the noise and vibration issues relating to the automotive body, including: overall body structure; local body structure; sound package; excitations exerted on the body and transfer functions; wind noise; body sound quality; body squeak and rattle; and the vehicle development process for an automotive body.

Vehicle noise and vibration is one of the most important attributes for modern vehicles, and it is extremely important to understand and solve NVH problems. Noise and Vibration Control of Automotive Body offers comprehensive coverage of automotive body noise and vibration analysis and control, making it an excellent guide for body design engineers and testing engineers.

  • Covers all the noise and vibration issues relating to the automotive body
  • Features a thorough set of tables, illustrations, photographs, and examples
  • Introduces automotive body structure and noise and vibration problems
  • Pulls together the diverse topics of body structure, sound package, sound quality, squeak and rattle, and target setting

Noise and Vibration Control of Automotive Body is a valuable reference for engineers, designers, researchers, and graduate students in the fields of automotive body design and NVH.

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Chapter 1 Introduction

1.1 Automotive Body Structure and Noise and Vibration Problem

1.1.1 Automotive body structure

1.1.2 Noise and vibration problem caused by body frame structure

1.1.3 Noise and vibration problem caused by body panel structure

1.1.4 Interior structure and sound treatment

1.1.5 Noise and vibration problem caused by body accessory parts

1.2 Transfer of Structural–borne Noise and Airborne Noise to Body Interior

1.2.1 Description of Vehicle Noise and Vibration Sources

1.2.2 Structural–borne noise and airborne noise

1.2.3 Transfer of noise and vibration sources to body interior

1.3 Key Techniques for Body Noise and Vibration Control

1.3.1 Vibration and control of overall body structure

1.3.2 Vibration and sound radiation of body local structures

1.3.3 Sound package for vehicle body

1.3.4 Body noise and vibration sensitivity

1.3.5 Wind noise and control

1.3.6 Door closing sound quality and control

1.3.7 Squeak and rattle of vehicle body

1.4 Noise and Vibration Control during Vehicle Development

1.4.1 Modal frequency distribution for vehicle body

1.4.2 Body NVH target system

1.4.3 Execution of body NVH targets

1.5 Structure of This Book

Chapter 2 Vibration Control of Overall Body Structure

2.1 Introduction

2.1.1 Overall body stiffness

2.1.2 Overall body modes

2.1.3 Contents of overall body vibration research

2.2 Overall Body Stiffness

2.2.1 Body bending stiffness

2.2.2 Body torsional stiffness

2.3 Control for Overall Body Stiffness

2.3.1 Overall layout of a body structure

2.3.2 Body frame cross section and stiffness analysis

2.3.3 Joint stiffness

2.3.4 Influence of adhesive bonding stiffness on overall body stiffness

2.3.5 Contribution analysis of beams and joints on overall body stiffness

2.4 Identification of Overall Body Modes

2.4.1 Fundamental of modal analysis

2.4.2 Modal shape and frequency of vehicle body

2.4.3 Modal testing for vehicle body

2.4.4 Calculation of vehicle body modes

2.5 Control of Overall Body Modes

2.5.1 Separation and decoupling of body modes

2.5.2 Planning table/chart of body modes

2.5.3 Control of overall body modes

Chapter 3 Noise and Vibration Control for Body Local Structures

3.1 Noise and Vibration Problems Caused by Vehicle Local Structures

3.1.1 Classification and modes of local body structures

3.1.2 Noise and vibration problems generated by local modes

3.1.3 Control strategy for local modes

3.2 Body Plate Vibration and Sound Radiation

3.2.1 Vibration of plate structure

3.2.2 Sound radiation of plate structure

3.3 Body Acoustic Cavity Modes

3.3.1 Definition and shapes of acoustic cavity modes

3.3.2 Theoretical analysis and measurement of acoustic cavity modes

3.3.3 Coupling of acoustic cavity mode and structural mode

3.3.4 Control of acoustic cavity modes

3.4 Panel Contribution Analysis

3.4.1 Concept of panel contribution

3.4.2 Contribution analysis of panel vibration and sound radiation

3.4.3 Testing methods of panel vibration and sound radiation

3.5 Damping control for structural vibration and sound radiation

3.5.1 Damping phenomenon and description

3.5.2 Damping models

3.5.3 Loss factor

3.5.4 Characteristics of viscoelastic damping materials

3.5.5 Classification of body damping materials and damping structures

3.5.6 Measurement of damping loss factor

3.5.7 Application of damping materials and damping structures on vehicle body

3.6 Stiffness Control for Body Panel Vibration and Sound Radiation

3.6.1 Mechanism of stiffness control

3.6.2 Tuning of plate stiffness

3.6.3 Influence of plate stiffness tuning on sound radiation

3.6.4 Case study of body stiffness tuning

3.7 Mass Control for Body Panel vibration and Sound Radiation

3.7.1 Mechanism of mass control

3.7.2 Application of mass control

3.8 Damper Control for Body Vibration and Sound Radiation

3.8.1 Mechanism of dynamic damper

3.8.2 Application of dynamic damper to attenuate interior booming

3.9 Noise and Vibration for Body Accessory Components

3.9.1 Bracket mode and control

3.9.2 Control of steering system vibration

3.9.3 Control of seat vibration

Chapter 4 Sound Package

4.1 Introduction

4.1.1 Transfer of airborne noise to passenger compartment

4.1.2 Scopes of sound package research

4.2 Body Sealing

4.2.1 Importance of sealing

4.2.2 Static sealing and dynamic sealing

4.2.3 Measurement of static sealing

4.2.4 Control of static sealing

4.3 Sound Absorptive Materials

4.3.1 Sound absorption mechanism and sound absorption coefficient

4.3.2 Porous sound absorptive material

4.3.3 Resonant sound absorption structure

4.3.4 Measurement of sound absorption coefficient

4.4 Sound Insulation Materials and Structures

4.4.1 Mechanism of sound insulation and sound transmission loss

4.4.2 Sound insulation of single plate

4.4.3 Sound insulation of double plate

4.4.4 Measurement of sound insulation materials

4.5 Application of Sound Package

4.5.1 Application of sound absorptive materials and structures

4.5.2 Application of combination of sound insulation structures and sound absorptive materials

4.5.3 Application of sound baffle material

4.6 Statistical Energy Analysis and Its Application

4.6.1 Concept of statistical energy analysis

4.6.2 Theory of statistical energy analysis

4.6.3 Assumption and application of statistical energy analysis

4.6.4 Loss factor

4.6.5 Input power

4.6.6 Application of statistical energy analysis on vehicle body

Chapter 5 Vehicle Body Sensitivity Analysis and Control

5.1 Introduction

5.1.1 System and transfer function

5.1.2 Vibration and sound excitation points on vehicle body

5.1.3 Response points

5.1.4 Body sensitivity

5.2 "Source – Transfer Path – Response" Model for Vehicle Body

5.2.1 "Source – transfer path response" model

5.2.2 "Source transfer path vibration" model for vehicle body

5.2.3 "Source transfer path noise" model for vehicle body

5.3 Characteristics and Analysis of Noise and Vibration Sources

5.3.1 Excitation characteristics of engine and related systems

5.3.2 Excitation characteristics of drivetrain system

5.3.3 Excitation characteristics of tire

5.3.4 Excitation characteristics of rotary machines

5.3.5 Excitation characteristics of random and impulse inputs

5.4 Dynamic Stiffness and Input Point Inertance

5.4.1 Mechanical impedance and mobility

5.4.2 Driving point dynamic stiffness

5.4.3 IPI and driving point dynamic stiffness

5.4.4 Control of driving point dynamic stiffness

5.5 Vibration–Vibration Sensitivity and Sound–Vibration Sensitivity

5.5.1 Transfer processing of vibration sources to interior vibration and vibration–vibration sensitivity

5.5.2 Transfer processing of vibration sources to interior noise and sound–vibration sensitivity

5.5.3 Sensitivity control

5.5.4 Sensitivity targets

5.6 Sound–Sound Sensitivity and Control

5.6.1 Sound transmission from outside body to interior

5.6.2 Expression of sound–sound sensitivity

5.6.3 Targets and control for sound–sound sensitivity

Chapter 6 Wind Noise

6.1 Introduction

6.6.1 Problems induced by wind noise

6.6.2 Sound sources and classification of wind noise

6.2 Mechanism of Wind Noise

6.2.1 Pulsating Noise

6.2.2 Aspiration noise

6.2.3 Buffeting noise

6.2.4 Cavity noise

6.3 Control Strategy for Wind Noise

6.3.1 Transfer paths of wind noise

6.3.2 Control strategy of wind noise

6.4 Body Overall Styling and Wind Noise Control

6.4.1 Ideal body overall styling

6.4.2 Design of transition Region between front grille and engine hood

6.4.3 Design in area between engine hook and front windshield

6.4.4 Design in A pillar area

6.4.5 Design of transition area of roof, rear windshield and trunk lid

6.4.6 Underbody design

6.4.7 Design in area of wheelhouse and body side panel

6.5 Body Local Design and Wind Noise Control

6.5.1 Principles for body local structure design

6.5.2 Design of side mirror and its connection with body

6.5.3 Sunroof design and wind noise control

6.5.4 Antenna design and wind noise control

6.5.5 Design of roof luggage rack

6.5.6 Design of other appendages and outside cavity

6.6 Dynamic Sealing and Control

6.6.1 Dynamic sealing and its importance

6.6.2 Expression for dynamic sealing

6.6.3 Types of dynamic sealing between door and body

6.6.4 Control of Dynamic Sealing

6.7 Measurement and Evaluation of Wind Noise

6.7.1 Wind noise testing in wind tunnel

6.7.2 Wind noise testing on road

6.7.3 Evaluation of wind noise

6.8 Analysis of Wind Noise

6.8.1 Relationship between Aerodynamic acoustics and classic acoustics

6.8.2 Lighthill acoustic analogy theory

6.8.3 Lighthill–Curl acoustic analogy theory

6.8.4 Solution of aerodynamic acoustics

6.8.5 Simulation of wind noise

Chapter 7 Door Closing Sound Quality

7.1 Vehicle Sound Quality

7.1.1 Concept of sound quality

7.1.2 Automotive sound quality

7.1.3 Importance of automotive sound quality

7.1.4 Scope of sound quality

7.2 Evaluation Indexes of Sound Quality

7.2.1 Description of psychoacoustics

7.2.2 Evaluation indexes of psychoacoustics

7.2.3 Critical Band

7.2.4 Loudness

7.2.5 Sharpness

7.2.6 Modulation, Fluctuation and Roughness

7.2.7 Tonality

7.2.8 Articulation Index

7.2.9 Sound masking

7.3 Evaluation Indexes for Automotive Sound Quality

7.3.1 Classification for automotive sound quality

7.3.2 Indexes used to describe automotive sound quality

7.3.3 Indexes used to describe system sound quality

7.4 Evaluation of Door Closing Sound Quality

7.4.1 Importance of door closing sound quality

7.4.2 Subjective evaluation of door closing sound quality

7.4.3 Objective evaluation of door closing sound quality

7.4.4 Relationship between subjective evaluation and objective evaluation

7.5 Control of Door Closing Sound Quality

7.5.1 Structure of door closing system

7.5.2 Noise sources of door closing

7.5.3 Structure control of door closing sound quality

7.6 Design Procedure and Example Analysis for Door Closing Sound Quality

7.6.1 Design procedure for door closing sound quality

7.6.2 Analysis of factors influencing on loudness, sharpness and ring–down

7.6.3 Example analysis of door closing sound quality

7.7 Sound Quality for Other Body Components

Chapter 8 Squeak and Rattle Control of Vehicle Body

8.1 Introduction

8.1.1 What is squeak and rattle?

8.1.2 Components generating squeal and rattle

8.1.3 Importance of squeal and rattle

8.1.4 Mechanism of squeal and rattle

8.1.5 Identification and control of squeal and rattle

8.2 Mechanism and Influence Factors of Squeal and Rattle

8.2.1 Squeak

8.2.2 Rattle

8.3 CAE Analysis of Squeak and Rattle

8.3.1 Analysis of stiffness, mode and deformation of body and door

8.3.2 Modal analysis of body subsystem

8.3.3 Sensitivity analysis of squeak and rattle

8.3.4 Dynamic response analysis of squeak and rattle

8.4 Subjective Evaluation and Testing of Squeak and Rattle

8.4.1 Subjective identification and evaluation of squeak and rattle

8.4.2 Objective testing and analysis of squeak and rattle

8.5 Control of Body Squeak and Rattle

8.5.1 Control strategy of squeak and rattle during vehicle development

8.5.2 Body structure–integrated design and S&R control

8.5.3 DMU checking for body S&R prevention

8.5.4 Matching of material friction pairs

8.5.5 Control of manufacture processes

8.5.6 Squeak and rattle issue for high mileage vehicle

Chapter 9 Targets for Body Noise and Vibration

9.1 Target System for Vehicle Noise and Vibration

9.1.1 Period for vehicle development and targets

9.1.2 Factors influencing on target setting

9.1.3 Principles of target setting and cascading

9.1.4 Principles of mode separation

9.1.5 Target system for body NVH

9.2 NVH Targets for Vehicle–Level Body

9.2.1 Vehicle–level body NVH targets

9.2.2 Vibration targets for vehicle–level body

9.2.3 Noise targets for vehicle–level body

9.3 NVH Targets for Trimmed Body

9.3.1 NVH characteristics of trimmed body

9.3.2 Vibration targets of trimmed body

9.3.3 Noise targets of trimmed body

9.4 NVH Targets for Body–In–White

9.4.1 NVH characteristics of BIW

9.4.2 Vibration targets of BIW

9.4.3 Noise targets of BIW

9.5 NVH Targets for Body Components

9.5.1 Component–level vibration targets

9.5.2 Component–level noise targets

9.5.3 Noise and vibration targets of door

9.6 Execution and Realization of Body Targets

9.6.1 Control at phase of target setting and cascading

9.6.2 Target checking at milestones

9.6.3 CAE analysis and DMU Checking

9.6.4 NVH control for BIW

9.6.5 NVH control for trimmed body and full vehicle

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