Duct acoustics fundamentals and applications to mufflers and silencers Erkan Dokumaci, Dokuz Eylül University

Format:

Book

Author/Creator:

Dokumaci, Erkan, 1942- author.

Language:

English

Subjects (All):

Gas tubing--Soundproofing.

Gas tubing.

Air ducts--Acoustic properties--Mathematical models.

Air ducts.

Fluids--Acoustic properties--Mathematical models.

Fluids.

Hydraulic machinery--Noise.

Hydraulic machinery.

Gas-machines--Noise.

Gas-machines.

Acoustical engineering.

Physical Description:

1 online resource

Place of Publication:

Cambridge, United Kingdom New York, NY Cambridge University Press 2021

Summary:

"Using a hands-on approach, this self-contained toolkit covers topics ranging from the foundations of duct acoustics to the acoustic design of these devices, through practical modelling, optimization and measurement techniques. Discover in-depth analyses of one- and three-dimensional models of sound generation, propagation and radiation, as techniques for assembling acoustic models of duct systems from simpler components are described. Identify weaknesses of mathematical models in use and improve them by measurement when needed. Cope with challenges in acoustic design, with in-depth understanding of the underlying physics, by using the tools described. An essential reference for engineers and researchers who work on the acoustics of fluid machinery ductworks"-- Provided by publisher

Contents:

Cover

Half-title

Title page

Copyright information

Dedication

Contents

Preface

1 Some Preliminaries

1.1 Introduction to the Linear Theory of Sound Wave Motion

1.1.1 Linearization Hypothesis

1.1.2 Partitioning Turbulent Fluctuations

1.1.3 Linearization of Inviscid Fluid Flow

1.1.4 Evolution of Non-Linear Waves

1.2 Representation of Acoustic Waves in the Frequency Domain

1.2.1 Fourier Transform

1.2.2 Periodic Functions

1.2.3 Impulse Sampling

1.2.4 Power Spectral Density

1.3 Representation of Waves in the Wavenumber Domain

1.3.1 Spatial Fourier Transform

1.3.2 Briggs' Criterion

1.4 Intensity and Power of Sound Waves

1.5 Introduction to the Linear System View of Duct Acoustics

References

2 Introduction to Acoustic Block Diagrams

2.1 Introduction

2.2 Classification of Acoustic Models of Ducts

2.2.1 Classification by Number of Ports

2.2.2 Classification by Type of Port

2.2.2.1 One-Dimensional Elements

2.2.2.2 Modal Elements

2.3 Mathematical Models of Acoustic Elements

2.3.1 One-Port Elements

2.3.2 Two-Port Elements

2.3.3 Multi-Port Elements

2.4 Assembly of Blocks

2.4.1 Assembly of Two-Ports

2.4.2 Assembly of Multi-Ports

2.4.3 Optimization of Global Matrix Size

2.4.4 Contraction of Assembled Modal Two-Ports

2.5 Acoustic Elements Based on Numerical Methods

2.5.1 The Finite Element Method

2.5.2 The Boundary Element Method

2.6 Programming Considerations

3 Transmission of Low-Frequency Sound Waves in Ducts

3.1 Introduction

3.2 One-Dimensional Theory of Sound Propagation in Ducts

3.2.1 Unsteady Flow Equations

3.2.2 Equations Governing Acoustic Wave Motion

3.3 Solution of Linearized Acoustic Equations

3.8 Acoustic Boundary Conditions on Duct Walls

3.8.1 Impermeable Walls

3.8.1.1 No-Slip Model

3.8.1.2 Full-Slip Model

3.8.1.3 Partial-Slip Model

3.8.1.4 Rough-Wall Model

3.8.1.5 Unified Boundary Condition

3.8.2 Permeable Walls

3.9 Homogeneous Ducts with Impermeable Finite Impedance Walls

3.9.1 Non-Uniform Duct

3.9.2 Uniform Duct

3.9.2.1 Direction of Propagation

3.9.2.2 Wave Equation

3.9.2.3 Impedance Eduction Formula

3.9.2.4 Peripherally Non-Uniform Wall Impedance

3.9.3 Finite Wall Impedance Models

3.9.3.1 Lined Impermeable Walls

Notes:

Includes bibliographical references and index

Online resource; title from digital title page (viewed on May 24, 2021)

Other Format:

Print version Dokumaci, Erkan, 1942- Duct acoustics

ISBN:

9781108887656

1108887651

9781108899628

1108899625

OCLC:

1198988049

Access Restriction:

Restricted for use by site license