Designing quiet structures : a sound power minimization approach / Gary H. Koopmann & John B. Fahnline.

Format:

Book

Author/Creator:

Koopmann, Gary H.

Contributor:

Fahnline, John B.

Language:

English

Subjects (All):

Acoustical engineering.

Absorption of sound.

Physical Description:

1 online resource (261 p.)

Other Title:

Quiet structures

Place of Publication:

San Diego, CA : Academic Press, c1997.

Language Note:

English

Summary:

This book is the first of its kind. It provides the reader with a logical and highly quantitative means of including noise as a parameter in the early design stages of a machine or structure. The unique and unified methodology builds upon the familiar disciplines of acoustics, structural dynamics and optimization. It also exemplifies the art of simplification - the essence of all good engineering design. =Strategies for designing quiet structures require extensive analytical and experimental tools. For computing the sound power from complex structures the authors recommend a new 3-D, lumpe

Contents:

Front Cover; DESIGNING QUIET STRUCTURES: A Sound Power Minimization Approach; Copyright Page; CONTENTS; PREFACE; ACKNOWLEDGMENTS; CHAPTER 1. BASIC EQUATIONS OF ACOUSTICS; 1.1 Derivation of the Wave Equation; 1.2 The Helmholtz Equation for Time-Harmonic Vibrations; 1.3 Boundary Conditions for Acoustic Boundary Value Problems; 1.4 The Time-Averaged Acoustic Power Output of a Vibrating Structure; 1.5 The Inhomogeneous Form of the Helmholtz Equation and Green's Functions; 1.6 The Free-Space Green's Function; 1.7 The Kirchhoff-Helmholtz Equation; 1.8 Sound Radiation from a Very Small Source

ReferencesCHAPTER 2. A LUMPED PARAMETER MODEL FOR THE ACOUSTIC RADIATION PROBLEM; 2.1 Introduction; 2.2 Basic idea of the lumped parameter model; 2.3 Example of a Radially and Transversely Oscillating Sphere; 2.4 Integral Solution for the Acoustic Field of a Vibrating Structure Using the Free-Space Green's Function; 2.5 Integral Solution for the Acoustic Field of a Vibrating Structure Using the Green's Function of the Second Kind; 2.6 Lumped Parameter Model for the Acoustic Field of a Vibrating Structure; 2.7 Lumped Parameter Model for the Acoustic Power Output

2.8 Characterizing the Error in the Lumped Parameter Approximation2.9 Convergence of the Lumped Parameter Model as a Function of Element Size; References; Laboratory Exercise: Radiation From Monopole and Dipole Sources at Low Frequencies; CHAPTER 3. NUMERICAL SOLUTION OF THE ACOUSTIC RADIATION PROBLEM; 3.1 General Methods for Approximately Satisfying the Boundary Condition; 3.2 Conversion of Structural Displacements to Elemental Volume Velocities; 3.3 Radiation from Different Types of Structural Components; 3.4 Implementation of the Volume Velocity Matching Scheme

3.5 Computing Acoustic Power Output3.6 Calculation of the Resistance Matrix; 3.7 Numerical Example Problems; References; Laboratory Exercise: Compiling and Running the Program POWER for an Example Problem; CHAPTER 4. EXPERIMENTAL MEASUREMENT OF THE RESISTANCE MATRIX; 4.1 The Resistance Probe; 4.2 Measurement of the Resistance Matrix; 4.3 Example Problems; References; Laboratory Exercise #1: Calibration of an Acoustic Surface Resistance Probe; Laboratory Exercise # 2: Surface Resistance Measurements on Simple Geometric Shapes

Laboratory Exercise # 3: Comparison of Experimental Predictions to Numerical Calcu- lationsCHAPTER 5. POWER OUTPUT COMPUTATIONS USING THE RESISTANCE MATRIX; 5.1 Frequency Dependence of the Resistance Matrix; 5.2 Radiation Efficiency of Vibrational Mode Shapes; References; Problems; Laboratory Exercise #1: Measurement of the Surface Velocity Profile of a Vibrating Structure; Laboratory Exercise #2: Computation of the Acoustic Power Output; Laboratory Exercise #3: Measurement of the Acoustic Power Output (optional); CHAPTER 6. MINIMIZING SOUND POWER USING MATERIAL TAILORING

6.1 Defining the Objective Function, Design Parameters and Constraints

Notes:

Description based upon print version of record.

Includes bibliographical references and index.

ISBN:

1-281-05384-8

9786611053840

0-08-050404-3

OCLC:

476102772