Designing quiet structures : a sound power minimization approach
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...
Saved in:
| Main Authors | , |
|---|---|
| Format | eBook Book |
| Language | English |
| Published |
San Diego ; Tokyo
Academic Press
1997
Elsevier Science & Technology |
| Edition | 1 |
| Subjects | |
| Online Access | Get full text |
| ISBN | 0124192459 9780124192454 |
Cover
Table of 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 -- References -- CHAPTER 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 Approximation -- 2.9 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 Output
- 3.6 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- lations -- CHAPTER 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 -- 6.2 Analytical Sensitivities for Optimization -- 6.3 Reduction in the Sound Power of a Simply Supported, Baffled Beam Using Masses -- 6.4 Reducing the Radiation Efficiency of the Structural Resonances of a Plate -- References -- Problems -- Laboratory Exercise #1: Reducing the Radiation Efficiency of a Structural Resonance of a Plate -- CHAPTER 7. ACTIVE CONTROL OF RADIATED ACOUSTIC POWER -- 7.1 Optimum Solution for the Control Source Amplitudes -- 7.2 Numerical Example Problems -- 7.3 Elemental Volume Velocity Control -- 7.4 More Realistic Simulation of Active Control -- References -- Problems
- Laboratory Exercise #1: Optimization Techniques for Reducing Acoustic Sound Power Via Active Control -- CHAPTER 8. CHARACTERIZING AND CONTROLLING SOUND IN AN ENCLOSURE -- 8.1 Calculating the Acoustic Potential Energy in an Enclosure -- 8.2 Rewriting the Potential Energy in Terms of Elemental Volume Velocities -- 8.3 Actively Controlling the Acoustic Potential Energy in an Enclosure -- 8.4 Numerical Example Problem -- References -- Problems -- Laboratory Exercise #1: Numerical Simulation of Active Control in an Enclosure -- Laboratory Exercise #2: Experimental Validation of the Predicted Reductions in the Potential Energy -- APPENDIX USING THE COMPUTER PROGRAMS -- A. 1 Input to the Program VV -- A.2 Output from the Program VV -- A.3 Input to the Program POWER -- A.4 Output from the Program POWER -- A.5 Discussion of the Computer Program POWER -- References -- INDEX -- WARNING