
Foundations of Engineering Acoustics.
Title:
Foundations of Engineering Acoustics.
Author:
Fahy, Frank J.
ISBN:
9780080506838
Personal Author:
Edition:
1st ed.
Physical Description:
1 online resource (465 pages)
Contents:
Front Cover -- Foundations of Engineering Acoustics -- Copyright Page -- Contents -- Preface -- Acknowledgements -- Chapter 1. Sound Engineering -- 1.1 The importance of sound -- 1.2 Acoustics and the engineer -- 1.3 Sound the servant -- Chapter 2. The Nature of Sound and Some Sound Wave Phenomena -- 2.1 Introduction -- 2.2 What is sound? -- 2.3 Sound and vibration -- 2.4 Sound in solids -- 2.5 A qualitative introduction to wave phenomena -- 2.6 Some more common examples of the behaviour of sound waves -- Chapter 3. Sound in Fluids -- 3.1 Introduction -- 3.2 The physical characteristics of fluids -- 3.3 Molecules and particles -- 3.4 Fluid pressure -- 3.5 Fluid temperature -- 3.6 Pressure, density and temperature in sound waves in a gas -- 3.7 Particle motion -- 3.8 Sound in liquids -- 3.9 Mathematical models of sound waves -- Chapter 4. Impedance -- 4.1 Introduction -- 4.2 Some simple examples of the utility of impedance -- 4.3 Mechanical impedance -- 4.4 Forms of acoustic impedance -- 4.5 An application of radiation impedance of a uniformly pulsating sphere -- 4.6 Radiation efficiency -- Chapter 5. Sound Energy and Intensity -- 5.1 The practical importance of sound energy -- 5.2 Sound energy -- 5.3 Transport of sound energy: sound intensity -- 5.4 Sound intensity in plane wave fields -- 5.5 Intensity and mean square pressure -- 5.6 Examples of ideal sound intensity fields -- 5.7 Sound intensity measurement -- 5.8 Determination of source sound power using sound intensity measurement -- 5.9 Other applications of sound intensity measurement -- Chapter 6. Sources of Sound -- 6.1 Introduction -- 6.2 Qualitative categorization of sources -- 6.3 The inhomogeneous wave equation -- 6.4 Ideal elementary source models -- 6.5 Sound radiation from vibrating plane surfaces -- 6.6 The vibrating circular piston and the cone loudspeaker.
6.7 Directivity and sound power of distributed sources -- 6.8 Zones of a sound field radiated by a spatially extended source -- 6.9 Experimental methods for source sound power determination -- 6.10 Source characterization -- Chapter 7. Sound Absorption and Sound Absorbers -- 7.1 Introduction -- 7.2 The effects of viscosity, thermal diffusion and relaxation processes on sound in gases -- 7.3 Forms of porous sound absorbent material -- 7.4 Macroscopic physical properties of porous sound-absorbing materials -- 7.5 The modified equation for plane wave sound propagation in gases contained within rigid porous materials -- 7.6 Sound absorption by a plane surface of uniform impedance -- 7.7 Sound absorption by thin porous sheets -- 7.8 Sound absorption by thick sheets of rigid porous material -- 7.9 Sound absorption by flexible cellular and fibrous materials -- 7.10 The effect of perforated cover sheets on sound absorption by porous materials -- 7.11 Non-porous sound absorbers -- 7.12 Methods of measurement of boundary impedance and absorption coefficient -- Chapter 8. Sound in Waveguides -- 8.1 Introduction -- 8.2 Plane wave pulses in a uniform tube -- 8.3 Plane wave modes and natural frequencies of fluid in uniform waveguides -- 8.4 Response to harmonic excitation -- 8.5 A simple case of structure-fluid interaction -- 8.6 Plane waves in ducts that incorporate impedance discontinuities -- 8.7 Transverse modes of uniform acoustic waveguides -- 8.8 Harmonic excitation of waveguide modes -- 8.9 Energy flux in a waveguide of rectangular cross-section with rigid walls -- 8.10 Examples of the sound attenuation characteristics of lined ducts and splitter attenuators -- 8.11 Acoustic horns -- Chapter 9. Sound in Enclosures -- 9.1 Introduction -- 9.2 Some general features of sound fields in enclosures -- 9.3 Apology for the rectangular enclosure.
9.4 The impulse response of fluid in a reverberant rectangular enclosure -- 9.5 Acoustic natural frequencies and modes of fluid in a rigid-walled rectangular enclosure -- 9.6 Modal energy -- 9.7 The effects of finite wall impedance on modal energy-time dependence in free vibration -- 9.8 The response of fluid in a rectangular enclosure to harmonic excitation by a point monopole source -- 9.9 The sound power of a point monopole in a reverberant enclosure -- 9.10 Sound radiation into an enclosure by the vibration of a boundary -- 9.11 Probabilistic wave field models for enclosed sound fields at high frequency -- 9.12 Applications of the diffuse field model -- 9.13 A brief introduction to geometric (ray) acoustics -- Chapter 10. Structure-borne Sound -- 10.1 The nature and practical importance of structure-borne sound -- 10.2 Emphasis and content of the chapter -- 10.3 The energy approach to modelling structure-borne sound -- 10.4 Quasi-longitudinal waves in uniform rods and plates -- 10.5 The bending wave in uniform homogeneous beams -- 10.6 The bending wave in thin uniform homogeneous plates -- 10.7 Transverse plane waves in flat plates -- 10.8 Dispersion curves, wavenumber vector diagrams and modal density -- 10.9 Structure-borne wave energy and energy flux -- 10.10 Mechanical impedances of infinite, uniform rods, beams and plates -- 10.11 Wave energy transmission through junctions between structural components -- 10.12 Impedance, mobility and vibration isolation -- 10.13 Structure-borne sound generated by impact -- 10.14 Sound radiation by vibrating flat plates -- Chapter 11. Transmission of Sound through Partitions -- 11.1 Practical aspects of sound transmission through partitions -- 11.2 Transmission of normally incident plane waves through an unbounded partition -- 11.3 Transmission of sound through an unbounded flexible partition.
11.4 Transmission of diffuse sound through a bounded partition in a baffle -- 11.5 Double-leaf partitions -- 11.6 Transmission of normally incident plane waves through an unbounded double-leaf partition -- 11.7 The effect of cavity absorption -- 11.8 Transmission of obliquely incident plane waves through an unbounded double-leaf partition -- 11.9 Close-fitting enclosures -- 11.10 A simple model of a noise control enclosure -- 11.11 Measurement of sound reduction index (transmission loss) -- Chapter 12. Reflection, Scattering, Diffraction and Refraction -- 12.1 Introduction -- 12.2 Scattering by a discrete body -- 12.3 Scattering by crowds of rigid bodies -- 12.4 Resonant scattering -- 12.5 Diffraction -- 12.6 Reflection by thin, plane rigid sheets -- 12.7 Refraction -- Appendix 1. Complex exponential representation of harmonic functions -- A1.1 Harmonic functions of time -- A1.2 Harmonic functions of space -- A1.3 CER of travelling harmonic plane waves -- A1.4 Operations on harmonically varying quantities represented by CER -- Appendix 2. Frequency Analysis -- A2.1 Introduction -- A2.2 Categories of signal -- A2.3 Fourier analysis of signals -- A2.4 Presentation of the results of frequency analysis -- A2.5 Frequency response functions -- A2.6 Impulse response -- Appendix 3. Spatial Fourier Analysis of Space-Dependent Variables -- A3.1 Wavenumber transform -- A3.2 Wave dispersion -- Appendix 4. Coherence and Cross-Correlation -- A4.1 Background -- A4.2 Correlation -- A4.3 Coherence -- A4.4 The relation between the cross-correlation and coherence functions -- Appendix 5. The Simple Oscillator -- A5.1 Free vibration of the undamped mass-spring oscillator -- A5.2 Impulse response of the undamped oscillator -- A5.3 The viscously damped oscillator -- A5.4 Impulse response of the viscously damped oscillator.
A5.5 Response of a viscously damped oscillator to harmonic excitation -- Appendix 6. Measures of Sound, Frequency Weighting and Noise Rating Indicators -- A6.1 Introduction -- A6.2 Pressure-time history -- A6.3 Mean square pressure -- A6.4 Sound pressure level -- A6.5 Sound intensity level -- A6.6 Sound power level -- A6.7 Standard reference curves -- Appendix 7. Demonstrations and Experiments -- A7.1 Introduction -- A7.2 Demonstrations -- A7.3 Formal laboratory class experiments -- Answers -- Bibliography -- References -- Index.
Abstract:
Foundations of Engineering Acoustics takes the reader on a journey from a qualitative introduction to the physical nature of sound, explained in terms of common experience, to mathematical models and analytical results which underlie the techniques applied by the engineering industry to improve the acoustic performance of their products. The book is distinguished by extensive descriptions and explanations of audio-frequency acoustic phenomena and their relevance to engineering, supported by a wealth of diagrams, and by a guide for teachers of tried and tested class demonstrations and laboratory-based experiments. Foundations of Engineering Acoustics is a textbook suitable for both senior undergraduate and postgraduate courses in mechanical, aerospace, marine, and possibly electrical and civil engineering schools at universities. It will be a valuable reference for academic teachers and researchers and will also assist Industrial Acoustic Group staff and Consultants. Comprehensive and up-to-date: broad coverage, many illustrations, questions, elaborated answers, references and a bibliography Introductory chapter on the importance of sound in technology and the role of the engineering acoustician Deals with the fundamental concepts, principles, theories and forms of mathematical representation, rather than methodology Frequent reference to practical applications and contemporary technology Emphasizes qualitative, physical introductions to each principal as an entrée to mathematical analysis for the less theoretically oriented readers and courses Provides a 'cook book' of demonstrations and laboratory-based experiments for teachers Useful for discussing acoustical problems with non-expert clients/managers because the descriptive sections are couched in largely non-technical language and any jargon is explained Draws on the vast pedagogic experience
of the writer.
Local Note:
Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2017. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.
Genre:
Electronic Access:
Click to View