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Howard, Carl Q. Bies, Colin H. Hansen and Carl Q. Description: Fifth edition. B54 DDC His knowledge and insights will be sorely missed. Contents Preface to the First Edition. The book begins with an introduction to terminology and basic concepts of acoustic wave description and propagation. A discussion of the ear, the subject of Chapter 2, is used as a basis for the understanding of such matters as acoustical masking and hearing damage due to excessive noise exposure.

A practical guide to instrumentation follows in Chapter 3. Criteria which always form the basis for a noise control solution are considered in Chapter 4. A review of long accepted data is used to show that hearing loss due to noise exposure is related to the integral of pressure, which is expressed in this book in terms of a hearing deterioration index HDI , and not the integral of energy pressure squared , as universally assumed and implemented in legislation throughout Europe and Australia.

Also included is a comprehensive discussion of outdoor sound propagation. Within the limitations of the analysis the optimisation of reverberation control is discussed. In the discussion of barriers and enclosures of Chapter 8, new procedures are provided for estimating sound transmission loss of single and double panel wall constructions. Simple new procedures for estimating expected attenuation of lined ducts of both rectangular and circular cross section are presented.

This analysis is much more useful than the commonly used transmission loss analysis which gives no indication of insertion loss. Exhaust duct directivity information is new and is based upon previously unreported model studies. Chapter 10 is concerned with vibration control from the point of view of noise suppression. Vibration isolation and the use of vibration absorbers are discussed in detail.

The concepts of resonant and nonresonant vibration modes, and how they contribute to sound radiation, are discussed with reference to the appropriate use of vibration damping material. Semi-empirical prediction schemes for estimating the sound power radiated by a number of commonly encoun- tered industrial noise sources are presented in Chapter The book concludes with Chapter 12 in which several recently developed analytical techniques for the estimation of radiated sound power of complex structures are reviewed.

Problems suitable for students using the text are included in Appendix A. Appendix B lists important properties of a number of materials. Where possible, references are given within the text to books, reports and technical papers which may provide the reader with a more detailed treatment of their subject matter than is possible here.

David A. Bies Colin H. The major additions are outlined below. The removal of Chapter 12 on active noise control is partly due to lack of space and partly because a more comprehensive and a more useful treatment is available in the book, Understanding Active Noise Cancellation by Colin H. Chapter 2 has been updated to include some recent discoveries regarding the mechanism of hearing damage. In Chapter 4, the section on evaluation of environmental noise has been updated and rewrit- ten.

Many parts of Section 5. The treatment of a vibrating sphere dipole source has also been considerably expanded. In Chapter 7, the section on speech intelligibility in auditoria has been considerably expanded and includes some guidance on the design of sound reinforcement systems. The section on the measurement of the room constant has been expanded and explained more clearly. In the section on auditoria, a discussion of the optimum reverberation time in classrooms has now been included.

In Chapter 8, the discussion on STC and weighted sound reduction index has been revised. The discussion now explains how to calculate the TL of multi-leaf and composite panels. Chapter 11 remains unchanged and Chapter 12 has been replaced with Chapter 13, where the previous content of Chapter 13 now serves as an introduction to a much expanded chapter on practical numerical acoustics written by Dr Carl Howard.

Emphasis is not on the theoretical aspects of these analyses but rather on the practical application of various software packages including a free open source boundary element package. Appendix B has been updated and considerably expanded with many more materials and their properties covered. The impedance expressions towards the end of Appendix C now include a discussion of multi-layered materials. It also contains a considerable amount of new material. We have tried to keep the book as a suitable text for later undergraduate and graduate students, while at the same time extending content that will make the book more useful to acoustical consultants and noise control engineers.

Chapter 1 now has a section on the Doppler shift caused by moving sources and receivers as well as a section on amplitude modulation and amplitude variation to complement the section on beating.

Chapter 2 is now a combination of Chapters 2 and 4 of the earlier editions. It made sense to us to combine the description of the ear, hearing response and loudness with criteria. New measures for quantifying noise have been included as well as a section on low-frequency loudness and the response of the hearing mechanism to infrasound.

The discussion on weighting networks has been extended to the G-weighting and Z-weighting networks and the frequency range covered by weighting networks has been extended at the low end to 0. Chapter 3 is now an updated version of what was in Chapter 3 in earlier editions.

Chapter 4 has been rearranged so that it only includes the sound source descriptions that were in Chapter 5 of earlier editions and it now includes sound power estimation schemes for various sources that were previously considered in a separate Chapter 6 of the previous editions.

The new Chapter 5 is entirely devoted to outdoor sound propagation. The required input data for each model and the limitations of each model are also discussed. Finally a section is dedicated to uncertainty analysis as we believe that it is very important that any noise level predictions are presented with an associated uncertainty. The self-noise produced by silencers is now discussed in more detail and procedures are now provided for its estimation.

In Chapter 9, which was Chapter 10 in previous editions, the treatment of vibration absorbers has been expanded; otherwise, not much else has changed from the fourth edition. The Chapter 10 Chapter 11 in previous editions sections on fan noise and transportation noise have been updated.

Chapter 11, which was Chapter 12 in the fourth edition, has been updated, but the content has not changed much from the fourth edition. Chapter 12 is a new chapter concerned entirely with frequency analysis. It is a very much expanded version of Appendix D in previous editions. This material, which was partly covered in an Appendix in previous editions, is an important part of understanding noise and vibration problems and, as such, it deserves a chapter of its own.

Appendix A is new and has been included to provide the background material on matrix algebra needed to fully appreciate the 4-pole material in Chapter 8 and the acoustic material property measurement procedures in Appendix D. Appendix E is new and includes background material needed to appreciate the material on the Harmonoise propagation model in Chapter 5.

Colin H. Hansen Carl Q. Related Papers. Fundamentals of Acoustics and Noise Control. By Jens Rindel. By Samantha Bennett. Vehicle noise and vibration refi nement. By Marcos Abrantes. Speech-in-noise enhancement and sound localization with improved binaural hearing instruments. By Jan Wouters. Understanding Active Noise Cancellation. By Saif Ali. Download pdf.

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Engineering Noise Control

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