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Mechanics of Flow-Induced Sound and Vibration, Volume 2
It has been 31 years since the publication of the first edition of Mechanics of Flow-Induced Sound and Vibration and I believe that the foundations and fundamentals of the combined subject of aero-hydro acoustics were well-established at the time of the first edition. However, in the time since then while there have been developments in those fundamentals there has also been an extensive growth in applications and methods of applications. This growth has been made possible by the development of computational tools, personal computers, data acquisition hardware and software, and sensors. These were not available at the time of edition 1. In fact personal tools such as, Matlab, Mathematica, Mathcad, and Labview, now widely used in academic and commercial applications were not available to the reader either. The science of aero-hydroacoustic phenomena has really benefitted from the use of simultaneously-collected multichannel sensor arrays as well. Finally, the range of applications has grown under the combined pulls of consumer awareness and intolerance of noise and vibration, public legislation requiring noise control, and military needs.
Computational tools have made possible both direct numerical simulations for research and detailed design engineering applications. I have attempted to selectively extend the coverage of edition 1 into these new growth areas while at the same time maintaining the structure and philosophy of the book and not substantially increasing its size. In some areas the newly developed numerical technologies have made it possible to conduct “numerical experiments” that parallel and complement physical experiments, thereby leveraging the capabilities of both. I have used some of these in the areas of jet noise, boundary layer noise, and rotor noise as examples to address the application of numerical techniques. I have avoided going into numerical methods, however, since there are now numerous books on the techniques of computational fluid mechanics, large eddy simulations, and finite element methods making it duplicative to address these techniques, themselves.
The formalisms developed here are suitable for evaluation on a personal computer, but closed-form asymptotic solutions are also given for immediate interpretation for understanding trends in data. The book is written principally as a reference work, although it may be used as a teaching aid. The reader will always find theoretical results supported by step-by-step derivations that identify any assumptions made. For as many sources of sound as possible, each chapter is illustrated with comparisons of leading-order formulas, measured data, and results of numerical simulations.
In writing the first edition I provided a comprehensive list of references in each focus area. Each of these I read and integrated into the text. This was intended in edition 2, but I soon faced the reality that the number of papers published in any area is now too large to treat in this manner. One journal has a search engine that provides the user with a year-by-year distribution of papers published in a selected area. The annual publication rate in one area increased in that journal by a factor of 10 beginning in 1999–2000. Accordingly in this edition the list of references has been expanded, but admittedly less exhaustively than in the first.
As noted above the presentation philosophy and organization of the first edition has been maintained in this second edition with fundamentals central to Volume 1 and more complex geometry and fluid-structure interaction the subjects of Volume 2. Considering Volume 1, an area of addition and change is in Chapter 3 of Volume 1 where the discussion of turbulence statistics and jet noise have been changed and expanded; this required an additional section in Chapter 2 of Volume 1 on the effects of source convection and the Doppler effect. Chapters 4 and 5 of Volume 1 have been updated to meet the needs of the other chapters for which they provide fundamentals. Chapter 6 of Volume 1 has been revised to present the latest views on bubble dynamics, cavitation inception, and acoustic transmission in bubbly media. Regarding Volume 2, we have changed chapter numbering, but not the chapter subjects. Accordingly, Chapter 1, of this volume, Hydrodynamically Induced Cavitation and Bubble Noise, now addresses the phenomena related to hull pressure fluctuations on ships due to extensive propeller cavitation. Chapter 2, Essentials of Turbulent Wall Pressure Fluctuations, and Chapter 3, Response of Arrays and Structures to Turbulent Wall Flow and Random Sound, have been extensively reworked. The section on the use of sensors and arrays has been moved from Chapter 2, Essentials of Turbulent Wall Pressure Fluctuations, to Chapter 3, Response of Arrays and Structures to Turbulent Wall Flow and Random Sound; Chapter 2, Essentials of Turbulent Wall Pressure Fluctuations, now deals exclusively with the science of boundary layer pressure and Chapter 3, Response of Arrays and Structures to Turbulent Wall Flow and Random Sound, deals with response of sensors, sensor arrays, and elastic structures. Together, these chapters now present the modern views of turbulent boundary layer wall pressure fluctuations at low wave number, radiated sound, rough wall boundary layers, and the effects of steps and gaps on sound. Chapter 4, Sound Radiation From Pipe and Duct Systems, presents a more comprehensive treatment of flow-excitation and radiated sound from elastic cylinders, both ducts and shells. This coverage recognizes the capability of obtaining modal solutions on personal computers. Chapter 5, Noncavitating Lifting Sections, and Chapter 6, Noise From Rotating Machinery, have also been revised, although less extensively so. Turbulence ingestion noise was not well understood when edition 1 was written; edition 2 provides an expanded treatment for lifting surfaces and propeller fans. Chapter 6, Noise From Rotating Machinery, provides more examples of comparisons between theory and measurement than were possible for edition 2.
- Presents every important topic in flow-induced sound and vibration
- Covers all aspects of the topics addressed, from fundamental theory, to the analytical formulas used in practice
- Provides the building blocks of computer modeling for flow-induced sound and vibration
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