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Structural Acoustics

Author: Joshua E. Greenspon
Publisher: CRC Press
ISBN: 1439830940
Size: 20.30 MB
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From jet engine noise that generates vibrations in the structure of an aircraft, to the sound radiation from the hull of a ship or submarine that makes it identifiable, an understanding of structural acoustics is key in the design process in maritime, automotive, aerospace, and architectural engineering. Building on classic works in the field, Structural Acoustics: Deterministic and Random Phenomena presents fundamental concepts, relations, and simplified methods for calculating complex problems associated with vibrations and noise issues of automobiles, ships, submarines, and aircraft. This practical reference studies the response of structures and media that are coupled with a fluid and are under static, dynamic, and random loading. Simplified solutions to complicated problems Starting with a review of the fundamentals of acoustics and structural acoustics, the book discusses the response of the beams, plates, and shells that compose most built-up structures before providing methods for solving problems of built-up systems, including a procedure for computing the response of an elastic or viscoelastic media without resorting to a large computer program. Building on this analysis, the second section develops the analysis for random loading, which can also be applied to geophysical phenomena and viscoelastic media. Proceeding from the fundamental aspects of simple structures to more complicated cases with more involved loading, the book presents formulas and applications for random loading. By providing a fundamental understanding of sound radiation in air and water, this book shows readers how to solve structural and acoustical problems. An important reference for those working in the area of acoustics and vibration analysis, it also includes computer programs for acoustical analysis available at www.crcpress.com.

Handbook Of Acoustics

Author: Malcolm J. Crocker
Publisher: John Wiley & Sons
ISBN: 9780471252931
Size: 33.36 MB
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Acoustical engineers, researchers, architects, and designers need a comprehensive, single-volume reference that provides quick and convenient access to important information, answers and questions on a broad spectrum of topics, and helps solve the toughest problems in acoustical design and engineering. The Handbook of Acoustics meets that need. It offers concise coverage of the science and engineering of acoustics and vibration. In more than 100 clearly written chapters, experts from around the world share their knowledge and expertise in topics ranging from basic aerodynamics and jet noise to acoustical signal processing, and from the interaction of fluid motion and sound to infrasound, ultrasonics, and quantum acoustics. Topics covered include: * General linear acoustics * Nonlinear acoustics and cavitation * Aeroacoustics and atmospheric sound * Mechanical vibrations and shock * Statistical methods in acoustics * Architectural acoustics * Physiological acoustics * Underwater sound * Ultrasonics, quantum acoustics, and physical aspects of sound * Noise: its effects and control * Acoustical signal processing * Psychological acoustics * Speech communication * Music and musical acoustics * Acoustical measurements and instrumentation * Transducers The Handbook of Acoustics belongs on the reference shelf of every engineer, architect, research scientist, or designer with a professional interest in the propagation, control, transmission, and effects of sound.

Fundamentals Of Shallow Water Acoustics

Author: Boris Katsnelson
Publisher: Springer Science & Business Media
ISBN: 1441997776
Size: 68.41 MB
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Shallow water acoustics (SWA), the study of how low and medium frequency sound propagates and scatters on the continental shelves of the worlds oceans, has both technical interest and a large number of practical applications. Technically, shallow water poses an interesting medium for the study of acoustic scattering, inverse theory, and propagation physics in a complicated oceanic waveguide. Practically, shallow water acoustics has interest for geophysical exploration, marine mammal studies, and naval applications. Additionally, one notes the very interdisciplinary nature of shallow water acoustics, including acoustical physics, physical oceanography, marine geology, and marine biology. In this specialized volume the authors, all of whom have extensive at-sea experience in US and Russian research efforts, have tried to summarize the main experimental, theoretical, and computational results in shallow water acoustics, with an emphasis on providing physical insight into the topics presented.

Applied Gas Dynamics

Author: Ethirajan Rathakrishnan
Publisher: John Wiley & Sons
ISBN: 0470825766
Size: 25.57 MB
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In Applied Gas Dynamics, Professor Ethirajan Rathakrishnan introduces the high-tech science of gas dynamics, from a definition of the subject to the three essential processes of this science, namely, the isentropic process, shock and expansion process, and Fanno and Rayleigh flows. The material is presented in such a manner that beginners can follow the subject comfortably. Rathakrishnan also covers the theoretical and application aspects of high-speed flows in which enthalpy change becomes significant. Covers both theory and applications Explains involved aspects of flow processes in detail Provides a large number of worked through examples in all chapters Reinforces learning with concise summaries at the end of every chapter Contains a liberal number of exercise problems with answers Discusses ram jet and jet theory -- unique topics of use to all working in the field Classroom tested at introductory and advanced levels Solutions manual and lecture slides available for instructors Applied Gas Dynamics is aimed at graduate students and advanced undergraduates in Aerospace Engineering and Mechanical Engineering who are taking courses such as Gas Dynamics, Compressible Flows, High-Speed Aerodynamics, Applied Gas Dynamics, Experimental Aerodynamics and High-Enthalpy Flows. Practicing engineers and researchers working with high speed flows will also find this book helpful. Lecture materials for instructors available at http://www.wiley.com/go/gasdyn

Vibro Acoustics

Author: Dhanesh N. Manik
Publisher:
ISBN: 9781466580930
Size: 72.27 MB
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"The subject of vibro-acoustics is important for the better design of machine elements and structures, to minimize sound generated by them. In view of the design cycles of machines becoming shorter, designers need to design quiet machines at the drawing-board stage rather than applying "band-aid" techniques after the machine has been built. Those interested in low-frequency vibration are generally concerned with the modal approach of using natural frequencies and mode shapes, whereas those interested in vibro-acoustics in medium and high frequencies are generally concerned with the wave approach. Since both approaches have their advantages, it is a good idea to study both together to get the best out of them. This is useful for a better understanding of the physics of vibro-acoustics. Written for students and professionals, this book systematically integrates the relevant aspects of vibro-acoustics from various viewpoints and Covers fundamental aspects of noise and vibration along with statistical energy analysis (SEA) Discusses both modal and wave approaches for studying dynamic systems Simplifies circuit theory concepts Provides a solid understanding of the physics of vibro-acoustics through seamless integration of vibration and acoustics Offers guidance for professionals in using SEA software"--

Stochastic Wave Propagation

Author: K. Sobczyk
Publisher: Elsevier
ISBN: 0444598049
Size: 35.10 MB
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This is a concise, unified exposition of the existing methods of analysis of linear stochastic waves with particular reference to the most recent results. Both scalar and vector waves are considered. Principal attention is concentrated on wave propagation in stochastic media and wave scattering at stochastic surfaces. However, discussion extends also to various mathematical aspects of stochastic wave equations and problems of modelling stochastic media.

The Statistical Stability Phenomenon

Author: Igor I. Gorban
Publisher: Springer
ISBN: 331943585X
Size: 79.23 MB
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This monograph investigates violations of statistical stability of physical events, variables, and processes and develops a new physical-mathematical theory taking into consideration such violations – the theory of hyper-random phenomena. There are five parts. The first describes the phenomenon of statistical stability and its features, and develops methods for detecting violations of statistical stability, in particular when data is limited. The second part presents several examples of real processes of different physical nature and demonstrates the violation of statistical stability over broad observation intervals. The third part outlines the mathematical foundations of the theory of hyper-random phenomena, while the fourth develops the foundations of the mathematical analysis of divergent and many-valued functions. The fifth part contains theoretical and experimental studies of statistical laws where there is violation of statistical stability. The monograph should be of particular interest to engineers and scientists in general who study the phenomenon of statistical stability and use statistical methods for high-precision measurements, prediction, and signal processing over long observation intervals.

Fluid Structure Interactions And Uncertainties

Author: Abdelkhalak El Hami
Publisher: John Wiley & Sons
ISBN: 1848219393
Size: 80.18 MB
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The field of fluid—structure interactions groups together the study of all phenomena that present the coupling of the movement of a structure with that of a fluid. This is the mutuel interaction that can link a fluid domain to its surrounding structure. The range of phenomena studied is very wide, from the study of vibrating cylinders in flows, as is the case in the nuclear industry, to vibrating structures in turbulent flows, and to free surface phenomena in reservoirs. This book deals with the different aspects of fluid-structure interaction — vibro-acoustic and aerodynamic — by reducing the coupled fluid-structure model. Uncertainties are present in the study of the latter. An entire chapter is reserved for reliability-based design optimization (RBDO). The calculation tools used are : Ansys for the calculation of structures and Fluent for the calculation of fluids. For the examples processed using Ansys, the computer software is provided. Accompanied by detailed examples and including uncertainties, optimization and reliability, Fluid—Structure Interactions and Uncertainties presents the new, most effective design tools. The book is intended for engineering students and is a valuable support for practicing engineers and teacher-researchers.

Advances In Geophysics

Author: Haruo Sato
Publisher: Academic Press
ISBN: 9780080880334
Size: 30.64 MB
Format: PDF, Kindle
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Seismic waves generated by earthquakes have been interpreted to provide us information about the Earth’s structure across a variety of scales. For short periods of less than 1 second, the envelope of seismograms changes significantly with increased travel distance and coda waves are excited by scattering due to randomly distributed heterogeneities in the Earth. Deterministic structures such as horizontally uniform velocity layer models in traditional seismology cannot explain these phenomena. This book focuses on the Earth heterogeneity and scattering effects on seismic waves. Topics covered are recent developments in wave theory and observation including: coda wave analysis for mapping medium heterogeneity and monitoring temporal variation of physical properties, radiation of short-period seismic waves from an earthquake fault, weak localization of seismic waves, attenuation of seismic waves in randomly porous media, synthesis of seismic wave envelopes in short periods, and laboratory investigations of ultrasonic wave propagation in rock samples. Understanding new methods for the analysis of short-period seismic waves to characterize the random heterogeneity of the Earth on many scales Observations of seismic wave scattering Discussion of techniques for mapping medium heterogeneity and for monitoring temporal change in medium characteristics Up-to-date techniques for the synthesis of wave envelopes in random media

Advanced Theory Of Signal Detection

Author: Iickho Song
Publisher: Springer Science & Business Media
ISBN: 9783540430643
Size: 47.14 MB
Format: PDF
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We have some time ago noticed that finding a book dealing with topics in the ad vanced theory and applications of signal detection is not quite an easy matter. This is contrasted with that there are numerous books on the more general subject of de tection and estimation.Frankly, ourexperience and expertise is only on some partial portions of the theory and recent topics of signal detection. This book is therefore meant to include not all the advanced and interesting topics in the theory and appli cations ofsignal detection, butjust onlysome subsets of them: some such important and interesting topics and issues as distributed signal detection and sequential de tection are not considered only due to our limited knowledge and capacity. The goal we have in mind for this book is to present several advanced topics in signal detection theory and thereby help readers gain novel ideas and insights. In this book, we have tried to completely present in a unified way the theme oflocally optimum detection ofsignals in generalized observations. Among our hope is thus that the readers would be able to understand the concepts and fundamentals of a generalized observation model as applied to signal detection problems. This book will also allow the readers, whether they are students, academics, practitioners, or researchers, to have an expanded view on signal detection.