Download or read book Propagation of Finite Amplitude Sound Beams with Application to Parametric Acoustic Arrays written by Jerry H. Ginsberg and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Waves Generated by Parametric Array Loudspeakers written by Jiaxin Zhong and published by CRC Press. This book was released on 2024-08-13 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parametric array loudspeakers (PALs) are capable of generating highly directional audio beams from nonlinear interactions of intense airborne ultrasound waves. This unique capability holds great potential in audio engineering. This book systematically introduces the physical principles of acoustics waves generated by PALs, along with the commonly used and the state-of-the-art numerical models, such as the Westervelt model, the convolution directivity model, the Gaussian beam expansion method, and the spherical wave expansion method. The properties of sound fields generated by PALs are analyzed. Also analyzed are various phenomena including the reflection of acoustics waves generated by PALs from a surface, transmission through a thin partition, scattering by a rigid sphere, and propagation in rooms. Furthermore, the steering and focusing of acoustics waves generated by PALs and potential applications of PALs in active sound control are investigated. Finally, the implementation issues of hardware, signal processing techniques, measurement, and safety are discussed. The book is tailored to meet the needs of researchers in this field, as well as audio practitioners and acoustics engineers.

Download or read book Nonlinear Acoustics written by Robert Thomas Beyer and published by . This book was released on 1975 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS: Introduction -- The Nature of Nonlinear Acoustics, Historical Aspects; Principles of Linear Acoustics; Some Sources of Nonlinear Oscillations; Nonlinear Propagation in Fluids; Shock Waves; Aeroacoustics; Radiation Pressure; Streaming; Cavitation; Nonlinear Interaction of Sound Waves; Applications of Nonlinear Interactions. The Parametric Array; Nonlinear Propagation in Solids.

Download or read book Sound Propagation Via Narrow Beam Audio Projection written by Felipe Andres Farias Alvarez and published by . This book was released on 2018 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The parametric acoustic array is a nonlinear phenomenon of physics theoretically described over fifty years ago. It consists in the generation of secondary sound waves by the propagation of two collimated primary ultrasonic waves at a close frequency. The sound wave generated corresponds to the difference of the frequencies propagated and its existence is independent from the ultrasonic waves, but it maintains the high directivity of the primary waves. According to Berktay's far-field solution, one of the main equations describing this phenomenon, the sound wave produced is proportional to the second derivative of the envelope of the original ultrasonic wave. Hence, the implementation of the parametric acoustic array is based on the modulation of signals to be transmitted as ultrasound, but demodulated in the propagation medium. Due to the nonlinear nature of the phenomenon and the use of modulation techniques in the implementation of the parametric acoustic array, harmonic distortion is generated. Moreover, the models describing the parametric acoustic array are based on many approximations so the results from the equations are inaccurate in many cases. Despite Westervelt introduced the theory over five decades ago, the research on parametric acoustic arrays presents many challenges in the present day. The majority of the efforts for increasing the quality of the demodulated signal have been focused on improving the modulation stage of the parametric acoustic array based on Berktay's solution. Furthermore, recent advances in the field of parametric acoustic arrays have demonstrated the frequency response of transducers has a big impact on the generation of secondary sound waves. This thesis aims to provide a model capable of improving the representation of the parametric acoustic array. For this reason, simulations using the KZK Texas code, a time-domain algorithm which calculates the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation, were carried out to replicate the parametric acoustic array in air. These results establish how the diffraction term of the KZK equation impacts on the generation of the secondary sound waves. As a result, a Burgers like equation was used instead of the KZK equation, decreasing the computation time significantly. In addition, parametric loudspeakers were simulated using k-Wave, a toolbox capable of computing linear and nonlinear propagation of acoustic waves. The results show the effects of Rayleigh distance and absorption length on the demodulated waves. Increasing the Rayleigh distance beyond the absorption length was proposed to obtain a demodulated wave 10 dB higher in the far-field, if compared to the cases where this condition is not met. Finally, an electroacoustic model describing the frequency response of the transducer generating the parametric acoustic array was developed in order to include it into the far-field solution. This model is based on a Van Dyke equivalent circuit capable of representing the frequency response of the array of piezoelectric transducers. The transfer function of the circuit was applied as a filter for the original signal and as per the definition of the far-field solution, the elements of the circuit become part of the demodulated wave. The model and the method used are based on mathematical development, simulations and experimental validation.

Download or read book Nonlinear Acoustics written by Robert Thomas Beyer and published by . This book was released on 1974 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Acoustics written by Malcolm J. Crocker and published by John Wiley & Sons. This book was released on 1998-03-09 with total page 1494 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Nonlinear Wave Processes in Acoustics written by K. Naugolnykh and published by Cambridge University Press. This book was released on 1998-05-28 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text considers models of different "acoustic" media as well as equations and behavior of finite-amplitude waves. It also considers the effects of nonlinearity, dissipation, dispersion, and for two- and three-dimensional problems, reflection and diffraction on the evolution and interaction of acoustic beams.

Download or read book Advances In Nonlinear Acoustics Proceedings Of The 13th International Symposium On Nonlinear Acoustics written by H Hoback and published by World Scientific. This book was released on 1993-06-18 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: The large range of applications of acoustical methods and techniques in modern society demands a thorough exploration of the nonlinear properties of sound wave propagation in different media and environments, and of the effects caused by nonlinear interaction of sound and medium. The great range of interesting physical phenomena which occur in nonlinear acoustics helps stimulate the extensive research in the field.

Download or read book Problems in Nonlinear Acoustics Pulsed Finite Amplitude Sound Beams Nonlinear Propagation of Sound in Layered Media Time Domain Solutions for Focused Sound Beams Focusing of Sound with an Ellipsoidal Mirror and Modeling Finite Amplitude Propagation in Waveguides written by and published by . This book was released on 1991 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five projects are discussed in this annual summary report, all of which involve basic research in physical acoustics, mainly nonlinear acoustics. (1) Pulsed Finite Amplitude Sound Beams are investigated numerically with a time domain computer algorithm, and experiments are underway to study nonlinear self- demodulation. (2) Nonlinear Propagation of Sound in Layered Media involves studies of shallow water above a penetrable bottom (both theory and experiment) and the SOFAR channel (only theory). (3) Time Domain Solutions for Axial Pressures in Focused Sound Beams is a theoretical comparison of three different models. (4) Focusing of Sound with an Ellipsoidal Mirror is a theoretical study of the reflected field, typically short pulses, along the axis of the mirror. (5) Modeling Finite Amplitude, Propagation in Waveguides with a Nonlinear Parabolic Wave Equation is a new project that involves both theory and experiment.

Download or read book Waves and Structures in Nonlinear Nondispersive Media written by Sergey Nikolaevich Gurbatov and published by Springer Science & Business Media. This book was released on 2012-03-23 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Waves and Structures in Nonlinear Nondispersive Media: General Theory and Applications to Nonlinear Acoustics” is devoted completely to nonlinear structures. The general theory is given here in parallel with mathematical models. Many concrete examples illustrate the general analysis of Part I. Part II is devoted to applications to nonlinear acoustics, including specific nonlinear models and exact solutions, physical mechanisms of nonlinearity, sawtooth-shaped wave propagation, self-action phenomena, nonlinear resonances and engineering application (medicine, nondestructive testing, geophysics, etc.). This book is designed for graduate and postgraduate students studying the theory of nonlinear waves of various physical nature. It may also be useful as a handbook for engineers and researchers who encounter the necessity of taking nonlinear wave effects into account of their work. Dr. Gurbatov S.N. is the head of Department, and Vice Rector for Research of Nizhny Novgorod State University. Dr. Rudenko O.V. is the Full member of Russian Academy of Sciences, the head of Department at Moscow University and Professor at BTH (Sweden). Dr. Saichev A.I. is the Professor at the Faculty of Radiophysics of Nizhny Novgorod State University, Professor of ETH Zürich.

Download or read book Ultrasonics International 83 written by Sam Stuart and published by Elsevier. This book was released on 2013-09-11 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonics International 83 contains the proceedings of the Ultrasonics International Conference held in Halifax, Canada, on July 12-14, 1983. The papers focus on the role of ultrasound in various fields such as non-destructive testing, aerospace, high power, and medicine. The papers are organized into 24 sessions, which first discuss the applications of ultrasonics in aerospace. The session on non-destructive testing then describes ultrasonic applications including automatic in-motion inspection of the tread of railway wheels by EMA excited Rayleigh waves; effect of material deformation on the velocity of critically refracted shear waves in railroad rail; and crack depth estimation using wideband laser generated surface acoustic waves. The next session is concerned with medical ultrasonics and includes papers exploring the use of reflectivity tomography in attenuating media, wave propagation in biological tissue, and ultrasonic Doppler measurement of blood flow volume rate in the abdomen. The sessions that follow consider acoustic emission, visualization, material characterization, optoacoustics, and the physics of ultrasonics. High power and underwater ultrasonics, acoustic microscopy, transducers, and instrumentation are also discussed. This monograph will be of value to physicists and other scientists interested in ultrasonics.

Download or read book Nonlinear Acoustics 1954 to 1983 written by and published by . This book was released on 1984 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects of Signal Processing written by G. Tacconi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: The summer school held in Portovenere followed a tutorial format with the purpose of familiarizing postdoctoral or postgraduate students in the basic theories and up-to-date applications of present knowledge. Although, from a teaching point of view, a certain areount of overlapping is always useful, in order to avoid excessive duplication direct contact between lecturers expert in the same subject was encouraged during the preparation phase. In recent years computer facilities and theoretical implementa tion have considerably increased the possibility of solving problems relating to signal detection in noise. Any type of communication may take advantage of signal processing principles, including any type of physical measurement that can be considered as a non-semantic and/or quasi-semantic communication. Since signal processing techniques are common to many branches of science (telecommunications, radar, sonar, seismology, geophysics, nuclear research, space research and others), the advanced and sophisticated levels reached singularly in anyone of them could be used to the advantage of the others. In particular, underwater acoustics is a discipline which, to some extent, represents a practical general model that has permitted the development of signal processing techniques suitable to meet data reduction and interpretation needs of other branches of science. This ASI consequently underlined the inter-disciplinarity of signal proces sing in order that the principles of outstanding methods developed in one field may be adapted to others.

Download or read book Diagnostic Ultrasound Imaging Inside Out written by Thomas L. Szabo and published by Academic Press. This book was released on 2013-12-05 with total page 829 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diagnostic Ultrasound Imaging provides a unified description of the physical principles of ultrasound imaging, signal processing, systems and measurements. This comprehensive reference is a core resource for both graduate students and engineers in medical ultrasound research and design. With continuing rapid technological development of ultrasound in medical diagnosis, it is a critical subject for biomedical engineers, clinical and healthcare engineers and practitioners, medical physicists, and related professionals in the fields of signal and image processing. The book contains 17 new and updated chapters covering the fundamentals and latest advances in the area, and includes four appendices, 450 figures (60 available in color on the companion website), and almost 1,500 references. In addition to the continual influx of readers entering the field of ultrasound worldwide who need the broad grounding in the core technologies of ultrasound, this book provides those already working in these areas with clear and comprehensive expositions of these key new topics as well as introductions to state-of-the-art innovations in this field. Enables practicing engineers, students and clinical professionals to understand the essential physics and signal processing techniques behind modern imaging systems as well as introducing the latest developments that will shape medical ultrasound in the future Suitable for both newcomers and experienced readers, the practical, progressively organized applied approach is supported by hands-on MATLAB® code and worked examples that enable readers to understand the principles underlying diagnostic and therapeutic ultrasound Covers the new important developments in the use of medical ultrasound: elastography and high-intensity therapeutic ultrasound. Many new developments are comprehensively reviewed and explained, including aberration correction, acoustic measurements, acoustic radiation force imaging, alternate imaging architectures, bioeffects: diagnostic to therapeutic, Fourier transform imaging, multimode imaging, plane wave compounding, research platforms, synthetic aperture, vector Doppler, transient shear wave elastography, ultrafast imaging and Doppler, functional ultrasound and viscoelastic models

Download or read book Grants and awards National Science Foundation U S 1981 written by and published by . This book was released on 1965 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustics A Textbook for Engineers and Physicists written by Jerry H. Ginsberg and published by Springer. This book was released on 2017-10-04 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides graduate and advanced undergraduate students with a comprehensive introduction to the application of basic principles and concepts for physical and engineering acoustics. Many of the chapters are independent, and all build from introductory to more sophisticated material. Written by a well-known textbook author with 39 years of experience performing research, teaching, and mentoring in the field, it is specially designed to provide maximum support for learning. Derivations are rigorous and logical, with thorough explanations of operations that are not obvious. Many of the derivations and examples have not previously appeared in print. Important concepts are discussed for their physical implications and implementation. Many of the 56 examples are mini case studies that address systems students will find to be interesting and motivating for continued study. The example solutions address both the significance of the example and the reasoning underlying the formulation. Tasks that require computational work are fully explained. This volume contains 168 homework exercises, accompanied by a detailed solutions manual for instructors. Building on the foundation provided in Volume I: Fundamentals, this text offers a knowledge base that will enable the reader to begin undertaking research and to work in the core areas of acoustics.