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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problems in Nonlinear Acoustics Parametric Receiving Arrays Focused Finite Amplitude Sound Noncollinear Tone Noise Interactions written by Mark F. Hamilton and published by . This book was released on 1987 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three projects are discussed in this report. (1) Parametric Receiving Arrays. This project is a theoretical investigation into the use of a parametric receiving array for directive measurements of noise radiated by ships in reverberant environments. The analysis is based on a Gaussian beam model that takes nearfield diffraction into account. The scattering of sound is also investigated. (2) Focused Finite Amplitude Sound. A numerical solution is used to investigate the combined effects of nonlinearity, diffraction, and absorption on sound that propagates through a focal region. The analysis yields time waveforms, axial propagation curves, spectral power distributions, and beams patterns. (3) Noncollinear Tone-Noise Interactions. The noncollinear interaction of a pure tone and a band of noise that propagate in different modes of a rectangular duct is investigated both experimentally and theoretically. Keywords: Nonlinear acoustics; Parametric array; Scattering of sound by sound; Focused sound; Waveguide; Noise.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1992 with total page 1848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problems in Nonlinear Acoustics Rayleigh Waves Pulsed Sound Beams and Waveguides written by and published by . This book was released on 1993 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three project topics, all in the area of nonlinear acoustics, are discussed in this annual summary report: (1) Nonlinear Rayleigh Waves (including diffraction effects in Rayleigh wave beams, local and nonlocal nonlinearity in Rayleigh waves, pulsed nonlinear Rayleigh waves, and nonlinear Stoneley waves); (2) Pulsed Finite Amplitude Sound Beams (including a uniformly valid axial solution for self-demodulation, and measurements of pulsed sound beams in water) ; and (3) Finite Amplitude Sound in Waveguides.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1992 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problems in Nonlinear Acoustics written by Mark F. Hamilton and published by . This book was released on 1992 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Theory of Sound Beams written by N.S. Bakhvalov and published by American Institute of Physics. This book was released on 1987 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problems in Nonlinear Acoustics Scattering of Sound by Sound Parametric Arrays Focused Sound Beams and Noncollinear Tone Noise Interactions written by Mark F. Hamilton and published by . This book was released on 1988 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five projects are discussed involving nonlinear acoustics. (1) Scattering of Sound by Sound, a theoretical study of two noncollinear Gaussian beams which interact to produce sum and difference frequency sound. (2) Parametric Receiving Arrays, a theoretical and numerical study of parametric reception in a reverberant environment. (3) Noncollinear Interaction of a Tone with Noise, an experimental investigation of the nonlinear interaction which occurs when the two waves propagate in different modes of a rectangular duct. (4) Nonlinear Effects in Focused Sound Beams, a preliminary analytical study of harmonic generation in the focal region. (5) Parametric Ultrasonic Proximity Sensor, a numerical investigation into the use of a parametric array as an ultrasonic proximity sensor in air. Keywords: Nonlinear acoustics; Parametric array; Acoustic arrays; Scattering of sound by sound; Focused sound; Waveguide; Noise. (JHD).
Download or read book Problems in Nonlinear Acoustics Parametric Receiving Arrays Focused Finite Amplitude Sound and Dispersive Nonlinear Interactions written by Mark F. Hamilton and published by . This book was released on 1986 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contract N00014-85-K-0708 provides for basic research on nonlinear acoustics. The three projects currently supported by the contract are as follows: 1) Use of a Parametric Receiving Array to Measure Ship Noise; 2) Focused Finite Amplitude Sound; and 3) Dispersive Nonlinear Wave Interactions in a Duct. The first project is the primary research effort supported by the contract, and the investigation is predominantly theoretical. The second involves computational analysis, the third experimental. Each project is discussed separately in the following sections. Keywords: Focused sound; Multipath; Hydrophones; Acoustic radiation.
Download or read book Nonlinear Acoustics Reflection and Refraction Scattering of Sound by Sound and Periodic Media written by David T. Blackstock and published by . This book was released on 1988 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on three topics in nonlinear acoustics is described. 1. Reflection and refraction at a plane interface between two fluids. Previously a modified form of Snell's law was derived; theoretical work is underway to investigate assumptions on which the derivation was based. 2. Scattering of sound by sound. Work on a single beam experiment and a crossed-beams experiment is in progress. 3. Propagation in periodic media. An experiment is being designed to measure finite-amplitude distortion in a plane wave tube loaded periodically with reactive branch elements. Other work, on noncollinear interaction and on biomedical ultrasonics, is described briefly. Two journal articles, five oral papers, and one technical report are listed. Keywords: Nonlinear acoustics; Periodic media; Scattering of sound by sound; Noncollinear interaction; Refraction; Reflection; Waveguide; Dispersion.
Download or read book Problems in Nonlinear Acoustics Surface Acoustic Waves Diffracting Sound Beams and Fluid Solid Interface Effects written by Mark F. Hamilton and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three subject areas, with emphasis on nonlinear acoustics, are discussed in this annual summary report: (1) Surface Acoustic Waves (evolution equations, generalized model equations for complex space-time dependencies, and nonlinearity coefficients for Rayleigh waves, and model equation for Stoneley waves); (2) Diffracting Sound Beams (modeling of noise and relaxation, measurements of focused beams, and transient solution for radiation from a parabolic antenna); and (3) Fluid-Solid Interface Effects (comparisons of 2-D and 3-D reflection for piston and Gaussian sources).
Download or read book Nonlinear Acoustics Periodic Waveguide Finite Amplitude Propagation in a Medium Having a Distribution of Relaxation Processes and Production of an Isolated Negative Pulse in Water written by and published by . This book was released on 1993 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on nonlinear acoustics has been performed during the 12- month period ending 30 September 1993. The following projects were completed. (1) Propagation in a periodic waveguide (2) Finite-amplitude propagation in a medium having a distribution of relaxation processes (3) Production of an isolated negative pulse in water Public communication of the research was accomplished through three theses, four oral papers, one journal article published, four journal articles submitted, and one paper in a symposium proceedings. Nonlinear acoustics, Relaxing media, Unipolar negative pulse, Generalized Burgers' equation, Bloch waves, Diffraction, Dispersion. Periodic waveguide, Temperature rise due to absorption.
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:
- Author :
- Publisher :
- Release : 1996
- ISBN :
- Pages : 10 pages
Problems in Nonlinear Acoustics Surface Acoustic Waves Nondestructive Testing and Acoustic Streaming
Download or read book Problems in Nonlinear Acoustics Surface Acoustic Waves Nondestructive Testing and Acoustic Streaming written by and published by . This book was released on 1996 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three projects in nonlinear acoustics are described: (1) Surface Acoustic Waves (derivation of theoretical models for Stoneley and Scholte waves in isotropic solids, surface waves in crystals, and surface waves in piezoelectric materials); (2) Nondestructive Testing (theory and experiment for ultrasonic measurement of third order elastic moduli via immersion techniques); (3) Acoustic Streaming (numerical modeling of acoustic streaming, at high Reynolds numbers, produced by focused sound beams containing shocks).
Download or read book Experimental investigation of propagation and reflection phenomena in finite amplitude sound beams written by Michalakis Andrea Averkiou and published by . This book was released on 1994 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
