Problems in Nonlinear Acoustics: Parametric Receiving Arrays, Focused Finite Amplitude Sound, & Noncollinear Tone-Noise Interactions

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1987
Accession Number
ADA182518

Entities

People

  • Mark F. Hamilton

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Acoustics
  • Amplitude
  • Coordinate Systems
  • Difference Frequency
  • Diffraction
  • Doppler Effect
  • Engineering
  • Environment
  • Focal Planes
  • Geometry
  • Measurement
  • Optical Lattices
  • Scattering
  • Spectra
  • Waveforms
  • Waves

Fields of Study

  • Engineering
  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.