Accession Number:

ADA270530

Title:

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

Descriptive Note:

Annual summary rept. no. 5, 1 Oct 1992-30 Sep 1993

Corporate Author:

TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s):

• Blackstock, David T.

Report Date:

1993-08-24

Pagination or Media Count:

26.0

Abstract:

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,

Descriptors:

• *ACOUSTIC WAVES
• *WAVE PROPAGATION
• TEMPERATURE
• HARMONICS
• DIFFRACTION
• RELAXATION
• AMPLITUDE
• NONLINEAR PROPAGATION ANALYSIS
• DISPERSIONS
• ABSORPTION
• ACOUSTICS
• PULSES
• WAVEGUIDES
• WATER

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE