Acoustic Wave Propagation through Experiments and Numerical Simulations Turbulent Fields: Experimental and Numerical Simulations

Friday, December 8, 1995 4:00 p.m. Philippe Blanc-Benon Centre Acoustique, Ecole Centrale de Lyon Lyon, France One of the most interesting features of sound is that its propagation characteristics are greatly influenced by the medium through which it travels. Through the processes of convection, refraction and scattering, acoustic waves may be bent, attenuated, or amplified.…

Energy Density Measurement in a Reverberation Room

Monday, December 4, 1995 3:00 p.m. Monica Obermier Electrical Engineering Department The University of Texas at Austin Accurate acoustical measurements in a reverberant enclosure are very impor­tant for applications which range from determining the sound power output of noisy machinery to measurement of the sound transmission loss of par­titions. The sound power can be determined…

The Acoustics of High Speed Flow Over a Blunt Body with a Forward-Facing Cavity

Friday, November 17, 1995 4:00 p.m. William A. Engblom Aerospace Engineering and Engineering Mechanics Department University of Texas at Austin There is substantial interest in increasing the flight speed of kinetic energy anti-armor penetrators. Unfortunately, in the range of interest (Mach 6 to 12), it is expected that the aerodynamic heating of nose regions of…

Intensified Cavitation Produced with Pressure Release and Rigid Ellipsoidal Reflectors

Friday, November 10, 1995 4:30 p.m. Michael Bailey Mechanical Engineering Department and Applied Research Laboratories The University of Texas at Austin An underwater bubble grows in response to a strong negative acoustic pulse and then collapses because of inertial forces. An auxiliary positive pulse, delayed to arrive after collapse begins, is shown numerically and experimentally…

Numerical Simulation of Noise Reduction by an Irregularly-Edged Barrier

Friday, November 3, 1995 4:00 p.m. Won-Suk Ohm Mechanical Engineering Department The University of Texas at Austin The performance of an irregularly-edged barrier is investigated numerically. The main motivation of this work is Steve Ho’s model experiment on an irregularly-edged barrier (reported in a recent acoustics seminar). The sim­plest case of a plane N wave…

Computational Ocean Acoustics for Range Dependent Shallow Water Waveguides Using a Normal Mode Approach

Friday, September 22, 1995 4:00 p.m. Dr. David P. Knobles The Applied Research Laboratories The University of Texas at Austin Modeling acoustic propagation in shallow water and/or littoral ocean environments is a difficult problem in present day computational ocean acoustics. Unlike deep water prop­agation, the propagation of sound in shallow water waveguides is usually characterized…