Acoustic-Aerosol Interactions in a Three Dimensional Standing Wave Chamber

Friday, October 28, 1994 4:00 p.m. Professor Ofodike Ezekoye Department of Mechanical Engineering The University of Texas at Austin A range of applications (from environmental to materials processing) rely on technological and scientific developments related to aerosol dynamics. A particularly underutilized but potentially significant approach to controlling the aerosol size distribution for a variety of…

Characterizing Fluid Flow Through a Perforation Using Ultrasonic Doppler Velocimetry

Friday, October 21, 1994 4:00 p.m. Muhammad Razi Department of Petroleum Engineering The University of Texas at Austin The objective of this experimental study is to develop an ultrasonic measurement technique to determine the velocity of fluid flow from a perforation in a petroleum well. The measurement will be made from inside the well. Preliminary…

Airport Noise

Monday, October 17, 1994 4:00 p.m. Michael T. McNerney Center for Transportation Research Department of Civil Engineering The University of Texas at Austin This seminar is designed to provide a better understanding of the airport noise problem, which is one of the most demanding problems facing our na­tion’s airports today. The lecture will describe the…

Characterizing Fluid Flow Through a Perforation Using Ultrasonic Doppler Velocimetry

Friday, 23 September 1994 4:30 p.m. Muhammad Razi Department of Petroleum Engineering The University of Texas at Austin The objective of this experimental study is to develop an ultrasonic measurement technique to determine the velocity of fluid flow from a perforation in a petroleum well. The measurement will be made from inside the well. Preliminary…

Wind Dependence of Low Frequency Ambient Noise at a Deep Site in the Pacific Ocean

Friday, May 6, 1994 4:00 p.m. Joan Schoppe Applied Research Laboratories Ambient noise recorded at a deep ocean site in the Pacific Ocean was analyzed to determine wind speed dependence. The OUTPOST SUNRISE ex­periment was conducted to measure low frequency ambient noise in a high bottom loss area using a bottom-located, vertical hydrophone array. Wind…

Digital Signal Processing Realization of Maximum Length Sequence Based System Response Measurements

Friday, April 1, 1994 4:00 p.m. Craig Blome Department of Electrical Engineering The University of Texas at Austin Results of a study of computationally efficient methods of system impulse re­sponse measurement are presented. Techniques using binary pseudorandom stim­uli known as maximum length sequences are reviewed and their performance in the presence of additive noise and…

Nonlinear Tube Waves

Thursday, March 10, 1994 2:00 p.m. David Johnson Schlumberger- Doll Research Ridgefield, Connecticut We consider the nonlinear characteristics of an acoustic tube wave propagating along the axis of a fluid-filled circular borehole in an elastic solid which is locally isotropic but whose properties may vary radially. The analysis is carried out in the quasi-static (i.e.,…

Experimental Investigation of Propagation and Reflection Phenomena in Finite Amplitude Sound Beams*

Wednesday, March 9, 1994 2:00 p.m. Michalakis A. Averkiou The University of Texas at Austin Measurements of finite amplitude sound beams are compared with theoretical predictions based on the KZK equation. Attention is devoted to harmonic gen­eration and shock formation related to a variety of propagation and reflection phenomena. Both focused and unfocused piston sources…

Music as Noise: Sound Transmission and Unbiased Annoyance

Friday, February 18, 1994 4:00 p.m. David A. Nelson Acoustic Systems Acoustical Research Facility The University of Texas at Austin Music is often perceived as noise pollution, especially when it invades one’s soli­tude or one’s own music-making. This is generally a major issue in multi-unit residential buildings and in music facilities for rehearsal, broadcast and…

Adaptive Multi-Level Substructuring in Structural Acoustics Computation

Friday, February 4, 1994 4:00 p.m. Matthew Kaplan Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin Computational structural acoustic analysis of submarines can be prohibitively expensive in certain frequency ranges because of the geometric complexity of the structure. A method for dealing with high order finite element models of submarines…