Friday, November 11, 1994 4:00 p.m. Dr. Robert L. Rogers Applied Research Laboratories The plasma sound source, also known as the spark source, has been in use in various niches in geophysical research and in biomedical applications for a number of years. Even with these applications, very little work has been done regarding the engineering,…
Friday, November 4, 1994 4:00 p.m. Douglas Meegan Department of Physics The University of Texas at Austin A surface wave is a wave that is confined to propagate along a two-dimensional surface of discontinuity in a three-dimensional elastic medium. This most basic characteristic of surface waves led to several practical applications that are in use…
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…
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…
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…
Friday, September 30, 1994 4:00 p.m. Michael Bailey Department of Mechanical Engineering The University of Austin Work has just begun on the experimental and theoretical investigation of sound propagation in a toroidal waveguide – an acoustitron. Since the acoustitron is a waveguide in the form of a closed loop, a traveling time harmonic wave within…
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…
Friday, 23 September 1994 4:00 p.m. Tom Maher Department of Petroleum Engineering The University of Texas at Austin Production logging can be defined as any operation that answers the question “How much of which fluid is coming from where?” The fundamental problem is to measure flow rates of different phases in multiphase flow, which means…
Friday, September 16, 1994 4:00 p.m. Dr. Michael F. Pestorius Director, Applied Research Laboratories The Navy is developing a long range, low frequency active (LFA ) sonar. With the demise of the Soviet submarine force, the deep water threat has diminished and the Navy is interested in using LFA in shallow water where exposure of…
Friday, September 9, 1994 4:00 p.m. Members of the Acoustics Faculty Departments of Mechanical Engineering and Electrical Engineering The University of Texas at Austin The purpose of this seminar is to introduce members of the acoustics faculty and their research associates to anyone who is either new at UT or simply curious. Overviews of current…
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…
Friday, April 29, 1994 4:00 p.m. Dr. Michael F. Pestorius Applied Research Laboratories The Navy is developing a long range, low frequency active (LFA) sonar. With the demise of the Soviet Union, the deep water submarine threat is perceived to have diminished and the Navy is interested in using LFA in shallow water where exposure…
Friday, April 22, 1994 4:00 p.m. Dr. Corinne M. Darvennes Department of Mechanical Engineering Tennessee Technological University Delamination sizing in thick composites using ultrasonic techniques is a challenging problem. High frequency waves are needed to provide a sharp image of the defects, but they are attenuated rapidly and do not provide a reliable defect estimate.…
Friday, April 15, 1994 3:00 p.m. John T. Post Electrical and Computer Engineering The University of Texas at Austin Acoustic horns have been used for thousands of years, but only since the pioneering effort of A. G. Webster approximately eighty years ago have horns been studied in a quantitative manner. In this presentation, the improvements…
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…
Friday, March 25, 1994 4:00 p.m. Dr. C. L. Morfey Institute of Sound and Vibration Research University of Southampton United Kingdom Sound transmission through the fuselage of a fully-trimmed aircraft is harder to predict than for the untrimmed “green” aircraft, because of the trim panels and thermal insulation; yet it is desirable that accurate predictions…
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.,…
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…
Friday, 25 February 1994 4:00 p.m. Dennis McFadden Department of Experimental Psychology The University of Texas at Austin In addition to receiving, analyzing, and processing sounds for use by the brain, the inner ear (cochlea) is also able to produce sounds that can be detected with the aid of a small microphone system sealed into…
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…