hamilton@mail.utexas.edu – Page 2

Approach for Designing Broadband Transducer Systems and Evaluation of Various Cylindrical Transducer Technologies

Wednesday, February 10, 2016 1:30 p.m. in ARL Conference Room 1 Dr. Corey Bachand BTech Acoustics LLC Barrington, Rhode Island http://www.btechacoustics.com/ Underwater transducers for broadband communication rely on effective tuning and matching to a power amplifier for maximum signal bandwidth and efficiency. This analysis follows a systematic approach to design an efficient and effective broadband…

February 10, 2016hamilton@mail.utexas.eduAcoustics Seminars

Acoustics of Fine-Grained Marine Sediments

Friday, January 29, 2016 4:00 p.m. in ETC 4.150 Dr. Megan S. Ballard and Dr. Kevin M. Lee Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu While the acoustics of granular marine sediment has been extensively studied, less attention has been paid to the physics of acoustic propagation in fine-grained muddy sediment. Our…

January 29, 2016hamilton@mail.utexas.eduAcoustics Seminars

Acoustic Scattering from Ocean Sediment Surfaces

NONLINEAR DYNAMICS SEMINAR Monday, 25 January 2016, 1:00 p.m. RLM 11.204 Dr. Marcia Isakson Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu Visible light scatters from molecules in the atmosphere, giving the sky its blue color. Subatomic molecules can scatter from each other in particle accelerators. Here we examine acoustic scattering from the…

January 25, 2016hamilton@mail.utexas.eduAcoustics Seminars

The Dense Plasma That Forms Inside a Sonoluminescing Bubble

PHYSICS DEPARTMENT COLLOQUIUM AND ACOUSTICS SEMINAR Wednesday, November 18, 2015 4:00 p.m. in RLM 4.102 Professor Seth Putterman Department of Physics University of California, Los Angeles http://acoustics-research.physics.ucla.edu/ The passage of a sound wave through a fluid with a bubble leads to pulsations that are so nonlinear that acoustic energy is concentrated by 12 orders of magnitude…

November 18, 2015hamilton@mail.utexas.eduAcoustics Seminars

Nonlinear Internal Waves and Coastal Ocean Acoustics: Are We There Yet?

Monday, November 9, 2015 1:00 p.m. in RLM 11.204 Dr. James F. Lynch Woods Hole Oceanographic Institution Woods Hole, Massachusetts http://www.whoi.edu Chinese experiments in the late 1980’s-90’s showed that the interaction of low frequency (10-1000 Hz) sound with nonlinear coastal internal waves (soliton trains) could cause a 40 dB drop in sound intensity due to scattering.…

November 9, 2015hamilton@mail.utexas.eduAcoustics Seminars

Transmission Matrices: Introduction and Application

Friday, October 30, 2015 4:00 p.m. in ETC 4.150 David A. Nelson, INCE Bd. Cert., PE Nelson Acoustics Elgin, Texas http://nelsonacoustical.com Layered systems present both challenge and opportunity in noise control. The equations for a handful of basic situations are worked out in engineering texts, but the number of situations encountered in practice drives a need…

October 30, 2015hamilton@mail.utexas.eduAcoustics Seminars

Tour of the Knicker Carillon atop the UT Tower

Friday, October 23, 2015 3:30 p.m. to 4:30 p.m. Samuel K. Hord Department of Mechanical Engineering The University of Texas at Austin https://www.utexas.edu/tours/mainbuilding/carillon/ http://www.dailytexanonline.com/news/2013/04/16/tower-carillon-bells-ring-after-months-of-silence A carillon is a set of at least 23 bells that are sounded by clappers controlled by a keyboard and foot pedals. The Kniker Carillon atop the UT Tower was installed…

October 23, 2015hamilton@mail.utexas.eduAcoustics Seminars

Call of the Wild Tiger: Exploring Acoustic Monitoring of Wild Tiger Populations

Friday, October 16, 2015 4:00 p.m. in ETC 4.150 Courtney Dunn, Director The Prusten Project Dallas, Texas http://www.theprustenproject.org Development of new methods of remote monitoring is essential for more efficient as well as minimally disruptive census of species where dense jungle prohibits visual confirmation. This is particularly important for Panthera tigris, whose populations have plummeted…

October 16, 2015hamilton@mail.utexas.eduAcoustics Seminars

Technology; Process; People: Generating Engineering Solutions to Wicked Problems and Accommodating Complex Construction Realities of Performance Venue Projects

Friday, October 9, 2015 4:00 p.m. in ETC 4.150 Craig Janssen, Managing Director Idibri Dallas, Texas http://www.idibri.com/ Projects can be separated into phases of needs analysis, engineered solution and implementation. These simple phases belie the tremendous difficulty experienced in design and construction projects for performance venue facilities, and undersell the complexity of human dynamics required…

October 9, 2015hamilton@mail.utexas.eduAcoustics Seminars

Twenty-four Days, Twenty-three Scientists, One Research Vessel and the New England Mud Patch: An Ocean Acoustics Travelogue

Friday, September 25, 2015 4:00 p.m. in ETC 4.150 Dr. Kevin M. Lee and Professor Preston S. Wilson Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu/ In July and August of 2015, twenty-three scientists conducted a series of measurements and scientific data collection operations on the research vessel Hugh R. Sharp, about 6o…

September 25, 2015hamilton@mail.utexas.eduAcoustics Seminars

Analysis of Acoustic Scattering from Large Fish Schools Using Bloch Wave Formalism

Friday, September 18, 2015 4:00 p.m. in ETC 4.150 Dr. Jason A. Kulpe Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu/ In the open ocean, scattering of sonar signals in the 1-10 kHz frequency range is dominated by large fish schools, where multiple scattering effects between the air-filled swim bladders of the fishes…

September 18, 2015hamilton@mail.utexas.eduAcoustics Seminars

Noise Control in the Energy Industry

Friday, September 11, 2015 4:00 p.m. in ETC 4.150 Benjamin J. Copenhaver ATCO Emissions Management Katy, Texas http://www.atcoem.com/ While natural gas and coal fired power plants are responsible for generating a significant portion of the energy consumed in the U.S., they can also generate a significant amount of noise. Firms specializing in industrial acoustics, such…

September 11, 2015hamilton@mail.utexas.eduAcoustics Seminars

Metastructure-Based Passive Phased Acoustic Array

Friday, September 4, 2015 4:00 p.m. in ETC 4.150 Dr. Likun Zhang Center for Nonlinear Dynamics Department of Physics, The University of Texas at Austin http://chaos.utexas.edu/ Many practical applications, including ultrasound engineering and auditorium acoustics, require formation of sound fields with specific wave fronts. Conventional phased source arrays composed of an array of elementary sources with…

September 4, 2015hamilton@mail.utexas.eduAcoustics Seminars

Measurements of Three-Dimensional Acoustic Propagation over a Translationally Invariant Wedge and in a Scale-Model Canyon

Friday, May 1, 2015 4:00 p.m. in ETC 4.150 Dr. Jason Sagers Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu/ Scale model (1:7500) acoustic propagation experiments were conducted in a laboratory tank to investigate three-dimensional (3D) propagation effects induced by range-dependent bathymetry, with the objective of providing benchmark quality data for comparison with numerical models. A computer-controlled…

May 1, 2015hamilton@mail.utexas.eduAcoustics Seminars

Phonemic Perception Training in Quiet and Noise of English Speech for Chinese College Students

Friday, April 24, 2015 4:00 p.m. in ETC 4.150 Professor Chang Liu Department of Communication Science and Disorders The University of Texas at Austin http://csd.utexas.edu/ The goal of this study is to examine two hypotheses of our previous studies on English speech perception of Chinese college students, who had similar performance in English vowel identification in quiet and…

April 24, 2015hamilton@mail.utexas.eduAcoustics Seminars

A New Methodology for Quantifying Acoustic Wavefronts on Clustered Rocket Nozzles

Friday, April 10, 2015 4:00 p.m. in ETC 4.150 Andres Canchero Aerospace Engineering & Engineering Mechanics The University of Texas at Austin https://www.ae.utexas.edu/ A new methodology for quantifying acoustic wavefronts is proposed in the present study. Retroreflective shadowgraphy visualizations during the start-up of a cluster of two high area ratio rockets are being used to analyze particular…

April 10, 2015hamilton@mail.utexas.eduAcoustics Seminars

A Two-Way Coupled Mode Formalism that Satisfies Energy Conservation for Impedance Boundaries in Underwater Acoustics

Friday, April 3, 2015 4:00 p.m. in ETC 4.150 Dr. Steven A. Stotts Applied Research Laboratories The University of Texas at Austin www.arlut.utexas.edu This paper shows that energy conservation and the derivation of the two-way coupled mode range equations can be extended in three dimensions to complex mode functions and eigenvalues. Furthermore, the energy in the coupled mode formulation…

April 3, 2015hamilton@mail.utexas.eduAcoustics Seminars

Experience-Dependent Plasticity in the Subcortical Encoding of Speech Signals

Friday, March 27, 2015 4:00 p.m. in ETC 4.150 Professor Bharath Chandrasekaran Department of Communication Science & Disorders The University of Texas at Austin csd.utexas.edu Speech is the most important acoustic signal for humans. Our brain is able to simultaneously extract “what” is being said (referred to as lexical information) and “who” is speaking (referred to as indexical…

March 27, 2015hamilton@mail.utexas.eduAcoustics Seminars

Wind Turbine Noise Regulations

Friday, March 6, 2015 4:00pm in ETC 4.150 David A. Nelson, INCE Bd. Cert., PE Nelson Acoustics Elgin, Texas http://www.nelsonacoustical.com The common conception of an environmental noise criterion is a lone dB(A) value. It’s easy to remember, measure, and litigate. But depending on the type of noise, it might not correlate with community experience. And…

March 6, 2015hamilton@mail.utexas.eduAcoustics Seminars

Acoustic Metamaterials

Friday, February 20, 2015 4:00 p.m. in ETC 4.150 Romain Fleury Electrical and Computer Engineering Department The University of Texas at Austin http://www.ece.utexas.edu/ Metamaterials are artificially structured materials that are engineered to interact with waves in anomalous or extraordinary ways, leading to unconventional physical phenomena not found in natural materials, such as negative refraction and cloaking. They…

February 20, 2015hamilton@mail.utexas.eduAcoustics Seminars

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Author: hamilton@mail.utexas.edu