Friday, April 26, 2013 4:00 p.m. in ETC 4.150 Professor Philip J. Morris Department of Aerospace Engineering The Pennsylvania State University http://www2.aero.psu.edu/morris/ The noise generated by modern tactical fighter aircraft can cause noise-induced hearing loss in personnel located near the aircraft and annoyance in communities surrounding military bases. This is a special problem for the…
Friday, April 26, 2013 1:00 p.m. in ACES 4.304 Woutijn J. Baars Department of Aerospace Engineering The University of Texas at Austin http://www.ae.utexas.edu/ A scaling model based on the Gol’dberg number is proposed for predicting the presence of cumulative nonlinear distortions in acoustic waveforms produced by high speed jets. Two acoustic length scales, the shock…
Friday, April 19, 2013 4:00 p.m. in ETC 4.150 Dr. Armen Sarvazyan Artann Laboratories, Inc. www.artannlabs.com In this presentation, a wide range of topics related to biomedical applications of acoustics, ranging from diagnostic imaging and biosensors to ultrasound-enhanced drug delivery and time-reversed acoustics, will be demonstrated. For example, Artann Laboratories has developed a family of ultrasonic devices…
Friday, April 12, 2013 4:00 p.m. in ETC 4.150 Professor Zheng Wang Department of Electrical & Computer Engineering The University of Texas at Austin www.ece.utexas.edu/ Coherent acoustic waves at ultrahigh frequencies (5‑100GHz) promise a wide range of on-chip applications, from microwave signal buffering/processing to nano‑imaging. We produce such ultrahigh frequency acoustic waves using guided‑wave nanophotonic…
Friday, March 29, 2013 4:00 p.m. in ETC 4.150 Professor Preston S. Wilson Applied Research Laboratories Department of Mechanical Engineering The University of Texas at Austin http://www.arlut.utexas.edu/ The shallow water ocean environment can be quite complicated acoustically, in part due to the abundance of multiphase materials, such as air bubbles in water near the ocean…
Friday, March 8, 2013 4:00 p.m. in ETC 4.150 Professor Yong-Joe Kim Department of Mechanical Engineering Texas A&M University http://www.mengr.tamu.edu/ Microfluidic, acoustophoretic cell/particle separation has gained significant interest recently. In order to analyze the motion of cells/particles in the acoustophoretic separation, a one-dimensional (1-D) analytical model in a “static” fluid medium has been widely used, while the…
Friday, March 1, 2013 4:00 p.m. in ETC 4.150 Donghwan Kim Department of Electrical & Computer Engineering The University of Texas at Austin http://www.ece.utexas.edu/ Small-scale piezoelectric energy harvesters (PEH) have been the subject of recent investigations. Previously the power output of MEMS PEHs was considered too small to operate a sensor, but advances in lowering…
Friday, February 15, 2013 4:00 p.m. in ETC 4.150 Dr. Marcia J. Isakson and Dr. Nicholas P. Chotiros Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu Acoustic interaction with the ocean bottom is a critical part of understanding propagation in shallow water environments. However, most ocean propagation models consider the seafloor as flat or use approximations to determine the…
Friday, February 8, 2013 4:00 p.m. in ETC 4.150 Professor Jinying Zhu and Xiaowei Dai Department of Civil, Architectural and Environmental Engineering The University of Texas at Austin http://www.caee.utexas.edu Air‑coupled sensing has shown great potential for rapid nondestructive sensing and scanning of concrete infrastructure. However, the current air‑coupled sensing method has two limitations: (1) the air‑couple sensor (a…
Friday, February 1, 2013 4:00 p.m. in ETC 4.150 Dr. Kevin M. Lee Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu/ and Dr. Mark S. Wochner AdBm Technologies, LLC http://adbmtech.com Arrays of large encapsulated bubbles have been shown to be very effective at reducing underwater sound radiated from various sources. These arrays provide noise reduction using the combined effects of…
Friday, January 25, 2013 4:00 p.m. in ETC 4.150 Nicholas P. Chotiros and Marcia J. Isakson Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu/ The seabed is often modeled as a fluid, visco-elastic solid, or water-saturated poro-elastic material. Using experimental measurements from a sandy seabed, it is shown that the poro-elastic model can…
Saturday, December 8, 2012 1:00 p.m. at ETS-Lindgren Dr. Douglas F. Winker ETS-Lindgren 1301 Arrow Point Drive Cedar Park, Texas http://www.ets-lindgren.com/Acoustics In 2002, ETS-Lindgren acquired Acoustic Systems of Austin, Texas, and in doing so, expanded their test and measurement capabilities to include the Acoustic Systems Acoustical Research Facility on Saint Elmo Road in South Austin.…
Thursday, December 6, 2012 3:30 p.m. in WRW 113 Professor Jonathan B. Freund Department of Mechanical Science and Engineering Department of Aerospace Engineering University of Illinois at Urbana-Champaign http://jbfreund.mechse.illinois.edu We will review the underlying theory for how turbulence makes sound and use that to motivate detailed simulation-based investigation of jet noise mechanisms. High-fidelity sub-sonic noise…
Friday, November 30, 2012 4:00 p.m. in ETC 4.150 Kyle S. Spratt Applied Research Laboratories and Department of Mechanical Engineering The University of Texas at Austin http://www.arlut.utexas.edu/ http://www.me.utexas.edu/ In the past decade there has been an increasing interest in the optics literature regarding the unique characteristics of focused, radially-polarized light beams. Of particular interest is…
November 9, 2012 4:00 p.m. in ETC 2.136 Professor Brady R. Cox Department of Civil, Architectural and Environmental Engineering The University of Texas at Austin http://www.caee.utexas.edu/technical-areas/geotechnical-engineering.html Topographic effects, in the context of earthquake engineering, refer to a commonly recognized phenomenon that causes amplification and frequency alteration in ground motions measured in the vicinity of a topographic…
Thursday, November 1, 2012 3:00 p.m. in ARL Auditorium Dr. Charles W. Holland Applied Research Laboratory The Pennsylvania State University http://www.arl.psu.edu/ One of the difficulties in validating sediment models has been the lack of reliable low frequency dispersion measurements. A reflection method is presented that yields in situ dispersion without sediment disturbance over a broad…
Friday, October 12, 2012 4:00 p.m. in ETC 4.150 Dr. Likun Zhang Department of Physics and Center for Nonlinear Dynamics The University of Texas at Austin http://chaos.utexas.edu Acoustic beams can exert radiation forces on objects, allowing, for example, manipulation of cells in suspension, assessment of viscoelastic properties of biological tissues, and targeted drug and gene…
Friday, October 5, 2012 4:00 p.m. in ETC 4.150 Michael Kuntzman Department of Electrical and Computer Engineering The University of Texas at Austin http://www.ece.utexas.edu/ http://www.utmems.com/ Since being commercialized less than a decade ago, the microelectromechanical systems (MEMS) microphone market has seen dramatic growth, with 1 billion units shipped in 2011 and global shipments projected to…
Friday, September 28, 2012 4:00 p.m. in ETC 4.150 Dr. Thomas G. Muir Applied Research Laboratories The University of Texas at Austin www.arlut.utexas.edu Musical acoustics has fascinated the intellect of man since pre-historic time, when tunes were played on flutes made from feathers and of bone, as well as lyres made from yokes, turtle shell resonators,…
Friday, September 21, 2012 4:00 p.m. in ETC 4.150 Dr. Bret Pasch Section of Integrative Biology The University of Texas at Austin www.biosci.utexas.edu/ib Many animals use long-distance acoustic signals to advertise their presence to a network of potential mates and competitors. A rich tradition of studies on acoustic communication in birds, anurans, and insects has provided…