Plenary Speakers for Noise-Con and NCAD
Sean F. Wu, Ph. D.
University Distinguished Professor
Department of Mechanical Engineering
Wayne State University
Detroit, MI 48202
U.S.A
Sean F. Wu received his BSME from Zhejiang University (China) in 1982, MSME in 1984 and Ph.D. in 1987, both from Georgia Institute of Technology, U.S.A. Dr. Wu joined Mechanical Engineering Department at Wayne State University (WSU) as an Assistant Professor in 1988. He was appointed to a tenure-track Assistant Professor in 1990, promoted to Associate Professor in 1995 and Professor in 1999, named the Charles DeVlieg Professor of Mechanical Engineering in 2002, and appointed by the Board of Governors to the rank of University Distinguished Professor in 2005. Dr. Wu holds the rank of Fellow in the Acoustical Society of America (ASA), and the American Society of Mechanical Engineers (ASME). Currently, he serves as an Associate Editor for the Journal of the Acoustical Society of America (JASA) and Co-Editor-in-Chief for the Journal of Computational Acoustics (JCA). Dr. Wu is a Co-Founder and the Chief Technology Officer of SenSound, LLC.
Dr. Wu’s areas of interest are in acoustics, vibration, and noise control.
Abstract: Overview of Nearfield Acoustical Holography and its Comparison to Other Technologies
An overview of nearfield acoustical holography (NAH) and its implementations together with its comparison with other technologies such as transfer path analysis (TPA), intensity probe scanning, and beamforming are presented. Specifically, planar NAH, boundary element method (BEM) and Helmholtz equation least squares (HELS) method based NAH and their respective advantages and limitations are discussed. The presentation is structured with strong consideration towards applications in the auto industry. Specific examples of reconstruction of all the acoustic quantities, which include the acoustic pressures, particle velocities, and acoustic intensities in 3D space and on 3D surfaces inside full-size vehicles, identification of sound transmission paths into a passenger vehicle compartment, and disk brake squeals analyses are presented. Comparisons of NAH and TPA, intensity probe, and beamforming techniques are presented, and their advantages and limitations as noise diagnostic tools are discussed. It is hoped that a good understanding of various technologies will ultimately enable users to come up with optimal solutions to tackle a variety of complex noise problems facing the practicing engineers.
G. Richard Price, Ph. D.
Auditory Hazard Analysis
POB 368
Charlestown, MD 21914
USA
Dr. Price received a BS degree in psychology from the University of Delaware in 1960 and a Ph.D. in physiological psychology from Princeton University in 1963. He spent 36 years of his research life at the Human Research and Engineering Directorate of the US Army Research Laboratory and retired as Senior Research Scientist (ST) in 1999. He has continued work as a consultant on the effects of noise on hearing and performance since that time. He has been a Princeton National Fellow, a National Institute of Mental Health Fellow, a LABCOM Fellow, an ARL Fellow, a Fellow of the Acoustical Society of America and was selected as Outstanding Hearing Conservationist by the National Hearing Conservation Association in 2007. Dr. Price has served on technical committees in the National Academy of Sciences, NATO, and on SAE and ANSI standards committees.
His research in audition has produced an understanding of the mechanisms of hearing loss from intense sounds, which has led to the auditory hazard assessment algorithm for the human (AHAAH), the basis for risk assessment by the SAE and the US Army. Dr. Price also initiated programs quantifying and predicting the effect of changes in hearing on soldier performance to include the detection and identification of sounds as well as the effect on crew and system performance. Dr. Price’s research team also modeled the processes associated with the propagation, detection and identification of sounds. This work impacts the development of improved target detection capabilities and acoustic camouflage and is the basis for the Army’s non-detectability criterion.
Abstract: AHAAH: A mechanically-based, damage assessment for auditory hazard from intense sound.
Treating the ear as a ”black box” may make for simpler hazard measures; but it does not produce insight into the loss processes or arguably, the most efficient remedies. The Auditory Hazard Assessment Algorithm for the Human (AHAAH) is an electro-acoustic analog of the ear developed at the Army Research Laboratory. In it, hazard at high levels, typical of gunfire, is calculated by following displacements of the basilar membrane in the inner ear, and summing their effects at roughly 1/3 oct intervals. The resultant value is in Auditory Risk Units, which have been shown to correlate very highly with shift in the ear’s sensitivity and cellular loss. A “movie” of the loss in the inner ear permits a time-domain analysis of the effect of the noise, which can in turn suggest palliative measures that are practical and novel. The AHAAH model is presently used by the Society of Automotive Engineers (airbag noise hazard) and the US Army, and it is being considered as a possible ANSI standard for impulse noise exposure. The basis for and limitations of the model will be presented and discussion will focus on the range of its applicability and the possibilities associated with extending a physiologically oriented time-domain analysis to lower sound pressure levels, typical of industrial noises.
Martin L. Pollack, Ph. D.
Corporate Scientist
Applied Physical Sciences Corp.
Groton, Connecticut
U.S.A
Dr. Pollack is the Corporate Scientist at Applied Physical Sciences (APS) Corporation. He received his BS in Aerospace Engineering from Polytechnic Institute of Brooklyn in 1972, his MS in Applied Mechanics from Polytechnic Institute of Brooklyn in 1973, and his PhD in Applied Mechanics from Polytechnic Institute of Brooklyn in 1975. Prior to joining APS, Dr. Pollack served as Senior Advisory Engineer in Acoustics & Technology Integration at the Lockheed Martin Knolls Atomic Power Laboratory (KAPL). He was responsible for methods development and validation in the areas of structural acoustics, fluid acoustics, and fluid-structure interaction, and for the integration of those methods into the design process. Dr. Pollack was responsible for the acoustic design of several propulsion systems, including the integration of advanced technology into the process. He also has extensive experience in machinery and system silencing.
At APS, Dr. Pollack has been responsible for developing advanced methods for predicting the acoustic performance of motors and actuators. He is heavily involved in both the methods development and in their validation with test data. Dr. Pollack has also developed physics based models for the dynamic performance of Air Cushion Vehicles. He is Participating Faculty at Union Graduate College and a Fellow of ASME. Dr. Pollack was the 2001-2002 Chair of the ASME Noise Control & Acoustics Division.
Abstract: A History of the ASME Noise Control and Acoustics Division (NCAD)
In 1978, the idea emerged of establishing a Division within ASME to focus on noise control and acoustics. Since then the Noise Control and Acoustics Division (NCAD) has evolved into a strong organization with focused technical committees, extensive technical sessions at its annual meetings, tutorials and invited lectures, and a journal serving to disseminate key information through peer reviewed technical papers. An overview of the history and evolution of NCAD is presented in this lecture. The growth in scope and membership of the division is described, along with the diversity of organizations involved. Major technical thrusts of NCAD are discussed, as well as its organization structure. Key technical contributions by NCAD members are highlighted, and select past Rayleigh lectures and tutorials are revisited. NCAD participation in the Journal of Vibration and Acoustics, and interaction with other acoustics professional societies are summarized. An overview of the current NCAD Division is provided, including its organization structure and view to the future.
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