Acoustics and Dynamics

Graduate Study and Research Branch of the

George W. Woodruff School of Mechanical Engineering

at the

Georgia Institute of Technology

Faculty

Facilities

Research
Check out the Integrated Acoustics Laboratory
Other acoustics and vibrations related sites
Go to the Woodruff School's Graduate Program/Admissions Page

Introduction

The School of Mechanical Engineering at Georgia Tech offers graduate programs in Acoustics and Dynamics at the master's and Ph.D. levels. Research in Vibration falls within these categories, as well. The Acoustics and Dynamics research group within the Mechanical Engineering Program includes 5 faculty members who have a primary interest in Acoustics and Dynamics. Interaction among the various members of the group has resulted in an interleaving of collaborative research efforts. An attractive feature of the Graduate Program in Mechanical Engineering is that students may, if they desire, directly enroll in the Ph.D. program without first obtaining a master's degree. The Acoustics and Dynamics research group also maintains ties with several faculty members that are involved in this research area in other schools within the Institute. These other units are Electrical Engineering, Aerospace Engineering, Mathematics, and Architecture, as well as the Georgia Tech Research Institute.

Associated Faculty and Their Research Interests

Academic Faculty

Y. H. Berthelot* Professor, Ph.D., University of Texas at Austin, 1985. Acoustics, laser instrumentation in acoustics, and ultrasonics.

Gary W. Caille Principal Research Engineer and Head, GTRI Systems Program Office. (Joint Appointment as Professor in the Woodruff School). Acoustic radiation and scattering, transduction, shallow water acoustics, submarine structure acoustics, and medical applications of acoustics.

K. A. Cunefare* Professor, Ph.D., Pennsylvania State University, 1990. Active/passive control, fluid-structure interaction, optimal acoustic design, noise control.

Nico F. Declerq* Assistant Professor, Ph.D., Ghent University, 2005. # Periodic media, anisotropic media, nonlinear acoustics, acousto-optics.

F. Levent Degertekin Assistant Professor, Ph.D., Stanford, 1997; Micromachined sensors and actuators, ultrasonics, atomic force microscopy, and nondestructive evaluation

A. A. Ferri* Associate Professor, Ph.D., Princeton University, 1985. Structural dynamics, vibration of nonlinear and frictional systems, shock and vibration isolation, and structural acoustics.

J. H. Ginsberg* George W. Woodruff Chair in Mechanical Systems and Professor, Sc.D, Columbia University, 1970. Vibrations, acoustics, dynamics, and fluid-structure interaction.

Laurence J. Jacobs (Joint CEE/ME) Professor, Ph.D. Engineering Mechanics, Columbia University, New York, NY, 1987. Non-destructive evaluation, wave propagation in solids, experimental mechanics.

I. Green Professor, D.Sc., Technion, Israel Institute of Technology, 1984. Hydrodynamic lubrication, vibrations, rotordynamics, fluid sealing, tribology, design and diagnostics. (GWW page)

Michael J. Leamy* Assistant Professor, University of Michigan, 1998. Dynamics of nanostructured materials, nonlinear dynamics, contact mechanics, multiscale modeling

Thomas E. Michaels (Joint ECE/ME) Associate Professor, Ph.D. Ph.D., Physics, Washington State University, 1972. Measurement technology, ultrasonics, systems and controls.

J. Qu Professor, Ph.D., Northwestern University, 1987. Fracture, composite materials, wave propagation, and microelectronic packaging. (GWW page)

P. H. Rogers* Rae and Frank H. Neely Chair in Mechanical Engineering and Professor, Ph.D., Brown University, 1970. Underwater acoustics, bio-acoustics.

Erica E. Ryherd* Assistant Professor, Ph.D., University of Nebraska, 2006. Noise control, architectural acoustics, healthcare sound scapes, building systems engineering, and psychological/physiological response.

Karim Sabra* Assistant Professor, Ph.D., University of Michigan, 2003. Wave propagation, structural health monitoring, biomechanical systems evaluation, underwater acoustics, and geophysics.

N. Sadegh Associate Professor, Ph.D., University of California, Berkely, 1987. Controls, vibrations, design.

Ben T. Zinn (AE); David S. Lewis, Jr. Chair and Regents' Professor, Ph.D., Princeton University, 1965; NAE. Combustion instability, pulse combustion, propulsion, acoustics.

Professors holding joint appointments are listed with their primary affiliation in parenthesis.

* Denotes a primary interest in Acoustics and Dynamics.

Research Faculty

Van B. Biesel Research Engineer II; M.S., Georgia Institute of Technology, 1993. Acoustics, vibrations, noise control, numerical modeling, transducers, and piezoelectric materials.

John R. Bogle Senior Engineer; M.S., Georgia Institute of Technology, 1987. Structural acoustics, finite/boundary element modeling techniques of the interaction of underwater sound and structures, vibrations.

John Doane Research Engineer II.

Michael Grey Senior Research Engineer and Co-Director, Acoustics and Vibrations Research Laboratory.

Francois Guillot Research Engineer II; Ph.D., Georgia Institute of Technology, 2000. Acoustic material characterization (elastic properties of passive materials, piezoelectric and electrostrictive constants of polymers); measurement methodology; laser doppler vibrometry; electromechanical transduction and structural acoustics.

Gregg D. Larson Research Engineer II; Ph.D., Georgia Institute of Technology, 1996. Transduction, Acoustics, Vibrations, Piezoelectric Ceramics.

James S. Martin Senior Research Engineer; M.S., Georgia Institute of Technology, 1994. Shallow water sound propagation, internal gravity waves, experimental structural acoustics, bioacoustics/biomimetics, nondestructive testing, and nonlinear bubble dynamics.

Dave Trivett Principal Research Scientist, M.S., University of Wisconsin (Madison) 1976, structural acoustics, measurement methodology, transduction mechanisms, acoustic materials, and sonar systems.

Xuezhen Zhang Research Scientist; 1958-1963, Department of Physics of Nanjing University, majored in Physics (3.5 years), and Acoustics (1.5 years. Computational acoustics, shallow-water acoustics.

Ji-Xun Zhou Principal Research Scientist; 1963-1967, Graduate School of Chinese Academy of Sciences, majored in Ocean Acoustics; 1958-1963, Department of Physics of Nanjing University, majored in Physics (3.5 years), and Acoustics (1.5 years). Shallow water acoustics, sound propagation and reverberation, acoustic interactions with internal waves, seafloor acoustics, and acoustic remote-sensing. Click here to see a list of citations.

 

Current and Recent Visiting Researchers

Dr. Victor Rastelli and Dr. Nila Montbrun, Visiting Scholars, Simon Bolivar University, Caracas, Venezuela, 7/00-12/00. Supervised by: Dr. Kenneth A. Cunefare

Dr. Heung-seob Kim, Visiting Scholar, Laboratory for Noise and Vibration Control, School of Mechanical Engineering, Hanyang University, Seoul, Korea. 8/99-7/00. Supervised by: Dr. Kenneth A. Cunefare

Dr. Guangye Chen, Visiting Professor, Ph.D., State Key Laboratory of Vibration, Shock and Noise, Shanghai Jiao Tong University, Shanghai, P. R. China. Supervised by: Dr. Kenneth A. Cunefare

S. De Rosa, Visiting Scholar, Fulbright Scholarship, Aeronautical Engineering, University of Naples, Italy, structural acoustics, statistical energy analysis. 9/96-12/96. Supervised by: Dr. Kenneth A. Cunefare.

Dr. F. Franco, Visiting Scholar, Fulbright Scholarship, Aeronautical Engineering, University of Naples, Italy, structural acoustics, interior/exterior coupling through elastic shells. 3/97-9/97. Supervised by: Dr. Kenneth A. Cunefare

Facilities

Facilities associated with the Acoustics and Vibrations Laboratory within the School of Mechanical Engineering include the acoustic large water tank facility, two laser acoustics laboratories, a bioacoustics laboratory, an atmospheric acoustics propagation modeling facility, and a vibrations laboratory. Facilities available through GTRI include two large anechoic chambers (one of which can be operated as a low-speed wind tunnel) and a laser Schlieren imaging system. Also included with the AVL are the resources of the Integrated Acoustics Laboratory T

he resources of the Integrated Acoustics Laboratory principally are structured about three test rooms: a full anechoic room, a semi-anechoic room, and a reverberation room. The reverberation room and semi-anechoic room are joined by a transmission loss opening. In addition to the test rooms, the Active Control laboratory is an element of the IAL, with resources focused on vibration control research.

Anechoic Room: The interior clear dimensions are 18' x 18' x 14'. The low frequency cutoff of the room is 80 Hz. Provisions exist for installation of an expanded metal floor for heavier test articles.

Semi-anechoic Room: The interior clear dimensions are 19.5' x 25.7' x 14'. The low frequency cutoff is 80 Hz. The semi-anechoic room and the reverb room are joined by an 8' x 8' transmission loss opening.

Reverberation Room: The interior clear dimensions are 27' x 21' x 16.5'. The room is equipped with a rotating boom. Fixed diffusors are currently being qualified per C423 performance. The semi-anechoic room and the reverb room are joined by an 8' x 8' transmission loss opening.

Instrumentation Supporting the Test Rooms

* Anechoic room
o HP VXI data acquisition system with 32 channel 52 kHz A/D, 4-channel arbitrary source, 20 MHz A/D, 16 channel D/A, 4 GB local disk.
o PC workstation as VXI front end, LMS CADA-X system, Matlab acquisition
* Semi-Anechoic Room
o VXI Technology 16 channel data acquisition system, 4-channel arbitrary source
o PC front end with Firewire interface to VXI chassis
* Reverberation Room
o VXI Technology 16 channel data acquisition system, 4-channel arbitrary source
o PC front end with Firewire interface to VXI chassis
* DEC ALPHA analysis workstations (2)
* Software resources include LMS CADA-X, MSC NASTRAN, COMET/Acoustics, LMS SYSNOISE

Related Instrumentation Resources

* Polytec PSV 2000 scanning laser vibrometer
* Large selection of Larson-Davis microphones, preamplifiers, power supplies, calibrators
* Larson-Davis intensity probe, probe calibrators
* Larson-Davis model 824 , 820 and 800B sound level meters
* Large selection of Kistler impact hammers and accelerometers, including tri-axial accelerometers
* LDS exciter systems in 2, 5, 10 and 50 lbf range, and associated power supplies
* Aerodynamic sound power reference source
* Accelerometer and microphone calibrators
* 16 channel TEAC DAT recorder, 8 channel Sony DAT recorder, variety of other recorders.
* Siglab DSP-50 two-channel anlyzer system
* Computer controlled rotational positioner system
* Computer controlled X-Y positioner system

Research

The research programs in Acoustics and Vibrations cover a broad rage of topics with a particular emphasis on structural and underwater acoustics. Annual research funding is currently well above $2,000,000 and almost all graduate students in the Acoustics and Vibrations group receive a stipend in the form of a graduate research assistantship (GRA). Research funding is derived primarily from the Office of Naval Research, the National Science Foundation, NASA, and industries such as Ford, Cummins Engine Co., Lockheed, Newport News Shipbuilding, and Tenneco.

Recent areas of research include:


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