About Me

I am a Research Professor at the Applied Research Lab (ARL) at Penn State. I acquire funding for and direct computational and experimental structural- and flow-acoustic projects for the US Navy, the US Nuclear Regulatory Commission, NASA, and private industry.

I also am the Director of Penn State's Center for Acoustics and Vibration.

Finally, I am a Professor in the Penn State Graduate Program in Acoustics and teach Sound-Structure Interaction and customized short courses in Vibration and Sound and Flow-Induced Noise and Vibration to industry and government.

For more details download my full resume


Biography

I am:

a Professor in the Penn State Graduate Program in Acoustics

Director of Penn State's Center for Acoustics and Vibration (CAV)

Research Professor in the Fluid Dynamics and Acoustics Office at the Applied Research Lab (ARL/Penn State)



Education

D.Sc. Mechanical Engineering, 1996, the George Washington University,
Thesis topic: Formulations and Methods for Robust and Efficient Optimization of Acoustic Radiated Noise Problems

M.S. Mechanical Engineering, 1987, Virginia Tech,
Thesis topic: Structural Shape Optimization of 3D Finite Element Models

B.S. Mechanical Engineering, 1986, Virginia Tech.



Professional Affiliations

Fellow, Institute for Noise Control Engineering (INCE)

Fellow, American Society of Mechanical Engineering (ASME), Member and past President of ASME Noise Control and Acoustics Division

Vice President for the Americas, International INCE

International Organizing Committee for the NOVEM (Noise and Vibration EMerging Methods) and FLINOVIA (FLow Induced NOise and Vibration Issues and Aspects) conference series.

Research

Some brief examples of my research interests are shown below. See my publications and resume for more details.

Structural Vibration

A flat plate mode of vibration. Here, the edge boundaries are simply supported, and the mode is a (2,2) mode, with two half waves spanning each plate direction.

My group performs experimental and computational modal analyses on complex structures. The modes are the fundamental basis of forced vibration and sound analyses.

Sound Radiation

A plate mode of vibration (bottom) radiates a spatially varying sound field. I teach vibration and radiated sound theory in Penn State's Sound-Structure Interaction graduate course.

I have also investigated many computational and experimental ways to model and measure radiated sound.

Flow Induced Noise and Vibration

Wall pressures induced by turbulent shear flow from an upstream nozzle wash over a plate. These pulsations can be strong enough to cause structural fatigue cracking and failure.

I have also investigated flow induced vibration and noise caused by turbulent boundary layers, ingested turbulence, and jets.

Noise Control

A sound wave on the left strikes a noise barrier, which vibrates and radiates a weaker sound wave to the right. You can learn more about this problem in the sound transmission loss tutorial below.

I have also designed noise control treatments like viscoelastomers for structural damping, composite sound barriers, particle impact dampers; and developed methods to optimize structural shapes and treatments for reduced vibration and sound radiation.

Here is a video recorded by International INCE (Institute for Noise Control Engineering) of my talk on Flow Induced Noise and Vibration at the 2017 Hong Kong Internoise. After some preliminaries about the 2017 Flinovia II Symposium held at Penn State in May 2017 is my attempt to summarize this field, drawing from work by symposium authors. Here is the paper that accompanies this talk. A proceedings book on FLINOVIA II has been published by Springer - see the link in the Publications section below.

Publications

Below are links to my books, tutorials, and some NASA Contractor Reports. You can find the rest of my journal and conference publications on my Google Citations page

Engineering Vibroacoustics

I co-edited/co-wrote this book, published as part of Wiley's Book Series on Acoustics, with Don Nefske and Sue Sung. The book includes 15 chapters ranging from the basics of structural vibration and radiated sound to numerical methods and noise control treatments. You can buy it through Amazon

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1st Flinovia Proceedings

My colleagues from Italy and France and I organized the first Symposium on Flow Induced Noise Issues and Aspects in Rome, Italy in November 2013. The book includes 15 papers by world-renowned experts in this field, available on Amazon. You can also download individual chapters at the Springer website.

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2nd Flinovia Proceedings

We held the second Symposium on Flow Induced Noise Issues and Aspects at Penn State in April 2017. The 2nd edition includes 22 papers, available on Amazon. You can also download individual chapters at the Springer website.

Structural-Acoustics Tutorial Part 1

I wrote my first tutorial on structural acoustics for Acoustics Today, at the request of founding editor Dick Stern. It covers the basics of waves in structures, modes of vibration, mobility and impedance, infinite structure theory, structural damping, and finite element analysis. Download it here.

Structural-Acoustics Tutorial Part 2

I collaborated on the second Structural Acoustics Tutorial with my Penn State colleague, Dr. John Fahnline, well known acoustic boundary element expert. We explain the basics of sound radiation, radiation efficiency and damping, sound transmission loss, and boundary element analysis. Download it here.


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Tutorial on Sound Transmission Loss Simulations

This tutorial expands on sound transmission loss simulations and was presented at the 2015 Internoise in San Francisco (sponsored by the International Institute of Noise Control Engineering (I-INCE). Download it here.

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Tutorial on Vibroacoustics of Composite Sandwich Panels

This tutorial draws from my group's work on quieting composite sandwich panels, covering bending wavespeeds, structural modes of vibration, mobility, damping, and radiation efficiency. Download it here.

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Tutorial on Wavenumber Transforms of Vibrations

I have found that students have difficulty understanding wavenumber transformations. This tutorial includes some animations and discussion to demystify this concept. Download it here.

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Rotorcraft Transmission Noise Path Model

This is a summary of work for NASA Glenn on how fluid film bearings affect structure-borne noise transmission in gearboxes, including numerical models and measurements. Download it here.

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Acoustically Tailored Composite Rotorcraft Fuselage Panels

This is a summary of work for NASA Langley on reducing sound transmission through rotorcraft roof panels, once again including numerical models validated with measurements. Download it here.

contact me

Interested in sponsoring research or a graduate student, taking Acoustics classes at Penn State, or arranging for a customized short course for you or your group? Please contact me using the coordinates below.

contact information