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Determining Vibro-Acoustic Characteristics and Structural Damping of an Elastic Monolithic Panel
Technical Paper
2019-01-1538
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Evaluations of the dynamic and acoustic responses of panels, partitions, and walls are of concern across many industries, from building home appliances, planning meeting rooms, to designing airplanes and passenger cars. Over the past few decades, search efforts for developing new methodologies and technologies to enable NVH engineers to acquire and correlate dynamically the relationship between input excitations and vibro-acoustic responses of arbitrary-shaped panels has grown exponentially. The application of a particular methodology or technology to the evaluation of a specific structure depends intimately on the goals and objectives of the NVH engineers and industries. In this work, we present the comparisons between the traditional modal analyses for structural vibrations together with sound intensity measurements of sound radiation and a laser-assisted Helmholtz equation least squares (HELS) method [1, 2, 3, 4] to characterize the dynamic and acoustic responses of an arbitrarily shaped structure subject to non-contact acoustic excitations. Input data for the latter include the normal surface velocities measured at a finite number of points on the surface of the structure that are accessible to a laser beam, and the acoustic pressures measured at a few points in the near field. With these input data, we will be able to reconstruct the normal surface velocity, the surface acoustic pressure, the normal surface acoustic intensity distributions over the entire structure, dimensionless structural damping ratio spectrum, sound transmission losses (STL), and sound transmission paths, etc. These data enable engineers to acquire a comprehensive understanding of the vibro-acoustic characteristics of any arbitrarily shaped vibrating structure, which can lead to the most cost-effective NVH reduction.
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Figueroa, A., Wu, S., and Chen, L., "Determining Vibro-Acoustic Characteristics and Structural Damping of an Elastic Monolithic Panel," SAE Technical Paper 2019-01-1538, 2019, https://doi.org/10.4271/2019-01-1538.Data Sets - Support Documents
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References
- Wu , S.F. The Helmholtz Equation Least Squares Method-For Predicting and Reconstructing Acoustic Radiation New York, NY Springer 2015 10013
- Wang , Z. and Wu , S.F. Helmholtz Equation-Least Squares (HELS) Method for Reconstructing the Acoustic Pressure Field Journal of the Acoustical Society of America 102 4 2020 2032 1997
- Wu , S.F. Methods for Reconstructing Acoustic Quantities Based on Acoustic Pressure Measurements Journal of the Acoustical Society of America 124 2680 2697 2008
- Wu , S.F. , Moondra , M. , and Beniwal , R. Analyzing Panel Acoustic Contributions Toward the Sound Field Inside the Passenger Compartment of A Full-Size Automobile Journal of the Acoustical Society of America 137 2101 2112 2015
- Carmichael , S. Estimating Damping Values Using the Half Power Method Integrated Systems Research, Inc. April 2015
- Pierce , A.D. Acouctics: An Introduction to Its Physical Principles and Applications New York McGra-Hill 1981