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Damping Mass Effects on Panel Sound Transmission Loss
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 17, 2011 by SAE International in United States
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The primary function of damping treatment on a vibrating panel in a vehicle is to reduce vibration levels or radiated sound power by the dissipation of energy. However, in automotive applications the mass effects of damping materials should not be ignored, especially with regard to airborne noise performance. In this paper, a Finite Element-Statistical Energy Analysis (FE-SEA) hybrid analysis is used to evaluate the mass effects of applied damping materials on Sound Transmission Loss (STL). The analysis takes into consideration effects on both the elastic properties and modal mass of the panel. It is shown that while uniformly distributing the mass of the damping material over the panel generally over-estimate the mass effects on STL, an area weighting approach underestimates the effects. Results are confirmed by laboratory testing. A nomogram is generated to show the total effect of the mass of the damping material on STL.
CitationWang, C. and Parrett, A., "Damping Mass Effects on Panel Sound Transmission Loss," SAE Technical Paper 2011-01-1633, 2011, https://doi.org/10.4271/2011-01-1633.
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