The Proceedings of the Dynamics & Design Conference
Online ISSN : 2424-2993
2005
Session ID : 315
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315 Damped Vibration Analysis of Automotive Panels Laminated with Viscoelastic Material and Porous Media
Yoshio KUROSAWATakao YAMAGUCHIShuji MATSUMURA
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Abstract
We have developed a technique for estimating damped vibration of automotive body panels with sound-proof structures. It calculates damping properties for sound-proof structures involving elastic body, viscoelastic body and porous media. For elastic and viscoelastic body displacement are modeled using conventional finite elements including complex modulus of elasticity. Both effective density and volume elasticity have complex quantities to represent damped sound fields in the porous media. Particle displacement in the media is discretized using finite element method. Displacement vectors as common unknown variables are solved under coupled condition between elastic body, viscoelastic body and porous media. Further, explicit expressions of modal loss factor for the mixed structures are derived using asymptotic method. Eigenvalue analysis and frequency responded were calculated for automotive panels laminated with viscoelastic body and porous media using this technique, the results almost agreed with the experimental results.
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© 2005 The Japan Society of Mechanical Engineers
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