A novel method of combining modal synthesis and residual flexibility for structure and boundary elements for fluid to compute the acoustic pressures in an enclosed cavity that might have application in automotive industry is studied. Traditionally in the automotive industry, both the fluid cavity and the enclosing flexible structure are modeled using finite elements to find the acoustic pressures. A method is proposed where the flexible structures such as automotive panels are modeled using finite elements available in any commercial software packages and fluid cavity is modeled using boundary elements. This approach substantially reduces modeling and computing effort required for fluid cavity. Modal synthesis and residual flexibility vectors to account for the truncated higher frequency modes of the flexible interacting structure are utilized to improve the accuracy. Results of the new technique are compared against two other methods, namely, direct frequency method and the case where both the structure and the fluid are modeled using finite elements.
Structural-acoustic mode synthesis for vehicle interior using finite-boundary elements with residual flexibility
Neues Verfahren kombiniert Modalsynthese und Rand-Elemente-Methode
International Journal of Vehicle Design ; 23 , 1/2 ; 191-202
2000
12 Seiten, 3 Bilder, 1 Tabelle, 27 Quellen
Aufsatz (Zeitschrift)
Englisch
Vehicle interior acoustic design using finite element methods
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