FINITE-ELEMENT ANALYSIS OF STRUCTURAL ACOUSTIC COUPLING IN TIRES

In this paper the formulation used for numerical calculation of the natural frequencies and modes of an axisymmetric structure enclosing an acoustic cavity, essentially as a modification of an existing F.E. structural analysis, is described. The solution for the acoustic pressure in the cavity is obtained as a weighted residual approximation, resulting in only two extra equations to be added to the existing structural equations. The motivation for the exercise came from a desire to perform such an analysis for automobile tyres, where acoustic cavity effects are now known to be of practical consequence. © 1991.