Abstract
Automotive seat structures mainly include metal frames, porous materials and surface materials. There are two media (i.e. internal air and resin block) in the porous materials. By carrying out our model test, the porous materials had sound absorption for cavity resonance. And they also had damping effects for the structural resonance of the metal frame. Under an acoustic excitation, vibration amplitudes of the metal frame increased by attaching the porous materials. It's "an effect of a sail" of the resin block in the porous material, which increases vibration level of the seat metal frame by receiving sound pressure. We also observed the similar phenomena when a thin leather sheet is covered on the foam with the metal frame.
