Vibration and noise reduction is an important industrial and environmental technology for comfortable industrial products and safe structures. In this paper, numerical simulations of the damped vibration of a structure with a porous layer sandwiched by a double wall are presented. The cover plate in double-walled structure has a crater type acoustic black hole. A vibration damping material is laminated on the black hole surface. Numerical analysis was carried out using FEM and MSKE methods proposed by Yamaguchi et al. to clarify changes in vibration transmission from the base plate to the cover plate due to the crater type acoustic black holes. The base plate was not affected by the effects of the acoustic black holes. For the cover plate, vibration was transmitted to the acoustic black hole and damping effects were obtained. However, vibration level of this structure in the cover plate is more than that of the structure having two Krylov type acoustic black holes in the cover plate.
MOCHIZUKI et al. (Wed,) studied this question.
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