複数の波動ブラックホールを側辺固定カバープレートに持つ吸音二重壁のMSKE法制振解析

抄録

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 two Krylov-type acoustic black holes. The other side edges of the wall are fixed. Vibration-damping materials are installed on the black hole surfaces. Numerical analysis was performed using the FEM and MSKE methods proposed by Yamaguchi et al. to clarify the changes in vibration transmission from the base plate to the cover plate due to multiple 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 holes and damping effects were obtained. It can be seen that fixing the cover plate increased the damping effects in the low-frequency band and decreased the damping effects of the acoustic black hole in the high-frequency band.