关键词: 振动与波, 舱壁振动, 舱段, 隔振设计, 声辐射

Abstract:

In order to depress effect of bulkhead vibration on cabin’s vibro-acoustic characteristics, structural-acoustic design of bulkhead was done. According to the theory of damping vibration attenuation, bulkhead was coated with viscoelastic layer for reducing vibration response. As to increase transmission loss, attached back-ring plate was layed between bulkhead and shell applying the principle of impedance mismatch. Vibro-acoustic characteristics of cabin were numerical calculated by FEM/BEM and analyzed the bulkhead’s vibration control effect. The results shows that bulkhead coated with viscoelastic layer and added with attached back-ring plate could not only reduce cabin’s vibration and sound radiation effectively, but also isolated the structure-borne sound to the adjacent cabin significantly. It was a better measure for bulkhead’s vibration damping and noise reduction.