双层圆柱壳典型基座振动波传递特性优化分析

采用波动分析法,根据不均质结构中的阻抗特性和波型转换,分析振动噪声在典型双层壳结构中的传递特性。以此为切入点,采用有限元/边界元(FEM/BEM)耦合法分析人为构造的传递损失基座的减振降噪性能。通过对组合板振动波的传递特性的分析可以得出,当定常结构发生突变时,结构阻抗也会随之发生变化,导致结构之间的阻抗失配,从而使得振动波在突变截面处发生反射和透射,降低振动波的传递效率,阻隔振动波能量向下游结构传递。然后,据此理论设计了传递损失基座,并用有限元/边界元耦合法验证了传递损失基座的减振降噪性能。

Vibration Wave Propagation Characteristics Optimization Analysis of the Typical Pedestal on Double Cylindrical Shell

According to impedance mismatch and wave mode conversion in heterogeneous structure which based on wave analysis method,the characteristics of vibration wave propagation in typical submarine structure were studied.Based on this,vibration and noise reduction performance of artificial transmission loss base was analyzed through FEM/BEM coupled method.By reviewing vibration wave transmission char acteristics for composite plate,the conclusions are drawn that the structure impedance changes,when the structure cross section mutates.Thus,leading to impedance mismatch between the structures,so the vibra tion wave will reflect and transmit in the mutant cross-section,and reduce the transmission rate of vibra tion.An artificially constructed transmission loss base was designed using the theory,and the vibration and noise reduction performance of the base was verified by FEM / BEM coupled method.