多转角结构中转角处附加的阻振质量对结构波传递的抑制(英文)

Structure-borne Sound Attenuation in A Multi-corner Structure with Attached Blocking Masses

应用波分析法研究在由平板构成的多转角结构中附加阻振质量对结构声传递的抑制作用。通过引入由半无限长板构成的转角处的透射及反射系数来求解在弯曲波及纵波入射条件下多转角结构中各板内不同形式波的波动表达式,避免了求解复杂的偏微分方程组,从而简化了分析,并在此基础上推导出附加两条阻振质量的双转角结构的能量透射效率。文中同时还进行了模拟船舶结构的简化模型的实验,验证了数值计算得出的一些规律。研究表明:附加在双转角结构的转角处的阻振质量不仅在高频区对结构声的传递有很好的抑制效果,而且还能显著增加两阻振质量之间的有限长板的一阶共振频率处的传递损失。

The attenuation effects of attached blocking masses on a multi-comer structure are investigated by wave approach. Transmission and reflection coefficients of single-comer structure consisting of two semi-infinite plates are used to deduce expressions of wave motion in such multi-corner structure, which avoids solving partial differential equations and simplifies analysis. Equations governing wave motions are then applied to deduce energy transmission and reflection efficiencies of double-comer structure. The experiment on a simplified test sample analogous to the hull of a ship, was also carried out to validate the results from numerical computation. And it is revealed that blocking masses attached at the two comers of double-comer structure can not only provide more attenuation of structure-borne sound at high frequencies but also increase the transmission loss significantly at the first resonant frequency for bending of the finite plate between the two corners.