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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。
Wave analysis is applied to study the restraint effect of additional vibration-proof mass on structure acoustic transmission in multi-turn structures composed of flat plates. By introducing the transmissivity and reflection coefficient at the corners formed by semi-infinite plates, the wave expressions of different forms of waves in the multi-turn structure under the conditions of bending wave and longitudinal wave incident are solved, which avoids solving complex partial differential equations, Thus, the analysis is simplified. Based on this, the energy transmission efficiency of the double-corner structure with two additional mass-damper qualities is deduced. In the meantime, a simplified model experiment to simulate the structure of ship is also carried out, and some laws of numerical calculation are verified. The results show that the mass of the vibration damping attached to the corner of the double corner structure not only has a good effect of restraining the structure sound transmission in the high frequency region but also significantly increases the first order of the finite length plate between the two resisting vibration masses Transmission loss at the resonant frequency.