含阻振质量的L型结构在舱段壳体隔振中的应用

利用波动理论分析L型连接板转角处阻振质量阻抑振动波传递的特性，基于阻抗失配和波形转换原理，将此阻抑技术引入壳体隔振设计中，数值计算壳体隔振设计前后的振动与声辐射性能，讨论阻振质量的重量和截面尺寸对其隔振性能的影响，并在此基础上根据模态控制法进一步对壳体隔振设计进行探讨。研究结果表明：将转角含阻振质量的L型连接结构引入壳体隔振设计，不仅能有效降低动力舱段结构的振动，而且还能显著隔离振动波向邻近舱段的传递；在总的阻振质量不变的前提下，合理地布置变质量变截面的阻振质量能显著提高总的隔振降噪效果。

Application of L-Shaped Plates with Blocking Mass to the Vibration Isolation of Cabin Shells

In this paper, the vibration attenuating function of L-shaped plates with blocking mass is analyzed based on the wave theory, and such attenuation techniques are introduced in the vibration isolating design of cabin shells by incorporating the principle of impedance mismatching and wave conversion. Particularly, the vibration characteristics and sound radiation properties of the shell （with and without the blocking mass） are calculated numerically. Furthermore, the influence of the mass＇s weight as well as its sectional dimension on the vibration isolating performance is discussed, and an optimization design is proposed accordingly. The results show that the presented L-shaped plate not only reduces the vibration of engine cabins, but also significantly suppresses the vibration transmission to the adjacent cabins. Meanwhile, it is observed that as long as the total weight of the isolation mass remains constant, arranging the blocking mass properly with variable weight and cross-sections could enhance the performance of vibration isolation and noise reduction.