敷设阻尼材料的圆柱壳声辐射性能实验分析

Research on the Vibration Passing and Sound Radiation of the Double Cylindrical Shell

对有限长的敷设阻尼材料的加筋双层圆柱壳进行振动和声辐射实验,测量壳体的结构响应和水中的辐射声压。对全部敷设隔声去耦材料、内壳全部敷设隔声去耦材料、外壳全部敷设以及外壳部分敷设四种工况下的近场声压进行对比,分析单频激振时内外壳体的振动特性,表明托板在内外壳的振动传递中起着较大的作用,内外壳全部敷设隔声去耦材料对抑制振动和声辐射很有效。

The experiment on vibration and sound radiation from finite stiffened double cylindrical shell covered with the uncoupled anechoic material was carried out, and the values of structure response of the shell＇s surface and sound pressure were measured. The vibration of both inner and outer shell under single-frequency excitation work condition was analyzed, and the result showed that brace makes larger function on vibration passing between inner and outer shell. Then the sound pressure of near-filed in four different work conditions was compared, which showed that the vibration and sound radiation can be rejected effectively when all the shell surfaces are coated with the uncoupled anechoic material.