部分敷设隔声去耦瓦的双层壳声学特性研究

通过物理实验研究双层圆柱壳部分敷设隔声去耦瓦时结构的声学性能,基于有限元法和边界元法,讨论部分敷设隔声去耦瓦以及敷设部位对结构声辐射性能的影响,结果表明:部分敷设对结构整体降噪效果并不明显,如果要减小结构的辐射,在条件允许的情况下应尽量选择全部敷设;不同的敷设部位"阻隔"声辐射的效果是比较明显的,但对振动的影响没有明显规律,结构的振动响应与隔声去耦瓦和结构形式的关系都比较密切,而并不是仅与隔声去耦瓦的敷设部位有关。

The acoustical characteristic of cylindrical shell covered with separate-sound and decoupled tile

The acoustical characteristic of double cylindrical shell covered with separate-sound and decoupled material partially is researched through experiment.Then based on FEM and BEM,the influence of structural covered with separate-sound and decoupled material partially and covering position on sound radiation performance is analyzed.The results show that the effect of partially covering with tiles is not obvious,and the best way of reducing structural sound radiation is to choose full covering with tiles if it is possible.In addition,the sound radiation isolation effect of tiles' covering position is obvious.But it has no obvious rules with vibration.The structural vibratory response not only has relation with the covering position of tiles,but also has intimate relationship with tiles and the structural type.