基于SMA的隔声瓦宽频声学优化研究

Broadband acoustic optimization of sound isolation tile based on SMA

文章采用分层媒质模型,对双壳背衬下隔声瓦的隔声性能进行了数值计算,借助敷设隔声瓦的加筋水下双壳振动及声辐射模型试验探索其宏观降噪特性。在腔型对隔声瓦声学性能的影响规律分析基础上,针对现有隔声瓦低频声学性能的不足,提出了一种采用形状记忆合金丝作为驱动器的宽频可控隔声瓦。结果表明:宽频可控隔声瓦低频机械激振下声学性能显著提高,同时有效拓宽了工作频带。

Based on the model of composite layered medium, the sound isolation performance of sound isolation tile under double shells backing condition is analyzed by numerical methods. The noise reduction is explored through the reinforced double cylindrical shell＇s underwater vibration and sound radiation experiment. Concerned with the deficiency of low frequency acoustic performance, a broadband controllable sound isolation tile which takes shape memory alloy as driver is summed up based on the analysis of the influence of cavity size to the acoustic performance. The results show that the controllable sound isolation tile significantly improves acoustic performance under low frequency mechanical excitations, and effectively broadens the operating frequency band.