超材料型周期管路声传播特性及低频宽带控制

发布时间：2018-12-13 09:25

【摘要】：船舶管路系统噪声的低频宽带控制是船舶设计和制造中亟待解决的关键问题之一。将超材料理论引入船舶管路系统的结构设计,构造了具有低频声波带隙的一维周期管路结构,并给出了周期管路声波带隙和声波透射系数的计算方法。计算结果表明,该周期管路同时存在声波布拉格带隙和局域共振带隙。在这两种带隙频率范围内,声波在系统中的传播将被衰减抑制。进一步发现,布拉格和局域共振带隙在一定条件会发生耦合,出现带隙耦合展宽现象,且两种带隙存在精确耦合条件。利用带隙耦合的展宽效应和低频设计,可实现声波在低频范围内的传播操控,从而达到船舶管路系统低频噪声宽带控制的目的。
[Abstract]:The low frequency wideband control of ship pipe system noise is one of the key problems to be solved in ship design and manufacture. The supermaterial theory is introduced into the structural design of ship pipe system, and a one-dimensional periodic pipe structure with low frequency acoustic band gap is constructed, and the calculation method of acoustic band gap and acoustic wave transmission coefficient is given. The results show that there are both acoustic Bragg band gap and local resonance band gap in the periodic pipeline. In these two bandgap frequencies, the propagation of sound waves in the system will be attenuated and suppressed. It is further found that the Bragg and local resonance band gaps will be coupled under certain conditions, and the bandgap coupling broadening will occur, and the two kinds of band gaps have precise coupling conditions. By using the broadening effect of bandgap coupling and the low frequency design, the sound wave propagation and manipulation in the low frequency range can be realized, thus the broadband control of the low frequency noise in the ship pipeline system can be achieved.
【作者单位】：海军工程大学动力工程学院;海军工程大学舰船动力工程军队重点实验室;武汉理工大学能源与动力学院;
【基金】：国家自然科学基金项目(51205404,51306205)资助
【分类号】：U664.84;O422

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