基于等效参数反演的结构覆盖层声学性能预报

Acoustic property anticipation of structural coating based on an equivalent parameter inversion

文章基于等效参数反演的方法研究了结构覆盖层对弹性平板的声散射特性影响。根据结构覆盖层声特性的实验测量结果,基于遗传算法进行反演得到具有相同声学性能的结构覆盖层声学参数;再利用有限元耦合边界元方法分别计算了弹性平板和有限长圆柱壳敷设覆盖层前后的散射声场,获得敷设覆盖层前后的声目标强度;最后,通过消声水池试验测量单、双层平板敷设覆盖层前后的散射声场,与理论仿真结果进行对比。采用覆盖层等效参数计算得到的单、双层平板敷设覆盖层前后的散射声场中目标回波强度差值与试验测量结果的误差在3 dB以内。结果表明根据遗传算法建立的结构覆盖层等效参数反演模型可以用于预报复杂结构覆盖层的声学特性。

In this paper,the effect of structural coating on the acoustic scattering characteristics of elastic plates is studied with the equivalent parameter inversion method.According to the measurement results of the acoustic characteristics of the structural coating and by using the genetic algorithm,the equivalent parameter inversion method is used to obtain the acoustic parameters of the structural coating with the same acoustic performance,then the coupled finite element and boundary element method is used to measure the scattering sound field and obtain the sound target strength before and after laying the coating,and finally the scattering sound fields before and after laying the coating on the single-and double-layer plates are tested in the anechoic pool.The comparison between the theoretical simulation results and the test results is made.The error between the calculated target echo strength difference before and after laying the coating and the corresponding test result is within 3 dB.The result indicates that the inversion model of the equivalent parameters of the structural coating based on the genetic algorithm can be applied to predicting the acoustic performances of the coating of complex structure.