吸声材料的物理参数对消声瓦吸声性能的影响

用数值模拟消声瓦吸声系数的频响曲线,研究材料物理参数和空腔结构对消声瓦吸声性能的影响.应用声波在分层媒质中传播理论模型和计算含空腔材料的等效物理参量方法,数值模拟物理参数(密度、复弹性模量)值不同的几种橡胶和掺入不同种类、不同孔隙率的微粒子的复合材料作为基材的均匀的和含空腔的消声瓦吸声系数的频响曲线.模拟结果表明材料的物理参数和空腔结构对消声瓦的吸声性能不但有显著影响,而且存在使消声瓦具有高吸声性能的材料物理参数最佳值,为了要获得较好吸声效果需要对材料物理参数进行优化.通过对吸声机理的分析给出了为提高消声瓦吸声性能进行参数优化的途径,并计划将用参数反演方法优化材料的物理参数.

Effects of physical parameters of the absorption material on absorption capability of anechoic tiles

Absorption coefficients of anechoic tiles were simulated for studying an effect of physical parameters of the absorption material on absorption capability. The sound propagation model in layers and a method of calculation equivalent physical parameters of the absorbent were used to simulate absorption coefficients of anechoic tiles made by several kinds of uniform rubber with different physical parameters (density, complex modulus of elasticity) and composite material with inclusion with different kinds of hole rates. The simulation results not only show the effect of physical parameters of the absorption material on an absorption but also that there are a series of optimal values of physical parameters of the absorption material to make the anechoic tile to possess high absorption capability. That is, physical parameters of the absorption material must be optimized. By analyzing the absorption mechanism the optimum approach regarding physical parameters of the absorption material were identified.It is planned that the parameter inversion method will be used to optimize physical parameters of the absorption material.