基于波叠加法的圆柱壳声辐射计算

Sound radiation numeration of cylinder based on the wave superposition method

筒状物是日常生活当中非常常见的一种物体形状,采用波叠加法对其进行了声辐射计算,选用了3种虚源来计算,分别是单一简单虚源、双简单虚源以及相似缩比虚源。另外,还对双简单虚源位置以及相似缩比虚源缩比因子对计算结果的影响进行了讨论。结果表明:单一简单虚源很难保证较高的计算精度,而采用双虚源同时虚源位置放置恰当则能获得很好的计算精度,采用与计算模型相似的缩比模型作为虚源,同样也能获得较好的计算精度。由于双虚源情况对虚源位置有一定的要求,而相似缩比模型作为虚源则不会遇到位置的问题,因此对于此类结构可以采用相似缩比模型作为虚源来计算声辐射。

Cylinder with two ended cap is a common shape,the wave superposition method routine is implemented in a Matlab code to calculate its sound radiation.And three kind of dummy sources which are single dummy source,double dummy sources and scaled dummy source respectively are used to caculate.In addition,effects on the results of the location of the double dummy sources and the ratio of the scaled dummy source are discussed.And the results show that the precision is lowest with a single dummy source,the precision is highest with double dummy sources when they properly located,and the precision is higher with scaled dummy source.Because in the double dummy sources case the locations are very important and they should be considered additionally,but it will not meet the above question in the scaled dummy source case.Therefore the scaled dummy source is the best choice.