There are three main approaches to predict the noise level : similitude structure method including the frequency - response method and proportion method , modal method including finite element method ( fem ) and boundary element method ( bem ) , and statistical energy analysis ( sea ) . the advantage of similitude structure method is to give the predicting data fast , but it has some error because of dealing with rough similitude parameter and mass load 目前对噪声预示主要有三个方法:一是相似结构外推法,包括频率响应法和比例法等;二是传统的模态方法,包括有限单元方法( finiteelementmethod , fem ) 、边界单元方法( boundaryelementmethod , bem )等;三是统计能量分析方法( statisticalenergyanalysis , sea ) 。