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为了解决统计能量法的参数灵敏度问题,通过建立两子结构耦合结构模型,利用差分法对统计能量法中三个基本参数进行分析,研究了了基本参数的变化对结构系统的输入功率在子结构能量分配和对子结构能量误差的影响。结果表明:统计能量分析法的三个参数对结构响应预示精度与输入功率在子结构之间的能量分配有重要影响,参数的变化改变子结构之间的能量分配,子结构模态密度误差增大降低其它子结构的能量估算,增大子结构内损耗因子误差将降低所有子结构的能量和总系统能量。耦合损耗因子的误差改变子结构之间的能量分配,但不改变系统的总的能量。在弱耦合条件下,得到的结论同样适用多子结构耦合系统。
In order to solve the problem of parameter sensitivity of statistical energy method, three basic parameters of statistical energy method were analyzed by using differential method to establish coupling model of two substructures. The effects of the change of basic parameters on the input power of structure system in substructure Energy Distribution and Impact on Energy Error of Substructure. The results show that the three parameters of statistical energy analysis have an important influence on the prediction accuracy of structure response and the energy distribution of input power among substructures. The change of parameters changes the energy distribution between substructures, and the increase of substructure modal density error Large reduction of energy estimates for other substructures. Increasing the loss factor error in substructures will reduce the energy of all substructures and the total system energy. The error of the coupling loss factor changes the energy distribution between substructures but does not change the overall energy of the system. Under the condition of weak coupling, the conclusion obtained also applies to the multi-substructure coupling system.