Abstract: The paper investigates the load identification of a threeplate coupling system based on the statistical energy analysis theory. Firstly, the stable power injection method is employed to identify the inner loss factors and the coupling loss factors of substructures, in which the indirect coupling characteristics are considered. Based on the established power flow balance equation of the system, the identification of concentrated load is conducted. The results show that, in the highfrequency range, the identified input power agrees well with the measured input power. The work presented in the paper provides a theoretical reference for load identification of structures in the high frequency domain.

Key words: vibration and wave, statistical energy analysis, load identification, indirect coupling, input power

摘要： 基于统计能量分析方法，研究一个三板耦合系统的载荷识别问题。首先采用稳态功率流输入方法，并考虑子结构间的间接耦合特性，确定各子结构的内损耗因子和耦合损耗因子，完成耦合系统的理论与试验建模。根据所获得的系统功率流平衡方程对集中载荷进行识别研究。实验结果表明，在考虑的频率范围内，载荷输入功率的识别值与测量值具有非常好的一致性。本文的工作为结构中高频载荷的识别提供一些理论参考。

关键词: 振动与波, 统计能量分析, 载荷识别, 间接耦合, 输入功率