基于有限元能量流模型的复杂耦合结构中低频段耦合损耗因子的计算

摘要

The indirect coupling loss factor between two flexible bodies indirectly coupled through a rigid body was calculated with the energy conversation equation, in which the energy of each subsystem was accounted through the finite element energy flow model under random wide-band excitation. The energy of each subsystem was averaged in both space and frequency. Compared with the traditional finite element method, the new procedure is efficient in computation time; and is more reliable than the traditional statistical energy analysis model. The method proposed was verified though experiment.%有限元能量流模型在随机宽带激励下,得到各子系统的空间及频域平均的能量,将其代入能量平衡方程,得到了柔性体之间的间接耦合损耗因子.与传统有限元模型计算耦合损耗因子的方法相比,该方法计算效率更高；与传统统计能量分析模型计算耦合损耗因子的方法相比,该方法计算精度更加可信.最后,该方法通过试验得到了验证.