Research on modeling joining and joining modification method of hybrid FE-SEA model

Since the connection method at the boundary of the hybrid FE-SEA (finite element-statistical energy analysis, FE-SEA) model affects the overall calculation accuracy of the model, the missing or inaccurate connection relation will lead to a large error in the model calculation. In order to effectively solve the calculation error caused by the connection problem of hybrid FE-SEA model, this paper starts from the modeling methods and connection relations of hybrid-point connection, hybrid-line connection and hybrid-surface connection. In order to solve the modeling method and correction problems of the hybrid-point connection in the hybrid FE-SEA model, the out-of-plane wave motion equation at the hybrid-point connection was established by using the superposition principle of plane waveforms in polar coordinate system. The hybrid-point connection and wave-number relation in Cartesian coordinate system are studied. The radiation radius correction method of hybrid-point connection is proposed. An example is given to verify the effectiveness of the method. In order to solve the modeling and correction problem of hybrid-line in hybrid model, a hybrid-line connected triangular waveform function model was established by using the method of linear difference. The direct field dynamic stiffness matrix of hybrid-line connection in node coordinate system is studied. According to the shape function of the hybrid-line connection wavenumber space, a method to correct the shape function of the hybrid-line connection is proposed, and the validity of the method is verified.

Automated summary

This paper addresses the connection problem in the hybrid FE-SEA model, focusing on the modeling methods and connection relations. It proposes methods to solve the modeling and correction problems of hybrid-point connection and hybrid-line connection, and verifies their effectiveness.