关键词: 混合线连接, 形函数, 动态刚度矩阵

Abstract:

Aiming at the problem of mid-frequency dynamics environment prediction for spacecrafts, a hybrid line junction modeling method is proposed. The dynamic stiffness matrix of line junction is deduced in the wave number coordinate by use of the wave theory, then by using Fourier transform technique, the hybrid line junction model is established on the basis of displacement shape function. Three types of shape function construction method including modal interpolation shape function, triangle wave shape function and Shannon wavelet shape function are presented in this paper, and both advantages and disadvantages of these shape functions are compared. The simulation results of typical structure show that the modeling method presented in this paper has a good prediction accuracy, and can be applied to the mid-frequency prediction of spacecraft structures.

Key words: Hybrid line junction, Shape function, Dynamic stiffness matrix