太阳电池阵板间铰链副刚度参数辨识

THE STIFFNESS PARAMETER IDENTIFICATION OF HINGE ON SOLAR ARRAY

以真实铰链副连接的有机玻璃帆板模型试验模态参数为基础 ,采用特征方程反问题的直接方法辩识铰链副的刚度参数。首先通过模态叠加法由可测自由度上的不完全试验振型拟合估计包括界面位移和转角在内的不可测自由度上的振型。然后以单板子结构的动柔度矩阵特征方程为基础。通过界面振型求解界面内力 ,并由铰链副连接元刚度矩阵建立平衡方程求解铰链副的刚度参数。

In the article,on the basis of experimental modal analysis of polymethyl methacrylate model in which parts are jointed by real hinges,the stiffness parameters on the interfaces of hinges are indentified by using direct method for inverse problem characteristic equation.First,the modal shape of the unmeasurable degrees of freedom of displacement and rotation on the interface can be estimated by fitting the incomplete experimental modal shape of the measurable degrees of freedom through modal superposition.Then the internal forces on interfaces can be gotten based on the characteristic equation of dynamic flexibility matrix of single board.The stiffness parameters can be calculated from the solution of an equilibrium equation,established through the stiffness matrix of hinge joint element.The pracatical example indicates that this method has good identification precision and can be effectively used in practical engineering.