摘要
提出一种通过特征方程反问题识别子结构界面连接刚度参数的直接方法。新方法以动柔度矩阵特征方程为基础，建立通过界面位移求解界面内力的方程，由模态叠加法对可测自由度上不完全的振型拟合估计界面不可测自由度上的位移，适合于部分子结构不具备可测自由度的复杂组合结构。数值仿真算例和工程实例表明本方法具有良好的识别精度和数值稳定性。计算量和对计算机存贮量的要求也较小。
In this article,a direct method which identifies the joining stiffness on substructure interfaces is proposed by the inversion of characteristic equation.This new method based on the characteristic equation of dynamic flexibility matrix results in an equation concerning the internal force on interfaces.The equation is solved based on the study of displacement of the interfaces.The displacement of the unmeasurable degrees of freedom on the interfaces can be estimated by fitting the incomplete modal shape of the measurable degrees of freedom through modal superposition.This method is suitable for some complicated compound structures in which several substructures have no measurable degrees of freedom.Numerical simulations and practical examples indicate that this method has good indentification precision and numerical stability,which needs only little computation and computer memory.
出处
《振动工程学报》
EI
CSCD
1997年第3期335-342,共8页
Journal of Vibration Engineering
关键词
子结构法
界面
刚度
结构动力分析
Substructure
interfaces
stiffness
parameter identification
dynamic structure analysis
