【摘要】 研究了由振动试验数据同时修正无阻尼结构系统有限元模型的质量和刚度矩阵。期望的矩阵性质包括满足特征方程、对称性、半正定性和稀疏性作为约束条件形成矩阵束最佳逼近问题。利用部分Lagrangian乘子法,将非线性约束优化问题转化为一个等价的矩阵线性变分不等式,提出了求解该矩阵线性变分不等式的一个邻近点型方法,并分析其全局收敛性。最后用数值结果说明了本文方法的性能和应用。更多还原

【Abstract】 The problem of correcting simultaneously mass and stiffness matrices of finite element model of undamped structural systems using vibration tests is considered in this paper. The desired matrix properties, including satisfaction of the characteristic equation,symmetry,positive semidefiniteness and sparsity,are imposed as side constraints to form the optimal matrix pencil approximation problem. Using partial Lagrangian multipliers,we transform the nonlinearly constrained optimization problem into an equivalent matrix linear variational inequality,develop a proximal point-like method for solving the matrix linear variational inequality,and analyze its global convergence. Numerical results are included to illustrate the performance and application of the proposed method.更多还原