【摘要】 在实际工程中,由有限元模型得到的计算值与通过试验获得的测量值之间往往存在偏差,为了能够精确预测结构的动力响应,依据测量信息修正存在的动力模型是非常必要的。考虑用不完备复模态实验测量数据修正粘性阻尼矩阵的问题。在假定分析质量矩阵与刚度矩阵是精确的情况下,通过求解一个约束最优化问题,得到了满足特征方程的加权Frobenius范数意义下的最优对称修正矩阵。更多还原

【Abstract】 There is a deriation between predictions resulting from finite element model(FEM)and experimental results of a testing model or an actual structure.Updating an existing dynamic model based on its modal data measured is very important in order to predict precisely actual behaviors of a structure via its structural dynamic model.Here,the mass and stiffness matrices analyzed are assumed correct and only the viscous damping matrix needs to be updated.By solving a constrained optimization problem,the optimal corrected damping matrix satisfying the required eigenvalue equation is found under a sense of the weighted Frobenius norm.更多还原