摘要
利用在结构系统可测自由度上获得的不完备模态参数和子结构的有限元模型 ,根据模态缩减理论 ,建立了识别子结构间连接子结构参数的优化模型 ,采用逐次二次规划法求解 ,改善了测试噪声和模态截断误差的影响。该方法识别精度高、收敛速度快、计算量小 。
Based on the modal reduction method, incorporating the substructure finite element model with the incomplete modal parameters measured from the assembled structure, an efficient method for the joint physical parameters identification is presented in this paper. In the process, the modal reduction method is employed to reduce the freedoms of assembled structures in order to decrease the amount of computation, the optimization model for sequence quadratic programming is established by treating the two norms of the frequency difference between the condensed model and the measured frequency as the objective function, the sensitivity matrix of eigenvalues as the gradient vectors, and parts of eigenvectors as constraints. The numerical example shows that the presented procedure can successfully identify the joint parameters from modal parameters with noise for condensed model.
出处
《应用力学学报》
CAS
CSCD
北大核心
2004年第1期113-116,共4页
Chinese Journal of Applied Mechanics
关键词
模态缩减
逐次二次规划
连接子结构
物理参数
参数识别
截断误差
joint, physical parameter, identification, modal reduction method, sequence quadratic programming.
