未知激励下框架结构系统辨识的特征系统实现算法

李炜明;朱宏平;吴贤国;夏勇;

振动与冲击 ›› 2010, Vol. 29 ›› Issue (8) : 228-231.

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PDF(1180 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (8) : 228-231.
论文

未知激励下框架结构系统辨识的特征系统实现算法

  • 李炜明 1,2;朱宏平1,2;吴贤国1,2;夏勇1,2

作者信息 +

System Identification based on Experimental Responses of a Frame Structurewith Unknown Inputs

  • LI Wei-ming ¹,²; ZHU Hong-ping¹,²; WU Xian-guo¹,²; XIA Yong¹,²
Author information +
文章历史 +

摘要

在激励未知的情况下,基于试验加速度数据,对某三层框架进行了结构系统参数的辨识。引入了特征系统实现算法,在实验室条件下,基于模拟环境激励的框架结构的自由振动加速度响应,生成了Hankel矩阵,计算了相应的互相关函数;运用奇异值分解求得了系统的特征值,通过计算指标MAC、EMAC、MPC、CMI,剔除了系统的虚假模态,得到了结构的相应频率与阻尼,与实测数据以及有限元计算结果的比较分析表明,未知激励下,特征实现算法能较准确地对结构的动力参数进行辨识。

Abstract

System identification of a frame was performed based on experimental acceleration responses with unknown inputs. The ambient vibration was simulated in the lab, and the block Hankel matrix and the cross-correlation were calculated according to the eigensystem realization algorithm. The singular values were obtained by singular value decomposition. The frequencies and damping ratios were identified according to the values of indices MAC, EMAC, MPC, CMI, and the pseudo parameters were eliminated. The results were verified by the experiment and the FEM calculation, and their difference was inspected. The investigation indicates that the dynamic parameters are able to be identified by ues of eigensystem realization algorithm with unknown inputs.

关键词

框架结构 / 系统辨识 / 特征系统实现算法 / 加速度响应

Key words

frame structure / system identification / eigensystem realization algorithm / acceleration responses

引用本文

导出引用
李炜明;朱宏平;吴贤国;夏勇;. 未知激励下框架结构系统辨识的特征系统实现算法[J]. 振动与冲击, 2010, 29(8): 228-231
LI Wei-ming ⊃⊃ZHU Hong-ping⊃⊃WU Xian-guo⊃⊃XIA Yong⊃⊃. System Identification based on Experimental Responses of a Frame Structurewith Unknown Inputs[J]. Journal of Vibration and Shock, 2010, 29(8): 228-231

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