IDENTIFICATION OF DAMPING PARAMETERS OF LINEAR DYNAMIC SYSTEM
IDENTIFICATION OF DAMPING PARAMETERS OF LINEAR DYNAMIC SYSTEM
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DOI：
10.1142/s0219455409003132
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发表时间：
2009-09
影响因子：
3.6
通讯作者：
Sajal Roy;S. Chakraborty
中科院分区：
文献类型：
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作者：
Sajal Roy;S. Chakraborty
结构系统中的阻尼识别对于可靠地预测动力系统的响应是非常重要的。研究了由Rayleigh阻尼模型定义的线性多自由度系统的阻尼参数辨识问题。提出了一种基于结构自由振动响应的系统辨识算法来辨识结构的阻尼参数。在这种情况下，基于方程误差的SI方法很容易被用来在单元水平上识别阻尼性。利用通过有限元分析获得的数值模拟的模态数据，阐明了该公式。通过基于蒙特卡罗仿真的误差灵敏度分析，研究了该算法的稳健性。识别出的阻尼值与用于模拟模态数据的预赋值一致。
The identification of damping in a structural system is extremely important for reliable prediction of response of dynamic systems. The present study focuses on the damping parameters identification of linear multi-degree of freedom (MDOF) systems defined by Rayleigh damping model. A system identification (SI) algorithm based on the free vibration response of structures is proposed to identify the damping parameters. In doing so, the equation error based SI approach is readily developed for identification of damping properties at element level. The formulation is elucidated using numerically simulated modal data obtained through finite element analysis. The robustness of the algorithm is also studied by Monte Carlo simulation based error sensitivity analysis. The identified damping values are found to be in consistent with those of pre-assigned values used to simulate modal data.