基于测量数据不确定性的结构参数识别  

Structural Parameters Identification Based on Uncertainty of Measurement Data

作　　者：杜永峰[1,2] 李万润[2] 李慧[1,2] 

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050

出　　处：《振动．测试与诊断》2012年第4期629-633,691,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(编号:50978130;51178211);甘肃省建设科技攻关资助项目(编号:JK2010-15)

摘　　要：基于模糊理论提出了考虑测量数据不确定性的结构物理参数识别方法。首先,对不确定性参数的有限个离散测量数据进行初步筛选,利用数据拟合方法建立隶属度函数;其次,通过截集法对不确定性参数进行区间分析,得到不确定性参数的区间估计;最后,利用矩阵特征值反问题方法识别结构的刚度矩阵。算例分析表明,该方法在考虑测试数据不确定性的基础上能较好地识别结构刚度,并给出结构刚度区间,使得分析结果更符合实际工程情况。Considering uncertainty of measurement data, a structural physical parameters identification method is proposed. Firstly, a number of uncertainty parameter discrete datum obtained by practical measurement are preliminary screened, the data fitting method is used to establish the membership function of uncertainty parameter; Secondly based on above analysis, though interval analysis of uncertainty parameters processed by cut set method, interval evaluation of uncertainty parameter is obtained; and then the inverse matrix Eigen value method is used to identify structural stiffness matrix; At last, the result shows that by considering uncertainty of the measurement data, this method can be used to identify the structural stiffness, and stiffness intervals are given, it is more suitable for practical projects.

关 键 词：剪切型结构 隶属度 结构物理参数 区间分析 

分 类 号：TU12[建筑科学—建筑理论] TU311.3