作　　者： ; ;

机构地区： 绍兴文理学院土木工程系

出　　处： 《振动与冲击》 2008年第4期7-9,共3页

摘　　要： 分析并改进了最小秩修正方法。对最小秩方法存在的缺点进行了深入分析,指出了造成这一缺点的根本原因,以此为基础提出了一种改进的最小秩修正方法,首先对被修正矩阵的秩作出预先判定来确定计算中应该采用的模态数目,然后再利用最小秩方法来计算损伤参数,数值算例的结果验证了分析的合理性和所提方法的可靠性。 The minimum-rank update method for structural damage detection is studied here.The disadvantage of the minimum-rank update technique is investigated firstly and then an improved minimum-rank update theory is presented for structural damage identification.Based on a condition that the number of the measured modes is larger than the rank of the perturbed matrix,the rank of this matrix is calculated and then used to determine the exact number of mode shapes adopted in the minimum-rank update scheme.Finally,structural damage level can be easily obtained.A planar truss structure is taken as an illustration example to validate the correctness and reliability of the proposed method.

关 键 词： 损伤检测 最小秩修正 特征值分解

领　　域： [机械工程] [理学] [理学]