基于改进模态柔度曲率差的结构损伤识别方法  

Research on damage detection method based on improved modal flexibility-curvature and difference

作　　者：马立元[1] 李世龙[1] 王天辉[1] 王钢 

机构地区：[1]军械工程学院四系 [2]66440部队

出　　处：《现代制造工程》2015年第3期136-141,共6页Modern Manufacturing Engineering

摘　　要：针对柔度曲率差指标识别模糊和错误定位的问题,将灰色系统理论与柔度矩阵相结合,提出灰并联模态柔度曲率差指标,并提出损伤程度的判定方法,提高了指标对损伤的敏感性。采用变化柔度矩阵降低了噪声对损伤识别结果的影响。在一个直管结构上进行损伤识别应用,通过与柔度曲率差指标的数值模拟对比分析和实验验证,表明该指标在直管损伤识别中具有一定的有效性。Aim to improve the question of illegibility detection and inaccuracy orientation ,a new damage detection method named by gray relation Modal Flexibility Curvature Difference （ GMFCD） is proposed by combining the gray system theory with modal flexibility method.The damage determination methods have been proposed based on first-order sensitivity formula.The flexibility is changed to improve the effect of noise .The indicator is used in a straight pipe .Compared with the flexibility differential curva-ture method,the effectiveness and advantage of GMFCD are proven by means of numerical simulation and experimentation .

关 键 词：损伤识别 柔度矩阵 模态柔度曲率差 灰并联 

分 类 号：TU311[建筑科学—结构工程] TB123[理学—工程力学]