基于改进模态柔度曲率差的结构损伤识别方法

摘要

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 .%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。