基于灰并联模态柔度曲率差的梁结构损伤识别

Damage Identification of a Beam-type Based on Grey Relation Modal Flexibility Curvature Difference(GMFCD)

运用提出的灰并联模态柔度曲率差方法对子结构进行了损伤识别。结果表明:该方法仅需低阶模态参数即可进行损伤识别,不论对单一位置损伤,还是多种损伤共存,均具有损伤定位的能力,并能定性反映损伤程度。与已有的柔度差、柔度差值曲率两种柔度指标的数值模拟进行比较,显示了该指标检测损伤的有效性和优越性。

The damages of a substructure were identificated by the proposed identification method.Numerical simulation examples indicate that the damage location and severity in structures,with single damage or multiple ones,can be detected efficiently by GMFCD through only a few of the lower order modal parameters.Compared to the aforementioned flexibility indicators,such as the change in flexibility,flexibility differential curvature method,the effectiveness and advantages of GMFCD are shown.