等高线法的桥式起重机主梁损伤识别

Damage identification of bridge crane girder based on contour method

起重机金属结构在长期使用下形成的疲劳损伤对起重机的安全生产造成严重影响。基于ANSYS有限元分析软件,建立了桥式起重机金属结构有限元模型,并对结构主梁进行了不同损伤情况下的模态分析,根据起重机主梁在不同损伤工况下的同阶及不同阶模态频率的不同,使用前三阶模态频率结合等高线相交理论方法,直观、定量地得到起重机主梁裂纹存在的位置和裂纹的损伤程度,并通过数值仿真案例验证了该方法的有效性。

The fatigue damage of crane metal structure caused by long-term use has a serious impact on the safety of crane production.Based on the ANSYS finite element analysis software,this paper establishes the finite element model of the metal structure of the bridge crane,and carries out the modal analysis of the structural girder under different damage conditions.According to the different modal frequencies of the same order and different order of the crane girder under different damage conditions,the first three modal frequencies combined with the contour intersection theory are used to intuitively and quantitatively obtain the crane.The location of the main beam crack and the damage degree of the crack,and the effectiveness of the method is verified by numerical simulation.