基于曲率模态及其衍生参数损伤识别的数值模拟  

Numerical simulation based on curvature mode and its derivative parameter damage recognition

作　　者：陈维学 雷建平[1] 李之达[1] CHEN Weixue;LEI Jianping;LI Zhida(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,湖北武汉430063

出　　处：《湘潭大学学报（自然科学版）》2022年第6期106-112,共7页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金(51708433)。

摘　　要：该文通过梁自由振动有限元方程和曲率模态理论,表明曲率模态及其衍生参数对损伤识别灵敏度较高,具有较好的识别效果.借助有限元分析软件ABAQUS,对简支梁进行数值模拟和频率模态分析,通过差分方法对损伤前后各工况下的模态位移进行推导得到各阶曲率模态.同时,计算并绘制出各工况下的曲率模态及其衍生参数曲率模态差的变化曲线,可应用于对梁结构损伤位置和程度的识别.Through the finite element equation of free vibration of beam and curvature mode theory,it is shown that the curvature mode and its derived parameters are highly sensitive to damage identification and have a good identification effect.With the aid of finite element analysis software ABAQUS,the numerical simulation and frequency modal analysis of simply supported beams were carried out.The modal displacements under various working conditions before and after damage were deduced by difference method to obtain the curvature modes of each order.And,the curvature mode and the curvature mode difference of its derivative parameter under various working conditions were calculated and drawn,which can be used to identify the damage location and extent of beam structures.

关 键 词：有限元 曲率模态 曲率模态差 损伤识别 

分 类 号：TU3[建筑科学—结构工程]