作　　者： ; ; ;

机构地区： 中山大学工学院力学系

出　　处： 《振动与冲击》 2009年第6期29-31,共3页

摘　　要： 从弦强迫振动方程出发,建立了其相应的有限元运动方程,利用直接积分法计算了弦在外激励下的响应。将弦的局部损伤模拟为单元面积的减少,推导了响应对弦单元面积的灵敏度。并利用此响应灵敏度进行弦的局部损伤识别。数值算例表明,该方法能快速准确地识别出弦的局部损伤,并且对模拟的人工噪声不敏感。说明该方法具有一定的工程实用前景。 Finite element method was used for the forced vibration analysis of string structures. The dynamic response sensitivity with respect to the physical parameter (elemental cross-sectional area) was then derived. In the inverse analysis, the local damages in string were identified by use of dynamic response sensitivity-based finite element model updating method. It is found that the local damage(s) can be identified successfully from several dynamic response measurements. The effect of artificial measurement noise on the identified results was also discussed. Numerical simulation shows that the proposed method is insensitive to the measurement noise and is of very good accuracy. It has the potential for practical application.

关 键 词： 弦结构损伤 损伤检测 响应灵敏度

领　　域： [理学] [理学] [一般工业技术]