【摘要】 由振动系统动力方程的有限元表达形式,推导出结构损伤和模态参数间的联系,建立基于有限元的结构多位置裂缝的识别方法.本方法通过损伤灵敏度矩阵,识别结构裂缝所在的单元位置并确定裂缝的深度,计算简便.作者通过数值计算,验证了此方法的有效性.从算例结果可以看出,将结构单元适当细分,可以提高裂缝识别的精度.更多还原

【Abstract】 The connection between structural damage and modal parameter was derived and the identification of multi-position cracks in structures based on finite element method was obtained by using finite element expression of vibrating system’s dynamic equation.By making use of damage sensitivity matrix,it is eligible to identify exact positions of structural cracks,and the crack depths in the meanwhile.This method is simple in calculation.This method is verified by means of numerical calculations.The results show that comparatively detailed division of the structural elements may improve the identification accuracy.更多还原