转轴上产生横向裂纹后,局部刚度削弱,柔度增加.旋转时,裂纹截面所受合力与开口方向之间的夹角不断变化,引起裂纹的开闭效应,裂纹附近局部柔度也随之发生变化.本文采用边界元法计算不同裂纹开口方向的柔度,并得到转轴弯曲刚度增量△k 随裂纹开口方向变化的曲线及其前五次简谐分量的系数.它是裂纹转子轴承系统动力特性理论研究的基础。 After the transverse crack is generated on the rotating shaft, the local rigidity is weakened and the flexibility is increased.When rotating, the angle between the resultant force of the cracked section and the opening direction changes constantly, causing the crack opening and closing effect, and local flexibility near the crack also occurs The boundary element method is used to calculate the flexibility of the crack opening direction and the curve of the increment of the bending rigidity of the rotating shaft △ k with the direction of the crack opening and the coefficient of the first five harmonic components are obtained. It is the dynamic force of the cracked rotor bearing system Characteristics of the theoretical basis of the study.