针对燃气轮机动力涡轮转子系统中滚动轴承故障高发的问题，基于赫兹接触理论建立了滚动轴承故障激励力模型，并验证了其准确性。基于有限元法建立了转子-轴承-机匣-固定平台整机模型以揭示振动传递特性。频域分析结果表明：单故障条件下不平衡激励力与滚动轴承故障激励力是单向耦合的关系；双故障条件下，若故障点直径相同，加速度信号中滚子故障主要频率对应的加速度幅值最大，外圈故障主要频率对应的加速度幅值最小。

For the high incidence of rolling bearing faults in the power turbine rotor system of gas turbine,a rolling bearing fault excitation force model is established based on Hertzian contact theory and its accuracy is verified.A rotorbearingstator model is established based on the finite element method to reveal the vibration transmissibility characteristics.The results of the frequencydomain analysis show that the relationship between unbalanced excitation force and rolling bearing fault excitation force is unidirectional coupling under the single fault condition.Under the double fault condition,if the diameters of the two fault points are the same,the vibration amplitude corresponding to the main frequency of roller fault in the acceleration signal is the largest,and the vibration amplitude corresponding to the main frequency of outer ring fault is the smallest.

TK474.8+12

国家科技重大专项（2017-Ⅰ-0001-0001)