考虑内燃机轴系激振力矩刚度非线性和随机性的影响,通过轴系扭纵耦合非线性动力学模型和虚拟激励法来计算轴系随机响应,依据首次超越破坏原则探讨随机载荷下内燃机轴系动力的可靠性。通过仿真计算得出平稳随机激励比非平稳的动力可靠性高,纵向振动和随机激励的传递路径对动力可靠性有一定的影响等结果。 Considering the nonlinearity and randomness of the exciting moment rigidity of the internal combustion engine shaft system, the nonlinear responses of the shaft system are calculated by nonlinear coupling dynamics model and virtual excitation method. According to the principle of first overtaking failure, Power reliability. The simulation results show that the steady random excitation is more stable than the non-stationary ones, and the transmission path of longitudinal vibration and random excitation has certain influence on the dynamic reliability.