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研究弹流润滑(EHL)转子-滚动轴承系统在碰摩-不对中耦合故障状态下的动力学响应.基于EHL理论与Hertz弹性接触理论,并考虑转静碰摩故障与转子不对中故障,建立耦合故障作用下转子-滚动轴承系统非线性动力学微分方程,通过龙格库塔数值解法进行求解得到故障状态下系统振动响应,对比分析其结果并在航空发动机转子实验台进行验证.研究结果表明:①考虑EHL理论对单一碰摩故障系统的影响较大.考虑EHL理论的系统进入拟周期运动与周期2运动状态时的转速较未考虑EHL理论系统明显提高,周期2解所处的转速区间较未考虑EHL理论系统大.②考虑EHL理论对碰摩-不对中耦合故障系统的影响较大.考虑EHL理论的系统由周期1解进入拟周期运动,且进入拟周期状态时的转速较未考虑EHL理论的系统明显提高.③通过计算结果与实验结果进行对比分析,可发现考虑EHL理论的耦合故障系统的转子在1/2倍频与2倍频处的振动响应均弱于未考虑EHL理论的系统,考虑EHL理论的模型比未考虑EHL理论的模型能更准确体现耦合故障系统的振动响应.
The dynamic response of EHL rotor-roller bearing system under the condition of rub-impact-misalignment coupling failure is studied.Based on EHL theory and Hertz elastic contact theory, and taking into account the failure of rub-impact and rotator misalignment, the coupling is established The nonlinear dynamic differential equations of the rotor-roller bearing system under fault action are solved by the numerical solution of Runge-Kutta to obtain the system vibration response under fault condition. The results are compared and validated on aeroengine rotor test bench. The results show that: ① Considering the influence of EHL theory on a single rub-impact fault system, considering the system of EHL, the speed of the system entering the quasi-periodic motion and the periodic 2 motion state is obviously higher than that without considering the EHL theory system, Considering the theory of EHL system is large. (2) Considering the influence of EHL theory on the system of coupled friction-misalignment coupling, the system considering EHL theory goes into quasi-periodic motion from period 1 and the rotation speed of quasi-periodic state is less than that of EHL The theoretical system is obviously improved.③According to the comparative analysis of calculation results and experimental results, it can be found that the coupling failure considering EHL theory The vibration response of the system rotor at 1/2 frequency and 2 倍 frequency is weaker than that without EHL theory. The model considering EHL theory can reflect the vibration response of coupled system more accurately than the model without EHL theory.