【摘要】 【目的】针对复杂激励与联轴器平行不对中耦合作用下，转子混输泵主轴系易出现振动幅值超标、诱发碰摩故障的问题，揭示多工况参数对轴系振动特性的影响机制，明确碰摩故障临界阈值，为现场安全运行提供参考。【方法】首先，采用Fluent软件完成多工况下主转子流体激励载荷计算，获取载荷变化规律，为建模提供载荷边界；其次，建立含平行不对中故障的主轴系集中质量动力学模型，推导系统动力学控制方程；然后，采用4阶Runge-Kutta法求解方程，获取不同工况下轴系振动响应；最后，分析关键参数对轴系振动特性与碰摩故障的影响规律。【结果】结果表明，不对中故障会导致主转子轴心轨迹发散，位移振幅随不对中量增大而升高，不对中量达0.106 mm时主转子进入碰摩区；转速与位移振幅无明显相关性，x、y方向分别存在4个、7个碰摩转速区间；泵出口压力每增大0.2 MPa，主转子激励与位移振幅均以60%左右比例增大，出口压力达0.8 MPa时主转子发生碰摩故障。更多还原

【Abstract】 [Objective] Aiming at the problem that the main shaft system of the rotor multiphase pump is prone to excessive vibration amplitude and rub-impact fault under the coupling effect of complex excitation and parallel misalignment of the coupling, the influence mechanism of multi-working condition parameters on the vibration characteristics of the shaft system was revealed, and the critical threshold of rub-impact fault was clarified to provide reference for field safe operation. [Methods] Firstly, the Fluent software was used to complete the calculation of fluid excitation load of the main rotor under multiple working conditions, and the variation law of the load was obtained to provide the load boundary for modeling. Secondly, a lumped mass dynamic model of the main shaft system with parallel misalignment fault was established, and the dynamic control equation of the system was derived. Then, the 4-order Runge-Kutta method was adopted to solve the equation, and the vibration response of the shaft system under different working conditions was obtained. Finally, the influence law of key parameters on the vibration characteristics and rub-impact fault of the shaft system was analyzed. [Results] The results show that the misalignment fault will lead to the divergence of the axis trajectory of the main rotor, and the displacement amplitude increases with the increase of the misalignment. The main rotor enters the rub-impact zone when the misalignment reaches 0.106 mm. There is no obvious correlation between rotational speed and displacement amplitude, and there are 4 and 7 rub-impact speed intervals in x and y directions respectively. For every 0.2 MPa increase in pump outlet pressure, the excitation and displacement amplitude of the main rotor increase by about 60%, and the rub-impact fault occurs when the outlet pressure reaches 0.8 MPa.更多还原