【摘要】 往复式压缩机曲轴系扭振会引起烧瓦及轴系断裂等重大问题，为掌握压缩机转子系统扭振响应，提出了一种考虑衬套-销轴碰撞间隙、曲轴-轴承油膜间隙的压缩机柔性转子系统扭振动力学求解方法，为避开曲轴系固有频率提供了一种新的思路及方法。基于多体动力学理论以及Hertz接触理论，求解了含碰撞间隙下曲轴系扭振动力学响应，分析表明，曲轴系第4列曲柄销的扭振幅值最大，扭转角位移幅值为0.051°，动态角速度峰值为156.026 rad/s。基于此，考虑了曲轴-轴承油膜间隙，利用有限差分法及超松弛迭代法计算滑动轴承油膜压力，并通过压力扰动法求解轴承动态特性系数，综合考虑衬套-销轴碰撞间隙和曲轴-轴承油膜间隙对曲轴系动态响应的影响，开展了考虑预应力下的曲轴系模态分析，并对比分析了考虑油膜间隙和不考虑油膜间隙下曲轴系的共振情况。结果表明，考虑油膜间隙后曲轴系第3、8阶固有频率分别降低了44.64%、21.23%，且在同一转速范围带内，考虑综合间隙下曲轴系共振转速点减少，2阶临界转速降低了38.55%，共振的概率增大。更多还原

【Abstract】 The torsional vibration of reciprocating compressor crankshaft system can cause major problems such as burnt bearings and shaft fracture. In order to understand the torsional vibration response of the compressor rotor system, a torsional vibration mechanics solution method for the flexible rotor system of the compressor considering the bushing-pin collision clearance and the oil film clearance of the crankshaft-bearing was proposed, which provided a new idea and method to avoid the natural frequency of the crankshaft system. Based on the multi-body dynamics and Hertz contact theory,the torsional dynamic response of the crankshaft system with collision clearance was solved. The results show that the torsional vibration amplitude of the 4th column crank pin is the largest, the torsional angular displacement amplitude is 0. 051°, and the dynamic angular velocity peak value is 156. 026 rad/s. Based on this, the crankshaft-bearing oil film clearance was considered, the oil film pressure of sliding bearings was calculated by the finite difference method and the over-relaxation iterative method, and the dynamic characteristic coefficients of bearings were solved according to pressure perturbation method. The effects of the bushing-pin collision clearance and the crankshaft-bearing oil film clearance on the dynamic response of the crankshaft system were comprehensively considered in the modal analysis of the crankshaft system under preload. The resonance of the crankshaft with and without oil film clearances was compared. The results show that the natural frequencies of the 3rd and 8th orders of the crankshaft system decreases by 44. 64% and 21. 23%, and when considering the reduction of the resonant speed point of the crankshaft with comprehensive clearance in the same speed range, the 2nd order critical speed is reduced by 38. 55%, and the probability of resonance increases.更多还原