离心式压缩机转子系统稳定性控制方法研究

针对离心压缩机转子失稳已成高效长周期运转主要障碍问题，通过分析失稳机理及影响因素，研究压缩机转子系统稳定性控制方法。结合工程案例，采用有限元方法对转子进行瞬态动力学分析，研究转速及因密封等部件交叉刚度对转子稳定性影响。研究转子振动位移反馈与速度反馈方法对转子失稳振动的控制效果。结果表明，两种方法均能有效提高转子系统稳定性。对比在达到相同控制效果时执行机构能量消耗表明，通过位移反馈方式能以更低能耗达到控制效果。该结果可为离心压缩机转子稳定性控制与提高提供新的思路及可行性。

Investigation on the instability control strategy for rotor-bearing system in centrifugal compressor

Centrifugal compressor is key equipment for process industry such as petroleum refinery and chemical. As the capacity and compress ratio as well as the efficiency increase, instability of rotor-bearing system become the major obstacle for it operation in a long period without shutdown. Based on the mechanism and affect factors research, the paper investigate the control strategy for improving the stability of rotor bearing system. After introducing a case study about a centrifugal compressor with several instable faults, transient response investigation is conducted to find the effect of rotating speed and cross coupling stiffness of seal on the stability of rotor. Then force can be exerted on rotor by controller through displacement feed-back or velocity feed-back strategy. By displacement feed-back, the controller functions as spring with cross-coupling stiffness opposite to seal. While, it function as a damper when velocity feed-back strategy is adopted. Results of the research indicate that both of the strategy can depress the vibration caused by instable of the rotor. Furthermore, displacement feed-back strategy has high efficiency because of it consume lower power. Results of this paper can provide new insight and feasibility for control or upgrade the stability of compressor rotor-bearing system.