离心式压缩机转子系统稳定性控制方法研究  

Instability control strategy for rotor-bearing system in centrifugal compressor

作　　者：王维民[1] 齐鹏逸[1] 李启行[1] 高金吉[1] 

机构地区：[1]北京化工大学诊断与自愈工程研究中心,北京100029

出　　处：《振动与冲击》2014年第6期102-106,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目资助(51135001);国家重点基础研究发展计划项目资助(2012CB026000)

摘　　要：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。For a centrifugal compressor,as its capacity,compression ratio and efficiency,instability of its inner rotor-bearing system becomes the major obstacle for its operation in a long period without shutdown.Based on the study on its mechanism and influencial factors,the control strategy for improving the stability of the rotor bearing system was discussed.By introducing a case study about a centrifugal compressor with several instable faults,the transient response was investigated to find the effect of rotating speed and cross coupling stiffness of seal on the stability of rotor.Then the force exerted on the rotor was controlled by using a controller through two ways,namely,the displacement feed-back and velocity feed-back strategy.With displacement feed-back,the controller functions as a spring with cross-coupling stiffness against the seal.While,it functions as a damper when velocity feed-back was adopted.The results indicate that both strategies can depress the vibration caused by the instability of the rotor.Furthermore,the displacement feed-back strategy has high efficiency because of its lower power consuming.The results can provide some new insight and feasibility for controlling or upgrading the stability of compressor rotor-bearing system.

关 键 词：离心压缩机 转子 稳定性 控制 

分 类 号：TH133.2[机械工程—机械制造及自动化]