转子/机匣碰摩引起的转子弯扭耦合振动  

Coupled Bending and Torsional Vibration Due to Rotor-Casing Contact

作　　者：廖明夫[1] 宋明波[1] 张霞妹 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《振动．测试与诊断》2016年第5期1009-1017,共9页Journal of Vibration,Measurement & Diagnosis

摘　　要：以航空发动机为研究背景,针对其转子/机匣间隙小,转速控制存在延迟,碰摩故障发生可能导致的发动机转子弯扭耦合振动的特征,建立了计及陀螺力矩的弹性支承-柔性转子-弹性静子系统的碰摩故障模型,模型中考虑了有延迟的转速控制力矩。采用延迟微分方程的数值积分方法对方程进行了数值分析。分析结果表明:碰摩作用发生时,剧烈的碰摩会导致转子的反进动,而碰摩与转速控制力矩的延迟共同作用会导致转子的扭转振动加剧,甚至可能发生扭振失稳。应当在发动机控制系统的设计中充分考虑这种转子动力学影响。同时,发动机扭振信号也可以作为转子/机匣发生碰摩的重要诊断信息之一。In an aero-engine, which has small rotor-casing clearance and delay in speed control, coupled bending and torsional vibration may occur due to rotor-casing contact. A rotor-casing contact model of a flexible rotor with elastic bearing and elastic stator was established, and the gyroscopic moment of the rotor and the delayed rotational speed control torque was considered. Then, the rotor's coupled bending and torsional vibration were studied using a numerical method. The results showed that when the rotor-casing contact event occurred, the backward whirl was caused by violent rotor-stator contact. Under the effect of the rotor-casing contact and the delayed rotational speed control torque, the torsional vibration occurred and caused the instability of the torsional vibration. The larger the rub torque, the more easily the instability of the torsional vibration occurred. This rotor dynamic effect should be considered in the control system design of an aero-engine, and the torsional vibration signal of the rotor can be used as important diagnostic information of the rotor-casing contact. © 2016, Editorial Department of JVMD. All right reserved.

关 键 词：航空发动机 转子 转静碰摩 弯扭耦合振动 失稳 

分 类 号：TH113.1[机械工程—机械设计及理论]