支承刚度对整机耦合振动影响的定量分析  

Quantitative Analysis for Effects of Supports Stiffness on Whole Aero-Engine Coupling Vibration

作　　者：屈美娇 陈果[1] 冯国全 Qu Mei-jiao;CHEN Guo;FENG Guo-quan(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;AECC Shenyang Engine Institute,Shenyang 110015,China)

机构地区：[1]南京航空航天大学民航学院,江苏南京210016 [2]中国航发沈阳发动机研究所,辽宁沈阳110015

出　　处：《推进技术》2018年第7期1605-1616,共12页Journal of Propulsion Technology

基　　金：国家基础研究项目(613139);江苏省科技创新基金(KYLX16_0387);南京航空航天大学博士学位论文创新与创优基金(BCXJ17-10)

摘　　要：为研究支承刚度对航空发动机整机耦合振动的影响,以带机匣的航空发动机转子试验器为对象,建立了试验器的整机有限元模型。对试验器进行了整机模态试验,并利用试验结果对有限元模型进行了修正。在此基础上,分别改变前后支承刚度仿真分析了试验器前3阶模态。通过定义转静耦合因子和截面转静碰摩危险系数,定量研究了支承刚度对试验器固有频率、整机模态振型、转子静子耦合程度、压气机和涡轮截面转静碰摩危险程度的影响。结果表明,支承刚度对刚体模态振型影响较大,所定义的转静截面碰摩危险系数能够定量反映截面转静碰摩危险程度,并且支承刚度对转静耦合程度和截面转静碰摩危险程度的影响呈非线性。In order to study the effects of the supports stiffness on the whole aero-engine coupling vibration quantitatively,an aero-engine rotor rig with casing is selected to be the research object,and a finite element model of engine was built. The modal experiments of the rig were carried out,and the finite element model was updated and verified based on the modal experimental results. The first 3 order natural frequencies and modal shapes of the rig were calculated with different support stiffness values. By defining a rotor-stator coupling factor and a section rotor-stator rubbing risk coefficient,the effects of the supports stiffness on the natural frequencies,the whole modal shapes,the rotor-stator coupling degree and the rotor-stator rubbing risk of compressor section and turbo section were studied quantitatively. Results show that the support stiffness has a great influence on the rigid body modal shapes. The section rotor-stator rubbing risk can be quantitatively reflected by the section rotorstator rubbing risk coefficient which defined in this paper. Moreover,the effects of the supports stiffness values on the rotor-stator coupling degree and the rotor-stator rubbing risk are nonlinear.

关 键 词：航空发动机 整机耦合振动 支承刚度 转静耦合 转静碰摩 有限元 

分 类 号：V231.92[航空宇航科学与技术—航空宇航推进理论与工程]