摘要
以某型号航空发动机整机振动试验台为研究对象,建立了简化的整机动力学模型,考虑中介轴承的非线性弹性恢复力,运用Newmark-β与Newton-Raphoson法结合进行数值求解,通过对比整机系统中高低压转子处与机匣测点处的非线性振动响应,分析了中介轴承间隙对整机系统非线性振动响应的影响规律。结果表明,随着中介轴承间隙的增大,可能导致整机系统出现振动突跳、双稳态、高低压转子耦合程度降低以及组合共振等现象,其中机匣能够反映内部转子的振动特性,但机匣不同位置测点的情况不同,总体上中后测点在转子出现非线性振动特性时也能观测到相应的非线性振动特性,特别是在出现组合共振时能够表现出更为丰富的组合频率信息。研究结果有助于认识中介轴承非线性对航空发动机整机系统尤其是机匣的非线性振动特性影响规律,对航空发动机机匣上测点位置的选择能提供一定的指导。
A simplified dynamics model of the whole aeroengine is established,based on a realistic aeroengine vibration testing rig.Hertzian contact theory is applied to model inter-shaft bearing.Used the Newmark-β/Newton-Raphoson method to solve the equation,the nonlinear response of dual rotor and casing of aeroengine are analyzed respectively.The effect of bearing clearance on nonlinear characteristic of the whole aeroengine is studied particularly.The result shows that phenomena like vibration jump,bistable state and the reduction of coupling degree between low-and high-pressure rotor are appeared with bearing clearance increasing.The casing can reflect the vibration characteristics of the rotor,but the situations of the measuring points at different positions of the casing are different.In general,the nonlinear vibration characteristics can be observed at the middle and rear measuring points when the corresponding phenomena of the rotor occurred.The research results are helpful to understand the influence of the nonlinearity of the inter-shaft bearing on the nonlinear vibration characteristics of the aeroengine system,especially the casing,and can provide certain guidance for the selection of the position of the measuring point on the casing of the aeroengine.
作者
林荣洲
侯磊
孙传宗
杨洋
侯升亮
陈予恕
LIN Rong-zhou;HOU Lei;SUN Chuan-zong;YANG Yang;HOU Sheng-liang;CHEN Yu-shu(School of Astronautics,Harbin Institute of Technology,Harbin 150001,China;Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China;School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2022年第3期557-568,共12页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(11972129,11702228)
国家科技重大专项(2017-IV-0008-0045)
应用力学与结构安全四川省重点实验室开放课题基金资助项目(SZDKF-201903)
辽宁省博士启动基金资助项目(2019BS182)
辽宁省基础研究项目(LJGD2019009)。
关键词
非线性振动
航空发动机
组合共振
中介轴承
振动传递
nonlinear vibration
aeroengine
combination resonance
inter-shaft bearing
vibration transmission
作者简介
林荣洲(1995—),男,博士研究生。电话:18204619660,E-mail:20b918008@stu.hit.edu.cn;通讯作者:侯磊(1987—),男,博士,教授。电话:18003667477,E-mail:houlei@hit.edu.cn。
