双转子系统内转子不同心频谱特性分析  

Spectrum Analysis of a Dual Rotor Bearing System under Bearing Elevation in Inner Rotor

作　　者：张宏献 黄良沛[1] 李学军 蒋玲莉 张帆宇 ZHANG Hongxian;HUANG Liangpei;LI Xuejun;JIANG Lingli;ZHANG Fanyu(Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,Hunan University of Science and Technology,Xiangtan 411201,Hu′nan,China;Lushan College of Guangxi University of Science and Technology,Liuzhou 454006,Guangxi,China;School of Mechanical&Electrical Engineering,Foshan University,Foshan 528225,Guangdong,China)

机构地区：[1]湖南科技大学机械设备健康维护湖南省重点实验室,湖南湘潭411201 [2]广西科技大学鹿山学院,广西柳州545006 [3]佛山科学技术学院机电工程与自动化学院,广东佛山528225

出　　处：《机械科学与技术》2021年第5期701-709,共9页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(11672106,11702091);湖南省自然科学基金项目(2018JJ3140)。

摘　　要：采用Timoshenko梁建立双转子系统的有限元模型,再根据三弯矩方程计算内转子不同心引起的附加轴承载荷,将轴承载荷引入双转子动力学方程,最终建立内转子不同心的双转子系统动力学模型。采用Newmark-β法求解系统动力学方程,分析不同心对转子系统振动频谱的影响。搭建了双转子试验台对仿真结果进行验证。研究表明:内转子轴承的不同心将导致轴承载荷随标高量线性变化,轴承载荷会使内转子产生静态变形。不同心状态下的不平衡响应除引起内、外转子倍频振动外,还激起了多阶正向进动和反向进动的固有频率,导致双转子系统振动频谱更加复杂。The effects of bearing elevation in inner rotor on the spectrum of the dual-rotor-bearing system were studied by finite element method and the three-moment Equation.Firstly,the finite element dynamic model of the dual-rotor system was established with Timoshenko beam.Secondly,the additional bending moment and bearing load due to the bearing elevation were calculated according to the three-moment Equation.Then,the finite element dynamic model of the dual-rotor system considering the elevation of inner rotor was established,and the dynamic equation of the dual-rotor system was obtained.Finally,the Newmark-βmethod was used to solve the dynamic equation and the effects of the bearing elevation on the dynamic characteristics of the rotor system was analyzed.In order to verify the simulation results,a dual-rotor test bench was built,and the experimental results were compared with the simulation results.The results show that the additional load of the bearing will be caused by the elevation misalignment,and the additional load will change linearly with the elevation.The additional bearing load causes static deformation of the inner rotor.The unbalanced response under the elevation misalignment condition not only causes the inner and outer rotor to vibrate at one time frequency,but also arouses the natural frequencies in both the forward precession and the backward precession.As a result,the vibration spectrum of the dual rotor bearing system becomes more complex.

关 键 词：航空发动机 双转子系统 不同心 不对中 频谱分析 NEWMARK-Β法 

分 类 号：TV231.96[水利工程] O347.6[理学—固体力学]