内外激励下双转子系统非线性动力学特性研究  

A study on the nonlinear dynamic characteristics of a dual-rotor system subjected to internal and external excitations

作　　者：向玲[1] 胡雅楠 陈凯乐 邴汉昆 胡爱军 XIANG Ling;HU Yanan;CHEN Kaile;BING Hankun;HU Aijun(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China;Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,Baoding 071003,China)

机构地区：[1]华北电力大学机械工程学院,河北保定071003 [2]华电电力科学研究院有限公司,杭州310030 [3]河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003

出　　处：《振动与冲击》2023年第12期69-76,108,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52075170,52175092)。

摘　　要：针对含中介轴承的双转子系统,在考虑转子不平衡和中介轴承非线性因素的基础上,推导并建立了双转子系统的非线性动力学模型,研究了内外激励下双转子系统的非线性动力学特性。首先,针对建立的双转子-中介轴承系统非线性动力学模型,研究了双转子系统的幅频响应,获得了高低压转子的主共振特性;其次,考虑双转子系统非线性参数的影响,分析了内外激励下双转子系统的非线性动力学响应,通过分岔图、轴心轨迹图、庞加莱截面图、时域波形图和频谱图等,获得了不平衡影响下高低压转子在激励频率变化下的运动状态和频率特征;最后,分析了不平衡量对双转子系统非线性响应特性的影响,研究了不平衡量变化下高低压转子动力学特性的演变规律。研究结果可为双转子系统动力学特性设计和高低压转子故障诊断提供参考。A nonlinear dynamic model of a dual-rotor system with inter-shaft bearing was deduced and established,for which the unbalance of the dual-rotor system and the nonlinear factors of inter-shaft bearings were considered.The nonlinear dynamic characteristics of the dual-rotor system subjected to internal and external excitations were studied.Firstly,the amplitude frequency responses of the dual-rotor system were presented and the primary resonance characteristics of high and low pressure rotor were obtained,basing on the nonlinear dynamic model of the dual-rotor system with inter-shaft bearing.Then,considering the influence of nonlinear parameters of the dual-rotor system,the nonlinear dynamic responses of the dual-rotor system were analyzed under internal and external excitations.Through the bifurcation diagram,the axis orbit diagram,the Poincare cross-sectional diagram,the time-domain waveform diagram and the spectrum diagram,the motion state and frequency characteristics of high and low pressure rotor under the influence of nonlinear parameters were obtained with the changes of excitation frequency.Finally,the influence of unbalance on the nonlinear response characteristics of the dual-rotor system was analyzed,and the evolution law of dynamic characteristics of high and low pressure rotor under the change of unbalance was investigated.The results can provide reference for the dynamic characteristic design of a dual-rotor system and the fault diagnosis of high and low pressure rotor.

关 键 词：双转子系统 动力学 内外激励 中介轴承 非线性响应 

分 类 号：TH113[机械工程—机械设计及理论]