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。
Abstract
The nonlinear dynamic model of a dual-rotor system with inter-shaft bearing is deduced and established, which the unbalance of dual-rotor system and the nonlinear factors of inter-shaft bearing are considered. The nonlinear dynamic characteristics of dual-rotor system subjected to internal and external excitations are studied. Firstly, the amplitude frequency responses of dual-rotor system are presented and the primary resonance characteristics of high and low pressure rotor are obtained, basing on the nonlinear dynamic model of dual-rotor system with inter-shaft bearing. Then, considering the influence of nonlinear parameters of dual-rotor system, the nonlinear dynamic responses of dual-rotor system are analyzed under internal and external excitations. Through the bifurcation diagram, axis orbit diagram, Poincare cross-sectional diagram, time-domain waveform diagram and spectrum diagram, the motion state and frequency characteristics of high and low pressure rotor under the influence of nonlinear parameters are obtained with the changes of excitation frequency. Finally, the influence of unbalance on the nonlinear response characteristics of dual-rotor system is analyzed, and the evolution law of dynamic characteristics of high and low pressure rotor under the change of unbalance is investigated. The research results can provide reference for the dynamic characteristic design of 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
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Key words
dual-rotor system /
dynamics /
internal and external excitations /
inter-shaft bearing /
nonlinear response
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参考文献
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