高维双转子系统的碰摩响应特性研究  

Research for response characteristics of rub-impact high-dimensional dual-rotor system

作　　者：罗贵火[1] 杨喜关[1,2] 王飞[1] 

机构地区：[1]江苏省航空动力系统重点实验室,南京航空航天大学能源与动力学院 [2]中国人民解放军94655部队

出　　处：《振动工程学报》2015年第1期100-107,共8页Journal of Vibration Engineering

摘　　要：借助有限元软件和自由界面模态综合法,建立了含碰摩故障的高维双转子系统非线性动力学模型。随后利用单位脉冲响应和Duhamel积分的方法进行了数值求解,在考虑挤压油膜非线性力和中介轴承非线性力的基础上,研究了含碰摩故障的反向旋转双转子系统的动力响应特性。研究结果表明:该方法的求解效率主要取决于非线性力处的自由度个数,求解效率高;碰摩故障会使系统的轴心轨迹有明显削峰或使其变得杂乱;碰摩故障使系统响应中,除两同步不平衡激励频率外,还可能出现两者的组合频率和组合频率的分频;碰摩故障会改变系统同步不平衡响应频率的幅值,且对内转子同步响应频率幅值影响更大。A high-dimensional nonlinear dynamic model of a dual-rotor system with rub-impact was established using the FEM software and free interface modal synthesis method.Numerical Solution was obtained with impulsive receptance method and Duhamel integral method.The nonlinear dynamic response characteristics were studied for the rub-impact counter-rotating dual-rotor system with the nonlinear forces of Squeezed Film Damper and inter-shaft bearing taken into consideration.The results show that the method has high computing efficiency which mainly depends on the degrees of freedom at the location where the nonlinear force acts.The peak of the orbit is obviously cut,or the orbit is disordered for rub-impact.For the system responses,there may be combinations of two frequencies and frequency divisions of the combinations in addition to the rotation frequencies of the internal and external rotors.The rub-impact can change the amplitude of the synchronous frequency unbalance response,and it had greater influence for amplitude of the internal rotor synchronous frequency.

关 键 词：双转子 碰摩 自由界面模态综合法 单位脉冲响应 Duhamel积分 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]