复杂转子—轴承—汽封耦合系统的非线性振动分析

发布时间：2018-03-10 17:44

  本文选题：非线性振动　切入点：转子动力学　出处：《振动与冲击》2016年09期 　论文类型：期刊论文

【摘要】：基于非线性动力学和转子动力学理论,综合考虑Muszynska非线性汽封力、非线性油膜力和转子不平衡量的耦合作用,建立了双叶轮-轴承交错布置的复杂转子-轴承-汽封系统动力学模型。采用有限元法(FEM)推导系统运动微分方程,编程计算了系统转速、圆盘偏心量、汽封长度和汽封间隙等参数对系统动力特性的影响,并利用分岔图、频谱图、相轨迹和Poincare映射图表征了系统的运动性态。研究表明:耦合系统具有高度非线性,随着参数的变化系统呈现出周期运动、倍周期运动、准周期运动和混沌运动等复杂动力学行为。通过减小圆盘偏心,增加系统汽封长度,选取合适的汽封间隙有利于提高转子-轴承-汽封系统的稳定性,改善系统的运动特性。
[Abstract]:Based on the theory of nonlinear dynamics and rotor dynamics, the coupling of Muszynska nonlinear vapor sealing force, nonlinear oil film force and rotor unbalance is considered synthetically. The dynamic model of complex rotor-bearing-steam seal system with double impeller and bearing staggered arrangement is established. The differential equation of motion of the system is derived by using the finite element method (FEM), and the system rotational speed and disk eccentricity are calculated by programming. The dynamic behavior of the system is characterized by bifurcation diagram, spectrum diagram, phase trajectory and Poincare map. The results show that the coupled system is highly nonlinear. With the change of parameters, the system presents complex dynamic behaviors such as periodic motion, periodic motion, quasi-periodic motion and chaotic motion. By reducing the eccentric of the disk, the length of the steam seal of the system is increased. Selecting proper steam seal clearance can improve the stability of rotor-bearing-steam seal system and improve the system motion characteristics.
【作者单位】： 浙江大学热工与动力系统研究所;浙江大学机械设计研究所;
【基金】：国家自然科学基金资助项目(51305392) 浙江省重大科技专项(2013C01150)
【分类号】：TH113.1
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本文编号：1594389