共查询到19条相似文献,搜索用时 78 毫秒
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简要介绍挤压油膜阻尼器轴承及其基本分类,介绍各种挤压油膜阻尼器轴承的动力学特性研究和建立阻尼器流体动力模型与挤压油膜力的进展情况,总结了支承在挤压油膜阻尼器轴承上的旋转机械转子系统的动态响应特性和稳定性的研究结果及对这类强非线性的转子-阻尼器支承系统的非线性响应特性研究的进展情况,并对该类减振结构的未来发展进行了展望。 相似文献
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利用拉格朗日(Lagrange)方程建立了非稳态油膜力的转子-定子-轴承系统碰摩故障的力学模型,应用数值分析对其进行研究,得出转子系统在激励频率作为唯一控制参数时系统的轴心轨迹图和分岔图;对该系统响应的非线性行为和故障机理进行分析,从而为该类转子系统故障诊断和系统的安全运行提供理论依据.研究结果表明,当激励频率作为唯一控制参数时,系统存在周期运动、拟周期运动和混沌运动等丰富的非线性现象. 相似文献
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为了深入地研究转子-轴承系统的分岔规律,揭示转子系统丰富的非线性动力学行为,采用短轴承非稳态非线性油膜力的一般数学模型获得圆柱轴承的非线性油膜力表达式。在一定参数条件下,采用非线性动力学理论和方法,对刚性Jeffcott转子系统的动力学特性进行了分析。通过计算得到了系统的分叉图、时间历程、轴心轨迹、相图及Poincare映射图。计算结果表明-在特定的参数域内系统存在丰富的非线性动力学行为。该方法收敛速度快、精度高,为定性控制转子-轴承系统的稳定运行状态提供了理论依据。 相似文献
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非线性挤压油膜阻尼器转子系统的非协调运动分析 总被引:1,自引:0,他引:1
为了对挤压油膜阻尼器转子系统的非协调运动进行分析,提出了非线性油膜力数据库方法,有效地解决了非线性油膜力的快速计算问题。该方法将阻尼器轴颈沿径向和周向的速度变化范围(-∞,+∞)转化到(-1,+1),给定阻尼器的长径比,建立了阻尼器轴颈在各离散运动状态下的油膜力数据库,直接示得对应运动状态下的非互性油膜力,从而对转子系统的非协调运动进行分析。数值计算表明,非线性油膜力数据库方法对转子系统的非协调运动分析非常有效。数值计算得到了转子 特定参数范围内的分叉图,系统存在亚谐波、概周期和混沌等非协调运动。该方法对实际转子系统的稳定性分析及优化设计具有一定的应用价值。 相似文献
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在非线性油膜力作用下 ,建立了转子 -联轴器系统的运动微分方程。非线性油膜力则采用有限差分法求解 ,对联轴器耦合的刚性转子系统和柔性转子系统分别进行了计算和分析。结果表明对于平衡转子系统在平衡点失稳后 ,在一个较大的转速范围内存在着稳定的涡动轨迹 ,联轴器两侧转子的质量相差越大 ,则发生 Hopf分岔所对应的转速越高。对于不平衡转子系统 ,在同步涡动轨道失稳后 ,系统将产生准周期和倍周期等一系列的分岔现象 ,并且质量偏心的位置对系统的动力学行为有影响。 相似文献
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Chen Hong Wen Bang-chun Li He Zhang Xiao-wei 《Frontiers of Mechanical Engineering in China》2006,1(2):204-208
A dynamic model of a dual-disk vertical over-hung rotor-bearing system is developed, taking into account nonlinear oil-film
force. Its dynamic behaviors are investigated by numerical Runge-Kutta method. Its bifurcation and chaos characteristics are
analyzed with crack fault and without crack fault. By analyzing the bifurcation plot, Poincare section plots and amplitude
spectra, we found that the crack greatly influences the dynamic characteristics of the rotor-bearing system. Because of the
strong effect of the nonlinear oil-film force and crack to the system, 1/2 times, 1/3 times frequency components appear in
the response spectrum map. The results may bring up theoretical references for fault diagnosis of rotor-bearing systems.
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Translated from Journal of Vibration Engineering, 2005, 18(1) (in Chinese) 相似文献
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In the classical process for stability studies on the rotor-bearing system with crack faults, the simple discrete model is adopted for research on such problems, which neglect some needful dynamical influence factor, such as the material damping, shearing effect and gyroscopic effects, etc. Therefore, it is necessary to find a precise calculation model for simulation of the rotor-bearing system with cracks faults. In this paper, instead of the traditional simple discrete model, finite element (FE) model is adopted to investigate the motion stability of a nonlinear rotor system with crack fault. According to finite element theory, the FE model of the cracked rotor system is established firstly. It should be pointed out that the element where the crack occurs is modeled by a particular crack element and the supports at both ends are simulated by two nonlinear loads. Then, based on dimensionless and dimensionality reduction, the Newmark-[3 method and the shooting method are employed to study the effect of eccentricity and the depth of crack on instability speed and bifurcation feature. Furthermore, the simulation results are verified by some corresponding experiments. The simulation and experimental results show that instability speed does not change monotonically, but decreases firstly and then increases when the amount of eccentricity increases. Moreover, as the type of instability changes, the instability speed jumps concomitantly. Additionally, the presence of crack fault can disturb the oil whirl, as a result, instability speed tends to increase slightly, but it does not affect the type of instability and jumping phenomenon. This research presents an effective and convenient method which uses the finite element method (FEM) to research the motion stability of the nonlinear rotor-bearing system with cracked faults and other nonlinear force, and the proposed method can provide a theoretical reference for stability analysis and vibration control in more complex relevant rotor-bearing system. 相似文献
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Rotating machinery is becoming faster and lightweight due to the advanced technologies made in engineering and materials sciences. It is required them to run for longer periods of time. All of these factors mean that the detection, location and analysis of faults play a vital role in highly reliable operations. Using vibration analysis, the condition of a machine can be periodically monitored. In this study, dynamic behavior of a direct coupled rotor-bearing system is investigated. Experimental vibration analyses in the vertical direction of the system are implemented. Vibration monitoring with trend analysis and spectrum graphs are employed to diagnose the excessive vibration source(s). It is seen that the rotating machineries can have one or more vibration sources. The vibration values obtained from each bearing show that the main excessive vibration sources in the system stem from mechanical looseness and misalignment. 相似文献
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Zhang Zhinan Zhou Mingdong Ding Weimin Ma Huifang 《Frontiers of Mechanical Engineering》2019,14(4):461-473
Frontiers of Mechanical Engineering - The purpose of this work is to develop a new analysis model for angular-contact, ball-bearing systems on the basis of plate theory instead of commonly known... 相似文献
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针对数控系统的力位置控制实现难度大、参数调整复杂的问题,研究了一种基于Quanser Q8卡和Si mulink的半实物仿真系统。以X-Y-Z三轴运动平台为对象,对该系统中软硬件的具体构成进行了设计。通过以Z轴的恒接触力控制为目标,在Si mulink软件中设计了含有位置环和力环的控制器,给出了实际仿真曲线。结果表明,该系统控制器设计合理,参数调整简单,控制效果观察直观。 相似文献
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本文改进了R iccati传递矩阵法并将其扩展应用于分析强非线性转子——轴承系统的动力响应。提出了一种新型的传递向量{fT┇.e.T,1}={fT┇..e*T}T和新的变换{f}=[S*].{.e*},简化了Riccati传递矩阵法,并提高了R iccati传递矩阵法的数值稳定性。文中就一强非线性转子-轴承系统,分别用本文的方法和Runge-Kutta法做了计算。通过理论分析和两算法结果的比较,验证了本文方法的有效性和数值稳定性等多种优点。本法特别适合于分析强非线性大型复杂转子-轴承系统的瞬态响应。 相似文献