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首页> 外文期刊>Tribology International >Bifurcation analysis of flexible rotor supported by couple-stress fluid film bearings with non-linear suspension systems
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Bifurcation analysis of flexible rotor supported by couple-stress fluid film bearings with non-linear suspension systems

机译：带有非线性悬挂系统的耦合应力液膜轴承支撑的柔性转子的分叉分析

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摘要

This study analyzes the dynamic behavior of a flexible rotor supported by two couple-stress fluid film journal bearings with non-linear suspension systems. The analysis employs a short journal bearing assumption and considers the respective effects on the dynamic response of the system of the lubricant type (i.e. Newtonian or non-Newtonian), the bearing housing suspension system (i.e. linear or non-linear), the rotor speed and the degree of rotor unbalance. The behavior of the system is analyzed by reference to bifurcation diagrams, dynamic trajectory diagrams and Poincare maps, respectively. In general, the results show that the dynamics of the system are significantly dependent on the rotor speed and the degree of rotor unbalance. Furthermore, it is found that the use of a couple-stress fluid lubricant enhances the dynamic stability of the rotor-bearing system considerably compared to that obtained when using a traditional Newtonian lubricant. Finally, the results show that the common assumption of a linear journal housing suspension system results in a significant underestimation of the vibrational amplitudes of both the rotor and the bearing and should therefore be replaced by a nonlinear assumption.
机译：这项研究分析了由两个带有非线性悬架系统的耦合应力流体膜轴颈轴承支撑的柔性转子的动态行为。该分析采用了短轴颈轴承假设，并考虑了对润滑剂类型的系统（即牛顿或非牛顿），轴承箱悬挂系统（即线性或非线性），转子转速的动态响应的相应影响。和转子不平衡的程度。分别参考分叉图，动态轨迹图和庞加莱图来分析系统的行为。总的来说，结果表明，系统的动力学很大程度上取决于转子速度和转子不平衡程度。此外，已经发现，与使用传统牛顿润滑剂时相比，使用偶应力流体润滑剂可显着提高转子轴承系统的动态稳定性。最后，结果表明，线性轴颈轴承座悬挂系统的通用假设会导致转子和轴承振动幅度的明显低估，因此应由非线性假设代替。

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