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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Dynamic analysis of an unbalanced rotor-water pump-bearing system considering varying compliance effect and localized defects on bearing races
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Dynamic analysis of an unbalanced rotor-water pump-bearing system considering varying compliance effect and localized defects on bearing races

机译：考虑顺应效应和轴承座圈局部缺陷的不平衡转子-水泵-轴承系统的动力学分析

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摘要

A multi-degree of freedom (DOF) dynamic model is developed using the transfer matrix method to obtain the vibration response of an unbalanced rotor-coaxial water pump bearing system due to varying compliance and localized race defects of the bearing. In this model, the bending flexibility and masses of the rotor and bearing housing are taken into consideration. The two rolling element rows of the water pump bearing are modeled as a series of springs and dampers, and the anisotropic bearing stiffness and damping changing with the rotational speed are analyzed. The varying compliance and the localized race defect are both modeled as periodic excitations, on which the influences of the unbalanced forces in the rotor are considered. By using the vibration model, the discrete frequency spectra of vibration responses caused by the varying compliance and localized race defects of the two rolling element rows are predicted. The results show that for the varying compliance or a race defect of an individual rolling element rows, there are a series of additional components in the frequency spectrum in addition to the peaks at the harmonics of characteristic frequency due to the effect of the rotor unbalance. The response amplitude due to varying compliance of the roller row is found to be quite high in comparison to that due to varying compliance of the ball row because the axial load carried by the ball row uniforms the contact load distribution among balls and then reduces the varying compliance excitation.
机译：使用传递矩阵方法建立了一个多自由度（DOF）动力学模型，以获取不平衡转子-同轴水泵轴承系统的振动响应，这是由于轴承的顺应性和局部座圈缺陷引起的。在该模型中，考虑了转子和轴承座的弯曲柔韧性和质量。将水泵轴承的两个滚动元件行建模为一系列的弹簧和阻尼器，并分析了各向异性轴承的刚度和阻尼随转速的变化。变化的顺应性和局部种族缺陷都被建模为周期性励磁，并考虑了转子中不平衡力的影响。通过使用振动模型，预测了由两个滚动体行的变化顺应性和局部滚道缺陷引起的振动响应的离散频谱。结果表明，对于单个滚动元件行的变化的顺从性或竞争缺陷，由于转子不平衡的影响，除了特征频率的谐波峰值外，频谱中还有一系列其他成分。与由于变化的滚子行的柔韧性相比，由于滚子行的变化柔韧性引起的响应幅度非常高，这是因为由滚子行承载的轴向载荷使滚珠之间的接触载荷分布均匀，然后减小了变化顺应性激励。

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