Effect of journal out-of-roundness on stability of a symmetric hydrodynamic journal bearing system. Part 1: Theoretical analysis
Effect of journal out-of-roundness on stability of a symmetric hydrodynamic journal bearing system. Part 1: Theoretical analysis
复制标题
轴颈不圆度对对称流体动压轴颈轴承系统稳定性的影响。
DOI：
10.1177/1350650115579211
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发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Gao, SH
中科院分区：
文献类型：
--
作者：
Xu, WB;Ogrodnik, PJ;Li, B;Gao, SH
研究了轴颈不圆度对油膜轴承支承的旋转机械动态性能的影响。提出了一种考虑轴颈不圆度的对称动压径向轴承系统的通用模型。结果表明，轴颈不圆度影响油膜厚度，进而影响系统的动态特性。轴颈不圆度可能在系统运行时引起额外的振动分量。该振动分量的振幅取决于轴颈不圆度的大小，而其频率是同步振动频率的整数倍，取决于轴颈不圆度的轮廓。虽然轴颈不圆度可能会增加整个系统的稳定性，当无量纲不圆度低于0.2时，影响很小;在0.2和0.4之间，稳定性得到改善，但振动水平很高。当无量纲轴颈不圆度大于0.5时，理论分析表明系统稳定性存在较大的不确定性，油膜失稳边界不明确，需要从理论和实验两方面进一步验证。系统设计者在设计阶段应在稳定性和振动水平之间进行平衡。
The study examines the effect of journal out-of-roundness on the dynamic performance of rotating machines supported by oil film bearings. A general model of a symmetric hydrodynamic journal bearing system allowing for journal out-of-roundness is presented. The results show that the journal out-of-roundness influences the oil film thickness and further influences the dynamic characteristics of the system. The journal out-of-roundness may incur an additional vibration component when the system operates. The amplitude of this vibration component is dependent upon the magnitude of the journal out-of-roundness, while the frequency of which is an integral multiple of the synchronous vibration frequency, depending upon the profile of journal out-of-roundness. Although journal out-of-roundness may increase overall system stability, when dimensionless out-of-roundness is below 0.2, there is little effect; between 0.2 and 0.4, stability is improved but vibration levels are high. When the dimensionless journal out-of-roundness is larger than 0.5, the theoretical analysis shows much uncertainty on the system stability and the boundary of oil film instability is not very clear, this needs further examination from both theoretical and experimental evidences. The system designer should balance between the stability and the vibration level at the design stage.
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影响因子：
--
作者：
Nuaa Nanjing
通讯作者：
Nuaa Nanjing
DOI：
--
发表时间：
1989
期刊：
--
影响因子：
--
作者：
M. Goodwin
通讯作者：
M. Goodwin
影响因子：
2.5
作者：
D. Vijayaraghavan;D. Brewe;T. Keith
通讯作者：
D. Vijayaraghavan;D. Brewe;T. Keith
DOI：
10.1177/1350650111414627
发表时间：
2011-09
期刊：
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
影响因子：
--
作者：
P. Ogrodnik;W. Xu;M. Goodwin;G. Bancroft
通讯作者：
P. Ogrodnik;W. Xu;M. Goodwin;G. Bancroft
DOI：
10.1177/1350650111408180
发表时间：
2011-08
期刊：
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
影响因子：
--
作者：
P. Ogrodnik;W. Xu;M. Goodwin;G. Bancroft
通讯作者：
P. Ogrodnik;W. Xu;M. Goodwin;G. Bancroft