Effect of journal out-of-roundness on stability of a symmetric hydrodynamic journal bearing system. Part 2: Experimental investigation
Effect of journal out-of-roundness on stability of a symmetric hydrodynamic journal bearing system. Part 2: Experimental investigation
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DOI：
10.1177/1350650115579677
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
Wubin Xu;P. Ogrodnik;Bing Li;Hongxian Zhang;Shanghan Gao
中科院分区：
文献类型：
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作者：
Wubin Xu;P. Ogrodnik;Bing Li;Hongxian Zhang;Shanghan Gao
本研究的第二部分是进一步的研究，旨在从实验调查中提供证据。本文通过实验研究了轴颈圆度对对称型流体动压轴颈系统动态性能的影响。制作了4根不同轴颈圆度大小的轴进行实验。测试平台配备了数据记录系统，用于收集和处理位移探头和热电偶提供的所有信号。通过对轴颈振动谱的分析，确定了油膜失稳的起始速度。实验表明，轴颈过圆引起的双同步频率振动分量显著，使系统表现为油的旋转，但机理不同。结果也与本研究第1部分的理论计算相吻合，该计算验证了当无量纲外圆度低于0.4时，轴颈外圆度可能会增加系统的整体稳定性，但振动水平会增加。该研究可以帮助工程师选择合理的公差或使具有一定制造公差的系统在更稳定的范围内运行。
Part 2 of the study furthers the research and aims to present evidences from an experimental investigation. The work presents the experimental research with a rig for examining the effect of journal out-of-roundness on the dynamic performance of a symmetric hydrodynamic journal bearing system. Four shafts with different magnitudes of journal out-of-roundness were fabricated for the experiment. The test rig was equipped with a date logging system to collect and process all signals provided by the displacement probes and the thermocouples. The onset speed of oil film instability was determined by analysing the spectrums of the journal vibrations. The experiments show a notable double-synchronous frequency vibration component incurred by the journal out-of-roundness, which makes the system behave as oil whirling but the mechanism is different. The results also coincide with the theoretical calculations presented in Part 1 of the study, which validates that the journal out-of-roundness may increase the overall system stability when the dimensionless out-of-roundness is below 0.4, but vibration levels increase. The study can help engineers to choose reasonable tolerances or enable systems with certain manufacturing tolerances to operate within a more stable range.