国外文献 > 1.轴承 > 8. 系统与应用 > 系统集成
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| 标 题： |
A COMPARATIVE STUDY OF A MULTIRECESS HYBRID WORN JOURNAL BEARING SYSTEM OPERATING IN TURBULENT REGIME COMPENSATED WITH DIFFERENT FLOW CONTROL DEVICES
一种多级混合式轴承系统在湍流工况下运行的比较研究，采用不同流量控制装置进行补偿 |
| 作 者： |
Satish C. Sharma
E. Rajasekhar Nicodemus |
| 关键词： |
Wear [穿戴]
Turbulence [ 湍流]
Flow control devices [ 流量控制装置] |
| 出版年： |
2011 |
| 会议名： |
2010 ASME/STLE International Joint Tribology Conference (IJTC 2010)
2010年ASME/STLE国际摩擦学联合会议（IJTC 2010） |
| 届 次： |
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| 摘 要： |
The objective of the present work is to study analytically the performance of a four-pocket hybrid worn journal bearing system operating in turbulent regime compensated with different flow control devices i.e. orifice, capillary and constant flow valve (CFV) restrictors. The wear caused on the bearing surface is modeled using Dufrane's abrasive wear model. The Reynolds equation based on Constantinescu turbulent lubrication theory has been solved using FEM and Newton Raphson method along with the appropriate boundary conditions. The numerically simulated results have been presented for a wide range of restrictor design parameter, non-dimensional external load, wear depth parameter and Reynolds number. The numerically simulated results suggest that when the bearing operates in turbulent regime under unworn condition, the performance of the bearing from the viewpoint of minimum fluid film thickness, fluid film stiffness and damping coefficients and the lubricant flow requirement gets improved vis a vis the bearing operating in laminar regime under unworn condition for all the compensated bearings studied. However, this improvement in bearing performance comes at the cost of higher value of frictional torque. Further, it has been observed that when the bearing operates in turbulent regime, the influence of wear on bearing performance is appreciably less as compared to bearing operating in laminar regime for all the compensated bearings studied. Another notable observation made from the study is that among the various compensated bearings studied in the present work, the constant flow valve compensated bearing appears to be more suitable from the viewpoint of minimum fluid film thickness, fluid film stiffness and damping coefficients and stability threshold speed margin, when the bearing operates in turbulent regime under worn/unworn conditions. The present study suggests that, a proper selection of type of flow control device and the value of its restrictor design parameter is essential in order to obtain an improved performance of a bearing operating in turbulent regime under worn/unworn conditions.
本研究旨在通过分析方法，探讨在不同流控装置（即孔口、毛细管和恒定流量阀CFV限流器）补偿下运行的四腔混合式滚动轴承系统在湍流工况下的性能。轴承表面磨损采用杜弗兰磨料磨损模型进行建模。基于Constantinescu湍流润滑理论的雷诺方程，结合有限元法（FEM）与牛顿-拉夫逊法，并采用适当的边界条件求解。数值模拟结果针对多种限流器设计参数、无量纲外载荷、磨损深度参数以及雷诺数进行了展示。数值模拟结果表明，在未磨损状态下，当轴承处于湍流工况时，所有所研究的补偿型轴承在最小流体膜厚度、流体膜刚度、阻尼系数以及润滑油流动需求方面，其性能均优于在层流工况下的未磨损状态。然而，这种轴承性能的改善是以摩擦扭矩值增加为代价的。此外，研究发现，对于所有已研究的补偿型轴承而言，当轴承在湍流工况下运行时，与层流工况相比，磨损对轴承性能的影响显著减小。另一项值得注意的观察是，在本研究中所考察的各种补偿型轴承中，从最小流体膜厚度、流体膜刚度、阻尼系数以及稳定性阈值速度裕度的角度来看，恒定流量阀补偿型轴承在磨损或未磨损条件下运行于湍流状态时似乎更为合适。本研究表明，为了在磨损或未磨损条件下实现湍流工况下轴承性能的提升，必须合理选择流量控制装置的类型及其节流器设计参数的数值。 |
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