Study on hydrodynamic characteristics of oil film of squeeze-film damper
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摘要:
针对单供油孔工况下挤压油膜阻尼器（squeeze film damper，SFD）阻尼性能演变规律不清晰的问题开展研究。针对挤压油膜阻尼器不同的间隙比、长径比、供油槽截面及位置，建立了流体域仿真模型，分析了结构和工况等因素对阻尼稳定性的影响规律，揭示了其对阻尼性能的影响机理。结果表明：增大偏心距、间隙比或减小长径比等有助于提高阻尼稳定性；增大进动频率、长径比或减小偏心距等有助于提高油膜阻尼值。在非对称供油工况下，正梯形截面供油槽可获得高阻尼，正方形截面供油槽阻尼更稳定；供油槽居中布置阻尼大，供油槽偏心布置则稳定性更优。该研究为单供油孔工况下挤压油膜阻尼器的设计提供了关键的理论支撑与优化方向，具有重要的工程指导价值。
Abstract:In order to solve the problem that the evolution law of the damping performance of squeeze film damper (SFD) under the condition of single oil supply hole is not clear, the fluid domain simulation model of the squeeze film damper was established. Various clearance ratios, length-to-diameter ratios, oil groove cross-sections, and positions were considered in the model. The influences of structural and working conditions on the damping stability were analyzed. The influence mechanism on the damping performance was revealed. The results showed that increasing the eccentricity, clearance ratio or decreasing the aspect ratio can improve the damping stability. And increasing the whirl frequency, aspect ratio or decreasing the eccentricity can help to improve the damping value of the oil film. Under asymmetric oil supply conditions, a trapezoidal groove provided higher damping, while a square groove offered greater stability. A centrally located groove maximized damping, whereas an eccentric placement enhanced stability. This study could provide crucial theoretical support and optimization guidance for the design of squeeze film dampers under single-oil-hole supply conditions, offering significant value for engineering applications.
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图 11 供油槽截面形状对油膜周向阻尼的影响曲线图
Figure 11. Influence of the cross-sectional shape of the oil supply tank on the circumferential damping of the oil film
图 12 不同供油槽截面形状下的等效阻尼
Figure 12. Equivalent damping under different oil supply groove cross-sectional shapes
图 13 供油槽不同位置下流体动态压力分布简图
Figure 13. Schematic diagram of fluid dynamic pressure distribution at different positions in the oil supply tank
图 14 供油槽偏心距对油膜周向阻尼的影响曲线图
Figure 14. Influence of eccentricity of oil supply tank on the circumferential damping of oil film
图 15 不同供油槽偏心距下的等效阻尼
Figure 15. Equivalent damping under different oil supply groove eccentricities
图 16 进动频率对油膜周向阻尼的影响曲线图
Figure 16. Diagram of the influence of whirl frequency on the circumferential damping of the oil film
图 18 间隙比对油膜周向阻尼的影响曲线图
Figure 18. Diagram of the influence of clearance ratio on the circumferential damping of the oil film
图 19 不同间隙比下的油膜力所作负功
Figure 19. Negative work done by the oil film force at different clearance ratios
图 20 长径比对油膜周向阻尼的影响曲线图
Figure 20. Diagram of the influence of the aspect ratio on the circumferential damping of the oil film
表 1 挤压油膜阻尼器参数表
Table 1. Structural parameters of squeeze film damper
参数分类 参数 数值 结构参数 内环半径R/mm 50 半径间隙C/mm 0.15 油膜长度L/mm 10 油膜偏心距e/mm 0.06 供油孔直径d/mm 1 滑油参数 密度/（kg/m3） 860 黏度/（Pa·s） 0.04 环境参数 供油压力/kPa 500 
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