层叠式推力箔片轴承静特性仿真及试验研究

徐科繁; 张广辉; 韩佳真; 黄钟文; 吉世伟

doi:10.13224/j.cnki.jasp.20220672

层叠式推力箔片轴承静特性仿真及试验研究

doi: 10.13224/j.cnki.jasp.20220672

1.
哈尔滨工业大学能源科学与工程学院，哈尔滨 150001
2.
中国航空工业集团有限公司金城南京机电液压工程研究中心，南京 211106

基金项目: 国家科技重大专项（2017-Ⅳ-0008-0045）

详细信息

作者简介:
徐科繁（1996-），男，博士生，主要从事气体箔片轴承研究

通讯作者:
张广辉（1982-），男，教授、博士生导师，博士，主要从事转子动力学研究。E-mail：zhanggh@hit.edu.cn

中图分类号: V245.3
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- 文章访问数: 146
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- 被引次数: 0
出版历程
- 收稿日期: 2022-09-08
- 网络出版日期: 2023-10-27

Simulation and experimental study on static characteristics of multi-layer thrust foil bearing

1.
School of Energy Science and Engineering，Harbin Institute of Technology，Harbin 150001，China
2.
Jincheng Nanjing Engineering Institute of Aircraft Systems，Aviation Industry Corporation of China，Limited，Nanjing 211106，China

摘要

摘要:
为阐明层叠式推力箔片轴承的流-固耦合机理，基于有限差分法和厚板单元建立了该轴承数值仿真模型，借助Newton-Raphson法将基于一阶滑移模型的可压缩雷诺方程线性化，基于迭代求解获取了该轴承静特性随工况参数的演变规律，搭建了层叠式推力箔片轴承起飞转速试验台，明确了起飞转速判断依据，数值结果和试验结果吻合较好。研究结果表明：当转速不大于20000 r/min时，考虑滑移边界后轴承承载力普遍下降3%左右，此时应考虑该影响。由于二次楔形效应，小间隙时轴承压力分布呈明显的“双峰”状。轴承间隙内摩擦状态的改变会导致试验数据波动，据此可确定轴承起飞转速。与文献数据和试验数据的对比结果表明，相关数值仿真模型更适用于分析轴承重载情况。
- 层叠式推力箔片轴承 /
- 滑移边界 /
- 有限差分法 /
- 静特性 /
- 起飞转速试验
Abstract:
A simulation model was established based on the finite difference method and the thick plate element to clarify the fluid-solid coupling mechanism of multi-layer thrust foil bearing. The compressible Reynolds equation based on the first-order slip model was linearized by the Newton-Raphson method, and the evolution law of the static characteristics with the operating condition parameters was obtained by iterative solution. The lift-off speed test rig of thrust foil bearing was built, and the judgment basis of lift-off speed was clarified. The numerical results were in good agreement with the experimental results. The results showed that when the speed was not more than 20000 r/min, the bearing capacity generally decreased by about 3% after considering the slip boundary, which should be considered. Due to the secondary wedge effect, the pressure distribution under small clearance presented an apparent “double peak” shape. The change of the friction state in the bearing clearance could lead to the fluctuation of the experimental data, based on which the lift-off speed could be determined. The comparison results with literature data and experimental data indicate that the simulation model is more suitable for analyzing the bearing under a heavy load.
- multi-layer thrust foil bearing /
- slip boundary /
- finite difference method /
- static characteristics /
- lift-off speed experiment

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图 1 层叠式推力箔片轴承

Figure 1. Multi-layer thrust foil bearing

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图 2 初始气膜厚度示意图

Figure 2. Initial film thickness distribution.

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图 3 厚板单元示意图

Figure 3. Thick plate element

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图 4 计算域及边界条件

Figure 4. Computational domain and boundary conditions

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图 5 轴承特性仿真流程图^[3]

Figure 5. Flow chart of simulation for bearing characteristics^[3]

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图 6 最小气膜厚度随承载力的变化曲线

Figure 6. Curves of the minimum of film thickness with load capacity

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图 7 网格无关性验证结果

Figure 7. Verification results of grid independence

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图 8 转速和间隙对承载力的影响

Figure 8. Influence of rotational speed and clearance on bearing capacity

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图 9 不同工况下轴承无量纲压力分布

Figure 9. Dimensionless pressure distribution under different working conditions

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图 10 不同工况下轴承无量纲箔片变形量分布

Figure 10. Dimensionless foil deformation distribution under different working conditions

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图 11 推力箔片轴承试验台

Figure 11. Thrust foil bearing test rig

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图 12 摩擦力矩和轴向载荷数据（F_pre=30 N）

Figure 12. Friction torque and axial load data （F_pre=30 N）

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图 13 不同预载荷下的起飞转速试验数据

Figure 13. Lift-off speed experimental data under different preloads

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表 1 层叠式箔片轴承的计算参数^[18]

Table 1. Bearing parameters of multi-layer foil bearing^[18]

参数	数值
扇形瓦外径R₂/mm	21.5
扇形瓦内径R₁/mm	12.0
扇形瓦块数N	8
大气压力p₀/Pa	101325
气体动力黏度μ/10⁻⁵ （Pa·s）	1.932
平箔片厚度t_f/mm	0.1
中间板厚度t_m/mm	0.12
支承板高度t_s/mm	0.5
箔片弹性模量E/10¹¹ Pa	2.1
箔片泊松比ν	0.3

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表 2 层叠式箔片轴承的计算参数^[19]

Table 2. Bearing parameters of multi-layer foil bearing^[19]

参数	数值
扇形瓦外径R₂/mm	57.15
扇形瓦内径R₁/mm	29.75
扇形瓦块数N	12
平箔片厚度t_f/mm	0.27
中间板厚度t_m/mm	0.12
支承板高度t_s/mm	0.8
转速Ω/10⁴ （r/min）	5
推力盘与轴承的间隙h_g0/mm	0.01

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