Dynamic analysis of aero-engine spindle ball bearings with thermal-mechanical coupling
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摘要:
为更准确分析航空发动机轴承动态特性,基于滚动轴承动力学理论和传热学理论,建立了一种航空发动机主轴球轴承热力耦合的动力学模型。采用预估-校正的GSTIFF变步长积分算法求解动力学微分方程组,分析了轴承供油体积流量和供油温度对轴承温度及轴承动力学影响。研究结果表明:球轴承高速运行时轴承动力学特性受轴承生热影响较大;增大供油体积流量有助于降低轴承温度以及减小钢球与保持架之间碰撞力,但过大的供油体积流量会导致轴承保持架振动增大;供油温度主要影响轴承温度以及润滑油黏度,保持架与引导套圈间的作用力随着供油温度的升高而降低。当供油温度在120 ℃时轴承保持架振动最小。
Abstract:In order to analyze the dynamic characteristics of aero-engine bearings more accurately, a thermal-mechanical coupling dynamic model of aero-engine spindle ball bearings was established based on the dynamic theory of rolling bearings and heat transfer theory. Then, the dynamic differential equations were solved using the GSTIFF variable step size integral algorithm, and the effects of bearing oil supply and temperature on bearing temperature and bearing dynamics were analyzed. The results showed that the dynamic characteristics of ball bearings were greatly affected by bearing heat generation when ball bearings were running at high speeds. When the oil supply increased, the bearing temperature and the collision force between the ball and the cage were reduced. However, too much oil supply could lead to an increase in bearing cage vibration. The oil supply temperature mainly affected the bearing temperature and lubricating oil viscosity. The acting force between the cage and the guide ring decreased with the increase of the oil supply temperature. The bearing cage vibration was minimal when the oil supply temperature was 120 ℃.
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表 1 各节点名称
Table 1. Name of each node
节点 节点名称 1 滚动体 2 钢球与内滚道接触点 3 轴承内圈 4 轴 5 钢球与外滚道接触点 6 轴承外圈 7 轴承座 8 环境温度 a 入油口润滑油 a1 轴承腔内润滑油 Q1 外圈滚道处热源 Q2 内圈滚道处热源 表 2 轴承主要参数
Table 2. Main bearing parameters
参数 数值 轴承外径/mm 180 轴承内径/mm 100 钢球直径/mm 22.225 初始接触角/(°) 33 钢球个数 17 表 3 试验轴承主要参数
Table 3. Main parameters of test bearings
参数 数值 轴承外径/mm 220 轴承内径/mm 150 钢球直径/mm 22.225 初始接触角/(°) 30 钢球个数 22 表 4 试验工况
Table 4. Test conditions
工况
序号转速/
(r/min)轴向力/N 径向力/N 供油
温度/℃1 10000 3300 1800 135 2 10000 3300 1800 155 3 14000 9800 2800 135 4 14000 9800 2800 165 5 16000 2900 3700 145 6 16000 2900 3700 165 表 5 试验结果对比
Table 5. Comparison of test results
工况
序号试验
结果/℃仿真
结果(1)/℃仿真
结果(2)/℃误差(1)/
%误差(2)/
%1 141.46 156.52 160.13 10.65 13.19 2 173.98 175.16 181.49 0.68 4.3 3 154.89 174.32 179.43 12.54 15.84 4 182.98 199.81 208.94 9.20 14.18 5 179.85 178.57 184.59 0.71 2.64 6 186.58 192.93 202.89 3.40 8.74 -
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