Research on Calculation Method of Lower Radial Bearing Clearance of Main Pump of Nuclear Power Unit
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摘要: 俄罗斯百万千瓦级压水堆（VVER）核电机组主泵下部径向轴承间隙无法直接安装传感器进行监测，目前该机组采用俄供加密软件进行预测。为了解决设备老化带来的更新换代需求，需要开展主泵下部径向轴承间隙计算方法研究。首先建立了主泵轴承-转子动力学有限元模型，计算了不同位置和幅值不平衡激励下的转子径向振动位移响应，拟合得到了转子振动位移关系式。进一步结合现场已布测点的转子径向位移，建立了主泵下部径向轴承最小间隙计算方法，并开发了主泵下部径向轴承间隙计算预测软件。利用实际测量结果与软件计算结果进行了对比，结果表明，绝对误差最大为0.017 mm，误差百分比最大为 11.3%；绝对误差最小为0.001 mm，误差百分比最小为0.8%。
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关键词:
- 主泵 /
- 径向轴承间隙 /
- 预测软件；转子动力学
Abstract: For the Russian million-kilowatt pressurized water reactor (VVER) nuclear power units, the lower radial bearing clearance of the main pump cannot be directly monitored with installed sensors, and these units currently use Russian-supplied encrypted software for predictions. To solve the upgrading demand caused by equipment aging, it is necessary to research the calculation method of the lower radial bearing clearance of the main pump. Firstly, the finite element model of bearing-rotor dynamics was built. The radial vibration displacement response of the pump rotor under unbalanced excitation at different positions and amplitudes was calculated, which was further fitted to obtain the rotor vibration displacement relationship expression. Then, combined with the rotor radial displacement at the measured points, the calculation method of the minimum clearance of the lower radial bearing was established, and the calculation and prediction software of the lower radial bearing clearance of the main pump was developed. A comparison between actual measurement results and software calculations showed that the maximum absolute error was 0.017 mm (maximum percentage error: 11.3%), while the minimum absolute error was 0.001 mm (minimum percentage error: 0.8%).-
Key words:
- Main pump /
- Radial bearing clearance /
- Predictive software, Rotor dynamics
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图 2 转子系统简化示意图
x, y—转子径向轴心坐标，即偏离轴心线的振动位移，m。
Figure 2. Diagram of Simplified Rotor System
图 4 主泵下部径向轴承间隙计算技术路线
Figure 4. Calculation of Lower Radial Bearing Clearance of Main Pump
图 5 不平衡激励下的转子振动位移曲线
Figure 5. Rotor Vibration Displacement Curve under Unbalanced Excitation
图 6 不同激励倍数下的测点1转子径向振动位移
Figure 6. Rotor Radial Vibration Displacement at Measurement Point 1 under Different Excitation Multiples
表 1 轴承间隙计算预测软件验证结果
Table 1. Verification Results of Calculation Software of Bearing Clearance
序
号转子径向位移/mm 误差 测点1 测点2 下部径向轴承间隙
预测结果绝对值/mm 百分比/% 俄方软件 本研究软件 1 0.055 0.068 0.1275 0.1340 0.0065 5.1 2 0.058 0.066 0.1295 0.1260 0.0035 2.7 3 0.057 0.067 0.1305 0.1295 0.0010 0.8 4 0.063 0.067 0.1345 0.1240 0.0105 7.8 5 0.064 0.150 0.1460 0.1360 0.0100 6.8 6 0.098 0.111 0.1205 0.1175 0.0030 2.5 7 0.098 0.118 0.1215 0.1280 0.0065 5.3 8 0.069 0.151 0.1510 0.1340 0.0170 11.3 9 0.077 0.116 0.1285 0.1260 0.0025 1.9 10 0.065 0.158 0.1470 0.1385 0.0085 5.8 11 0.162 0.081 0.0770 0.0795 0.0025 3.2 12 0.154 0.085 0.0785 0.0755 0.0030 3.8 13 0.169 0.086 0.0800 0.0830 0.0030 3.8 14 0.069 0.147 0.1440 0.1470 0.0030 2.1 15 0.073 0.149 0.1475 0.1555 0.0080 5.4 
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