The Study on Seismic Analysis and Test Method of Nuclear Grade Fan
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摘要: 针对某核级漩涡工艺风机开展了抗震分析和抗震试验研究,在试验基础上,得到了该类风机的抗震分析方法。首先建立核级风机有限元计算模型,通过模态分析得到风机的主要模态频率,并与动态特性探查试验结果进行对比;然后对比反应谱法分析计算与抗震试验中测得的应变结果。结果表明本文所采用的抗震分析方法是合理的,能够得到准确的地震响应结果。本文研究为采用抗震分析方法替代抗震试验提供了重要的依据。Abstract: In this paper, the seismic analysis and seismic test of a nuclear vortex process fan are carried out. Based on the test, the seismic analysis method of this kind of fan is obtained. Firstly, the finite element model of the fan is established, and the main modal frequencies of the fan are obtained through modal analysis, which are compared with the dynamic characteristic detection test results; Then, the strain of the fan is analyzed and calculated by the response spectrum method, and compared with the strain results measured in the seismic test. The results show that the seismic analysis method used in this paper is reasonable and can obtain accurate seismic response results, so it can be considered as an alternative to the seismic test of this kind of fan.
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Key words:
- Nuclear grade fan /
- Seismic analysis /
- Dynamic characteristics /
- Seismic text
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表 1 核级风机各方向主要模态频率
Table 1. Main Modal Frequency Results of Process Fan in All Directions
方向 振型 模态频率/Hz X 2 83.85 Y 1 70.96 Z 2 83.85 表 2 各方向主要模态频率结果
Table 2. Main Modal Frequency Results in Each Direction
方向 频率计算值/Hz 频率测量值/Hz 偏差/% X 83.85 87.67 4 Y 70.96 71.92 1 Z 83.85 91.15 8 表 3 应变计各测点计算值与测量值
Table 3. Calculated and Measured Values of Each Strain Gauge
应变计编号 应变计算值/10−6 应变测量值(去除本底噪声前)/10−6 应变测量值(去除本底噪声后)/10−6 S1 60 36 22 S2 49 33 21 S3 13 19 11 S4 22 25 17 S5 16 32 16 S6 60 55 40 S7 49 45 30 表 4 叶轮、传动轴和前后盖位移计算结果
Table 4. Displacement of Impeller and Front and Rear Covers
部件 使用等级 UX/mm UY/mm UZ/mm USUM/mm 叶轮 A级 0.0045 0 0.0187 0.0316 B级 0.0090 0.0108 0.0241 0.0393 C/D级 0.0132 0.0210 0.0291 0.0489 前后盖 A级 0.0836 0.0067 0.0260 0.0909 B级 0.0889 0.0189 0.0315 0.0943 C/D级 0.0939 0.0322 0.0366 0.0992 UX、UY、UZ—X、Y、Z方向位移值;USUM—总位移 表 5 叶轮和前后盖相对位移评定结果
Table 5. Evaluation Results of Relative Displacement for Impeller and Front and Rear Covers
使用等级 叶轮和前后盖相对
位移计算值/mm叶轮和前后盖相对
位移限值/mm叶轮与机壳间隙
计算值/mmA级 0.1225 0.6 0.8775 B级 0.1336 0.6 0.8664 C/D级 0.1481 0.9 0.8519 叶轮与机壳间隙设计值为1 mm(保守采用叶轮最大位移加上前后盖最大位移) 表 6 抗震试验前、后叶轮与机壳间隙测量值
Table 6. Measurement Results of Impeller and Casing before and after Seismic Test
部件尺寸 抗震试验前 抗震试验后 叶轮尺寸/mm Φ644.92×90.02 Φ644.92×90.02 叶轮与机壳间隙值/mm 1 1 -
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