Test and Data Analysis of Response Time of Control Rod Drive Mechanism
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摘要: 针对控制棒驱动机构（CRDM）机电响应时间快且测试环境存在噪声干扰等问题，搭建了一套集PXI数据采集硬件平台和MATLAB数据分析的快速机电响应时间测试系统，能够实现对高频控制棒棒位实时信号的快速采集。利用滑动平均滤波和分区间拟合方法对棒位位移信号进行滤波和拟合，并利用快速傅里叶变换（FFT）频谱分析法验证去噪效果。结果表明，本套测试系统能被成功应用于钍基熔盐液态堆（TMSR-LF1）第一停堆系统CRDM的机电响应时间测试中，在可行性、可靠性和可用性等方面均满足CRDM机电响应时间测试要求。
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关键词:
- 控制棒驱动机构（CRDM） /
- 响应时间 /
- 数据采集分析 /
- PXI /
- MATLAB
Abstract: In this paper, a set of a fast test system for electromechanical response time, using PXI data acquisition platform and MATLAB for data analysis, is built to measure the fast response time of the control rod drive mechanism (CRDM) and filter out the noise interference in the test environment. This test system can collect the real-time and high-frequency position signals of the control rod quickly and uses the moving average filtering and segmental curve fitting to filter and fit the position data of the control rod. Besides, the test system uses the FFT spectrum analysis to verify the effect of signal denoising. This test system is used in the electromechanical response time test of the CRDM in the first scram system of the thorium molten salt reactor-liquid fuel 1 (TMSR-LF1), demonstrating the test system in this study is consistent to the requirement of the CRDM electromechanical response time test on feasibility, reliability and applicability.-
Key words:
- Control rod drive mechanism (CRDM) /
- Response time /
- Data acquisition and analysis /
- PXI /
- MATLAB
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图 2 CRDM机电响应时间定义示意图
Figure 2. Schematic Diagram of CRDM Electromechanical Response Time Definition
图 3 CRDM机电响应时间测试系统结构图
Figure 3. Structure Diagram of CRDM Electromechanical Response Time Test System
图 4 运动-停止过程滤波效果对比
Figure 4. Comparison of Filtering Effect during Motion-Stopping Process
图 5 运动-反转过程滤波效果对比
Figure 5. Comparison of Filtering Effect during Motion- Reversal Process
图 6 运动-停止过程FFT频谱分析对比
Figure 6. Comparison of FFT Spectrum Analysis during Motion-Stopping Process
图 7 运动-反转过程FFT频谱分析对比
Figure 7. Comparison of FFT Spectrum Analysis during Motion- Reversal Process
表 1 运动-停止及运动-反转阶段多项式拟合统计参数对比
Table 1. Comparison of Statistical Parameters of Polynomial Fitting about Motion-Stopping and Motion-Reversal Process
控制棒状态 输入信号 SSE/10−5 RMSE/10−5 R-Sq Adj R-sq 运动-停止阶段 滤波前控制棒位移信号 8.16 5.31 0.9848 0.9848 滤波后控制棒位移信号 0.09 0.55 0.9998 0.9998 运动-反转阶段 滤波前控制棒位移信号 11.80 4.95 0.9876 0.9876 滤波后控制棒位移信号 0.26 0.73 0.9997 0.9997 
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表 2 响应时间测试结果
Table 2. Results of Response Time Test
控制棒设置 Ts/ms Tr/ms 棒速/(mm·s−1) 5 8 5 8 运动方向 提升 下降 提升 下降 提升 下降 提升 下降 第1组 35 63 56 20 156 181 93 151 第2组 30 44 44 33 104 239 70 135 第3组 54 68 60 47 108 215 89 123 第4组 60 48 21 24 128 224 76 125 第5组 38 37 40 73 117 211 115 116 最大值 68 73 239 151 最小值 30 20 104 70
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