本文選題：核電站 + 驅(qū)動機構(gòu)　； 參考：《電子科技大學》2014年碩士論文

【摘要】：目前,國內(nèi)核電站控制棒驅(qū)動機構(gòu)大多數(shù)均為磁力提升型驅(qū)動機構(gòu)(CRDM)。若驅(qū)動機構(gòu)發(fā)生故障或性能退化,則可能產(chǎn)生滑棒、卡棒等事故,從而影響反應(yīng)堆的安全經(jīng)濟運行。由于驅(qū)動機構(gòu)安裝在高溫高壓的密閉環(huán)境中,無法直接對其進行在線實時監(jiān)測。為盡早發(fā)現(xiàn)其性能退化的情況以便于及時進行調(diào)整,需定期對驅(qū)動機構(gòu)性能進行測試。以往由于缺少適用的試驗裝置,相關(guān)試驗由試驗人員采用通用測量設(shè)備測取數(shù)據(jù)并進行人工判斷。相關(guān)測試在停堆換料期間進行,由試驗人員臨時搭建試驗平臺,獲取試驗波形,通過人工分析電流時序、振動信號等方式來判斷驅(qū)動機構(gòu)性能。本課題采用虛擬儀器技術(shù),使用LabVIEW程序開發(fā)平臺,設(shè)計了驅(qū)動機構(gòu)電流監(jiān)測、振動信號分析、落棒波形判斷與抓取、落棒時間計算、棒位線性度分析、報表生成與存儲、歷史數(shù)據(jù)調(diào)用等功能模塊,實現(xiàn)了驅(qū)動機構(gòu)運行性能的綜合分析。本課題通過偽變化判斷濾除及棒位一致性判斷方法,自動消除實測棒位跳變輸入,保留其真實值,進而進行控制棒全行程內(nèi)的“給定棒位-實測棒位”線性度自動分析及判斷。利用控制棒下落速度與棒位探測器原邊線圈感應(yīng)電壓所存在的對應(yīng)關(guān)系,通過“起始斜率反推法”及“幅值-近似勻速下降段復合法”等算法精確判斷控制棒在下落期間所處的不同階段,進而實現(xiàn)對控制棒落棒時間的自動測量。并進行落棒時間符合度分析及不同控制棒落棒時間的橫向綜合比較分析。利用驅(qū)動機構(gòu)線圈電流波形在驅(qū)動機構(gòu)吸合動作點所呈現(xiàn)的特征點變化及線圈電流不同階段的變化特性,采用分段濾波、電流動作點凹槽捕捉、電流平臺微階躍捕捉等分析方法完成驅(qū)動機構(gòu)性能監(jiān)測。對驅(qū)動機構(gòu)重要性能指標進行監(jiān)測,自動判斷驅(qū)動機構(gòu)運行方向、分析其電流時序、根據(jù)運行電流獲取驅(qū)動機構(gòu)相關(guān)吸合點并結(jié)合驅(qū)動機構(gòu)振動信號進行綜合分析、自動計算驅(qū)動機構(gòu)電流轉(zhuǎn)換時間、對驅(qū)動機構(gòu)電流平臺進行穩(wěn)定性分析、自動計算驅(qū)動機構(gòu)動作點并進行合理性分析。并根據(jù)上述分析結(jié)果對驅(qū)動機構(gòu)運行性能進行綜合分析,進而對驅(qū)動機構(gòu)可能發(fā)生的性能退化進行預判。
[Abstract]:At present, most of the control rod actuators in domestic nuclear power plants are magnetic lifting actuators (CRDM). If the driving mechanism fails or the performance is degraded, the accident of sliding-rod and sticking rod may occur, which will affect the safe and economical operation of the reactor. Because the drive mechanism is installed in the closed environment of high temperature and high pressure, it can not be directly monitored in real time. In order to detect the performance degradation as soon as possible for timely adjustment, the performance of the drive mechanism should be tested regularly. In the past, due to the lack of suitable test equipment, the relevant tests were measured by universal measuring equipment and judged manually. The related test is carried out during the period of shutdown and reloading. The test platform is set up temporarily by the experimenter to obtain the test waveform and to judge the performance of the driving mechanism by manually analyzing the current sequence and vibration signal. Using virtual instrument technology and LabVIEW program development platform, the paper designs driving mechanism current monitoring, vibration signal analysis, rod drop waveform judgment and grab, rod drop time calculation, rod position linearity analysis, report generation and storage. The function module of historical data transfer realizes the comprehensive analysis of the performance of the driving mechanism. In this paper, the method of pseudo-change judgment filtering and consistency judgment is used to automatically eliminate the jump input of measured rod position, to retain its true value, and then to analyze and judge automatically the linearity of "given rod position-measured rod position" in the whole stroke of the control rod. Based on the relationship between the falling velocity of the control rod and the inductive voltage of the primary coil of the rod position detector, By means of "initial slope backstepping method" and "amplitude-approximate uniform descent section compound method", the different stages of the control rod in the falling period are accurately determined, and the automatic measurement of the control rod drop time is realized. The consistency analysis of drop-off time and the lateral comprehensive analysis of different control rod drop-off time are carried out. By using the characteristic point change of the current waveform of the driving mechanism coil at the driving mechanism suction action point and the variation characteristics of the coil current in different stages, the section filter is adopted, and the current action point groove is captured. The current platform microstep capture and other analysis methods are used to monitor the performance of the drive mechanism. Monitoring the important performance index of the driving mechanism, automatically judging the running direction of the driving mechanism, analyzing its current sequence, obtaining the relevant suction points of the driving mechanism according to the running current and synthetically analyzing the vibration signal of the driving mechanism. The current conversion time of the driving mechanism is calculated automatically, the stability of the current platform of the drive mechanism is analyzed, the action point of the driving mechanism is calculated automatically and the rationality is analyzed. According to the above analysis results, the performance of the driving mechanism is comprehensively analyzed, and the possible performance degradation of the drive mechanism is forecasted.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM623;TP311.52

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