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  本文選題：閥門定位器　切入點：參數(shù)自整定　出處：《寧夏大學(xué)》2017年碩士論文

【摘要】：閥門定位器作為調(diào)節(jié)閥的配套設(shè)備,能很好地改善閥門的性能,提高控制精度,減少調(diào)節(jié)時間,在工業(yè)過程控制領(lǐng)域得到了廣泛的應(yīng)用。本文利用山武AVP100型閥門定位器的機械硬件部分,和吳忠儀表廠生產(chǎn)的AETS型調(diào)節(jié)閥作為研究的主體,自主設(shè)計控制算法程序,實現(xiàn)閥門的自動控制。在深入分析閥門定位器工作原理和開環(huán)階躍響應(yīng)測試結(jié)果的基礎(chǔ)上,提出以一階慣性加滯后的模型來表征實際的系統(tǒng)。運用兩點法、切線法、特征面積法等離線系統(tǒng)辨識方法,獲得數(shù)學(xué)模型的開環(huán)增益、慣性時間常數(shù)、滯后時間常數(shù)等三個參數(shù)。通過對比發(fā)現(xiàn),以兩點法獲得的數(shù)學(xué)模型,在不同的時刻,均能較為準(zhǔn)確的反應(yīng)系統(tǒng)的實際運動情況。以Matlab為仿真工具,在Simulink模塊中建立系統(tǒng)仿真試驗,采用較為成熟的Z-N經(jīng)驗公式法、ITAE法、內(nèi)�？刂品ǖ葘ID控制算法進(jìn)行參數(shù)整定,從理論層面上實現(xiàn)閥門定位器控制參數(shù)的自整定,為實驗設(shè)計提供經(jīng)驗參考。搭建實驗平臺,以LabVIEW為編程軟件,初步設(shè)計參數(shù)自整定控制算法。提出一種Bang-Bang控制算法,結(jié)果發(fā)現(xiàn):基于Bang-Bang控制的PID算法,能減少正行程的調(diào)節(jié)時間,提高控制的精度,滿足控制要求。
[Abstract]:The valve positioner, as the auxiliary equipment of the regulating valve, can improve the performance of the valve, improve the control precision and reduce the adjustment time. It has been widely used in the field of industrial process control.In this paper, the mechanical hardware part of the AVP100 valve positioner and the AETS type control valve produced by Wu Zhong instrument factory are used as the main body of the research, and the automatic control of the valve is realized by designing the control algorithm program independently.Based on the analysis of the working principle of the valve positioner and the test results of the open-loop step response, a model of first-order inertia plus hysteresis is proposed to characterize the actual system.By means of two-point method, tangent method and characteristic area method, the open loop gain, inertia time constant and hysteresis time constant of the mathematical model are obtained.It is found by comparison that the mathematical model obtained by the two-point method can accurately reflect the actual motion of the system at different times.Using Matlab as simulation tool, the system simulation test is established in Simulink module. The parameters of PID control algorithm are adjusted by using the more mature Z-N empirical formula method and internal model control method.The self-tuning of the control parameters of the valve positioner is realized theoretically, which provides an empirical reference for the experimental design.The experiment platform is built and the parameter self-tuning control algorithm is designed with LabVIEW as the programming software.A Bang-Bang control algorithm is proposed. It is found that the PID algorithm based on Bang-Bang control can reduce the adjustment time of the positive stroke, improve the control accuracy and meet the control requirements.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH134

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