本文選題：調(diào)節(jié)閥執(zhí)行機構　切入點：DDVC　出處：《山東大學》2011年碩士論文　論文類型：學位論文

【摘要】：調(diào)節(jié)閥是工業(yè)過程控制中最常用的控制元件之一,廣泛應用于化工、冶金、核電、火電等工業(yè)部門。隨著科技的發(fā)展和社會的進步,工業(yè)控制的系統(tǒng)化、智能化不斷提高,節(jié)能減排日益受到重視,對調(diào)節(jié)閥的技術性能要求也就越來越高。執(zhí)行機構是調(diào)節(jié)閥的關鍵部件,對調(diào)節(jié)閥的性能起著決定性影響。然而傳統(tǒng)執(zhí)行機構響應速度慢、能耗高、抗負載干擾能力弱,限制了調(diào)節(jié)閥性能的提高。因此,亟需研究新型執(zhí)行機構以提高調(diào)節(jié)閥的動靜態(tài)性能。本文全面總結分析了調(diào)節(jié)閥執(zhí)行機構的工作原理及特點,以提高執(zhí)行機構抑制負載干擾能力、增大輸出推力和速度為目標,開展了新型調(diào)節(jié)閥執(zhí)行機構的設計研究。 首先,研究了調(diào)節(jié)閥電液執(zhí)行機構的工作原理及優(yōu)缺點,將DDVC(直驅(qū)式容積控制,Direct Drive Volume Control)電液伺服系統(tǒng)應用于調(diào)節(jié)閥電液執(zhí)行機構,得到了一種新型電液執(zhí)行機構——DDVC電液執(zhí)行機構。闡述了DDVC電液執(zhí)行機構的工作原理,分析了其對于傳統(tǒng)電液執(zhí)行機構的優(yōu)點。同時對DDVC電液執(zhí)行機構進行了系統(tǒng)設計及元器件設計選型,初步實現(xiàn)了集成化結構設計的目標。 其次,基于齒輪泵的工作原理,對雙向齒輪泵進行了理論研究。通過內(nèi)部集成單向閥實現(xiàn)了齒輪泵的雙向工作。分別將齒輪泵壓油腔、吸油腔中的高壓油、低壓油引入相應的補償腔,實現(xiàn)了軸向間隙和徑向間隙的自動補償,減少了泄漏,提高了容積效率和工作壓力。 再次,根據(jù)DDVC電液執(zhí)行機構的工作原理,進行了系統(tǒng)機理建模。通過分析伺服電動機調(diào)速系統(tǒng)電壓-轉速特性及雙向齒輪泵控雙出桿對稱液壓缸的流量特性和力平衡特性等,建立了DDVC電液執(zhí)行機構的動態(tài)數(shù)學模型。在MATLAB環(huán)境下分析了系統(tǒng)穩(wěn)定性,結果表明系統(tǒng)穩(wěn)定,并且具有較大的穩(wěn)定裕度。 最后,利用MATLAB/Simulink,對DDVC電液執(zhí)行機構進行了控制策略仿真研究,對比分析了系統(tǒng)分別采用PID控制和PID校正的最優(yōu)狀態(tài)全反饋與觀測器預估干擾相結合的復合控制時的性能。仿真結果表明,采用PID控制系統(tǒng)的超調(diào)量和穩(wěn)態(tài)誤差均較小,但快速性較差,抑制負載干擾的能力弱,靜態(tài)性能較差；而采用PID校正復合控制后,響應速度得到明顯提高,抑制負載干擾的能力得到加強,動靜態(tài)性能均得到了很大提高。通過與國外相關產(chǎn)品的比較,所研究的DDVC電液執(zhí)行機構的綜合性能達到了國外產(chǎn)品的水平,有些指標甚至優(yōu)于國外產(chǎn)品,能夠滿足高性能調(diào)節(jié)閥的使用要求。
[Abstract]:Control valve is one of the most commonly used control components in industrial process control. It is widely used in chemical, metallurgical, nuclear, thermal power and other industrial sectors. With the development of science and technology and the progress of society, the systematization and intelligentization of industrial control are continuously improved. More and more attention has been paid to energy saving and emission reduction, and the technical performance requirements of the control valve are becoming higher and higher. The actuator is the key component of the control valve, which plays a decisive role in the performance of the control valve. However, the traditional actuator is slow in response and high in energy consumption. The capability of resisting load interference is weak, which limits the performance of the control valve. Therefore, it is urgent to study the new actuator to improve the dynamic and static performance of the control valve. In this paper, the working principle and characteristics of the actuator are summarized and analyzed. In order to improve the capacity of the actuator to suppress the load interference and increase the output thrust and speed, the design of the new actuator of the regulating valve was studied. Firstly, the working principle, advantages and disadvantages of electro-hydraulic actuator of regulating valve are studied. DDVC (Direct Drive Volume Control) electro-hydraulic servo system is applied to electro-hydraulic actuator of regulating valve. A new type of electro-hydraulic actuator, DDVC electro-hydraulic actuator, is obtained. The working principle of DDVC electro-hydraulic actuator is described. The advantages of the traditional electro-hydraulic actuator are analyzed, and the system design and component selection of the DDVC electro-hydraulic actuator are carried out. The goal of the integrated structure design is preliminarily realized. Secondly, based on the working principle of gear pump, a theoretical study is carried out on the bidirectional gear pump. The bidirectional operation of gear pump is realized by the internal integrated unidirectional valve. The low pressure oil introduces the corresponding compensation cavity to realize the automatic compensation of the axial and radial clearance, reduces the leakage, improves the volumetric efficiency and the working pressure. Thirdly, according to the working principle of the DDVC electro-hydraulic actuator, the system mechanism is modeled. By analyzing the voltage-speed characteristics of the servo motor speed regulating system, the flow characteristics and the force balance characteristics of the double-rod symmetrical hydraulic cylinder controlled by the bidirectional gear pump, etc. The dynamic mathematical model of DDVC electro-hydraulic actuator is established. The stability of the system is analyzed under the MATLAB environment. The results show that the system is stable and has a large stability margin. Finally, the control strategy of DDVC electro-hydraulic actuator is simulated by MATLAB / Simulink. The performance of the optimal state full feedback combined with observer predictive disturbance control with PID control and PID correction is compared and analyzed. The simulation results show that the overshoot and steady-state error of the PID control system are small. However, the speed is poor, the ability to suppress the load interference is weak, the static performance is poor, and the response speed is obviously improved and the ability to suppress the load interference is strengthened by using the PID correction compound control. The dynamic and static properties have been greatly improved. Compared with the related products from abroad, the comprehensive performance of the DDVC electro-hydraulic actuator studied has reached the level of foreign products, and some indexes are even better than those of foreign products. Able to meet the requirements of high performance regulating valve.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH137

【引證文獻】

相關碩士學位論文 前3條

1 張志波;電動擺式列車關鍵技術研究[D];西南交通大學;2012年

2 許茂林;直驅(qū)式電液調(diào)節(jié)閥穩(wěn)壓控制技術研究[D];山東大學;2012年

3 王志;電動調(diào)節(jié)閥動態(tài)特性與控制研究[D];山東大學;2013年

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本文編號：1622345