發(fā)布時(shí)間：2018-03-11 10:34

  本文選題：泵閥聯(lián)合控制　切入點(diǎn)：變頻調(diào)節(jié)　出處：《新疆大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：電液伺服系統(tǒng)作為泵閥協(xié)控液壓缸的經(jīng)典系統(tǒng),在數(shù)控機(jī)床、鍛壓機(jī)械、船舶機(jī)械等一些高精度控制的機(jī)械領(lǐng)域得到廣泛應(yīng)用。但是常見(jiàn)的電液伺服系統(tǒng)普遍存在著能源利用率低,油源污染嚴(yán)重等問(wèn)題。而對(duì)于傳統(tǒng)容積調(diào)速的泵控系統(tǒng)則擁有很高的節(jié)能性,但是控制精度低的缺陷使得其一直無(wú)法在工程中得以運(yùn)用。所以為了解決電液伺服系統(tǒng)泵控高效節(jié)能性與閥控快速響應(yīng)性、控制精度高不兼容的問(wèn)題,進(jìn)而設(shè)計(jì)一種基于泵控單元實(shí)時(shí)變頻調(diào)速的節(jié)能性泵閥協(xié)控系統(tǒng)。首先對(duì)泵閥節(jié)能性控制系統(tǒng)做模型分析,然后對(duì)泵控回路和閥控回路做性能分析設(shè)計(jì)相應(yīng)的PID控制器來(lái)改善系統(tǒng)的性能。通過(guò)變頻器的矢量控制方案設(shè)計(jì)基于變頻調(diào)速的泵控回路。同時(shí)運(yùn)用模糊PID控制算法對(duì)油源壓力的變化實(shí)現(xiàn)平穩(wěn)快速的調(diào)節(jié)電機(jī)轉(zhuǎn)速。由于閥控回路中液壓缸位置精度受到外界信號(hào)的干擾,設(shè)計(jì)前饋補(bǔ)償PID控制算法對(duì)液壓缸位移在干擾前進(jìn)行補(bǔ)償。對(duì)蓄能器進(jìn)行模型的建立,在滿足泵控系統(tǒng)的穩(wěn)定性的同時(shí)驗(yàn)證通過(guò)泵口壓力的變化調(diào)節(jié)電機(jī)轉(zhuǎn)速的可行性,將蓄能器進(jìn)行性能分析。確定了蓄能器的選擇方案。通過(guò)AMEsim與simulink的聯(lián)合仿真,變頻電機(jī)的模型分析直接影響到所設(shè)計(jì)伺服系統(tǒng)的可實(shí)現(xiàn)性,因此改變電機(jī)的參數(shù)調(diào)節(jié)電機(jī)的性能。然后通過(guò)AMEsim將設(shè)計(jì)的基于變頻調(diào)節(jié)的泵閥節(jié)能性系統(tǒng)進(jìn)行模型的建立,在simulink中通過(guò)軟件的模塊程序化實(shí)現(xiàn)所需求的泵控模糊PID控制器和閥控前饋PID補(bǔ)償控制器的功能,最后將兩者進(jìn)行串口通信聯(lián)合仿真。通過(guò)分析比較設(shè)計(jì)的新型泵閥協(xié)控性系統(tǒng)在油源部分節(jié)能性相比傳統(tǒng)的電液比例伺服系統(tǒng)更好,同時(shí)因?yàn)榭刂撇呗缘脑O(shè)計(jì)響應(yīng)速度得到提升,控制精度更高,以及驗(yàn)證了控制策略的有效性。
[Abstract]:As the classical system of pump valve cocontrol hydraulic cylinder, electro-hydraulic servo system is used in NC machine tool, forging machine, Some mechanical fields with high precision control, such as marine machinery, have been widely used, but the common electro-hydraulic servo systems have low energy efficiency. The oil source pollution is serious and so on. But for the traditional pump control system with volumetric speed regulation, it has a high energy saving property. But the defects of low control precision make it impossible to be used in engineering. So in order to solve the problem of high efficiency and energy saving of pump control and quick response of valve control in electro-hydraulic servo system, the control accuracy is not compatible. Then a kind of energy saving pump valve cocontrol system based on the pump control unit real-time frequency conversion speed regulation is designed. Firstly, the model analysis of the pump valve energy saving control system is done. Then the performance of pump control loop and valve control loop is analyzed and the corresponding PID controller is designed to improve the performance of the system. The pump control loop based on frequency conversion speed regulation is designed by the vector control scheme of frequency converter. At the same time, fuzzy PID control is used to control the system. The algorithm can adjust motor speed smoothly and quickly for the change of oil source pressure. Because the position accuracy of hydraulic cylinder in valve control loop is disturbed by external signal, The feedforward compensation PID control algorithm is designed to compensate the displacement of the hydraulic cylinder before interference. The model of the accumulator is built to satisfy the stability of the pump control system and to verify the feasibility of adjusting the motor speed through the change of the pump inlet pressure. The performance of accumulator is analyzed, and the selection scheme of accumulator is determined. Through the joint simulation of AMEsim and simulink, the model analysis of frequency conversion motor directly affects the realizability of the designed servo system. Therefore, the parameters of the motor are changed to adjust the performance of the motor. Then the design of the pump valve energy-saving system based on frequency conversion regulation is built by AMEsim. The functions of pump control fuzzy PID controller and valve-controlled feedforward PID compensation controller are realized by software module programming in simulink. Finally, the simulation of serial communication between the two is carried out. Through analysis and comparison, the new type pump valve cocontrol system is better than the traditional electro-hydraulic proportional servo system in saving energy in the oil source part. At the same time, the design response speed of the control strategy is improved, the control accuracy is higher, and the effectiveness of the control strategy is verified.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273

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