發(fā)布時(shí)間：2019-01-10 18:57

【摘要】：在飛機(jī)、航天器和汽車制造等領(lǐng)域,減輕重量、節(jié)約材料一直是人們長(zhǎng)期追求的目標(biāo),也是現(xiàn)代先進(jìn)制造技術(shù)發(fā)展的趨勢(shì)之一。超高壓成形技術(shù)正是適應(yīng)這種需求而提出來的一種制造空心輕體構(gòu)件的新工藝,其成形件具有重量輕、剛度好、后續(xù)加工量少等優(yōu)點(diǎn)。但是,目前國(guó)內(nèi)的超高壓成形工藝尚處于起步階段,很多問題都沒得到良好的解決,在實(shí)際應(yīng)用中也都是屬于初級(jí)階段。 本文針對(duì)超高壓成形機(jī)的壓力控制系統(tǒng)進(jìn)行研究,文中綜述了國(guó)內(nèi)外的超高壓成形技術(shù)的研究概況,闡述了超高壓成形的原理和特點(diǎn)。在對(duì)液壓成形技術(shù)進(jìn)行充分調(diào)研的基礎(chǔ)上,對(duì)液壓成形機(jī)控制系統(tǒng)進(jìn)行了整體設(shè)計(jì)。 本文建立了面向超高壓系統(tǒng)應(yīng)用的閥控非對(duì)稱液壓缸的數(shù)學(xué)模型,并根據(jù)建立的模型運(yùn)用了MATLAB仿真工具進(jìn)行了仿真分析,由仿真分析得出,所建立的閥控非對(duì)稱液壓缸系統(tǒng)的數(shù)學(xué)模型能夠較好的描述實(shí)際系統(tǒng),能夠作為理論分析的基礎(chǔ)。并且根據(jù)超高壓成形機(jī)原理特點(diǎn)設(shè)計(jì)了減壓閥控增壓缸的壓力控制系統(tǒng),并針對(duì)該系統(tǒng)建立起數(shù)學(xué)模型,通過建立對(duì)比例減壓閥控制增壓缸的模糊自適應(yīng)PID控制系統(tǒng),對(duì)控制系統(tǒng)進(jìn)行了仿真研究,模糊PID控制能夠更好的抑制系統(tǒng)的超調(diào)作用,具有良好的自適應(yīng)性,取得了較為令人滿意的控制效果。經(jīng)過分析驗(yàn)證,所設(shè)計(jì)的系統(tǒng)穩(wěn)定可靠。
[Abstract]:In the field of aircraft, spacecraft and automobile manufacturing, reducing weight and saving materials has been the goal that people have been pursuing for a long time, and it is also one of the trends of the development of modern advanced manufacturing technology. Ultra-high pressure forming (UHP) technology is a new technology for manufacturing hollow lightweight components, which has the advantages of light weight, good stiffness and less subsequent processing. However, at present, the domestic UHP forming process is still in its infancy, many problems have not been solved well and belong to the primary stage in practical application. In this paper, the pressure control system of ultra-high pressure forming machine is studied. The research situation of ultra-high pressure forming technology at home and abroad is summarized, and the principle and characteristics of ultra-high pressure forming are expounded. Based on the investigation of hydroforming technology, the control system of hydraulic forming machine is designed. In this paper, the mathematical model of valve-controlled asymmetric hydraulic cylinder for the application of ultra-high pressure system is established. According to the established model, the simulation analysis is carried out by using MATLAB simulation tool, and the result is obtained by simulation analysis. The mathematical model of valve-controlled asymmetric hydraulic cylinder system can describe the actual system well and can be used as the basis of theoretical analysis. According to the principle characteristics of the ultra-high pressure forming machine, the pressure control system of the pressurized cylinder controlled by the pressure reducing valve is designed, and the mathematical model is established, and the fuzzy adaptive PID control system for the pressure cylinder controlled by the proportional pressure reducing valve is established. The simulation of the control system shows that the fuzzy PID control can restrain the overshoot of the system better and has good adaptability and satisfactory control effect. It is proved by analysis that the designed system is stable and reliable.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH137;TG305

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