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超高压成形机的压力控制系统研究

发布时间:2019-01-10 18:57  文章来源:笔耕文化传播
【摘要】:在飞机、航天器和汽车制造等领域,减轻重量、节约材料一直是人们长期追求的目标,也是现代先进制造技术发展的趋势之一。超高压成形技术正是适应这种需求而提出来的一种制造空心轻体构件的新工艺,其成形件具有重量轻、刚度好、后续加工量少等优点。但是,目前国内的超高压成形工艺尚处于起步阶段,很多问题都没得到良好的解决,在实际应用中也都是属于初级阶段。 本文针对超高压成形机的压力控制系统进行研究,文中综述了国内外的超高压成形技术的研究概况,阐述了超高压成形的原理和特点。在对液压成形技术进行充分调研的基础上,对液压成形机控制系统进行了整体设计。 本文建立了面向超高压系统应用的阀控非对称液压缸的数学模型,并根据建立的模型运用了MATLAB仿真工具进行了仿真分析,由仿真分析得出,所建立的阀控非对称液压缸系统的数学模型能够较好的描述实际系统,能够作为理论分析的基础。并且根据超高压成形机原理特点设计了减压阀控增压缸的压力控制系统,并针对该系统建立起数学模型,通过建立对比例减压阀控制增压缸的模糊自适应PID控制系统,对控制系统进行了仿真研究,模糊PID控制能够更好的抑制系统的超调作用,具有良好的自适应性,取得了较为令人满意的控制效果。经过分析验证,所设计的系统稳定可靠。
[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.
【学位授予单位】:东北大学
【学位级别】:硕士
【学位授予年份】:2011
【分类号】:TH137;TG305

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