本文選題：輥筒彎曲試驗機 + 泵閥聯(lián)合控制�。� 參考：《江蘇科技大學》2017年碩士論文

【摘要】：隨著現(xiàn)代制造技術的發(fā)展,焊接結構及其組成材料越來越復雜、多樣化,特別是不等厚焊接接頭以及異種材料焊接接頭的應用越來越廣泛。常用的檢測方法是三點彎曲試驗法,該方法使用兩點作為焊接件的支撐點,第三點即焊縫點與彎軸對齊,彎軸在擠壓焊縫的過程中,焊接件容易發(fā)生移位現(xiàn)象,導致彎軸不能全部作用于焊縫,影響試驗效果,盲目使用這類焊接件可能會導致實際應用中出現(xiàn)失效斷裂問題。所以一旦在試驗中出現(xiàn)這種情況,只能重新選材加工,繼續(xù)試驗,這樣既延長了試驗周期,也耽誤了進度,同時造成材料、人工的浪費。因此,對不等厚焊接接頭以及異種材料焊接接頭彎曲檢測設備的需求越來越迫切。本文主要工作內容如下:(1)分析了泵控系統(tǒng)與閥控系統(tǒng)的應用及其優(yōu)缺點,對泵閥聯(lián)合控制、預測控制算法的研究現(xiàn)狀進行了介紹。研制了較為少見的兩輥彎曲試驗機,根據(jù)輥筒彎曲試驗機的功能特性,確定了泵閥聯(lián)合控制的工作方式。(2)根據(jù)輥筒彎曲試驗機的工作特性,對液壓系統(tǒng)進行簡化,建立了泵控液壓缸的傳遞函數(shù)。泵控部分利用預測控制算法來獲得變量泵的控制量,閥控部分利用電磁換向閥的優(yōu)化控制算法來獲得三位四通電磁換向閥的控制信號。(3)利用AMESim軟件建立了泵閥聯(lián)合控制液壓缸的模型,利用Matlab軟件完成了PID算法、電磁換向閥的優(yōu)化控制算法與預測控制算法的設計,聯(lián)合仿真后取得了預期的控制效果,證明了預測控制算法在泵閥聯(lián)合控制過程中的有效性。(4)運用工控機作為上位機,運動控制器作為下位機,搭建了泵閥聯(lián)合控制實驗系統(tǒng),利用VB.net和Matlab聯(lián)合編程,將算法實施到輥筒彎曲試驗機,驗證了仿真結果,有效地改進了泵閥聯(lián)合控制系統(tǒng)的性能,獲得了良好的控制效果。
[Abstract]:With the development of modern manufacturing technology, welding structures and their components are becoming more and more complex and diversified. Especially, the applications of welded joints with unequal thickness and dissimilar materials are becoming more and more extensive. The common detection method is the three-point bending test method, which uses two points as the supporting points of the welds. The third point is that the weld points are aligned with the bending shafts, and the bending shafts are prone to shift in the process of extruding the welds. As a result, the bending shaft can not act on the weld completely, which affects the test effect. Blind use of this kind of welding parts may lead to failure and fracture in practical application. Therefore, once this kind of situation occurs in the test, the material can only be selected and processed again, which not only prolongs the test period, but also delays the progress, and at the same time causes the waste of materials and labor. Therefore, it is more and more urgent to detect the bending of welded joints with unequal thickness and dissimilar materials. The main work of this paper is as follows: (1) the application of pump control system and valve control system and their advantages and disadvantages are analyzed. The research status of pump valve joint control and predictive control algorithm is introduced. A relatively rare two-roll bending testing machine was developed. According to the functional characteristics of the roller bending testing machine, the working mode of the combined control of the pump and valve was determined, and the hydraulic system was simplified according to the working characteristics of the roller bending tester. The transfer function of pump-controlled hydraulic cylinder is established. In the pump control part, the predictive control algorithm is used to obtain the control quantity of the variable pump. In the valve control part, the optimal control algorithm of the electromagnetic directional valve is used to obtain the control signal of the three-position four-way electromagnetic directional valve. The model of the pump valve joint control hydraulic cylinder is established by using AMESim software, and the pid algorithm is completed by Matlab software. The design of the optimal control algorithm and predictive control algorithm of electromagnetic reversing valve has achieved the expected control effect after the joint simulation. It is proved that the predictive control algorithm is effective in the process of the joint control of the pump valve, and the industrial control computer is used as the upper computer. The motion controller is used as the lower machine to build the experimental system of the joint control of the pump and valve. The algorithm is implemented to the roll bending testing machine by using VB.net and Matlab, and the simulation results are verified, and the performance of the joint control system of the pump and valve is improved effectively. Good control effect is obtained.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG441.7

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本文編號：2020957