基于预测控制的弯曲试验机泵阀联合控制方法研究

发布时间：2018-06-15 05:58

本文选题：辊筒弯曲试验机 + 泵阀联合控制　；参考：《江苏科技大学》2017年硕士论文

【摘要】：随着现代制造技术的发展,焊接结构及其组成材料越来越复杂、多样化,特别是不等厚焊接接头以及异种材料焊接接头的应用越来越广泛。常用的检测方法是三点弯曲试验法,该方法使用两点作为焊接件的支撑点,第三点即焊缝点与弯轴对齐,弯轴在挤压焊缝的过程中,焊接件容易发生移位现象,导致弯轴不能全部作用于焊缝,影响试验效果,盲目使用这类焊接件可能会导致实际应用中出现失效断裂问题。所以一旦在试验中出现这种情况,只能重新选材加工,继续试验,这样既延长了试验周期,也耽误了进度,同时造成材料、人工的浪费。因此,对不等厚焊接接头以及异种材料焊接接头弯曲检测设备的需求越来越迫切。本文主要工作内容如下:(1)分析了泵控系统与阀控系统的应用及其优缺点,对泵阀联合控制、预测控制算法的研究现状进行了介绍。研制了较为少见的两辊弯曲试验机,根据辊筒弯曲试验机的功能特性,确定了泵阀联合控制的工作方式。(2)根据辊筒弯曲试验机的工作特性,对液压系统进行简化,建立了泵控液压缸的传递函数。泵控部分利用预测控制算法来获得变量泵的控制量,阀控部分利用电磁换向阀的优化控制算法来获得三位四通电磁换向阀的控制信号。(3)利用AMESim软件建立了泵阀联合控制液压缸的模型,利用Matlab软件完成了PID算法、电磁换向阀的优化控制算法与预测控制算法的设计,联合仿真后取得了预期的控制效果,证明了预测控制算法在泵阀联合控制过程中的有效性。(4)运用工控机作为上位机,运动控制器作为下位机,搭建了泵阀联合控制实验系统,利用VB.net和Matlab联合编程,将算法实施到辊筒弯曲试验机,验证了仿真结果,有效地改进了泵阀联合控制系统的性能,获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.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG441.7

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