| With the development of economy, the dynamic batching system based on digital control has been widely used in processing industry, such as building materials, medicines, food, fodder and so on. And it plays a significant role in the process of production. Dynamic ingredient’s goal is to make the materials of product mixed according to certain proportion, and the accuracy of the blending ratio affects the quality of the products directly. But due to the dynamic batching is a system with strong coupling, large lagging and uncertain factors, the precise control of proportioning accuracy of raw material is difficult to achieve. So the study of dynamic batching system’ control method has important practical significance. According to the above problems, this paper use ADRC to design dynamic batching control system.Paper designs the overall structure of dynamic batching system based on its process analysis. It put forward the critical process and the main factors which affect the accuracy of the ratio of dynamic batching system through analyzing the implementation model and the basic function of the system. And it puts forward the overall structure of the dynamic batching system based on in.depth analysis of the system function, technical index and demands.The production environment of the dynamic batching process is very complex, it is difficult to determine the influencing factors, and the density and packing state of raw materials of the dynamic batching system is unpredictable. In view of these problems that matter the stability of the system, it puts forward to adopt the method of mechanism analysis, combining with the actual process of dynamic batching production line to build a simplified model of the key process of the dynamic batching system. It establishes feeder feeding model to make clear the relationship between the feed flow rate and the feed drive motor frequency; And it sets up the material impact influence model to clear about the impact of belt scale weighing sensor when the material falling down; And then it builds the belt scale weighing model to achieve the concrete implementation algorithm of the stantaneous flow and cumulative flow in dynamic weighing process. The steps above can provide the model and theory foundation for the subsequent implementation of the control algorithm of the dynamic batching system.In view of the problem that the dynamic batching system possess big lag and uncertain disturbance, but the the traditional PID control method cann’t solve the problem perfectly. So it put forward ADRC technique which is based on the thought of error elimination to dispose the uncertainty of the external and internal interference as a whole. On the basis of principle analysis for dynamic batching control system, it designs the first order tracking differentiator(adrc), the second order extended state observer, and the nonlinear feedback control rate. Then according to the ADRC designed it presents a simulation, compared with the traditional PID controller, to prove that ADRC has superiority in the precision ratio control process of dynamic batching system.On the basis of the mathematical model and control algorithm, and combining with the basic procedure and function, requirements and technical indicators of the production process, it achieves the design and implementation of the dynamic batching control system. It presentes the overall scheme and hardware and software of the dynamic batching control system in detail, and it analyzes the actual application process and effect of this control system. It further proves that ADRC is feasible and effective in the application of the dynamic batching system, at the same time it proves that ADRC applied in the dynamic batching system has strong robustness and anti.jamming performance. |
