DSPACE Implementation Of Hardware In Loop-real-time Simulation For Single Stand Reversing Mill

The simulation debugging of the mill’s control system is an experiment，which isestablished on the control system model. It is a necessary method in the design of mills.Such a control system designed by the program is applied directly to a mill, whose effectis not very good. When used in factory, it needs repeatedly debugging and modifying, oreven redesigning, which increases the cost of debugging. Therefore, whether the effect ofthe simulation and practical application can be more similar, it is critical to shorten thedebugging cycle, reduce costs and improve efficiency. In this paper, the DSPACEhardware in-the-loop simulation platform is made use of to achieve test on mill controlsystem. The practical controller is applied to the control system in the platform. Controlobject model with the help of the DSPACE real-time simulation computer’s real-timerunning designs a real-time mill closed-loop simulation system.First, this paper formulates a complete single-stand reversing mill mathematicalmodel. And it consists of the hydraulic pressure system, the speed system and tensionsystem. A simplified 2-DOF (degree-of-freedom) mill pressure system model isestablished on the basis of the nonlinearity and asymmetry of the electro-hydraulic servovalve, servo cylinder and mill deformation. Meanwhile, the current speed double closedloop speed regulation system model is also set up. Besides, taking into account theforward and backward slid values and the actual rolling speed of the strip steel, onesingle-stand unwrapping and coiling-up system tension model is built in this paper. Finally,offline simulation is developed after the three systems are coupled together by the rollingforce model.Second, this paper gives a detailed account of DSPACE hardware and softwaresystems, and also hardware-in-loop simulating technology. At the same time, the principleof the mill hardware-in-the-loop simulation platform is presented by the logical andpractical analysis. Moreover, the text summarizes the normal procedures of thehardware-in-loop simulation.Finally, this paper takes Yanshan University laboratory mill as the subject, hardware in-the-loop simulation platform is built, and meanwhile it proves the feasibility of theexperimental platform, which provides a more practical debug scenario to new-built millcontrol systems in future.