带式输送机启动控制策略的研究-控制理论与控制工程专业论文.docxVIP

Research on Belt Conveyor Start Control Strategy ABSTRACT Belt conveyor has been widely used by coal, chemicals, metallurgy, mining, port, power and other industries. With the belt conveyor gradually to the direction of the long-range, heavy-duty, high-speed, startup problems have become increasingly serious. Belt conveyor system will produce distortion during the boot process. if take direct start or start-up time is too short, the acceleration will be bigger, so that make the visco -elastic deformation of the conveyor belt larger, eventually leading to a dynamic tension, impact directly on the conveyor system components and shorten their useful life. In addition, the belt conveyor working environment is relatively poor, so it also has certain requirements on the robustness of the controller. Therefore, the large belt conveyor start-up process is a very important research topic. In response to these problems, the paper does the work of the following aspects: First of all, use finite element analysis method to establish the dynamic model of belt conveyor system. The model focuses considering the viscoelastic properties of the conveyor belt, according to analyze the dynamic characteristics of several typical viscoelastic model, finally fix the Kelvin model as a dynamic model of the conveyor belt infinitesimal segment, then order all of infinitesimal segment dynamics model, eventually forming a simple kinetic model of the entire conveyor system. Second, start processing use the S-type speed controllable curve to control the belt conveyor acceleration. Belt conveyor start processing itself is an unstable process, S-type speed start-up curve can achieve the smooth start of the system, thus it can effectively reduce the shock of the system. Then, focus on the basic theory of the PID control, fuzzy theory, and on the basis of MATLAB, make a simulation experiment about the start of the belt conveyor, Laid the foundation for the discovery of the superior control theory. Fi