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连铸二次冷却过程控制水平的提高对提高连铸坯的质量和产量具有重要作用。为研究二次冷却设定控制算法,把铸流切片的生命周期模型与凝固传热模型相结合,对非线性热物性参数与凝固潜热进行处理,建立了二次冷却过程的动态仿真模型;并以此为基础研制了动态交互式仿真软件系统。系统由虚拟二次冷却对象、控制算法、监控操作、平台管理四个子系统组成;能够对板坯和方坯在非稳态浇铸工况下铸流的凝固过程进行仿真,得出暂态和稳态全过程的铸流内部温度场、凝固坯壳厚度、凝固终点位置、液相穴形状等的变化过程;给出二次冷却过程对输入与扰动信号的动态响应。系统在仿真过程中的人机交互、可移植性方面做了专门设计,为深入研究和优化二次冷却设定控制算法提供了有力的实验平台。仿真模型与仿真软件系统成功应用于某钢企二次冷却与轻压下设定控制系统的研制、测试与在线运行。
The control of secondary cooling process to improve the level of continuous casting slab to improve the quality and yield an important role. In order to study the secondary cooling setting control algorithm, the life cycle model and the solidification heat transfer model are combined to process the nonlinear thermophysical parameters and the latent heat of solidification, and the dynamic simulation model of the secondary cooling process is established. Based on this, a dynamic interactive simulation software system was developed. The system consists of four subsystems: virtual secondary cooling object, control algorithm, monitoring operation and platform management. The solidification process of slab and billet under unsteady state can be simulated, and the transient and steady In the whole process, the internal temperature field, the thickness of the solidified shell, the position of the solidification point and the shape of the liquid phase are also discussed. The dynamic responses of the input and disturbance signals to the secondary cooling process are given. The system is specially designed in terms of man-machine interaction and portability in the simulation process, which provides a powerful experimental platform for further research and optimization of the control strategy of setting secondary cooling. The simulation model and simulation software system are successfully applied in the research, testing and online operation of setting control system of secondary cooling and light pressure of a steel enterprise.