The measurement and control of the molten steel level are studied, which affect the quality of strip surface in strip casting. A system of molten steel measurement with a CCD (Charge Coupled Devices) sensor is designe...The measurement and control of the molten steel level are studied, which affect the quality of strip surface in strip casting. A system of molten steel measurement with a CCD (Charge Coupled Devices) sensor is designed, real-time measured data are given and its precision is analyzed. The level fluctuation model is derived, and an adaptive fuzzy-PID controller with supervisory control (AFPS) is proposed. The stability of the system is proved using Lyapunov theorem, and the simulation results are given when the model, the casting speed and the roll gap change. It is suggested that this kind of coupled nonlinear and time varying system is stable and robust using the designed AFPS controller.展开更多
An intelligent fuzzy-PID controller consisting of fuzzy logic controller and PID controller was developed to control the molten steel level of twin-roll strip caster.Additionally,a feedforward differential PID control...An intelligent fuzzy-PID controller consisting of fuzzy logic controller and PID controller was developed to control the molten steel level of twin-roll strip caster.Additionally,a feedforward differential PID controller was used for stopper position control in order to avoid differential kick.It is proved by simulation that the proposed intelligent controller is able to obtain zero steady state error asymptotically and the control system is robust due to its fuggy behavior of the controller.展开更多
为了提高钢坯连铸机结晶器内钢水液位的高度检测精度,设计了基于FPGA的差分电磁式钢水液位检测系统。检测系统由FPGA控制、差分电磁式传感器、高精度仪表放大器、锁相滤波处理、高精度A/D转换和4~20 m A输出等模块组成。检测系统测量范...为了提高钢坯连铸机结晶器内钢水液位的高度检测精度,设计了基于FPGA的差分电磁式钢水液位检测系统。检测系统由FPGA控制、差分电磁式传感器、高精度仪表放大器、锁相滤波处理、高精度A/D转换和4~20 m A输出等模块组成。检测系统测量范围宽,在结晶器钢水液面局部波动时,使检测输出的液位电流信号基本保持不变,提高了检测系统抗局部钢水波动的能力。经实际验证,系统具有测量精度高、成本低、可靠性高等特点,已在某钢铁企业替代捷克进口SH型液位检测设备投入运行。展开更多
文摘The measurement and control of the molten steel level are studied, which affect the quality of strip surface in strip casting. A system of molten steel measurement with a CCD (Charge Coupled Devices) sensor is designed, real-time measured data are given and its precision is analyzed. The level fluctuation model is derived, and an adaptive fuzzy-PID controller with supervisory control (AFPS) is proposed. The stability of the system is proved using Lyapunov theorem, and the simulation results are given when the model, the casting speed and the roll gap change. It is suggested that this kind of coupled nonlinear and time varying system is stable and robust using the designed AFPS controller.
基金Item Sponsored by National Natural Science Foundation of China(59995440)State Key Fundamental Research Project of China(G2000067208-4)
文摘An intelligent fuzzy-PID controller consisting of fuzzy logic controller and PID controller was developed to control the molten steel level of twin-roll strip caster.Additionally,a feedforward differential PID controller was used for stopper position control in order to avoid differential kick.It is proved by simulation that the proposed intelligent controller is able to obtain zero steady state error asymptotically and the control system is robust due to its fuggy behavior of the controller.
文摘为了提高钢坯连铸机结晶器内钢水液位的高度检测精度,设计了基于FPGA的差分电磁式钢水液位检测系统。检测系统由FPGA控制、差分电磁式传感器、高精度仪表放大器、锁相滤波处理、高精度A/D转换和4~20 m A输出等模块组成。检测系统测量范围宽,在结晶器钢水液面局部波动时,使检测输出的液位电流信号基本保持不变,提高了检测系统抗局部钢水波动的能力。经实际验证,系统具有测量精度高、成本低、可靠性高等特点,已在某钢铁企业替代捷克进口SH型液位检测设备投入运行。
