【摘要】 针对热镀锌层厚度控制过程存在时变大滞后、非线性和多变量影响的特性,经常造成镀层厚度偏差过大且严重不均的问题.在分析镀厚与气刀压力、气刀与带钢距离和带钢速度关系的基础上,提出了应用自适应前馈结合无模型反馈的控制方法,通过控制气刀压力和气刀与带钢表面距离,实现了锌层厚度的自动控制.从仿真数据结果可以看出,对比PID控制方法,自适应控制策略能够有效地解决镀层厚度控制中的上述问题,保证较高的稳定控制性能和满足镀厚及镀层均匀性精度要求,实现了从手动调整向自动控制的实际应用.更多还原

【Abstract】 Due to the exsistence of large variable-time delays,nonlinearities and multivariable disturbances in the hot galvanizing coating thickness control processes,seriously coating weight error and nonuniform coating may usually happen.Based on the relative analysis of coating weight with air knives pressures,distances between air knives and strip speed,the model of adaptive feed-forward control and model-free adaptive feedback control were presented to control automatically air-knives pressure and position.An accurate and uniform zinc coating weight control is proposed and implemented.Simulation result showed that the precise and intelligent control schemes resolve effectively the above difficulties contrasting to PID control.The adaptive control model used in product application not only satisfy high quality control requirement but also change from manual adjustment to the automation control on coating weight.更多还原