CAJ | 학술논문

为得到高精度的轧机机电液系统整体动态模型,将先进的控制理论应用于传统的轧制领域和提高板带产品质量精度,建立四辊轧机厚度控制系统动态模型,包括轧制过程模型、机架.辊系动态模型和液压伺服系统模型,将三个模型耦合并线性化,得到四辊轧机厚控系统多输入多输出(Multiple input multiple output,MIMO)线性化传递函数模型.考虑最终板厚质量指标,简化MIMO系统,得到基于测厚仪监控的板厚控制系统模型.利用H_∞混合灵敏度鲁棒控制理论,采用遗传算法优化选取加权函数,设计H_∞鲁棒控制器.仿真研究结果及与常规比例积分微分(Proportional integral derivative,PID)控制效果的比较表明,所设计的控制器对于厚度控制系统的外界扰动和参数不确定性具有较好的抑制性能,提高了测厚仪监控厚度控制系统的动态性能和稳定性.
위득도고정도적알궤궤전액계통정체동태모형,장선진적공제이론응용우전통적알제영역화제고판대산품질량정도,건립사곤알궤후도공제계통동태모형,포괄알제과정모형、궤가.곤계동태모형화액압사복계통모형,장삼개모형우합병선성화,득도사곤알궤후공계통다수입다수출(Multiple input multiple output,MIMO)선성화전체함수모형.고필최종판후질량지표,간화MIMO계통,득도기우측후의감공적판후공제계통모형.이용H_∞혼합령민도로봉공제이론,채용유전산법우화선취가권함수,설계H_∞로봉공제기.방진연구결과급여상규비례적분미분(Proportional integral derivative,PID)공제효과적비교표명,소설계적공제기대우후도공제계통적외계우동화삼수불학정성구유교호적억제성능,제고료측후의감공후도공제계통적동태성능화은정성.
In order to build high accuracy integral dynamic models of rolling mill system,apply advanced control theory in the traditional rolling field and improve the quality and precision of strip,dynamic model of gauge control system of 4-h mill is built,including the rolling process model,the mill stand-rolls dynamic model and the hydraulic servo system model.The three models are coupled and linearized,then the multiple input multiple output (MIMO) linear transfer function model of 4-h mill system is obtained.Simplify the MIMO linear model,considering the quality of the product,the plate thickness control system based on thickness gauge monitoring is obtained.The H_∞ robust controller is designed by using tlle H_∞ mixed sensitivity robust control theory.The weight functions are selected based on genetic algorithm.Simulation results and comparison with the effect of proportional integral derivative(PID) control show that the H_∞ robust controller designed has better disturbance attenuation performance for parameter uncertainty and external disturbance.The dynamic performances and stability of the thickness control system are improved significantly.