【摘要】 针对现有铝电磁连续铸轧复合磁场控制系统存在的变频范围窄、控制不稳定等问题,通过分析电磁铸轧机理,采用SPWM交-直-交变频的设计方案。同时,由于现有控制系统是一开环系统,电磁铸轧铝板特性参数难以在线检测,提出建立基于标准支持向量机的晶粒度软测量模型的思想,并给出了基于软测量模型的形式化描述、设计原则及设计步骤。实验结果表明,改进后的系统能产生符合工艺要求的复合磁场,电磁场频率的作用范围为10～25Hz,换相周期数为1～5,谐波分量较小;同时生产出的铝板组织均匀,晶粒度达到1级水平。更多还原

【Abstract】 In order to solve the problems of narrow range of frequency conversion and unsteadiness control of the composite magnetic field control system in the existing aluminum electromagnetic continuous roll-casting(ACER) process, the principle of AECR and effects produced by electromagnetic parameter on quality of roll-casting sheet are analyzed. A design scheme of AC-DC-AC frequency inverter based on Sinusoidal Pulse Width Modulation(SPWM) is adopted in the system.A thinking of establishing a grain size soft-sensor model of SVM-based is advanced,also a formal description, a design principle and design steps of the SVM-based soft-sensor model are given,which provides a new approach for the on-line detection on the grain size of roll-casting aluminum sheet.The results show that a composite magnetic field according with technologic requirements can be produced by the ameliorated control system.The action sphere of the electromagnetic field frequency is 10～25 Hz,the number of commutation cycle is 1～5,and harmonic component is small.The aluminum sheet has homogeneous microstructure,of which grain size reaches the first-class level.更多还原