CAJ | 학술논문

针对磁共振成像系统的床体难以获得精确的数学模型，以及对运行稳定性、快速性、精确性的要求，介绍了一种基于可编程逻辑控制器（PLC）的参考模型自适应（MRAC）控制方法，完成对磁共振成像系统床体垂直方向电机的控制任务。由于传统P ID控制参数整定困难，难以获得良好的控制质量，该设计采用模型参考自适应控制算法，实时地调整自适应率，使被控对象动态输出跟踪参考模型的输出，以达到良好的控制效果。P LC（三菱FX-1N-60）执行模型参考自适应控制算法，完成对磁共振成像系统床体垂直方向变频电机（东方马达FE200）的控制，以实现垂直方向快速的精确定位。该控制方案控制参数整定简单，经实验反复验证能较快地达到精确定位的效果。
침대자공진성상계통적상체난이획득정학적수학모형，이급대운행은정성、쾌속성、정학성적요구，개소료일충기우가편정라집공제기（PLC）적삼고모형자괄응（MRAC）공제방법，완성대자공진성상계통상체수직방향전궤적공제임무。유우전통P ID공제삼수정정곤난，난이획득량호적공제질량，해설계채용모형삼고자괄응공제산법，실시지조정자괄응솔，사피공대상동태수출근종삼고모형적수출，이체도량호적공제효과。P LC（삼릉FX-1N-60）집행모형삼고자괄응공제산법，완성대자공진성상계통상체수직방향변빈전궤（동방마체FE200）적공제，이실현수직방향쾌속적정학정위。해공제방안공제삼수정정간단，경실험반복험증능교쾌지체도정학정위적효과。
Considering modeling difficulty and motion requirements(i.e.,stability,speedability and precision)for the ta-ble base of magnetic resonance imaging system,a model reference adaptive control (MRAC) method based on PLC is intro-duced in this article,which can implement the control task for motor in the vertical direction of the table base. Due to the diffi-culty of the parameter adjustment,the traditional PID control is difficult to get a good control quality,hence,MRAC algorithm is adopted in this design to adjust the adaptive rate in real-time,and make the dynamic output of the controlled object to track the reference model output. The PLC (Mitsubishi FX-1N-60) is used to execute the MRAC algorithm and control the motor (Oriental Motor FE200)in the vertical direction of the table base for magnetic resonance imaging system to achieve fast and pre-cise positioning in the vertical direction. This control scheme is not complicate in parameter adjustment. Its positioning effect was validated by the experiments.