数控机床工作台的自适应模糊PID控制器设计

Fuzzy PID Adaptive Control for CNC Machine Tool Worktable

  • 摘要: 在现代机械制造领域,数控机床的加工精度和稳定性至关重要。数控机床系统存在的惯性扰动、动态耦合及非线性等因素导致工作台实际运动轨迹发生偏离,严重影响机床加工精度。本文创新性地设计了自适应模糊PID控制器,通过Adams/Matlab联合仿真技术实现工作台的运动控制。首先,在Adams环境中建立数控机床工作台系统的虚拟样机模型,定义材料属性、约束关系及接触参数,并构建同步带轮驱动系统。其次,通过Matlab设计数控机床工作台的模糊PID控制器,分析工作台速度与PID控制参数关系,设计模糊规则在线调节比例、积分和微分系数。最后,搭建数控机床工作台系统的Adams/Matlab联合仿真模型,在多种不同工作速度下验证控制效果。仿真结果表明,所设计的模糊PID控制器可有效控制工作台运行速度,为数控机床工作台高精度运动控制提供了重要的技术支撑。

     

    Abstract: In the field of modern mechanical manufacturing, the machining accuracy and stability of CNC machine tools are extremely important. Factors such as inertial disturbances, dynamic coupling, and nonlinearities inherent in CNC machine tool systems cause deviations in the actual trajectory of the worktable, which severely degrade machining accuracy. This paper innovatively designed an adaptive fuzzy PID controller. The motion control of the workbench was achieved through Adams/Matlab co-simulation technology. Firstly, a virtual prototype model of the CNC machine tool worktable system was established within the Adams environment. Material properties, constraint relationships, and contact parameters were defined, and a timing belt pulley drive system was constructed. Secondly, a fuzzy PID controller for the CNC machine tool worktable was designed in Matlab. The relationship between worktable velocity and PID control parameters was analyzed, and fuzzy rules were designed to perform real-time adjustment of the proportional coefficient, integral coefficient, and derivative coefficient. Finally, an Adams/Matlab co-simulation model for the CNC machine tool worktable system was built. The performance of the controller was validated at multiple different operating speeds. The simulation results demonstrated that the designed fuzzy PID controller effectively regulated the worktable operating velocity, providing crucial technical support for high-precision motion control of CNC machine tool worktables.

     

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