被控对象为一个三环结构的伺服系统。伺服系统参数和控制参数在程序中给出描述。系统采样时间为1ms.根据是否加入摩擦干扰和前馈补偿分别进行仿真。-Charged for a three-ring structure of the servo system. Servo system parameters and control parameters described in the procedure are given. System sampling time of 1ms. In accord