脉冲干扰下网络反馈系统的性能极限

Performance limitation of networked feedback systems under impulse disturbance

研究网络环境下反馈控制系统的最优性能问题.综合考虑系统的跟踪误差和控制对象输入,通过H2范式给出性能指标函数式.针对网络反馈系统中参考信号为单位阶跃信号,从传感器通过通信信道将数据传给控制器的过程中受到脉冲干扰的问题,采用二自由度控制器来控制系统.给出了系统性能指标的下确界,其与控制对象频域下的增益以及系统的非最小相位零点密切相关;同时,输入信号的方向向量也对性能指标起决定性作用.通过仿真证明了系统的性能指标与控制对象本质特征之间的关系.

The optimal performance of networked feedback systems was studied.The performance index was concerned with the tracking error and plant input usage,which was expressed by H2 norm.For the networked feedback system,the reference signal is a step signal,and supposed there is an impulse disturbance from the sensor to the controller.Two degree of freedom controller was adopted to control the system.The infimum of the performance index of system was given,which is tightly dependent on the nonminimum phase zeros, the plant gain in the frequency range. At the same time, the direction vector of reference signal is the important element, too. Illustrative example is given to show the relationship between the performance and the intrinsic characteristic of plant.