For the networked control systems with clock-driven sensors and event-driven actuators and controllers,supposing that the time-delay is uncertain and not more than one sampling period and the external disturbance is limited,the sufficient and necessary condition of the existence of suboptimal H_∞ control law for dynamical output feedback is derived by using Lyapunov theory and linear matrix inequality formulation,and optimal H_∞ control law design methods for dynamical output feedback are presented.
In coventional A/D schemes,a S/H unit is used prior to A/D ,therefore the converting time must be less than the sampling period. This limits the application of integral type A / D in areas where high sampling frequency is required.
In coventional A/D schemes, a S/H unit is used prior to A/D, therefore the converting time must be less than the sampling period. This limits the application of integral type A/D in areas where high sampling frequency is required.
The factors that caused the synchronous errors were analysed,three algorithms for software synchronization sampling,including cumulated deviation increment sampling,dynamically adjust sampling period and the best real time synchronization sampling,were explained.
By employing a frequency demodulation method of FM signal, the Doppler freguency shift of laser is gained, the time resolution of this method is just one sampling period, and both the Robust and convergent of this method are excellent, its precision is good enough.
Based on this idea and succeeding to some relative conclusion in open-loop system, we studied and proved some fault detectability condition of sensor and actuator faults in closed-loop system about feedback control matrix, observer matrix and sampling period.
The proper sampling period was between 6-9 weeks for early-, 7-10 weeks for mid-, and 9-12 weeks for late-maturing varieties after pollination based on the ripenning period of the female parent variety.