derivative feedback
1.The ADRC is composed of nonlinear tracking differentiator (NTD) for feedforward control, an extended state observer (ESO), a nonlinear proportional-derivative controller (NPD) in the feedback path and disturbance compensation.
2.A two-stage,high precision spindle constant linear velocity(CLV) control method was developed for CD-R disk test instruments. The method is based on a digital PID(proportional-integral-derivative) controller and phase-locked loop,using the wobble clock read from the CD-R disk as the feedback signal.
3.By monitoring the current error of real-time control tasks and its derivative in real time, the fuzzy controller queries the fuzzy control decision-making table (FDT) and assigns priority to tasks dynamically, then the processor utilization is assigned to a task by feedback scheduler according to the priority.
