Connecting theory and practice with ADRC

From Qiang Xuesen[1],to Guan Zhaozhi[2],and finally to Han Jingqing[3],active disturbance rejection control(ADRC)arose from their unwavering conviction that the-ory must be connected to practice,and that control theory of any practical significance must not simply be a branch of mathematics,predicated on accurate mathematical model of physical processes.It is their vision and wisdom that have guided us through difficult times.