SELF-CORRECTED PID VIBRATION CONTROL BASED ON DUAL-FREEDOM DUAL-DRIVE INTELLIGENT CANTILEVER BEAM ¹⁾

Along with the continuous progress of science and technology, the vibration control of the intelligent structure is now widely used in the aerospace, the machinery manufacturing, the vehicles and the ships. Due to the diversity and the complexity of the multi-input multi-output, the stability of the system is a serious concern. To deal with this problem, an adaptive control strategy is proposed for the dual-drive intelligent cantilever beam system with two input spouts. First of all, based on the linear piezoelectric equation, the mechanical model of the dual-drive intelligent cantilever beam is established by assuming the modes, and the state equation based on the closed-loop control system is obtained. At the same time, the proportional--integral--derivative (PID) controller is designed to self-correct the PID by using the parameters of the online identification system by the recurrent least square method. The control effect of the self-correcting PID control is analyzed by comparing the vibration of the two-input single-output dual-drive intelligent cantilever beam system under PID control by the numerical simulation. The control effect of the self-correction PID control for the dual-drive intelligent cantilever beam system of the dual-input single output is verified by experiments, and two different sets of single-input single-output self-corrected PID control experiments are compared. The results show that the self-correcting PID control method can effectively suppress the free vibration of the intelligent cantilever beam, which is more effective than the two groups of the single input single output systems. The two input single output self-correction PID control is better and more effective.