Abstract:  Large flexible platetype structures are widely used in aerospace field, though the structures are too easy to cause low frequency vibration. To solve this problem, the flexible hinged plate is selected as the research object so as to explore the vibration characteristics under external excitation in bending mode. An experimental platform for measuring and controlling the vibration of the flexible plate is set up. A stereo vision and a PZT sensor are used to detect the vibration information of the flexible plate, respectively. Based on the vibration information, the iterative learning control method with a variable forgetting factor is adopted to actively control the vibration of the flexible hinged plate, and the experimental results under PD control are used as a reference. The experimental results show that the iterative learning control is superior to PD control in both rapid attenuation of large amplitude and residual vibration suppression of small amplitude.

Key words: flexible hinged plate, vibration measurement, iterative learning control, variable forgetting factor