Experimental study on sliding mode variable structure vibration control for piezoelectric cantilever plate

Abstract

AbstractüSome flexible appendages of spacecraft are cantilever plate structures, such as sun plate, piezoelectric smart structure is used to suppress the multi-modal vibrations of the cantilever plate due to the parameter uncertainties and environmental disturbances.Optimal placement of piezoelectric actuators/sensors in active vibration suppression of flexible plate is conducted to control the vibrations of bending modes and torsional modes. The experimental facility of piezoelectric smart plate for active vibration control was designed and built up. A kind of gain select sliding mode variable structure control method is adopted. And experimental studies of identification and vibration control are conducted. The experimental results demonstrate that the adopted method can suppress the vibration significantly, and the strategy is feasible.

Hydrodynamic characteristics of the multi-level overtopping wave power device

“…However, it is difficult to design and construct. Compared with the fixed device, floating structure is difficult to study, there have been a lot study about floating structures, such as floating slab, 7 floating raft, 8 and so on. However, the floating of WEC has rarely been studied and the vibration of floating structure has a reduction on the overtopping discharge, tested in laboratory.…”

Experimental Study on Active Vibration Control of Flexible Manipulator Based on Improved PPF Algorithm

“…However, LQG, LQR algorithm depends on accurate mathematical model so that its application become complicated [1].Variable Structure Control usually shows high frequency fluttering in the vicinity of the slide plane origin point, so it affects its practical application. IMSC has the advantages of clear physical concept and easy to implement, but it needs multiple piezoelectric actuators in multi-modal control [2] . PPF algorithm has the advantages of simple and not sensitive to overflow, but there are dual character in the compensation damping ratio [3] , contradictory effects between robustness and low order modal control modes [4] .Direct velocity feedback method has the unconditional stability, but it is easy to control overflow [5] .In order to overcome the shortcomings of traditional PPF algorithm, PPF and negative feedback velocity method are combined in this paper in order to further improve the system damping.…”