Variable Structure Control of Shape Memory Alloy Actuated Flexible Smart Structure

摘要

This paper presents the design of reaching law based discrete time sliding mode control for the SMA actuated cantilever beam to suppress the vibration in the presence of external disturbance. A linear dynamic model of the SMA actuated cantilever beam structure is experimentally established using online ARX RLS system identification approach. A digital control system that consists of simulink modeling software and dSPACE 1104 controller board has been used for identification. The VSC controller is designed starting with the switching surface design. The eigen values of the reduced order system are located suitably so that it lies inside the unit circle and the system is stable. The performance of the controller for vibration suppression and disturbance rejection was evaluated through simulation by exciting the structure at resonance.