Sliding Mode Controller with Multisensor Data Fusion for Piezo Actuated Structure

The benefits of multisensor data fusion (MSDF) in controlling the piezo actuated beam structure using sliding mode controller (SMC) has been brought out. The first two vibrating modes of the smart cantilever beamare measured by two sensors namely, piezoelectric sensor and laser displacement sensor. The states are estimated from the sensors outputs using information filter, which were then fused and applied as input to the controller. The controller has been designed from the linear dynamic model of a piezo actuated beam, identified using linear recursive least square (RLS) method based on ARX model. A digital control system consisting of virtual instrumentation software LabVIEW, and USB data acquisition module NI 6008, was used for simulation and real-time control. Improved closed-loop performance was obtained when the controller designed used fused data, as compared to the closed-loop performance obtained with a single sensor. The beam structure considered in this work was a pilot model of the structures used in aerospace applications. Simulation and experimental results presented demonstrate the benefits of data fusion in controlling the vibration modes.Defence Science Journal, 2011, 61(4), pp.346-353, DOI:http://dx.doi.org/10.14429/dsj.61.111

Experimental evaluation of discrete sliding mode controller for piezo actuated structure with multisensor data fusion

This paper evaluates the closed loop performance of the reaching law based discrete sliding mode controller with multisensor data fusion (MSDF) in real time, by controlling the first two vibrating modes of a piezo actuated structure. The vibration is measured using two homogeneous piezo sensors. The states estimated from sensors output are fused. Four fusion algorithms are considered, whose output is used to control the structural vibration. The controller is designed using a model identified through linear Recursive Least Square (RLS) method, based on ARX model. Improved vibration suppression is achieved with fused data as compared to single sensor. The experimental evaluation of the closed loop performance of sliding mode controller with data fusion applied to piezo actuated structure is the contribution in this work