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Compensated positive position feedback for active control of flexible structures
Last modified: 2017-05-26
Abstract
This paper presents a compensated positive position feedback (CPPF) strategy for active control of flexible structures with piezoelectric actuators. In the proposed CPPF method, a negative feedback compensator is involved to remedy the deficiency of traditional positive position feedback (PPF) and to introduce roll-off characteristic at low frequencies. Thus, CPPF controllers can be developed with minimal influences on lower-order modes and cause no steady-state error to the controlled system. For demonstration purpose, the design processes and the effectiveness of the CPPF method are illustrated by active control of a cable net structure with integrated piezoelectric stacked actuators. The numerical simulations demonstrate that, compared to the conventional PPF method, the proposed CPPF approach overcomes the fundamental defects of frequency shift and spillover into lower-order modes, and achieves the goal of step-tracking with zero steady-state error. These comparative results confirm the efficacy and superiority of the proposed CPPF methodology in active control of flexible structures.