Active flutter suppression of composite plate with piezoelectric actuators

Abstract

This paper describes the use of piezoelectric actuators for the design of active flutter suppression system of a laminated composite plate-wing. The R,ayleigh-Ritz method is used t,o clevelop the equations of motion of a laminated plate-wing model with piezo actuators. State space aeroservoclastic mathematical model by Rational Function Approximation(RFA) of the unsteady aerodynamic forces is derived. T h e Mininlunt S ta te method combined with the optimization technique is adapted for RFA. The linear quadratic regulator theory is employed in active control of the system. T h e effects of flutter suppression or1 locations of piezo actuators are exanliiied. The opt imal placerne~lt of piezoelectric act.uators for f l l~t ter suppression subject to minimize the performance index is determined analytically by using the optin~ization technique. The results show the capability of piezo actuators for the control of wing flut,ter. Numerical simulations of a model with the optiuial actuators placement, show a substantial saving in control effort compared with the initial model.