STRUCTURE-CONTROL INTERACTION AND THE DESIGN OF PIEZOCERAMIC ACTUATED ADAPTIVE AIRFOILS

摘要

Structure-control interaction has been used beneficially to develop an adaptive airfoil that can be used in the cyclic and vibration control of a helicopter. The camber of the adaptive airfoil can be changed by using piezoceramic actuators. The deformations produced by the piezoceramic actuators are magnified using an elastic beam that can undergo large deformations with small strains. The needed camber change can be realized over a selected band of frequencies by appropriately tuning the level of structure-control interaction. In this paper, we discuss the use of two actuating surfaces, a piezoceramic sensor, and an active controller to develop a control surface that can produce cyclic camber changes and can be part of an adaptive airfoil.