Dynamic Behavior of Elastically Tailored Rotating Blades Modeled as Pretwisted Thin-Walled Beams and Incorporating Adaptive Capabilities

Abstract

A number of issues related with the vibrational behavior of rotating blades modeled as pretwisted thin-walled anisotropic beams, incorporating adaptive capabilities are addressed. The adaptive capabilities are provided by a system of piezoactuators bonded or embedded into the structure. Based on the converse piezoelectric e€ect and on the out-of-phase activation, boundary control moments are piezoelectrically induced at the beam tip. A feedback control law relating the induced bending moments with the kinematical response quantities appropriately selected is used, and its bene®cial e€ects, considered in conjunction with that of the beam anisotropy and structural pretwist upon the closed/open loop eigenvibration characteristics are highlighted.