Vibration of pretwisted adaptive rotating blades modeled as anisotropic thin-walled beams

Problems related to mathematical modeling and dynamic behavior of pretwiste d adaptive rotating blades are considered. The blade is modeled as a thin-w all, single-cell beam encompassing nonclassical effects such as anisotropy, transverse shear, and warping restraint. The adaptive capabilities provide d by a system of piezoactuators bonded or embedded into the structure are a lso implemented in the system. Based on the converse piezoelectric effect a nd of out-of-phase activation, boundary control moments are piezoelectrical ly induced at the beam tip. Two feedback control laws relating the induced bending moments with the appropriately selected kinematical response quanti ties are used, and the beneficial effects of the implementation of the acti ve feedback control, considered in conjunction with that of the structural tailoring on the eigenvibration characteristics, are highlighted.