Active functionally graded structures in reduction and stabilization of vibration

Aim of project
The authors of the project present solutions to a number of fundamental research problems concerned with active reduction of vibration in continuous systems, where active damping and stabilization of vibration is based on the so-called active laminates and functionally graded piezoelectric materials. Such structures constitute interesting proposals for researchers dealing with problems of machine dynamics and questing for state-of-the-art technologies in that field. Recent progress in manufacturing technology has enabled production of monolithic piezoelectric ceramics with gradually variable polarization along the thickness of an object. A continuous gradient of piezoelectric activity lowers shear stress which leads to delamination. Particularly essential is the reduction of shear stresses along boundaries of an actuator at which propagation of the delamination process initiates. By making use of graded piezoelectric materials, one may create a polarization profile not only along the thickness, but within the actuator plane as well. This is vitally important in thin-walled two-dimensional structures like circular planes, annular shafts and shells. Electromechanical properties can also be shaped with actuator thickness by introducing variable concentration of active fibers along that direction. This way, graded materials exhibiting functional anisotropy can be developed.

Expected results
Papers in periodicals from the so-called ISI Master Journal List, domestic journals of international impact, numerous presentations at foreign scientific events.