Dynamics of piezomaterials used in the optical systems

Complex piezodrives are frequently used in mechanisms of optical systems. They can be bimorph, axial and complex combined stacks. This paper deals with axial piezostacks used in piezoconverters. They make it possible to develop unipolar or bipolar motion which ensures the displacement to be dependent on each piezoelement of the compound stack sections. The bifurcation problem of a piezodrive has been solved by evaluating physical properties of piezoelements in piezostacs and sealing the material. It has made it possible to prove that piezostacs have a lot of static operation possibilities. The original solution of the actuator enabled the choice of optimal initial stresses in piezostacs. The experimental investigation of piezodrives with combined piezostacs has revealed the possibilities to optimize the design and materials for obtaining maximum displacement. These piezodrives may be applied in various systems like gyroscopes and telescopies.