Piezoelectric extension actuator

Abstract

It is the object of the invention to create a piezoelectric expansion actuator for d33 piezoelements, which allows vibrations in structures to be suppressed. This object is achieved pursuant to a solution of the invention in that the expansion actuator (1) comprises a piezoelectric stack (2), which consists of d33 piezoelectric elements and is arranged between output elements (4), which are attached to the surface of the structure (7). The invention applies to a piezoelectric extension actuator, which is used to control vibrations in structures. Another, alternative solution is based on the damping of vibrations between the main gearbox of a helicopter rotor and the cellular structure of the cockpit. The power application point of the output element (18, 19, 180, 190; 35, 36) is arranged at a distance from the corresponding end plate of the piezoelectric stack (22, 220; 31, 32, 33) in the axial direction (X).

Dependencies are inferred from the claim text.