Piezoelectric Large Displacement Deformable Wing Based on Shape Memory Polymer Skin and Its Method

Abstract

The invention discloses a piezoelectric large-displacement deformation wing based on a shape-memory polymer skin and a method thereof. In the deformable wing, the piezoelectric driving device is composed of two layers of piezoelectric fiber composite bimorphs arranged in parallel. The leading edge of the wing is connected to the trailing edge through a piezoelectric drive device, and the wing ribs are connected to the protruding lugs of the bimorph. The active flexible skin is made of shape memory polymer, and the middle of the skin is fixed on the ribs, and the ends are fixed on the leading and trailing edges of the wing. When the wing is working, the active flexible skin will be transformed into a rubber state under the condition of energization and heating, thereby generating shrinkage stress and exerting axial pressure on the piezoelectric drive device, so that the piezoelectric device is in a compressed state, which contributes to the deformation during driving increase. When the wing is not working, the active skin is not energized and heated to keep it in a glass state without axial tensile stress, thereby avoiding permanent deformation of the piezoelectric bimorph under long-term axial pressure and improving the performance of the piezoelectric bimorph. life.

Description

technical field [0001] The invention belongs to the field of flight control of micro-miniature unmanned aerial vehicles, and in particular relates to a piezoelectric large-displacement deformation wing based on a shape-memory polymer skin and a method thereof. Background technique [0002] At present, the piezoelectric smart material is used as the driver, in order to increase its driving performance, that is, the output displacement, the method of axial precompression will be adopted. Applying an axial force to the piezoelectric bimorph reduces the bending stiffness. The force is generally applied by hanging weights, pre-stretched elastic bands and springs. Due to the initial bending of the piezoelectric bimorph during the manufacturing process, the axial force is applied for a long time, which will further increase the initial bending and eventually cause the bimorph to break. Therefore, how to avoid the defect that the piezoelectric bimorph with preset axial force is ea...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect that the piezoelectric bimorph with axial force preset in the prior art is easy to break, and to provide a piezoelectric large-displacement deformable wing based on a shape memory polymer skin and its method

Images