Variable structure with deflection hinge locking and shape memory alloy driving

Abstract

The invention discloses a variable structure with deflection hinge locking and shape memory alloy driving, and belongs to the technical field of aerospace engineering. The variable structure comprises a memory alloy wire driving expanding mechanism composed of a plurality of sets of memory alloy wire driving guide rod mechanisms, an expanding driving mechanism in the form of a hydraulic cylinder, an expandable shell made of an aluminum magnesium alloy material, a deflection mechanism and a deformation fine adjustment mechanism, wherein the deflection mechanism is achieved in the manner that a stepping motor drives a rotation hinge, and a memory alloy wire spring mechanism is adopted in the deformation fine adjustment mechanism. The expanding mechanism composed of the multi-level central memory alloy wire driving guide rod mechanisms is adopted, the SMA spring deformation fine adjustment mechanism is combined, and therefore the expandable shell can be driven by the expanding driving mechanism to be reliably expanded; and meanwhile the deformation fine adjustment mechanism can supplement the local deformation in the expanding process. The expandable shell can deflect by a certain angle through the deflection mechanism and is accurately locked through a hinge mechanism. The variable structure has wide application prospects in the aerospace field.

Description

technical field [0001] The invention belongs to the field of flying devices of aerospace technology. In particular, a variable body structure with deflection hinge locking, shape memory alloy actuation, Background technique [0002] With the development of aerospace technology, there are higher requirements for the flight performance of the aircraft, especially the structural design of the aircraft head will have a huge impact on the overall aerodynamic performance of the aircraft. However, the existing fixed aircraft head structure cannot realize the optimal adjustment of the shape of the aircraft head under different flight environments. Therefore, the present invention proposes a variable body structure with deflection hinge locking and shape memory alloy drive. Based on the aerodynamic characteristics of the existing suborbital vehicle shape, the length of the aircraft head and the deformed cross-sectional shape are lengthened. This invention is of great significance t...

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Problems solved by technology

[0003] According to the aircraft design data at home and abroad, combined with relevant literature, it is found that the existing aircraft head mainly has the following problems: (1) most of the aircraft head structure adopts the traditional streamlined design, the structure is fixed, and cannot change with the flight state; (2) ) At present, there is no deformable aircraft head applied to re-entry aircraft; (3) The local shape of the aircraft head cannot be adjusted accurately, and the optimization of the shape of the aircraft head cannot be guaranteed

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