Optimization of transformable aircraft structures

Aeronautical and Space-Rocket Engineering


Аuthors

Phyo A. 1*, Semenov V. N.2, Fedulov B. N.3**

1. Moscow Institute of Physics and Technology (National Research University), 9, Institutskiy per., Dolgoprudny, Moscow region, 141701, Russia
2. Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia
3. Lomonosov Moscow State University, 1, Leninskie Gory, Moscow, 119991, Russia

*e-mail: okkarphyo501@gmail.com
**e-mail: Fedulov.b@mail.ru

Abstract

Aerial vehicles are the most efficient in terms of the structure weight. These products require a great amount work with optimization methods. A relatively novel optimization method, namely topological optimization, which gained wide acceptance while light structures design, may be marked out. Works demonstrating optimization results of various aircraft structural elements are being published quite often. Nevertheless, aerial vehicles are multi-mode devices, and special loading conditions correspond to each mode. This led to the transformable structures development. The advent of materials with the shape memory accelerated the search for the effective aircraft layouts in this direction. The general problem of these transformable structures optimization consists in the fact that the load-bearing element is under conditions corresponding to various modes of the aircraft operation. These are not herewith simply various loading cases, associated with loadings changes, but these are other fixations as well as possible structure deformation. A phase transformation occurred, and material “recollected” the other shape at the corresponding flight mode. Besides several structure loading cases, the method proposed in the article allows accounting for such changes as deformation, changing of linkages and boundary conditions. The authors considered the example of the transformable rib. An optimal distribution of the material for the load-bearing scheme selection with account for three diff erent flight modes was obtained.

Keywords:

transformable structure, shape memory alloys, the stress-strain state, optimization, topology

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