Formation of airframe power elements of the aircraft by means of topological optimization method
Journal Title: Інформаційні системи, механіка та керування - Year 2018, Vol 0, Issue 18
Abstract
The current implementation of the topology optimization (TO) method has the so-called problem of "vanishing elements", which implies that at imposing buckling constraints, the program can not reduce the density of any finite element (FE) below a certain point in which this element (called "vanishing") becomes too ductile, and, therefore, too unstable to meet the buckling constraint. This makes the algorithm useless because the program cyclically varies the value of the FE density between 0 and 1, but does not ignore such elements. Sogeclair faced this problem in the pylon optimization, so did Airbus in partnership with Altair in optimizing the A380 wing rib section. As a result, the design was too unstable and non-feasible, so it required additional modifications to meet the buckling constraint and other requirements. Thus, it is impossible today to integrate all the requirements for the design and possibility of variation of all parameters that can be changed in one optimization task. This leads to the fact that at each stage of the design cycle some criteria are missing, which does not lead to mass minimization. The conducted research proved the possibility of providing both force and stabilizing functions in the same structural elements of the airframe and the following method was developed: - first, by means of Altair Optistruct software package with 2D topological optimization function for 3D model optimal ways for load transfer in construction was determined and a geometric model of the pylon was built; - then, by imposing restrictions on the metal minimum thickness during topological optimization in this package, an optimal thickness of the metal is determined at each point of the model, taking into account both the requirements for strength and stiffness, and requirements for stability. This approach allows us to obtain a new design of the Boeing 747-400 engine pylon that is about 30% less than the weight of the traditional design, which confirms the prospects of the proposed approach in the scope of finding new ways to reduce the mass of aviation structures while maintaining the strength and rigidity of the product.
Authors and Affiliations
Oleg Volodymyrovich Dusheba, Vitaliy Viktorovich Sukhov
Keywords
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