Lattice Standard Elements and Lattice Structures for Aircraft Structural Design and Modeling

Abstract

The invention proposes a lattice standard unit and lattice structure for aircraft structural design and modeling. First, a lattice standard unit is defined. The geometric definition of the standard unit is 8 vertices of a cube and 6 centers of six faces. Point, which defines 8 special intersection points of the cube; formed by connecting in a specific way. And a sandwich structure formed by custom lattice standard cells according to the spacing of zero-period arrays. This sandwich structure is isotropic, lightweight, and has excellent mechanical properties. At the same time, by changing the aforementioned parameters, the structure can be diversified, and structures with different weight and mechanical properties can be obtained to meet different structural design requirements.

Description

technical field [0001] The invention belongs to the field of structural design, and in particular relates to a lattice standard unit and a lattice structure for aircraft structural design and modeling. Background technique [0002] The lattice structure is a hollowed-out grid-like structure similar to a honeycomb interlayer, which is characterized by three-dimensional periodic ordered pores, such as figure 1 , has excellent strength, stiffness, and light quality characteristics. This is a new type of structure that cannot be achieved by traditional processes. In recent years, with the rapid development of selective melting additive manufacturing technology, lattice structures have been widely used in aviation and aerospace. all aspects of the field. [0003] All lattice structures are formed by lattice standard cells according to certain arrangement rules, such as figure 2 , the lattice standard unit is the basic element of the lattice structure. To design and manufacture...

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Problems solved by technology

However, these lattice units generally have complex shapes, variable cross-sections, and large data volumes, such as Figure 4 , the amount of data of the formed lattice model is much larger than that of the conventional structural digital model, and the time to construct the lattice model is several times longer than that of the general model, and the structural force characteristics brought by different lattice units are also different. The selection of units is constrained by the software unit library

Occasionally, designers use self-designed units for lattice structure design, but due to the influence of the force characteristics of lattice units and the amount of model data, satisfactory results cannot be achieved

[0005] Although the lattice structure has been widely used at home and abroad, there is no software for lattice structure design in China, and there is no own lattice unit library. The real expression of lattice structure requires the application of some foreign software. , mainly including 3-matic software from Materialise, Addive workbench from GE, Netfab released by Autodesk, 3Dsimd from Ansys, etc. The latest version of CATIA launched on the V6 platform also has the capability of dot matrix design. These foreign software prices are relatively expensive. Computer configuration requirements are relatively high, some are not yet mature, and most design units have not yet introduced

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