STL model Boolean calculation based method for extracting inner surface model of fuel tank in airplane

Abstract

The invention discloses an STL model Boolean calculation based method for extracting an inner surface model of a fuel tank in an airplane. An STL file is generated through format conversion of an initial CAD model; the STL file is subject to topological optimization to generate point-line-surface index information and adjacent point-line-surface information; Boolean subtraction operation is performed between an encircled body A formed by the theoretical outline surface of the fuel tank and a real fuel tank model B, the crossed ways of triangular surface patches are classified, and grids are re-divided after crossing; and finally all surface patches of the two models are screened according to a logic relation of Boolean subtraction, reconstruction is performed to form a new model, and the rest surface patches are removed, so that the extraction of the inner surface model is realized. According to the method, the inner surface model is extracted from the complicated CAD model of the fuel tank in the airplane; the method has robustness and timeliness; the calculation complexity is dramatically lowered; and the method greatly runs ahead of similar existing methods.

Description

technical field [0001] The invention belongs to the field of computer graphics, relates to the extraction of the inner surface of the aircraft fuel tank by using the STL model instead of the original CATIA model in the design process of the aircraft fuel oil measurement system, and in particular relates to a method for extracting the inner surface model of the aircraft fuel tank based on the Boolean operation of the STL model . Background technique [0002] At present, the domestic research on the structure of the inner surface model of the aircraft fuel tank is based on the secondary development of CATIA 3D software. The general method is to construct a minimum bounding box entity slightly larger than the fuel tank model, and use the Boolean subtraction function of CATIA to use the bounding box Subtracting the crude oil tank will result in the inner surface model and the fragments that were originally outside the tank model and inside the minimum bounding box. In the proce...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: due to the complex definition of "rays" and "curves" in space, and the large amount of faces of the fuel tank model, this method has a high time complexity and strict requirements on the computer. Therefore, this method The scope of use is small, only suitable for tank models with simple structure

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