Aircraft skin seamless forming method and device based on T spline

Abstract

The invention provides a T-spline-based aircraft skin seamless forming method, which comprises the following steps that a T-spline-based aircraft body structure is constructed according to the size requirement of aircraft skin, and stretching operation is performed on grids at empennage and flank positions of the aircraft body structure on the basis of the aircraft body structure to form a T-spline-based aircraft skin structure; t spline control points are additionally arranged at the joints of the fuselage and the empennages and the joints of the fuselage and the side wings, so that a complete aircraft skin is constructed through one T spline curved surface, a traditional NURBS curved surface aircraft skin forming mode is replaced by introducing the T spline curved surface, the topological level can be coordinated with the aircraft structure design requirement, and the aircraft skin forming efficiency is improved. And the data volume of the aircraft skin model is greatly reduced, and a large number of control points which do not carry geometrical information are deleted, and thus the local fairness of the skin surface is effectively improved; the problems of incoordination of a topological structure and an aircraft structure design requirement, redundancy of the model data volume and poor fairness of the skin surface existing in the aircraft skin forming method of the NURBS curved surface are solved.

Description

technical field [0001] The invention relates to the field of computer-aided geometric design, in particular to a T-spline-based aircraft skin seamless forming method and device. Background technique [0002] Aircraft skin refers to the three-dimensional component that surrounds the frame structure of the aircraft and is fixed on the frame with adhesives or rivets to form the aerodynamic shape of the aircraft. The skin structure composed of aircraft skin and skeleton has a large bearing capacity and rigidity, but its own weight is very light, and it plays the role of bearing and transmitting aerodynamic loads. After the skin is subjected to aerodynamic action, the force is transmitted to the connected fuselage and wing frame. The force is complex, and the skin is in direct contact with the outside world. Therefore, not only the skin material is required to have high strength and good plasticity, but also a smooth surface. It has high corrosion resistance, so the design of ai...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for seamless forming of aircraft skin based on T-splines. By introducing T-spline curved surfaces instead of NURBS curved surfaces for aircraft skin forming models, the topological level can be coordinated with the requirements of aircraft structural design. Significantly reduce the data volume of the aircraft skin model, delete a large number of control points that do not carry geometric information, and effectively improve the local smoothness of the skin surface, so as to solve the topology structure and aircraft structure design of the NURBS surface aircraft skin forming method Inconsistent requirements, redundant model data, and poor skin surface smoothness

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