N-2-1 positioning based aircraft skin positioning deviation analysis method

An aircraft skin and skin technology is applied in the field of positioning deviation analysis of flexible sheet workpieces, which can solve the problems of inability to accurately calculate the contact stiffness of the flexible workpiece, difficult to accurately define the contact state between the flexible workpiece and the fixture, and easy deformation.

Inactive Publication Date: 2016-01-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The local Hertzian contact model is suitable for the positioning analysis of the rigid body model. In the actual positioning process of the flexible workpiece, the deformation of the flexible workpiece is global. Due to its low stiffness and easy deformation, any position affected by the external force will affect the entire workpiece. At the same time, because the frictional contact between the workpiece and the fixture is nonlinear, it is difficult to accurately define the contact state between the flexible workpiece and the fixture by using the Hertzian contact model, and it is also impossible to accurately calculate the contact stiffness during the positioning process of the flexible workpiece

Method used

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  • N-2-1 positioning based aircraft skin positioning deviation analysis method
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  • N-2-1 positioning based aircraft skin positioning deviation analysis method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] refer to figure 1 , an aircraft skin positioning deviation analysis method based on N-2-1 positioning, the steps are as follows:

[0026] 1. Data collection

[0027] according to figure 2 In the positioning scheme of the middle skin, the data of each positioning point and two measuring points on the skin are collected, including the position data of the positioning point and the error value of the positioning source of each positioning point, and the initial positioning point is determined as (2, 4, 5).

[0028] 2. Calculate the rigid positioning offset and determine the initial state of positioning

[0029] According to the deterministic positioning principle, the constraint equation F(q, r)=0 of the skin at the positioning point is established, and q is the coordinate of the key feature point, that is, the three positioning points (1, 3, 6) and two The measuri...

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Abstract

The invention relates to the field of flexible thin plate workpiece positioning deviation analysis, and discloses an N-2-1 positioning based aircraft skin positioning deviation analysis method. The method comprises the steps of firstly, determining an initial positioning state and a rigid positioning deviation of skin through deterministic positioning deviation analysis; and secondly, based on Matlab programming and finite element analysis software, realizing over-positioning deviation analysis of the skin through contact force change and deformation analysis in a skin multi-stage clamping process. According to the method, the initial positioning state of skin positioning and the influence of the contact force change in the skin clamping process on the skin deformation are fully considered, so that the influence of a skin practical positioning and clamping process on a final positioning deviation can be reflected more accurately.

Description

technical field [0001] The invention relates to the field of positioning deviation analysis of flexible sheet workpieces, in particular to an aircraft skin positioning deviation analysis method based on N-2-1 positioning. Background technique [0002] The aircraft panel structure is the basic structure of the aircraft fuselage. Its assembly accuracy directly affects the aerodynamic layout and assembly quality of the aircraft, and indirectly affects the safety performance and life of the aircraft. The skin is an important part of the aircraft panel structure, and the skin shape is the benchmark for the assembly of the panel structure, which determines that the positioning quality of the skin occupies an important position in the quality control of the aircraft assembly. [0003] When the traditional deviation analysis method based on dimensional chain is aimed at workpieces with low rigidity and needs to establish multiple constraints, the design of the dimensional chain is c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B64C1/12
Inventor 鲁聪汪洋霍灯升李俊英刘鑫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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