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An Analysis Method of Aircraft Skin Positioning Deviation Based on n-2-1 Positioning

A technology of aircraft skinning and analysis methods, applied in fuselage bulkheads, instruments, calculations, etc., can solve problems such as low stiffness, easy deformation, and inability to accurately calculate the contact stiffness of flexible workpieces

Inactive Publication Date: 2019-02-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

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

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  • An Analysis Method of Aircraft Skin Positioning Deviation Based on n-2-1 Positioning
  • An Analysis Method of Aircraft Skin Positioning Deviation Based on n-2-1 Positioning
  • An Analysis Method of Aircraft Skin Positioning Deviation Based on n-2-1 Positioning

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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 positioning deviation analysis of flexible thin plate workpieces, and discloses an aircraft skin positioning deviation analysis method based on N-2-1 positioning. The method includes: firstly, through deterministic positioning deviation analysis, determining the initial positioning state and rigid positioning deviation of the skin; secondly, based on Matlab programming and finite element analysis software, through the analysis of the contact force change and deformation during the multi-stage clamping process of the skin , to realize the over-positioning deviation analysis of the skin. The invention fully considers the initial positioning state of the skin positioning and the influence of the change of the contact force on the deformation of the skin during the skin clamping process, and can more accurately reflect the influence of the actual skin positioning and clamping process on the final positioning deviation.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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