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Assembly gross error determination method and system

A judgment method and gross error technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficulty in delimiting confidence intervals and large uncertainties in assembly deviations

Active Publication Date: 2018-08-21
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Although the measurement information theory can mine the measurement data information of small samples, due to the large uncertainty of assembly deviation of complex structure products, if the gross error identification is only based on the measurement information theory, it is difficult to delineate the confidence interval of the gross error judgment

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Embodiment Construction

[0075] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0076] The object of the present invention is to provide a method and system for judging gross errors in assembly, which can improve the accuracy of the confidence interval of judging gross errors, and improve the accuracy of gross error identification and screening. Aiming at the characteristics of few assembly deviation measurement data and large uncertainty of accumulated deviation value, the invention proposes an assembly gross error judging method combinin...

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Abstract

The invention discloses an assembly gross error determination method and system. The method comprises obtaining a measured assembly deviation amount of an assembly matching surface; analyzing the variation range of the assembly deviation; performing finite element simulation on the variation range to obtain assembly deviation simulation data; removing a limit value in the assembly deviation simulation data, and obtaining confidence assembly deviation simulation data; grouping the confidence assembly deviation simulation data to obtain a plurality of assembly deviation simulation data sets; calculating the uncertainty interval of each assembly deviation simulation data set to obtain an assembly deviation qualified interval; fusing each assembly deviation simulation data set and a measured data set composed of the measured assembly deviation amount, to obtain a plurality of merging data sets; calculating the average uncertainty of all fused data including the same measured assembly deviation amount; and determining the measured assembly deviation amount corresponding to the average uncertainty outside the assembly deviation qualified interval. According to the technical scheme, the gross error recognition and screening accuracy can be improved.

Description

technical field [0001] The invention relates to the technical field of aircraft manufacturing, in particular to a method and system for judging gross errors in assembly. Background technique [0002] Deformation and springback of thin-walled parts, riveting interference and other unfavorable factors lead to greater uncertainty in aircraft assembly deviations. In recent years, with the rapid development of digital measurement equipment such as laser trackers, local GPS, and CCD industrial cameras, the introduction of digital measurement equipment in the aircraft development process has become the consensus of domestic and foreign aircraft manufacturing companies. Using digital measurement equipment can measure Assembly dimensional data. Making full use of and mining the information contained in the assembly size data is helpful for screening out the key factors affecting assembly deviation, grasping the key elements of aircraft assembly precision control, revealing the propa...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/18
Inventor 朱永国霍正书周结华徐雪峰
Owner NANCHANG HANGKONG UNIVERSITY
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