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Aircraft part quality stability control algorithm based on T2 control chart

A quality stability, control algorithm technology, used in aircraft, machinery and transportation fields

Inactive Publication Date: 2014-08-06
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a T 2 control chart algorithm

Method used

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  • Aircraft part quality stability control algorithm based on T2 control chart
  • Aircraft part quality stability control algorithm based on T2 control chart
  • Aircraft part quality stability control algorithm based on T2 control chart

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] 1. Key features KC 1 and KC 2 The edge surface and the external surface of the wing rib respectively, determine the subgroup number m=10, the subgroup sample size n=3, input the measurement data of the test sample in excel, and calculate the sample mean value and the sample mean value of each subgroup Mean value (all calculation results are kept to four decimal places);

[0048] Table 1 KC value and mean

[0049]

[0050] 2. Calculation matrix

[0051] Table 2 ( x ‾ - x ‾ ‾ ) T

[0052]

[0053]

[0054] 3. Calculate the sample variance and sample mean variance of the i-th subgroup;

[0055] Table 3 Sample variance and mean variance

[0056]

[0057] 4. Calculate the covariance matrix of the sample and the average covariance of the sample;

[0058] Table 4 Sample covar...

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PUM

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Abstract

The invention provides an aircraft part quality stability control algorithm based on a T2 control chart, belongs to the technical field of mechanical devices and transportation and particularly belongs to the technical field of aircrafts. The aircraft part quality stability control algorithm can be used for aircraft part quality stability control and comprises the following steps of 1 confirming the KC (Key Character) number, the sample number and sample grouping which are used for jointly controlling the aircraft part / accessory delivery quality and have incidence relation; 2 calculating a sample covariance matrix S and an inverse matrix according to a statistic algorithm and further calculating a sample T2 value; 3 comparing the sample T2 value with upper control limit (UCL) and judging the normal situation; 4 appropriately decreasing the UCL according to T2 chart UCL correction rules if abnormality does not exist, comparing the T2 with the adjusted UCL and re-judging the abnormality situation.

Description

technical field [0001] The invention belongs to the technical field of mechanical devices and transportation, in particular to the technical field of aircraft, and can be used for quality stability control of aircraft parts. Background technique [0002] SPC (Statistical Process Control) is statistical process control. It uses statistical techniques to evaluate and monitor each stage of the process. It is a quality management tool to ensure that products and services meet the requirements. It analyzes the process status, forecast and identification of products Possible problems in the production process and other aspects have a significant effect. The control chart is the most important tool in SPC. It is a chart designed with statistical methods to measure, record and control the process quality. [0003] Due to the complex process of aircraft manufacturing process and many factors affecting quality, aircraft production process control cannot be completed by analytical tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G05B19/418G06Q10/06G06Q50/04
CPCY02P90/30
Inventor 闪四清辛腾龙么巍李苍艳石继红任婕陈向东张敏原钟俊周勉张守银张磊
Owner BEIHANG UNIV