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Reliability t-test method for pipeline loop test based on Malthusian model

An inspection method and reliability technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve problems such as low efficiency, waste, occupation of assembly line or library resources, etc., to improve efficiency, reduce blindness, and improve verification qualification rate effect

Active Publication Date: 2019-07-19
STATE GRID HEBEI ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manual re-inspection is still inefficient, and it will always occupy assembly line or warehouse resources in production scheduling, resulting in a large waste

Method used

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  • Reliability t-test method for pipeline loop test based on Malthusian model
  • Reliability t-test method for pipeline loop test based on Malthusian model
  • Reliability t-test method for pipeline loop test based on Malthusian model

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] For a meter sample X to be inspected, let the unqualified rate of the batch be r 1 , the false detection rate of the verification system is r 2 (Due to the characteristics of the system, the false detection rate only considers "abandoning the true" and ignoring the "taking the false"). The unqualified table generated during the system verification process is divided into two categories. One is that the sample itself is unqualified, which is counted as N 1 , and the other is system false detection, counted as N 2 . For the convenience of analysis, it is assumed that all the samples are tested once and then all are circulated. Cycle process such as figure 1 shown.

[0023] Then the relationship between the theoretical value of the number of unqualified meters under the cycle is:

[0024] N 2 (n+1)-N 2 (n)=-[1-(r 2 -r 1 r 2 )]N 2 (n)

[0025] Among them, n is the number of cycles, which can be seen from the formula, N 2 (n) is a convergent model in Malthusian ...

Embodiment 2

[0035] There are a total of 4000 three-phase electric energy meters in a batch, and the number of unqualified electric energy meters for the first cycle of inspection is 232, the number of unqualified electric energy meters for the second inspection is 55, and the number of unqualified for the third inspection is 46. The number of unqualified in the first test is 39, and the number of unqualified after 5 cycles is 32, then:

[0036] Test Question: H 0 : r'=32, H 1 : r′≠32

[0037] Taking α=0.05, the rejection domain of the inspection problem is:

[0038]

[0039] Existing n=5, t α (4) = 2.1318. calculated again S=117.24. Then there are:

[0040]

[0041] t does not fall into the rejection domain, so accept H 0 , that the equipment is reliable.

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Abstract

The invention provides a Malthusian model based reliability t examination method under streamline cyclic detection. The method comprises the following steps: bringing forward an original hypothesis H0 and an alternative hypothesis H1; actually obtaining a sample n times, and giving a significance level alpha; obtaining a sample expected estimation value; giving a rejection region according to a formula shown in the descriptions; and determining system reliability by use of a calculation result. According to the invention, a cyclic detection mode can be employed for an unqualified table, the streamline detection qualified level is effectively improved, and under a cyclic detection mode, the cycling frequency and the convergence speed of the unqualified table in cycling also reflect the reliability level of detection results of a meter and automatic equipment in a concentrated mode.

Description

technical field [0001] The invention relates to a reliability t test method under the cycle test of a pipeline based on a Malthusian model. Background technique [0002] In recent years, since the State Grid Corporation launched the "three sets and five major" reforms, each grid province has successively realized centralized measurement verification, and the automatic verification assembly line of electric energy meters has been popularized in the field of provincial measurement verification. In the full inspection and verification of electric energy meters after arrival, the automatic assembly line verification method saves a lot of labor costs, but also brings many new problems. First of all, automation equipment has limited intelligence and low fault tolerance rate. In each link, uncertain factors may be introduced due to design problems of equipment or system itself, which may lead to false detection of metering devices, resulting in a high failure rate of the entire bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/04
CPCG01R35/04
Inventor 杨鹏申洪涛吴宏波曹晓波孙勇强
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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