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Statistical control method based on measurement assurance plan

A control method and scheme technology, which is applied in the field of statistical control based on the measurement assurance scheme, and can solve the problem that the control limit cannot reflect the long-term variability of the quantity value.

Inactive Publication Date: 2010-07-07
SHANDONG ELECTRIC POWER RES INST
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Problems solved by technology

[0022] Therefore, in order to overcome the defect that the control limit of the existing statistical control method cannot reflect the long-term variability of the value, the present invention proposes a statistical control method based on a measurement assurance scheme, so that the measurement process is affected by uncontrolled system effects , and subject to statistical control for uncontrolled random effects

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  • Statistical control method based on measurement assurance plan

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Embodiment Construction

[0088] According to the technical solution of the present invention, this embodiment is based on the measurement assurance scheme statistical control method, which includes the following steps:

[0089] a) Under repeatability conditions, make n independent repeated measurements on the selected check standard;

[0090] b) Under the specified measurement conditions, repeat the measurement process of step a) at predetermined time intervals to obtain m subgroups in total;

[0091] Step a) and step b) are used to obtain preliminary data, which is the basic sampling data required to establish the control chart, and the sampling process is required to be in a random control state. Then the calculation of the initial data statistics is carried out, that is, step c) and step d).

[0092] c) According to the m subgroup data obtained in step b), the statistical control quantity within the group is obtained according to the following formula: mean value x, standard deviation s or range R...

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Abstract

The invention discloses a statistical control method based on a measurement assurance plan, which comprises the following steps: firstly, calculating the average value x of each sub group and the average value of the average values of m sub groups, which is the same as a Shewhart control chart; and then, calculating the intergroup standard difference sb according to the average values of m sub groups, and setting a control boundary according to sb, which is different from the Shewhart control chart. The corresponding center line CL, the upper control limitation UCL and the lower control imitation LCL are respectively shown as the accompanying drawing. Thereby, the control boundary does not represent the short-period mobility of the measurement, but also can reflect the long-term mobility of the measurement, so the plan can carry out the statistical control on the influence of the measurement process by the effect of an uncontrolled system and the influence of the measurement process by the uncontrolled random effect.

Description

technical field [0001] The invention relates to a statistical control method based on a measurement assurance scheme for a measurement process, in particular to a statistical control method for measuring equipment and measurement standards, and can also be adapted to the statistical control for production processes. Background technique [0002] A control chart is a graphical record of whether a measurement process is in a state of statistical control. It can judge and provide information on whether there are abnormal factors in the measurement process, so as to find out the cause of the abnormality, and take measures to bring the measurement process back into a state of statistical control. [0003] The control chart is divided into mean control chart and standard deviation control chart or range control chart. If the mean control chart is abnormal, it indicates that the measurement process is affected by uncontrolled system effects; and if the standard deviation control ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 范巧成祝福宋广清
Owner SHANDONG ELECTRIC POWER RES INST
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