Στατιστική επεξεργασία δεδομένων_SPC.pdf
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Transcript of Στατιστική επεξεργασία δεδομένων_SPC.pdf
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,
SPC (Statistical Process
Control)
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-
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bias
:
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-
-
:
- -
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M
:
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&
:
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(
accuracy) :
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-
d
=
x
(
precision):
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(
standard deviation):
(
x
i
x
)
2
n =
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K Gauss
68.3 %
95.5 %99.7 %
x+2x-3 xx- x+x-2 x+3
x
x2x3
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()
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(mean average)
(median) (mode)
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(
, rsd %)
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()
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(CONTROL
CHARTS):
:
UCL
LCL
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(PROCESS
CAPABILITY) ()
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- :
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: USL
LSL
= USLLSL
=
(PROCESS
CAPABILITY) ()
x- x+x
(xi
-x
)
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(PROCESS
CAPABILITY) ()-
CP =
-
Z- = , Z- =
- = -min = min(Z-, Z-)
(USL-LSL)
6
(USL-x)
(LSL-x)
(-x)
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CPU = , CPL =
CPk = min(CPU, CPL), CPk > 1.33
CPU = CPL (
Z- = Z-)
.
(PROCESS
CAPABILITY) ()(LSL-x)
3
(USL-x)
3
