Date post: | 07-Jul-2018 |
Category: |
Documents |
Upload: | ajay-vasanth |
View: | 218 times |
Download: | 0 times |
of 23
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
1/23
The Common Methods to
Determine the Parameters of
Technical Standards
Zhang Yue-yi
China Ji Liang University
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
2/23
Content
Introduction
Classification of quality characteristic
Methods to determine the technical parameters Methods to determine the specification limits
Conclusion
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
3/23
Introduction
There are always some technical
parameters and specification limits
in the technical standardsThe technical parameters and
specification limits of each
characteristic are all different
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
4/23
Classification of quality characteristic
!uality
characteristic
Measurement
characteristic
Countingcharacteristic
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
5/23
Classification of quality characteristic
Measurement
characteristic
the nominal the "etter
the smaller the "etter
the larger the "etter
m ± ∆ 21
m+∆
−∆or
0 x ≤ + ∆
x ≥ ∞ − ∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
6/23
Methods to Determine the Parameters
Parameter design
Quality function deploymentReliability design
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
7/23
Parameter design
Parameter design is the chief component of the
aguchi!s three stage design"
he basic idea of the parameter design is to determine
the optimal le#el of all technical parameters by usingthe orthogonal array and $%& ratio' including ra(
materials' electronic parts and components"
Mean(hile' in order to minimi)e the qualityfluctuation' (e must decrease the influence of all *inds
of interference by the parameter design"
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
8/23
Quality function deployment
!uality function deployment#!$D% is
the method of product design and
development driven "y customer& itadopts certain method to accurately
transform the customer demands into
the technical and process parameters
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
9/23
T h eh o u s e
of
q u al i t y ( H O Q
)
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
10/23
Reliability design
'elia"ility is the a"ility of the product
or system to perform and maintain its
functions in routine circumstances& aswell as hostile or une(pected
circumstances
'elia"ility design is to solve productrelia"ility at the design stage
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
11/23
Methods to Determine the specification limit
!uality loss function
Safety coefficient
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
12/23
Quality loss function
The quality loss function of the nominal the
better characteristic:
The quality loss function of the smaller the
better characteristic:
The quality loss function of the larger the
better characteristic:
2( ) ( ) L y K y m= −
2( ) L y Ky=
2
1( ) L y k
y
=
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
13/23
Quality loss model of the nominal
the better characteristic
)
*
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
14/23
Method to determine the loss
coefficient k
+hen the product "ecomes out of
use& that is to say& the ,uality
characteristic value is "eyond the
functional limit& the loss is )* yuan
Thus-
So& loss coefficient-
2
0 0 A K = ∆
0
2
0
Ak =
∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
15/23
Method to determine
If the product is un,ualified& the
rewor. cost of the product is )
yuan& the specification limit of the,uality characteristic is-
0
0
A
A∆ = × ∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
16/23
Examle
The target value of the output voltage of
the television power circuit is //01& the
functional limit & the loss of losing
functionality yuan
)、 Determine the loss coefficient of the
loss function2
25o V ∆ =
300o A =
0
2 2
0
3000.4
25
Ak = = =
∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
17/23
! 3、 If the rewor. cost of the un,ualified
product )4/ yuan& the specification limit of
the ,uality characteristic can "e determined
!hus' the technical parameter and specificationlimit of the output #oltage of the tele#ision
po(er circuit+
0
0
125 1.4
300
AV
A∆ = × ∆ = × =
115 1.4V ±
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
18/23
Quality loss model of the smaller
the better characteristic
2
0 0 A K = ∆
0
2
0
Ak =∆
0
0
A
A∆ = × ∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
19/23
Quality loss model of the larger the
better characteristic
2
0 0 K A= × ∆
2
1( ) L y k
y=
0
0
A
A∆ = × ∆
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
20/23
"afety coefficient
#: the loss of the unqualified roduct$
#%: the loss of the roduct that the
characteristic &alue is beyond thefunctional limit'
"afety coefficient:
(enerally) safety coefficient '
0 A
A
φ =
4 " 5φ =
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
21/23
the nominal the "etter
The relationshi bet*een the secification
limit and the functional limit△ △% of the
nominal the better characteristic:
Then) the secification limit :
0
0
A
A∆ = × ∆
0
ϕ
∆
∆ =
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
22/23
Conclusion
#s the customer demand is becoming
higher and higher) not only for roduct
erformance) but also for security)
economy) reliability) aearance quality)
ser&ice) etc'
The technical arameter and secification
limit of e&ery characteristic need to bedetermined by certain methods'
8/19/2019 5.the Common Methods to Determine the Parameters of Technical Standards
23/23
han* you,
5yysh6/78com