12: INTEGRATED QUALITY ASSESSMENT METHOD

Lecture questions:

1. Integral indicator

2. Features of the application

3. The calculation of the integral indicator

1. Integral indicator

Integral indicator of the quality level assessed

products are found as a quotient from dividing the value of the integral

indicator of the properties of the evaluated product to the appropriate

in.oc

P

base value i.e.

Y



IN P

inbase

Integral quality score

P

called show

in

the most common form of effectiveness

the work of the product. The final indicator of the quality level of products

tion, including the technical level of industrial products,

There can be not only an integral indicator, but also a generalized

or complex, taking into account several different

essence of indicators, as well as the main (defining) indicator.

The final indicator is an indicator for which the total

assessment of the quality of the investigated products.

2. Features of the application

Integral quality indicator

the couple when the overall beneficial effect from

operation and total costs of creation and operation

products. Integral quality indicator is complex

indicator in the form of the ratio of the total beneficial effect of

operation to the total cost of its creation, the acquisition

installation, installation at the consumer and adjustment, etc.

The indicator is calculated as the ratio of the total

useful effect, expressed in natural units of

rhenium, from the use of the product to the cost of its creation and export

Lifetime Lifetime:

W

P



in



K



H



c

uh

or as the inverse ratio of these costs to the beneficial effect:



K

H



c 

uh

P

in



,

W

where W is the beneficial effect, i.e. the number of units of production or

full of work for the entire life of the product, for example

measures, the number of billets or parts produced, tons or kg of recycled

raw materials, etc .;

K

- total investment, including the wholesale price,

c

as well as the costs of installation, commissioning and other work;

H

- operating costs for the entire life of the product.

uh

Obviously, in the first case, the integral index

quality is characterized by the beneficial effect attributable to

one monetary unit of total expenses, and in the second - the sum

costs in rubles (or in other monetary units) attributable to

per unit of beneficial effect. According to the formulas can be

consider the integral indicator of product quality with the term

service up to one year.

With a product life of more than one year, the integral

quality indicator

P

calculated by the formula:

in

W

P



,

(12.1)

in

K



t

H

c

uh

Where



t

- correction factor depending on the service life

products t years.

The coefficient   t  is calculated by the formula:

t1

E

one





E



n

n



t

,

(12.2)

t



one



En





one

Where

E

- standard rate of return on investment,

n

usually taken to be 0.15

The calculation of the integral indicator for the presented

mule is fair under the following conditions:

- annual effect from exploitation or consumption

products from year to year remains the same;

- annual operating costs are also the same;

- service life is an integer number of years.

Estimated values ​​of the coefficient   t  for a period of up to 24 years

at

E

taken equal to 0.15, are given in table. eight.

n

Table 8

Calculated values ​​of the coefficient   t 

t



t

t



t

t



t

one

1,000

9

0.182

17

0.144

2

0.539

ten

0.174

18

0.142

3

0.381

eleven

0.166

nineteen

0.140

four

0,304

12

0.160

20

0.139

five

0,262

13

0.156

21

0.138

6

0.244

14

0.152

22

0.137

7

0,210

15

0.149

23

0.136

eight

0.194

sixteen

0.146

24

0.135

Somewhat simplistic, when life is not known

this product

in

P

calculated by the following formula:

W

P



,

(12.3)

t

Ying K



1

E





H

c

n

uh

here is the magnitude of the coefficient

E

accepted depending on

n

accepted standard term of use of the estimated i-

delia

3. The calculation of the integral indicator

For example, it is necessary to determine the integral technical

economic indicator of the quality level of the improved model

cutting machine comparing it with the base model. Exodus-

The data are given in Table. 9.

Table 9

Basic estimates of machine quality

Value of the indicator

Level of quality

estimated

basic

machine tool

machine tool

Annual productivity without

20

20

abandoned work, thousand det.

Downtime due to failures,%

3

6

The cost of the machine, thousand rubles

200

50

Annual repair costs, thousand rubles

2

four

Other annual operational

40

40

expenses, thousand rubles

Service life, years

12

3

Annual useful effect from operation of the basic machine

in view of downtime due to failures

bases

W

= 20 (1 - 0.06) = 18.8 thousand

details, and W estimated machine is equal to W

= 20 (1 - 0.03) = 19.4

Thousands of parts.

With a service life of machines more than one year and taking

n

E

= 0.15 integral quality indicator is calculated by

formula (12.1), and the values ​​of the coefficients   t  are found by

(12.2) or from table. 12.1.

Base Machine Integral Index

18,8

P



 0.30

thousand children / rub.

inbase

500,381

44

Integral rate of the machine being evaluated:

19.4

P

in



 0.26

thousand children / rub.

200 0,16

42

The quality level of the evaluated machine in comparison with

calling

0.26

Y





0.86

in

0.30

Consequently, an improved modification machine has

higher performance but more

expensive and therefore on the totality of properties, i.e. by quality,

blunt the base machine