Industrial Dynamics


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INDUSTRIAL DYNAMICS

,,l inventory

' 1 AR (units) lunlsl #1 +61



_ .. 1500

-

- 13 Factory orders F.cl.,y distributors RRF (units /week) (units/week)\

tt

from t31

/ ' Factory

%

output SRF t20 % output SRF +200/. (units/week) +38% \ '

P_

tt?N _ \

:

= 2?3 p roduction

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/-20% \ l'

,

Pr°duction

w\ \ ' Retail sales RRR (units/week) \ pistributor IAF Factory inventory orders or from (units) \ RRD retail (units/week - 23

/

-10 -.

------

' /

/ l

i ,, /

NNNt

Manufacturing orders to factory

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,'

-62

,

%

% -

, warehouse Factory average order-filling

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2.6-week order - filling deloy

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(un'ts) 7 2 weeks' .roduction

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delay DFF (weeks)

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ss 500

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Factory warehouse untilled orders UOF *40.0 (units) \

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Distributory

70 2nd

- 55

MOF (units/week)

Dec

Feb Apr Jun Auq Oct

Limited Factory Capacity. So far we have considered only simple situations. Additional realities of company operation can be added as needed. In the preceding exhibits we assumed that the factory was able to produce at whatever level was desired. In a more realistic situation, with limited factory capacity, some surprising new effects develop. Figure 2-5 shows the effect of a maximum factory capacity limit that is 20% above the average sales level. As before, the system is completely stabilized at the beginning of the first year; then it is assumed that retail sales rise and fall 10% during each year. Retail sales never reach production capacity. Yet because of the inventory and pipeline effects, distributor orders to the factory do exceed its capacity. Furthermore, as factory deliveries

year

Feb Apr Jun

become slower, distributors begin to order further in advance of needs, and still more orders are put into the system. As a result the factory operates at full capacity for three months during the first year. Then inventory demands are filled at a time that coincides with falling retail sales. In the last half of the year, falling retail sales and inventory liquidation combine with the reduction of in-process orders which results from improving delivery. In the third quarter we see a combination of rapidly falling factory orders, a swiftly declining backlog of unfilled orders, and a suddenly rising factory inventory. The natural result is to curtail production from its maximum level, here falling to 62% below normal. Unlike the first year, the system now enters 30

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2-5

Figure

Effect of

/

limited level.

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factory limited

3

/

sales on fluctuating retail with manufacturing capacity to 20% sales 20% above average ,

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.

_ , 5

,i A RRR

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RRD \ A

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is

to

ventory

is

°.

excess

of

'

drops

at

a level

of

i

sharply Factory

output

to

below

79%

below

second

year below

production and

inventory is

year

that

come

slow.

pacity

for

In deliveries,

is

than

been

spite

of note

and 6 In

that

less

factory retail

from

the

weeks the

of

from than

factory, agement

to

inventories

a period

at

-

plans

reached

the

man-

lead

easily

expansion never

sales

was

backlog

circumstances might

undextake

from

9 months

order

the

condition

ca-

inventory

year, for

level;

the

may

production

second

August

that

occurrence

overexpand

from

retail

though

àn

entire

until

the

even

production

capacity. the

Explaining is

ganization

factory 4

quate of

and

produces

for

polioperating much as will act

system

desired

ca-

a week.

inventory

For

this

normal

sales

unless

2-5 to

below the

rising.

production

the

suspended and

year.

Figure

the

Viewed

a back-

meantime,

second in

November

rise

factory

represent

depleted to

low

at

orders

nearly

production

demand

full

remaining

'

the

company

pacity.

be-

at

a

was

the

see

lead

distributors' deliveries

in

We

broadened

runs

meet

normal

normal. has

inventory weeks'

to

a

when

production

months

rise

normal

years,

are chapged,

it did

second

distributors

succeeding

cies

rising,

the

per-

the

by

with

first-year

show

ahead

above

which

higher

the

from

sustained

Unfilled

345%

orders in

and

Factory 6

distributors.

log

orders

order

to

sales, result of

normal

is

imbalance

of

The

accentuation

above

tendency

state

average

Factory

61 %

peak

to

a

falling.

an

formance. to

in

the

7 week?s.

In the

months

almost

retail

average

'

8

manufactur-

in is

factory

production

sales,

curtailed

orders

the for

sales average

retail

This

unfilled Since

long-run equal

be

months.

and '

down.

necessarily

equal

constant.

which

start

in

must

at

point and

the

4

0

the peak

because

ing

in-

factory

shipments is

inventory

produced

79-

likeli-

inventories

when

peak

81st week

the

and

74, le

1 111.0.

in

has

must

–"" \

their

is little

Retail

a minimum.

orders;

a

sales.

retail

at

there

actually

reach

that

reach

-

that

losing

happen

therefore

'

jY

and

incoming

25

/

/

of

Note

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1,

hood

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/ N

13 %

[AF

\

.

only

slow

step

deviate

ment

a

the of

représentation particular is

to

control

determine

ways company '

31 1

:

first

_

an

the

cqrrent industry,

to

improve

success.

or-

industrial

step.

or

company

for

of

behavior

only

After

ade-

operations the

next

manage-

2000

11

-=-

11

1

r

Retail Inventory IAR (unifs)

1500 .

+72%

SRF with FaCtory output reduced clerical delays (units/week)

-

Retail RRR

.2 Z)

) Factory output SRF with stcindard - delays delays (units/week)

/

sale (units/week)

/ /"10%

---.

._ .

__._f____

1000 ,,, -

Factory inventory [AF (units)

____,_.

; warehouse UOF (units) (units)

Factory orders

,...-...,

unlilled unfilled

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