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evaluated by means of a voftmeter or digital
voltmeter'
The detailed
steps necessary for problem solution will
be dis-
cussed in detail
in a later
section'
Briefly'
one must first
con-
s t r r r c t a m a t h e m a t i c a l m o d e l f o r t h e s y s t e m t o b e s t u d i e d . o f t e n s u c h
a model is not avail-able.
rn this
case, there are anal0g computer
: . -
techniques available
for generating a model fron äeta'taken
from the
p h y s i c a l s y s t e m . T h e n e x b s t e p i - n v o l v e s t h e c o n s t r u c t i o n o f a c o m p u t e r
nblock diagram" (an array of summing alnps, integrators'
etc')
r^rhich
obeys the same differential
equations as the systern model'
This dia-
g r a m i s t h e n u s e d t o c o n n e c t c o m p u t i n g e l e m e n t s u t i l i z i n g t h e p a t c h b o a r d .
S i n c e t h e p a t c h b o a r d m a y b e r e m o v e d f r o m t h e c o m p u t e r a n d a n o t h e r p a t c h .
board inserbed, it
is not necessary to use computer time otherSthan
for
actual
comPutation.
T h e p r o b l e m i s n o w r e a d y f o r c o m p u t e r s o l u t i o n . . A f t e r m o r r n t i n g
the proper patchboard, the potentiorneters
(u?otso) are set to
corre-
spond to the physical problem constants '
The computer solution
is now
obtained by pressing the
rtcoMPUTElt button.
?roblem variabfes
may then
be observed and recorded as desired.
Additional
runs may be rnade with
d i f f e r e n t p h y s i c a l c o n s t a n t s , p r o b l e r n v a r i a b l e s , i n i t i a l c o n d i t i o n s '
^ + ^
T h i s n a r r u a l d e s c r i b e s t h e c o m p u t e r o p e r a t i o n a n d p r o g r a r r r m i n g i n
d e t a i l . I t s h o u l d b e e m p h a s i s e d t h a t a k n o r ^ l l e d g e o f e l e c t r i c a l e n g i -
r i e e r i n g i s n o t ' n e c e s s a r y t o s u c c e s s f u l l y o p e r a t e a n a n a l o g c o m p u t e r '
T h e b l o c k d i a g r a n a p p r o a c h u s e d i n t h i s m a n u a l i s c o m m o n i . n n a n y f i e l d s . .
T h e m a n u a l d e s c r l b e s t h e g e n e r a l c o m p r r t e r o p e r a t i n g c o n t r o l s f i r s t .
T h i s i s f o l l o w e d b y a m o d u l e b y r n o d u l e d e s c r i p t i o n o f e a c h t ' b l a c k b o x n ,
- 2 -
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