. (Quali-
II. Prolog
tative Differential Equation - QDE). QDE . (. 20.3). . : , (), (), .
. 20.3.
, . , , : , . . . , , , , . , . - . " " ( ). , . () , . 20.4.
(Laval)
(top)
(steady)
(inc)
'!.<:■."■
()
. 20.4, so
, . 20.4, . . : Level - zero/inc
, (zero) (top) .
20.
, zero top. , , , . , : Level = zero..top/inc
, , . Level = zero..top/std
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.
, . . .
Level. .
Amount. .
Inflow. ().
Outflow. ().
Netflow. (Netflow = Inflow -Outflow).
, (landmark). , (minf), (zero) (inf). , Level, (top), . , , minf Level. - . (Level) : zero < top < inf
(Amount) : zero < full < inf
. , .
, . Amount Level , . :
[ Amount, Level)
M'(X,Y) , Y- X: X Y . M0(x,Y) , Y X, , Y(0) = 0. , * (0, 0) . " (full, top). , + (X, Y) ";Y,X).
, , . (Amount, Level), , . ,
II. Prolog e
. : Amount = f(Level}
, . 20.5. , . , , . , , . , , , , . - , . ( , ).
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. 20,5. - .
, Outflow Level. , .
, , . 20.2. :
20,
[ Amount, Level)
Ko (Level, Outflow)
(Outflow, Netflow, Inflow)
deciv[ Amount, Netflow}
Inflow = constant = inflow/std
20.2,