.
, 1989-1998 . . , , .
40-60% , , .
, .
:
q | - | ; |
N | - | ; |
K | - | ; |
S | - | ; |
P | - | ; |
l | - | () , , ; |
m | - | , , ; |
X | - | ( ); |
T | - | ; |
q | - | ; |
d | - | ; |
L | - | ; |
Le | - | ; |
Lt | - | . |
, :
m < l, (1)
S < P, (2)
. , (1) , (2), , - , . , , , (1) (2).
, ( ). , .
1. , , .
m , . ,
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m < l. (3)
, , (3), . . . .
L. : . , ,
L=XST/2+K. (4)
, (4) : Le=(XST/2+K)/T.
Le=XS/2+K/T. (5)
, , m = /
= /m (6)
(5) (6),
L = XS/2 + Km/X (7)
, . , ,
> 0. (8)
, L ,
S/2 - Km/X2 = 0 .
(8),
= (2m/S)1/2. (9) (9) (6),
= (2m/S)1/2. (10)
(9) (7),
L = (2mS)1/2. (11)
(9) - (11) .
q ,
L = q (2KmS)1/2. (12)
(12) (11) q.
2. , , .
, , . , q , d. ,
q = X + d. (13)
. , , (3) * . * . d, .
, : 0 * * . * , , * , , . , - .
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Lt. : , . , , * , * , , :
Lt=XST*/2+dP(T-T*)/2+K. (14)
(14) , - , - .
Le. (14) .
Le=XST*/2T+dP(T-T*)/2T+KT. (15)
m , . m=q/T,
T=q/m. (16)
(16) (15), :
Le=XSmT*/2q+dPm(T-T*)/2q+Km/q. (17)
,
mT*=X, (18)
m(T-T*)=d. (19)
(13) :
d=q-X. (20)
(20) (19) :
m(T-T*)=q-X. (21)
(18), (20), (21) (17) :
Le=X2S/2q+(q-X)2P/2q+K/q. (22)
q, , ,
X > 0 (23)
q > 0 (24)
(22) Le X q, :
SX/q - P(q - X)/q = 0. (25)
-X2S/2q2 + P(q2 - X2)/2q2 - Km/q2 = 0 (26)
(25) - (26) . :
(S + P)X - Pq=0 (27)
Pq2 - (S + P)X2 - 2Km = 0 (28)
(27) - (28). (27)
q = X(S + P)/P (29)
(29) (28),
(X2(S + P)2)/P - (S + P)X2 - 2Km = 0
(23),
X = (2Km/S)1/2(P/(S + P))1/2. (30)
(30) (29),
q = (2Km/S)1/2((S + P)/P)1/2. (31)
(31) (16),
T = (2K/mS)1/2((S + P)/P)1/2. (32)
(30) (31) (22) , :
Le=(2RmS)1/2(P/(S+P))1/2. (33)
(20) (30)-(33) .
q, , q :
L=q(2KmS)1/2(P/(S+P))1/2. (34)
(34) (33) q.
3. .
, , , () l . .
, l (1), (3) . , m. , , , , .
. . , . 1 (1). 1 . 1 , 1 2 . 2 . 2 , . , .
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, : 2 2 . 2 , , 2 , , . , - .
, .
, Le
Le = (S 0òT1 (l - m)tdt + S T1òT2 (X - m)(t - T1))dt + PT2òT3 m(t - T2)dt + P T3òT (d - (l - m) (t - T3))tdt + K)/T (35)
(13) ,
0 < < q. (36)
q, (36).
Le Le q, (36).
:
X = (2Km/S)1/2(P/(S + P))1/2(1 - m/l)1/2, (37)
q = (2Km/S)1/2((S + P)/P)1/2(1 - m/l))1/2, (38)
d = (S/P)(2Km/S)1/2(P/(S + P))1/2(1 - m/l)1/2, (39)
T = (2K/mS)1/2((S + P)/P)1/2(1/(1 - m/l))1/2, (40)
Le = (2KmS)1/2(P/(S + P))1/2(1 - m/l)1/2, (41)
(37) - (41) .
q, , q
L = q(2KmS)1/2(P/(S + P))1/2(1 - m/l)1/2. (42)
(42) (41) q.
.
, (30)-(34), , (9) - (12), , (9) - (12) (30) - (34) , .
(33) (11).
(P/S + P)1/2 < 1.
, . , , .
, (30) - (34), , (37) - (42), , (30) - (34) (37) - (42) l, .
(33) (41). (1 - m/l)1/2 < 1.
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, . , , .
, , , , - , .
. (30 ) 3000 . . 20 (. .) . 57, 5 . . 100 . . , , , , ,
1) ;
2) , 36 . . .
3) 112.5 , 36 . .
:
1) X = q = 25 , d = 0, T = 6 , Le = 700 . ., L = 21000 . .
2) = 18.75 , q = 33.3333 , d = 14.5833 , = 8 , Le = 525 . ., L = 15750 . .
3) = 6.25 , q = 100 , d = 4.8611 , = 24 , Le = 175 . ., L = 5250 . .
1), 2) 3), , , . .
, , .