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程序如下:
) l: ?4 W8 M1 h" w1 pMODEL 1
6 E) ~# D) o3 ?" u* DCONST Tmax (VAL:500) 7 n& u9 O: Q! I1 d6 q# m
Im (VAL:30.e3) M! e9 E: N/ {+ b/ f/ M
T1 (VAL:2.e-6)
0 P: a/ t' s$ G) XT2 (VAL:50.e-6) % v2 |2 j* l% A* z2 G% a$ r% B5 T
m (VAL:5) - [$ V2 ~! ^+ Z/ r" t0 }
c (VAL:3.e8) / X! l; Y" _+ @/ d3 K# P
v (VAL:1.1e8) & \4 I" H3 x3 e$ K: T. q0 o5 ]8 H
Io (VAL:1)
$ Y3 D, z Z, O* K3 M5 Cz (VAL:6) k# ^2 M2 g9 v$ R9 c- P4 m
INPUT UAP,UBP,UAN,UBN
2 h U8 p$ j( Z) r3 |' ODATA Y,XA,XB 9 R9 A# Q- Y1 l
OUTPUT UrAP,UrBP,UrAN,UrBN
1 H4 m" r: c2 S+ \9 _) x4 ^ IVAR UindA[0..1000],UindB[0..1000],dI[0..1000],3 N4 A7 N2 q! r! h5 q7 N& y, z( S
Tr,Ti,I,e,dt,UrAP,UrBP,UrAN,UrBN,
8 A7 r v. d0 W9 ~* k9 [7 o' u; _- vta,tb,b,n,L,x,Ko,Ui,Tj# G6 T/ z& a6 f
FUNCTION SQR(x):=x*x3 Q. [( W% C5 t; T& H& u
FUNCTION F(x,tr):=(x+b*b*(c*tr-x))/sqrt(sqr(v*tr)+(1-b*b)*(x*x+y*y))5 I2 V2 t6 r) |3 q; N8 y
FUNCTION U0(x,tr):=60*Io*z*b*(c*tr-x)/(y*y+sqr(b*(c*tr-x)))
0 h7 q1 P8 Q! u- G cHISTORY
& {* x2 b. }: ~4 L: K G! {+ |UrAP (dflt:0), UrBP (dflt:0)) i6 j1 g5 T7 ?
UrAN (dflt:0), UrBN (dflt:0)# w/ Q7 w- r$ ^! A1 r1 f0 \
UAP (dflt:0), UBP (dflt:0)
7 f; E) y3 c9 }' }1 @2 UUAN (dflt:0), UBN (dflt:0)
& ?% c3 g: R# S3 L6 U7 _INIT$ E5 |1 {. S2 ]! o0 D6 K
dt:= timestep
5 M# G: m1 G: E4 _b:=v/c; q( w {9 L2 r- h. N
L:=XA-XB
m) C* m. b2 U( JFOR Tj:=1 TO 2 DO4 c2 I' f) t4 G' S
if Tj=1 then
' l$ h* \0 m5 r( Nx:=XA
4 x5 W* Z+ R6 _0 b& Uelse! Q8 Z2 ~; S- a* b( F/ Z
x:=-XB
! d8 j4 \; K+ m( {( x8 Jend if- b" P1 s; u c* z4 {
ta:=sqrt(x*x+y*y)/c& J9 r ~5 U; e$ q, \
tb:=sqrt(sqr(x-L)+y*y)/c$ }+ S4 c' Z2 ]3 R2 p1 A" l' t# {- W
FOR Ti:=0 TO Tmax DO
+ P7 d _& l' Y) m4 ^+ L( r+ m8 UTr:=Ti*dt% Z- O/ W; J* R) d6 q) ]0 P
if Tr>ta
2 ~/ }" @. Y S4 B, Gthen
/ F2 a3 [* p( e/ U' Wif Tr>tb+L/c0 @9 W' q$ {5 J- b
then. p! ]/ ~, _% ^: V/ K% x$ A* `
Ui:=U0(x,Tr)*(f(x,Tr)-f(x-L,Tr-L/c))- s) b; T1 `- }# z$ m0 D
else
( l2 r/ r0 a* M" c0 Q: OUi:=U0(x,Tr)*(f(x,Tr)+1)" g8 u7 R* o3 s* v4 B, e8 ^- B
end if
7 m' _' {; h7 `& `else
! c7 ?4 H4 h# f( O! q/ VUi:=09 @+ T, x5 ^+ t( i% c
end if
* b9 m& `& B2 g' N! T5 Jif Tj=1 then
. `* S% R6 l$ N2 W: o7 aUindA[Ti]:=Ui else, e% f- Y1 J; c" L% w
UindB[Ti]:=Ui
; p! d& `, Q6 I$ lendif* H. \0 Q( G; n D* _
END FOR
& v- }3 W8 j5 u4 r1 I% _0 }END FOR
$ M3 p& C5 q9 i7 kFOR Ti:=0 TO Tmax DO
( o% n2 K; e3 pTr:=Ti*dt
3 T4 v, ?% P2 E: B: U: c6 hIF (Ti=0) THEN dI[0]:=00 T1 I3 k8 i! H3 o: b* w
ELSE
' {5 h' _5 C0 a! Ve:=exp(-(T1/T2)*exp(ln(m*T2/T1)/m))
$ R5 m; k$ E- e6 L7 T+ x9 NI:=Im/e*exp(m*ln(Tr/T1))/(exp(m*ln(Tr/T1))+1)*exp(-Tr/T2)
. p" j1 V7 K. N/ {& Q6 c6 idI[Ti]:=I*((m/Tr)/(exp(m*ln(Tr/T1))+1)-1/T2)0 ~- q/ K: @2 }0 o
END IF+ _$ I$ v7 [' j2 n4 D% W, d- N) A
END FOR1 B% O% g. t2 F/ B
Ti:=Tmax
- w9 X& P: W9 S: N+ O" dWHILE Ti>1 DO
$ a* e3 {! E8 y nFOR Tr:=1 TO Ti-1 DO
3 }8 v- Q5 Y, t/ N; ]8 @UindA[Ti]:=UindA[Ti]+UindA[Tr]*dI[Ti-Tr]*dt
" W x, ]4 [0 g$ ]UindB[Ti]:=UindB[Ti]+
+ g7 D H: h' }6 Y( S/ M8 BUindB[Tr]*dI[Ti-Tr]*dt' T# Z! h+ l4 I g/ t# ~( k
ENDFOR K/ \$ {3 _% y1 o" L
Ti:=Ti-1
+ E( d$ M, ]0 P6 m6 XEND WHILE
4 x, Z5 J$ h! E0 f1 X
' t$ K7 o8 J5 `Tr:=L/c
! w) S) n, j) q; N5 O# YEND INIT
( e8 o/ }9 ^2 Y, S# w& I! ^( _EXEC
K3 X0 {8 M8 k' k5 FUrAP:=UindA[t/dt]+2*delay(UBP,Tr-dt,1)-delay(UrBP,Tr,1)
" ~/ I- M8 D2 a7 r+ z3 w4 N9 yUrAN:=UindA[t/dt]+2*delay(UBN,Tr-dt,1)-delay(UrBN,Tr,1); W$ U; I. y" l& i4 k Z
UrBP:=UindB[t/dt]+2*delay(UAP,Tr-dt,1)-delay(UrAP,Tr,1)
+ o5 ^$ L3 Z+ B' }$ MUrBN:=UindB[t/dt]+2*delay(UAN,Tr-dt,1)-delay(UrAN,Tr,1)
: F6 b! Y; L8 O# \5 q! REND EXEC
- j' E+ m$ i% G9 A2 LEND MODEL/ ^" J# u7 L8 |/ z
. h, Z5 m) X( ?! \
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