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SUBROUTINE SUBPB (I,L,LS,J,SGR,CGR,YREC,ZREC,SUM,XIC,DELX,EE,XLAM,
1 SG,CG,YS,ZS,NAS,NASB,AVR,ZB,YB,ARB,XLE,XTE,X,NB)
C
C COMPUTES ELEMENTS OF THE SUBMATRICES DPP, DPZ AND DPY
C USING SUBROUTINES SNPDF, INCRO AND SUBI
C
REAL KR,M
COMPLEX DPUR,DPUL,DPLR,DPLL,DP,SUM
DIMENSION XIC(1),DELX(1),EE(1),XLAM(1),SG(1),CG(1),YS(1),
1 ZS(1),NAS(1),NASB(1),AVR(1),ZB(1),YB(1),ARB(1),
2 XLE(1),XTE(1),X(1)
COMMON /AMGMN/ MCB(7),NROW,ND,NE,REFC,FMACH,KR
C
EPS = 0.00001
M = FMACH
BETA = SQRT(1.0-M*M)
FL = REFC
FLND = FLOAT(ND)
FLNE = FLOAT(NE)
SGS = SG(LS)
CGS = CG(LS)
DPUR = (0.0,0.0)
DPUL = (0.0,0.0)
DPLR = (0.0,0.0)
DPLL = (0.0,0.0)
DIJ = 0.0
DELR = 0.0
DELI = 0.0
DIJI = 0.0
DELRI= 0.0
DELII= 0.0
INFL = 0
IOUTFL = 0
C
C UPPER RIGHT SENDING POINT
C
IGO = 1
TL = XLAM(J)
SQTL = SQRT(1.0+TL**2)
SL = TL/SQTL
CL = 1.0/SQTL
X0 = X(I) - XIC(J)
Y0 = YREC - YS(LS)
Z0 = ZREC - ZS(LS)
ES = EE(LS)
DXS = DELX(J)
AX = X0
AY = Y0
AZ = Z0
CV = DXS
C
30 NOBI = 1
NA2 = 0
CALL SNPDF (SL,CL,TL,SGS,CGS,SGR,CGR,X0,Y0,Z0,ES,DIJ,BETA,CV)
IF (KR .LE. EPS) GO TO 40
SDELX = DXS
DELY = 2.0*ES
AX1 = AX + ES*TL
AY1 = AY + ES*CGS
AZ1 = AZ + ES*SGS
AX2 = AX - ES*TL
AY2 = AY - ES*CGS
AZ2 = AZ - ES*SGS
CALL INCRO (AX,AY,AZ,AX1,AY1,AZ1,AX2,AY2,AZ2,SGR,CGR,SGS,CGS,
1 KR,FL,BETA,SDELX,DELY,DELR,DELI)
40 IF (NB .EQ. 0) GO TO 120
NOAS = NAS(L)
C
C CHECK FOR ASSOCIATED BODIES
C
IF (NOAS .EQ. 0) GO TO 120
DIJS = DIJ
DELRS = DELR
DELIS = DELI
DIJI = 0.0
DELRI = 0.0
DELII = 0.0
NA1 = NA2 + 1
NA2 = NA2 + NOAS
IF (NA2 .GT. NB) NA2 = NB
C
C START DO-LOOP FOR THE SUMMATION OF THE WING-IMAGE CONTRIBUTIONS
C OVER RANGE(P)
C
DO 110 NA = NA1,NA2
NOB = NASB(NA)
C
C NOB IS THE SEQUENCE NUMBER OF THE CURRENT BODY ASSOCIATED WITH
C PANEL L IN WHICH THE SENDING POINT J LIES
C
NOBI = NOB
DA = AVR(NOB)
DAR = ARB(NOB)
DXLE = XLE(NOB)
DXTE = XTE(NOB)
GO TO (50,60,70,80), IGO
50 CONTINUE
DZB = ZB(NOB)
DYB = YB(NOB)
DETA = YS(LS)
DZETA= ZS(LS)
GO TO 90
60 CONTINUE
DZB = ZB(NOB)
DYB =-YB(NOB)
DETA =-YS(LS)
DZETA= ZS(LS)
GO TO 90
70 CONTINUE
DZB =-ZB(NOB)
DYB = YB(NOB)
DETA = YS(LS)
DZETA=-ZS(LS)
GO TO 90
80 CONTINUE
DZB =-ZB(NOB)
DYB =-YB(NOB)
DETA =-YS(LS)
DZETA=-ZS(LS)
90 CONTINUE
DCGAM= CGS
DSGAM= SGS
DEE = ES
DXI = XIC(J)
IF (DXI.LT.DXLE .OR. DXI.GT.DXTE) GO TO 110
CALL SUBI (DA,DZB,DYB,DAR,DETA,DZETA,DCGAM,DSGAM,DEE,DXI,TL,DETAI,
1 DZETAI,DCGAMI,DSGAMI,DEEI,DTLAMI,DMUY,DMUZ,INFL,IOUTFL)
DIJ = 0.0
IF (INFL.NE.0 .OR. IOUTFL.EQ.0) GO TO 100
DTL = DTLAMI
DSQRTL = SQRT(1.0+DTL**2)
DSL = DTL/DSQRTL
DCL = 1.0/DSQRTL
X0I = X0
Y0I = YREC - DETAI
Z0I = ZREC - DZETAI
CALL SNPDF (DSL,DCL,DTL,DSGAMI,DCGAMI,SGR,CGR,X0I,Y0I,Z0I,DEEI,
1 DIJ,BETA,CV)
DIJI = DIJI + DIJ
IF (KR .LE. EPS) GO TO 100
DELR = 0.0
DELI = 0.0
AYI = Y0I
AZI = Z0I
AY1I = AYI - DEEI*DCGAMI
AZ1I = AZI - DEEI*DSGAMI
AY2I = AYI + DEEI*DCGAMI
AZ2I = AZI + DEEI*DSGAMI
DEEI2 = 2.0*DEEI
CALL INCRO (AX,AYI,AZI,AX1,AY1I,AZ1I,AX2,AY2I,AZ2I,SGR,CGR,DSGAMI,
1 DCGAMI,KR,FL,BETA,SDELX,DEEI2,DELR,DELI)
DELRI = DELRI + DELR
DELII = DELII + DELI
GO TO 110
100 CONTINUE
DELRI = 0.0
DELII = 0.0
110 CONTINUE
DIJ = DIJS
DELR = DELRS
DELI = DELIS
120 CONTINUE
DP = CMPLX(((DIJ+DIJI)-(DELR+DELRI)),(-DELI-DELII))
GO TO (140,150,170,180), IGO
140 CONTINUE
DPUR = DP
IF (ND .EQ. 0) GO TO 160
C
C UPPER LEFT SENDING POINT
C
IGO = 2
SGS =-SGS
TL =-TL
SL =-SL
Y0 = YREC + YS(LS)
AY = Y0
GO TO 30
150 CONTINUE
DPUL = DP
160 CONTINUE
IF (NE .EQ. 0) GO TO 190
C
C LOWER RIGHT SENDING POINT
C
IGO = 3
TL = XLAM(J)
SL = TL/(SQRT(1.0+TL*TL))
Y0 = YREC - YS(LS)
Z0 = ZREC + ZS(LS)
AY = Y0
AZ = Z0
SGS =-SG(LS)
GO TO 30
170 CONTINUE
DPLR = DP
IF (ND .EQ. 0) GO TO 190
C
C LOWER LEFT SENDING POINT
C
IGO = 4
SGS = SG(LS)
TL =-XLAM(J)
SL = TL/(SQRT(1.0+TL*TL))
Y0 = YREC + YS(LS)
AY = Y0
GO TO 30
180 CONTINUE
DPLL = DP
190 CONTINUE
SUM = DPUR + FLND*DPUL + FLNE*DPLR + FLND*FLNE*DPLL
RETURN
END
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