DATCOM import not giving valid output for fields like dcdi_sym
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I was working on a project in MATLAB where I needed to import a DATCOM file but no matter what parameters I put, when I import it into MATLAB, the values stored for the control surface coefficients (like DCDI or clroll) are 99999 (NAN). Has anyone experienced anything similar/ has a solution to this?
The input code is as follows-
CASEID ----- MIKOYAN-GUREVICH MiG-17 -----
DIM FT
$FLTCON NMACH=5.0,MACH(1)=0.1,0.2,0.25,0.3,0.35$
$FLTCON
NALPHA=10.0,ALSCHD(1) =-4.0,-2.0,0.0,2.0, 4.0,6.0,8.0,10.0,12.0,14.0$
$FLTCON
NALT=5.0,
ALT(1)= 4500.0,4750.0,5000.0,5250.0,5500.0,
WT=13395.0,LOOP=1.0$
$SYNTHS XCG=11.17,ZCG=0.0,XW=3.63,ZW=0.42,ALIW=1.0,XH=28.73,
ZH=5.24,ALIH=0.0,XV=18.3,ZV=0.0,ZVF=1.0,VERTUP=.TRUE.$
$OPTINS SREF=243.0, CBARR=2.334, BLREF = 9.63$
$BODY NX=8.0,
X(1)=0.0,0.74,8.35,13.14,19.35,24.41,28.41,30.77,
S(1)=5.19,9.32,16.89,16.89,15.94,11.12,5.85,2.5$
NACA-W-6-66-012
$WGPLNF CHRDTP=7.02,SSPNOP=11.32,SSPNE=4.07,SSPN=15.71,
CHRDBP=8.4,CHRDR=14.0,SAVSI=45.0,SAVSO=45.0,CHSTAT=0.25,
TWISTA=0.0,DHDADI=-3.0,DHDADO=-3.0,TYPE=1.0$
NACA-H-6-66-009
$HTPLNF CHRDTP=1.86,SSPNE=5.42,SSPN=5.43,CHRDR=4.69,SAVSI=45.0,
CHSTAT=0.25,TYPE=1.0$
NACA-V-6-66-009
$VTPLNF CHRDTP=3.76,SSPNE=13.41,SSPN=8.18,CHRDR=12.47,SAVSI=55.0,
CHSTAT=0.25,TYPE=1.0$
$SYMFLP
FTYPE=1.0,
CHRDFI=1.407,
CHRDFO=1.407,
SPANFI=1.4,
SPANFO=5.1,
CB=0.12,
TC=0.14,
NTYPE=1.0,
PHETE = 3.03,
NDELTA=7.0,
DELTA(1)=-20.0,-10.0,-5.0,0.0,7.5,15.0,20.0
SCLD=-0.2,-0.1, -0.05,0.0, 0.06, 0.15,0.2
SCMD=-0.2,-0.1, -0.05,0.0, 0.06, 0.15,0.2$
$ASYFLP
STYPE = 4.0,
CHRDFI=2.23,
CHRDFO= 1.85,
SPANFI=9.42,
SPANFO=14.9,
NDELTA=9.0,
DELTAL=20.,15.,10.,5.,0.,-2.5,-5.,-10.,-15.,
DELTAR=20.,15.,10.,5.,0.,-2.5,-5.,-10.,-15.$
DAMP
BUILD
PLOT
NEXT CASE
11 Comments
Walter Roberson
22 minutes ago
Those coefficients do not appear to be set by that file ??
How do you make MATLAB import this file ? As far as I see, it's an input file for Digital DATCOM (Data Compendium), an USAF aerodynamic calculation software.
Kian
3 minutes ago
Walter Roberson
4 minutes ago
Kian
27 minutes ago
Does the import work for the output file of the tutorial example from DATCOM
?
If not, you should contact support:
CASEID ----- MIKOYAN-GUREVICH MiG-17 -----
$FLTCON NMACH=1.0,MACH(1)=0.6,NALPHA=10.0,ALSCHD(1)=-4.0,-2.0,
0.0,2.0,4.0,6.0,8.0,10.0,12.0,14.0,NALT=1.0,ALT(1)=5000.0,
WT=13395.0,LOOP=1.$
$SYNTHS XCG=11.17,ZCG=0.0,XW=3.63,ZW=0.42,ALIW=1.0,XH=28.73,
ZH=5.24,ALIH=0.0,XV=18.3,ZV=0.0$
$OPTINS SREF=243.0$
$BODY NX=8.0,
X(1)=0.0,0.74,8.35,13.14,19.35,24.41,28.41,30.77,
S(1)=5.19,9.32,16.89,16.89,15.94,11.12,5.85,2.5$
NACA-W-6-66-012
$WGPLNF CHRDTP=7.02,SSPNOP=11.32,SSPNE=13.41,SSPN=15.71,
CHRDBP=8.4,CHRDR=14.0,SAVSI=45.0,SAVSO=45.0,CHSTAT=0.25,
TWISTA=0.0,DHDADI=-3.0,DHDADO=-3.0,TYPE=1.0$
NACA-H-6-66-009
$HTPLNF CHRDTP=1.86,SSPNE=5.42,SSPN=5.43,CHRDR=4.69,SAVSI=45.0,
CHSTAT=0.25,TYPE=1.0$
NACA-V-6-66-009
$VTPLNF CHRDTP=3.76,SSPNE=6.05,SSPN=8.18,CHRDR=12.47,SAVSI=55.0,
CHSTAT=0.25,TYPE=1.0$
DIM FT
BUILD
PLOT
NEXT CASE
Kian
21 minutes ago
I can reproduce your problem.
Here is a similar problem described:
https://uk.mathworks.com/matlabcentral/answers/734807-datcomimport-returns-all-coefficients-as-99999
I'm not sure if the problem arises because of your case formulation or because of the data import to MATLAB.
s = datcomimport('output.txt')
s{1}
s{1}.dcdi_sym
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