How to make same request as 907 using functions?

jozef.bucha over 4 years ago

Hello, I want to make request same as 907 (measuring displacement) but with functions:

My request using functions:

To obtain same translational displacement for F2 i had to add minus sign:

Problem is with angles. Yaw angle values are perfectly same:

Roll angles are not perfectly same:

Biggest difference is in pitch angle. To have same sign of values i have used minus in F7 function of request:,

Why are pitch angles so different? Is there some problem in my function request?

Also what I do not understand is why subrutine 907 for longitudinal displacement is giving positive values (i think vehicle is going in minus direction of GCS).

Thanks

Jozef

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0 Martin Kieltsch over 3 years ago

Without the source code of req907 that'll be difficult to say, but other codes I ran across use the fortran utility SYSARY with the option DISP to fill a result array and then return that to ADAMS.

The solver documentation states that SYSARY/DISP evaluates DX/DY/DY/PSI/THETA/PHI which is exactly what you tried.

But you also noticed that the results were negative.

So in your case I'd first try to invert i/j in the function expressions instead of negating the results.
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0 Martin Kieltsch over 3 years ago

Without the source code of req907 that'll be difficult to say, but other codes I ran across use the fortran utility SYSARY with the option DISP to fill a result array and then return that to ADAMS.

The solver documentation states that SYSARY/DISP evaluates DX/DY/DY/PSI/THETA/PHI which is exactly what you tried.

But you also noticed that the results were negative.

So in your case I'd first try to invert i/j in the function expressions instead of negating the results.
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