How to output force of a User Subroutine Bushing (difined by GFOSUB)?
Hello everyone,
I difined a Bushing with user subroutine GFOSUB in Python, the input is Bushing velocity and displacement and returns six-point force, like:
def GFOSUB(id, time, par, npar, dflag, iflag): … return [FX, FY, FZ, MX, MY, MZ]
The simulation performed correctly, but the output of Bushing force is zero. As shown in Figs below. Bushings in Fig. 1 are all general Bushings, the force in the middle is an external force
In Fig.2, GFOSUB Bushing on the left and general Bushing on the right. The GFOSUB Bushing force has vanishes, but force of another Bushing seems similar, means there is no error in the model setup.
The problem is I need the GFOSUB Bushing force for debugging, so how can I get it to output correctly?
Sincere gratitude，
Garand
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- Use a Force entity instead of Bushing with the same GFOSUB. and define an output on the Force. (Actually, when Bushing is made anything but Linear, it goes as a Force to the solver.)
- if you are very particular about using the Bushing entity, you may define the output <Post_Request statement in a Template
Hello Praful
Thank you for the reply.
Yes, I've tried this, but the result is all zero. Shows in figs. below:
Above belongs the GFOSUB Bushing. Just like in HyperView, the bushing force vanishes.
Does this means GFOSUB Bushing is not allowed to be output in MotionView?
Sincerely,
Garand
Altair EmployeeHello Garand - I think I found the problem. This could be a bug in MotionView where it is not writing the correct marker id for j_marker_id in the <Post_Request statement. (I am presuming you are using xml)
There are couple of workarounds you can use to get around this problem.
Hope this helps.
Praful
- Use a Force entity instead of Bushing with the same GFOSUB. and define an output on the Force. (Actually, when Bushing is made anything but Linear, it goes as a Force to the solver.)
- if you are very particular about using the Bushing entity, you may define the output <Post_Request statement in a Template
Altair EmployeeHello Garand - I think I found the problem. This could be a bug in MotionView where it is not writing the correct marker id for j_marker_id in the <Post_Request statement. (I am presuming you are using xml)
There are couple of workarounds you can use to get around this problem.
Hope this helps.
Praful
Hello Garand - Have you tried defining an Output of type Force using the Bushing ?
Regards
Praful