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Learning GeoStar

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frankjconway

frankjconway

Mechanical
Jun 8, 2006
10
I've been using CosmosWorks for a little bit now and am getting cautiously familiar with it. I need to do some dynamic response problems which CosmosWorks will not do. We have the GeoStar add-on by CosmosM that should handle (via ASTAR) the dynamic response due to random vibration. I'm one who learns by doing, not reading. While CosmosWorks lends itself well to hopping and and trying things, GeoStar gives you hundreds of pages of documentation that I'm having trouble sorting through.

Does anyone know any source of info that will help you get started and just try a couple of analyses to get the hang of the user's interface?

Thanks in advance.
 
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Hi Frank,
You probably need to read the astar.pdf to get some backgtound on the specific command prompts for the curves and the type of study. I do mostly frequency response to harmonic input loading and the result I usually am interested in is the transfer function of a certain output node.

Here is a snippet to get started. Remember, you must run the modal analysis in geostar prior to running the dynamics solver, since it just integrates the mass normalized eigenvectors from the modal into displacement.


PD_ATYPE,5,5,1,20,280,20,1,2

c*The PD_DAMPREAD command activates the calculation of damping ratios based on specified Composite Material
c*Damping using the DAMP material property. The command, when issued, overrides information specified by the PD_MDAMP command.

PD_DAMPREAD


c*PD_CURDEF, curve label,starting time, ending time, amplitude of sine function,
c*freq, of sine function, phase angle of sine function,amplitude of cosine function,
c*freq of cosine function, phase angle of cosine function,constant of exponential function



ACTSET,TC,1
PD_CURTYP,1,1,0
PD_CURDEF,1,1,1,20,280,1,,,,,,,,,,,,,,,,

c*239837 coil,,,,,,
c*244932 coil,,,,,,
c*250320 coil,,,,,,
c*247205 coil,,,,,,
c*281768 sleeve,,,,,,
c*293743 sleeve,,,,,,
c*306521 sleeve,,,,,,
c*318412 sleeve,,,,,,


FNDel,239837,fy,239837,1,,
FNDel,244932,fy,244932,1,,
FNDel,250320,fy,250320,1,,
FNDel,247205,fy,247205,1,,

FND,239837,Fy,1,239837,1,0
FND,244932,Fy,1,244932,1,0
FND,250320,Fy,1,250320,1,0
FND,247205,Fy,1,247205,1,0


PD_NRESP,1,244932,,,,
PD_NRESP,1,250320,,,,
PD_NRESP,1,247205,,,,
PD_NRESP,1,281768,,,,
PD_NRESP,1,293743,,,,
PD_NRESP,1,306521,,,,
PD_NRESP,1,318412,,,,


PD_PLOT,1,30,1,0,,

R_DYNAMIC

ACTXYPOST,1,freq,UX,250320,0,1,1,1,250320N
ACTXYPOST,2,freq,Uz,250320,0,4,1,1,250320N
ACTXYPOST,3,freq,UX,247205,0,14,1,1,247205N
ACTXYPOST,4,freq,Uz,247205,0,16,1,1,247205N

c* below are plot requests for the other nodes
c*ACTXYPOST,2,freq,UX,247205,0,14,1,1,247205N
c*ACTXYPOST,3,freq,UX,281768,0,9,1,1,281768N
c*ACTXYPOST,4,freq,UX,293743,0,10,1,1,293743N
c*ACTXYPOST,5,freq,UX,306521,0,11,1,1,306521N
c*ACTXYPOST,6,freq,UX,318412,0,12,1,1,318412N


SETXYPLOT,0,0,10,3,1,1,1,2,8,2,1,1,0,0,14
XYPLOT,1
 
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