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Flexbody constraints

Josef K.
Hello,
 
I want to constrain a flexible body on multiple points, using rbe2 and fixed joints. When I use more than 1 joints I get a redundunt constraints message and the simulation stops due to lock errors. I tried removing some of the fixed joints, but then the flexible body just "pivoted" around the remaining last one.
 
Is there a more proper way to constrain flexible bodies on multible points?
 
Thanks,
 
Josef
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  • 0
    Hello,
     
    The model crashes on different simulation times, depending on which forces I leave active and which I deactivate. What strikes me the most is the fact that just activating gravity, with no other motions/forces, makes the model crash the fastest (at 10 seconds instead of 50-60 seconds of simulation time). When I animated the model it seemed as though gravity significantly deformed the model which is not possible as the model is quite light (I double checked the units as well) and I have also run a sol101 with gravity on a nastran model with no problems whatsoever.
     
    By running an Eigen mode analysis, do you mean to exctract a nastran model from adams and run sol 103 while on its deformed state or is there a way to run an eigenmode analysis inside adams?
     
    Thanks,
     
    Josef
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  • 0
    Hello,
     
    The model crashes on different simulation times, depending on which forces I leave active and which I deactivate. What strikes me the most is the fact that just activating gravity, with no other motions/forces, makes the model crash the fastest (at 10 seconds instead of 50-60 seconds of simulation time). When I animated the model it seemed as though gravity significantly deformed the model which is not possible as the model is quite light (I double checked the units as well) and I have also run a sol101 with gravity on a nastran model with no problems whatsoever.
     
    By running an Eigen mode analysis, do you mean to exctract a nastran model from adams and run sol 103 while on its deformed state or is there a way to run an eigenmode analysis inside adams?
     
    Thanks,
     
    Josef
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