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Strange results with Modal analysis/MES

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Message 1 of 21
n1210933
1230 Views, 20 Replies

Strange results with Modal analysis/MES

Hi,

I'm looking to use Algor to model a wind turbine blade being fatigue tested. As part of this process I am benchmarking it against some other software I have available, namely ADAMS, Ansys, and Inventor simulation.

I am doing this by using MES, but I have tried to benchmark by using modal analysis as well. The benchmark model is just an aluminium beam, cantilevered and allowed to fall under gravity so that it vibrates in its first mode. Neither the modal analysis, or the MES with brick (even at very fine mesh size) or beam elements predict the behaviour. The other software packages all agree very closely that the natural frequency is 25Hz in the direction with the high stiffness and 14Hz in the direction with the lower stiffness, but Algor is way out. I followed the piston MES tutorial but it seems I am definitely doing something wrong somewhere... I don't want to discount highly regarded software because I'm not doing something right!

Thanks,

Pete
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Message 21 of 21
S.LI
in reply to: John_Holtz

what I did is only "undo zoom", I didn't re-run your model.

here is what I see in my result for displacement Z at node 10. 

 

95iBB7EAC8EBC6D93A6

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