End-Release in 1D beam element analysis
I am trying to perform a 1D beam element analysis on a FSAE car. I need help regarding the application of beam end releases at the suspension nodes, but at this point I don't know is whether I am doing this right
Node 1 i.e. pin a = 456, node 2 i.e. pin b =0 - for simulating the a arm with a ball joint
and,
Node 1 i.e. pin a = 5, node 2 i.e. pin b = 5 - for simulating the bell crank.
Thank you.
Answers
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Hi Gurtej, your degrees of freedom are reasonable for a ball joint and bell crank. The two things I would recommend are to:
1) Release degrees of freedom where the a arm meets the upright. This should match whatever mechanism you use.
2) Ensure the coordinate system is correctly defined for the beam. When using the bar panel, the 'orientation in basic' section is defining the 'Y' Axis. If you're releasing dof 5, this is the axis it will be released on.
Hope this helps!
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Hello Christian,
So after running the analysis, my max displacement(v) Mag is 1.648E+02 which I think is a little too much, I know there is something wrong in my setup but I cant figure it out, I am new to HyperWorks if its not too much to ask is there a way I can share the file to you so that you can inspect?
Thank you.
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Sure, send it to the email in my bio and I can take a look.
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Christian Free_22016 said:
Sure, send it to the email in my bio and I can take a look.
I just emailed you the file please check.
Thank you.
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Have a look at the normal modes of the model and you'll see some of the members are a little less connected than you'd like in a chassis
Other than that, the model looks reasonable to me.0 -
Christian Free_22016 said:
Have a look at the normal modes of the model and you'll see some of the members are a little less connected than you'd like in a chassis
Other than that, the model looks reasonable to me.one last thing, and this might be a silly doubt but the max displacement (v) mag= 1.648E+02 is it read as 164.8mm?
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Gurtej Singh Channa said:
one last thing, and this might be a silly doubt but the max displacement (v) mag= 1.648E+02 is it read as 164.8mm?
Yes this is correct. It's worth also mentioning that OptiStruct is a unitless solver. I saw you used a DTI_units card, but this only for reference with OptiStruct. A consistent unit system must be used. If your length units are mm and force are newtons then your mass unit will be tons.
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Christian Free_22016 said:
Yes this is correct. It's worth also mentioning that OptiStruct is a unitless solver. I saw you used a DTI_units card, but this only for reference with OptiStruct. A consistent unit system must be used. If your length units are mm and force are newtons then your mass unit will be tons.
I truly appreciate all the insight you have provided till now.
Thank you,
-Gurtej Singh
Chassis Team
UTA Racing
1
Altair Employee