how can I know if a part is completely constrained with fixtures in the Simulation or not?
for example: in Attach you finde one question in Solidworks simulation exam,is it fully constrain? and why?.
In 2016 there is a new feature in simulation called 'find underconstrained bodies'. This show if there are unconstrained DOF in your study.
In this case I would say that its fully constrained
Thank you Janko,
do you know how can I do it manually ?
If not properly constrained, the study will not run and give an error.
If it doesn't run: turn on 'Soft Springs' and look which part displaces very much (unrealisticly high). This part is probably not constrained properly. Constrain it the way it should be, turn off soft springs again, and run it again.
Other way is just to use common sense.
If the solid part (or assembly) is constrained in XYZ, then it is fully constrained. Sometimes you don't need to be 100% constrained if you use soft springs or inertial relief. In some cases, XYZ can over constrain the model and you will get erroneous results.
I can't remember where I read it but I've seen where some people with run a frequency or vibration test to see how the parts move together. If I find the document that discussed this I will attach a link.
That is true, if you run a natural frequency analysis it will show if parts are not constrained. This only works for an assembly and not a singular part.
I mean that, after I fixed the part, how can I know degrees of freedom??
Count the arrows. If you have 3 like this then the part is fully constrained.
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