flexible dynamic 1

[yabande]

I am simulating a wheel in workbench in flexible dynamic analysis, I applyed a rotational velocity to the wheel axis, But the wheel is not moving forward!!!
Is there other set up I must do to make the wheel going forward?

Thanks

 

[cbrn]

Moving forward? How is your whole model / analysis set up?

 

[yabande]

there is a ground which wheel can moving on it. the connection between wheel and ground is "Rough".
In flexible dynamic set up, there are standard earth gravity, rotational velocity and fixed support( for the bottom face of ground).
in solution, i want to find out what is the reaction force between ground and wheel.
but after simulation I can not see any wheel movement in the animation.
Many thanks for your help

 

[Drej]

1) How are you applying the velocity?
2) What type of analysis is this? ANTYPE,TRANS?

Remember that you can't apply a rotational velocity directly to the model, not in a transient dynamic analysis which I assume you are undertaking (ANTYPE,TRANS).

Instead, if this is the case, you will need to apply a rotational displacement with respect to time.


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[yabande]

Thanks alot Drej for your very helpful advice.

It worked for rigid wheel at the hard ground perfectly.
but for flexible wheel (which has deformation) gave me this error massage"The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information"

I checked the help and
changed:
mesh>>>>>>>> "mechanical fine" or also "Explicit Fine"
analysis settings>>> "weak springs" and "large deformation" on
Connection>>>>>>Rough with "Asymmetric" Behavior

But I still got the same error!

Does any body have a thought or suggestion?
many thanks.

 

[pitizone]

hi,

I'm working too on a contact's problem. When the analysis don't converge, you can modify the stiffness of the contact (in the differents options of the contact)

good luck

 

[Drej]

For deformable contact, you will need an initial step to establish the initial contact of the wheel on the ground. This step will need to be carried out to make sure you get stabilised contact before you start turning the wheel.

Check also the status of your contacts with:

CNCHECK, Option, RID1, RID2, RINC

this will give you detailed feedback on what ANSYS is seeing.


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[yabande]

I am working on workbench ,,,where can I find CNCHECK and RID?

should I use "Rough connection" for initial contact as well?
or must be another connection option?

 

[yabande]

I found that,,,,CNCHECK ....is initial information in contact tool?

if it is:

rough wheel-ground... contact side>>>>" contact" and status>>>closed


rough wheel-ground.....contact side "target" and status>>>Inactive.



I have done simulations for "frictional" as well.
with the same initial information in contact tool.

I got error and no deformation on wheel outer ring!! with both setting.

I could not find out what the problem is(