Autodesk Simulation Mechanical and Multiphysics

[#1]

I have a 2D gear model that I am trying to run in MES. I have a prescribed displacement equal to 1 tooth on the large gear so that I can examine the the displacements and stress through the 6.1 degrees of rotation. Based on  the rpm of the gear the time of the event would be about 0.0326 seconds. I get results that are obviously based on rotating the gears from 0 to 115 rpm during that time based on the inertia of the gears.

My question is: How do I exclude the inertia from the analysis? I can use a longer time period but does that have an effect on the contact stresses at  the teeth?

I have not used MES much so any help would be appreciated. Thanks

[#2]

Nice gears.

Most formulas for inertia include the mass, so setting the mass density to 0 could be one solution.

But MES often has problems if all of the parts have 0 mass. A better solution would be to give all of the parts an initial rotation (Setup > Loads > Initial Velocity). Naturally, you will need to provide two initial velocities because the center of rotation is different for the gear and pinion.

[#3 · Accepted solution]

Thanks for the help John. I will give it a try. I tried using zero density materials but the model would not run at all.

[#4]

The reason is that you are using "MES with Nonlinear Material Models" type, which need mass matrix in the equation.  So zero density is not allowed.

-Shoubing

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nosborne wrote:

Thanks for the help John. I will give it a try. I tried using zero density materials but the model would not run at all.

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