topic Help on dynamic simulation coupling between axes in Inventor Forum

Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 19:51:26 GMT

Hi everyone. I am but a beginner in Inventor. And I really don't know what to do next...

Clarifying,

I wish to run a dynamic simulation between a coupling.

the driving machine (the yellow one) is connected to the driven(the red one) by a coupling. It is basically a pair of disks with cylindrical bodies made of rubber attached to them that are pressed together to form the coupling

So I made the rubbers and the couplings each and then I assembled and constrained them. I did later a new assembly to create the coupling between both of them and I also constrained them:

I would like now to create a dynamic simulation to see the stress developed on the rubbers, however this is where I really don't know how to proceed..

Should I put a 3d contact type of joint? and If so, is there any way to select the rubbers' faces and the couplings' holes
Do I need to add more elements, perhaps to tell inventor which parts or elements are fixed or grounded?
Later on, I want also to do the dynamic simulation and introduce a variation in both axes so they are misaligned. Is this also possible?

I am attaching the assembly as well

and please tell me if you guys understand me, english is not my main language but hopefully I can explain anything that is not clear.

Re: Help on dynamic simulation coupling between axes

JDMather — Mon, 09 May 2016 19:59:56 GMT

@Anonymous wrote:

I am attaching the assembly as well.

...and please tell me if you guys understand me, english is not my main language but hopefully I can explain anything that is not clear.

Your english is very good.

An assembly file (*.iam) is only a list of instructions on how to put the part files (*.ipt) together.

Without the part files, the instructions are useless.

You must also attach the part files (*.ipt) here.

Put all of the assembly and part files into one folder.

Right click on the folder and select Send to Compressed (zipped) Folder.

Attach the resulting *.zip file here.

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 20:11:20 GMT

I see!

ok, attaching three elements,

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 20:12:13 GMT

and the remaining elements,

Re: Help on dynamic simulation coupling between axes

swalton — Mon, 09 May 2016 20:16:31 GMT

As I understand it, Dynamic Simulation is limited to rigid body motion. It will not deform any component under load. Think of it as a very nice Free-Body-Diagram solver.

It is possible to take loads generated by Dynamic Simulation into the Inventor Professional FEA solver. However that FEA solver is limited to linear isotropic materials with small displacements. Rubber is not a linear isotropic material, so your results will be pretty pictures, not useful data.

Nastran-InCAD or Simulation Mechanical, both FEA tools from Autodesk, might better fit your problem.

Also, Inventor iam files are useless without all the subcomponent files (all ipts and iams in the model browser). Use pack-n-go to create a .zip file for upload.

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 20:17:59 GMT

Sorry, I went ahead and didn't read all your instructions. Here is the zip file with all the ipt and assemblies

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 22:02:55 GMT

I am downloading the simulation mechanical... I guess my problem was not as easy as I thought it would be.

Thanks for the support and I will work on this and see what I can do

Re: Help on dynamic simulation coupling between axes

JDMather — Mon, 09 May 2016 22:17:20 GMT

Your parts are not assembled correctly for Dynamic Simulation - they are floating around in space.

The shaft should have only 1 degree of freedom - Rotation.

You will probably not want them in sub-assemblies either (just one master assembly).

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 22:27:01 GMT

as I was telling before, I am a novice in inventor.

Your parts are not assembled correctly for Dynamic Simulation - they floating around in space.

I guess that I need at least an element grounded?

The shaft should have only 1 degree of freedom - Rotation.

that means adding more constrains, right?

You will probably not want them in sub-assemblies either (just one master assembly).

that can be fixed but the real question is why? what is the difference between one master assembly and a combination of sub assemblies?

Re: Help on dynamic simulation coupling between axes

JDMather — Mon, 09 May 2016 22:29:40 GMT

@Anonymous wrote:

... but the real question is why? what is the difference between one master assembly and a combination of sub assemblies?

What book are you using to learn Dynamic Simulation?

Is your instructor trained in Dynamic Simulation?

Do you have about 6 months to fully investigate this question?

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 22:41:15 GMT

I am trying to learn from posts, you tube and whatever else I can find on the internet.

I was reading a really nice book "learning autodesk inventor 2014" they do cover at some degree the dynamic simulation. Do you have any other book suggestions?

I don't have an instructor.

Does it really take 6 months to understand why is not the same?

Re: Help on dynamic simulation coupling between axes

JDMather — Mon, 09 May 2016 22:44:32 GMT

@Anonymous wrote:

....

Does it really take 6 months to understand why is not the same?

I meant to learn the topic of Dynamic Simulation.

This is an advanced topic.

Re: Help on dynamic simulation coupling between axes

Anonymous — Mon, 09 May 2016 22:51:28 GMT

yes of course!

I don't want to remain always a novice in Inventor, I really would like to take advantage of all its power

Do you have any recommendations?