topic Betreff: Dynamic Simulation: placed part is grounded when it should be free to m in Inventor Forum

Dynamic Simulation: placed part is grounded when it should be free to move

bender.terry — Thu, 27 Sep 2018 23:58:06 GMT

I am placing SolidWorks generated parts into an assembly and providing mates, etc. Some parts I don't mate and instead wait to "Insert Joint" within the Dynamic Simulation environment. Anyway, these must move, but they come in under Grounded. See attached screen shot. How do I unground them, like moving to Mobile Groups, etc.? If I right click in Dynamic Sim, or the Assemble environment, Ground is not checked.

Re: Dynamic Simulation: placed part is grounded when it should be free to move

johnsonshiue — Wed, 26 Sep 2018 14:11:14 GMT

Hi! Could you share the files here? There should be a logical reason to explaining the behavior.

Many thanks!

Re: Dynamic Simulation: placed part is grounded when it should be free to move

TheCADWhisperer — Wed, 26 Sep 2018 15:08:26 GMT

For image to be of any use - you would need to expand to show the Constraints.

My guess would be right click Retain DoF.

Betreff: Dynamic Simulation: placed part is grounded when it should be free to m

j.palmeL29YX — Wed, 26 Sep 2018 16:42:57 GMT

@bender.terry schrieb:
How do I unground them,

Add any joint.
In the assembly environment all parts have 6 degrees of freedom and we can reduce some/all of it adding constraints.
In the Dynamic Simulation all parts are initially fixed and get their degrees of freedom by adding joints.

cadder

Betreff: Dynamic Simulation: placed part is grounded when it should be free to m

TheCADWhisperer — Wed, 26 Sep 2018 17:24:43 GMT

@j.palmeL29YX wrote:
Add any joint.

What if automatically converting assembly constraints to Dynamic Simulation Joints?

Re: Dynamic Simulation: placed part is grounded when it should be free to move

bender.terry — Wed, 26 Sep 2018 18:25:29 GMT

Find attached the SW part as brought into Inventor Pro. Query the part, etc.

I'm new to Inventor and can't find where I can assign DOFs or make un-Grounded in Dynamic Simulation.

Some parts I brought in were not made Grounded. Others, it seems, are Grounded by default like the attached sample. Sorry I can't provide assy; it's proprietary. I did nothing different from importing one part and another into the assy, just used Place as reference part or not.

All I need are steps to make any Grounded part un-Grounded so that the part will move under the influence of gravity, spring force, force, contact, or any combination of these.

When using 2018 a few months ago, I did not run into this problem. I took 2018 down when I installed 2019.

Terry

Betreff: Dynamic Simulation: placed part is grounded when it should be free to m

j.palmeL29YX — Wed, 26 Sep 2018 19:54:10 GMT

@TheCADWhisperer schrieb:
@j.palmeL29YX wrote:
Add any joint.

See the attached video https://autode.sk/2QZSpB8. It is a simple example which shows the principial behavior. I cannot open files which are newer than IV 2015 (so also not yours) , but I think this video shows what I meant. Of course you should add instead of the spatial joint a joint which is useful for you.

cadder

Re: Dynamic Simulation: placed part is grounded when it should be free to move

TheCADWhisperer — Wed, 26 Sep 2018 20:58:27 GMT

@bender.terry wrote:
Find attached the SW part ...

A SolidWorks part file has the extension *.slprt not *.iam

A SolidWorks assembly *.sldasm must include part files *.sldprt

An Inventor assembly *.iam must include part files *.ipt