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Autodesk Inventor Dynamic Simulation

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Message 1 of 8
pquenzi
3116 Views, 7 Replies

Autodesk Inventor Dynamic Simulation

I am new to Inventor 2014 Dynamic Simulation and would greatly appreciate more detailed information on making joints than can be found in the tutorials.  This is one fantastic tool and I would like to learn to use it.

I do have a specific question. I made a simple simulation of a freely falling cylinder with rounded nose falling onto a transverse fixed cylinder using a 2d contact joint. The simulation showed the falling cylinder make contact and bounce back as it should. The output grapher showed the forces generated at contact on each bounce. I did some fairly simple physics calculations to see if my calculated forces were in the same ballpart as the dynamic simulation forces and they were within reason. When I changed material on the falling cylinder from steel to rubber the contact forces dropped. However, when I changed material on the stationary cylinder from steel to rubber, the contact forces did not change. Can anyone tell me the procedure used in dynamic simulation to generate these contact forces. Thanks for the help. Phil

7 REPLIES 7
Message 2 of 8
JDMather
in reply to: pquenzi

Attach your assembly here.

 

Get the Wasim Younis Book 2 from Amazon.com

 

This was an interesting assembly posted yesterday

http://forums.autodesk.com/t5/Inventor-General/Dynamic-Simulation-Parameters/td-p/4702905

 


-----------------------------------------------------------------------------------------
Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional


The CADWhisperer YouTube Channel


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Message 3 of 8
LT.Rusty
in reply to: JDMather


@Anonymous wrote:

Attach your assembly here.

 

Get the Wasim Younis Book 2 from Amazon.com

 

This was an interesting assembly posted yesterday

http://forums.autodesk.com/t5/Inventor-General/Dynamic-Simulation-Parameters/td-p/4702905

 


 

 

100% concur.

 

Wasim Younis' book is the gold standard when it comes to dynamic simulation.  There's probably nobody on earth who isn't employed by Autodesk that knows more - and can teach more - about how to use Inventor's simulation products.

Rusty

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Message 4 of 8
pquenzi
in reply to: JDMather

Okay, I ordered it. Still would appreciate any explanation on this post if possible. Thanks. Phil
Message 5 of 8
JDMather
in reply to: pquenzi


@pquenzi wrote:
... Still would appreciate any explanation on this post if possible.
...

Attach your assembly here.


-----------------------------------------------------------------------------------------
Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional


The CADWhisperer YouTube Channel


EESignature

Message 6 of 8
pquenzi
in reply to: pquenzi

Here are the files.

Message 7 of 8
ravikmb5
in reply to: pquenzi

Changing the Material wont help

 

Change restitution co-efficient properties in 2d contact will help to some extent

 

The coefficient of restitution (COR) of two colliding objects is a positive real number between 0.0 and 1.0
representing the ratio of speeds after and before an impact, taken along the line of the impact. Pairs of objects
with COR = 1 collide elastically, while objects with COR < 1 collide inelastically.

 

 For a COR = 0, the objects effectively "stop" at the collision, not bouncing at all. An object (singular) is often described as having a coefficient of restitution as if it were an intrinsic property without reference to a second object, in this case the definition is assumed to be with respect to collisions with a perfectly rigid and elastic object. The Coefficient of Restitution is equal to the Relative Speed After Collision divided by the Relative Speed Before Collision

 

 

 

 

 

12-23-2013 10-31-41 PM.png

Please mark this response as Problem Solved if it answers your question.
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Ravi Kumar MB,
i7 860 Dell Studio XPS Win 7 64 bit 12 Gb RAM & HP Z220 SFF Workstation
Autodesk Inventor Certified professional 2016
Email: ravikmb5@gmail.com





Message 8 of 8
pquenzi
in reply to: pquenzi

Thank you. I did play with the coefficient of restitution a little and I see how it works. Your comment about the second body being assumed perfectly elastic is basically what I was interested in. As long as I know what the assumptions are I'm good for now. Phil

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