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## Robot Structural Analysis

Contributor
Posts: 11
Registered: ‎02-17-2012

# Unidirectional release

360 Views, 5 Replies
02-20-2012 04:13 AM

Hello,

what I'd like to know is:

does "Released direction" mean that there is no restraint in that direction?

For example, does released direction Ux+ mean "no restraint in Ux+"?

In the attached sketch you can see my doubt.

Thank you.

Product Support
Posts: 5,604
Registered: ‎04-26-2010

# Re: Unidirectional release

Take a look at this help topic:

http://docs.autodesk.com/RSA/2012/ENU/filesROBOT/GUID-A65C66FB-20DA-4B7C-BFE2-3A7B0CF54F7-249.htm

UX+\- shows different direction depending on bar start \ end

Rafal Gaweda
Contributor
Posts: 11
Registered: ‎02-17-2012

# Re: Unidirectional release

Oh, yes! ... But I think that it is exactly the opposite!

Product Support
Posts: 5,604
Registered: ‎04-26-2010

# Re: Unidirectional release

Take a look below, no compression (yellow diagram , Fx force) on right hand side beam due to release Ux+ defined at the beginning of this bar, tension in left bar

Rafal Gaweda
Contributor
Posts: 11
Registered: ‎02-17-2012

# Re: Unidirectional release

02-24-2012 12:52 AM in reply to: Rafal.Gaweda

I think the problem is solved:
let's take a look to the central node; the situation should be

this means that the 1st node of the 2nd bar is free in Ux+, while the whole bar is free in Ux-.
Due to the fact that there is a DSC element (is it correct?), the node and the bar move in opposite directions.
So the "beginning node of the bar element" (User's guide) is the node 1 of my sketch, while I intended that it was the "new node" of my sketch (they can move in opposite directions).

Giorgio

Product Support
Posts: 5,604
Registered: ‎04-26-2010

# Re: Unidirectional release

DSC algorithm creates connections between phisical node (on your screen capture node 1, on mine (below) node 2) and calculation node (on your screen capture "new node", on mine  - node 10).

In our situation (unidirectional realease UX+) such link does not exist between these two nodes only in UX+ direction so node 1 (or 2 on my example) can be displaced but your "new node" (mine node 10) remains in the same position.

In case of opposite direction force these nodes will act toghether:

Rafal Gaweda