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Robot Structural Analysis

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Valued Contributor
mgaafar
Posts: 69
Registered: ‎11-29-2011

Re: wrong load on panel

06-01-2012 10:10 AM in reply to: pp2008

Thanks for the clarification Pawel, but should the load be reversed when the Z-axis of the panel is reversed? even if it is not planer? or the program does not understand that?

Also how to make sure that the panel is planer or how to fix that or check that?

Thanks

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Product Support
Posts: 461
Registered: ‎06-23-2008

Re: wrong load on panel

06-04-2012 01:33 AM in reply to: mgaafar

After changing local Z of the panel the load will be reversed but for your original file the effect of opposite load direction with/without description will still be observed - because of no planarity of panel resulting in opposite Z for finite elements than for panel.

The sensitivity to such small planarity inaccuracies was reported to developement team to be analyzed and eliminated.

 

Planarity can be corrected:

1/ or correcting to plane from  Edit>Detailed correctdetail_correct.png

2/ or  extending the number of decimals and correcting coordinates of some points of contourcorrect.png

 

Regards,



Pawel Pulak
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Valued Contributor
mgaafar
Posts: 69
Registered: ‎11-29-2011

Re: wrong load on panel

06-04-2012 10:47 AM in reply to: pp2008

Thanks for the clarification Pawel!!

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Valued Mentor
tony.ridley
Posts: 636
Registered: ‎09-07-2011

Re: wrong load on panel

06-04-2012 06:55 PM in reply to: mgaafar
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Product Support
Posts: 461
Registered: ‎06-23-2008

Re: wrong load on panel

06-05-2012 01:15 AM in reply to: tony.ridley

Tony,

kudos for adding this info :smileyhappy:

Using "rounding add-in" of Rafal results in bigger "curving" of panel instead of "flattening" it but it helps too.

The effect noticed by mgaafar can be observed for some range of panel unplanarity.

 

Regards,



Pawel Pulak
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Valued Contributor
mgaafar
Posts: 69
Registered: ‎11-29-2011

Re: wrong load on panel

06-05-2012 08:00 AM in reply to: pp2008

Since almost no one works with warped panels, I think there should be an option that checks all panels if they are planer or not and then fix the warped ones automatically instead of checking and fixing panel by panel.

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Contributor
Posts: 19
Registered: ‎04-01-2009

Re: wrong load on panel

06-05-2012 12:04 PM in reply to: mgaafar

Hi Pawel,

 

consider that I had this problem (you can see the first post) more than one time and apparently in a random manner applying hydrostatic load on curved shell.......sometimes is not possible to flatten a cylindrical tank!!!!

 

Bye

Roberto

 

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Product Support
Posts: 461
Registered: ‎06-23-2008

Re: wrong load on panel

06-06-2012 01:45 AM in reply to: RobertoPALLADINO6546

Hi Roberto,

I agree that it should not be necessary to eliminate any planarity inaccuracies - especially that sometimes (slightly twisted roofs, intersections of cylinders, etc) they cannot be avoided.

As I have mentioned in my previous answer:

"The sensitivity to such small planarity inaccuracies was reported to developement team to be analyzed and eliminated."

 

Regards,



Pawel Pulak
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Contributor
Posts: 19
Registered: ‎04-01-2009

Re: wrong load on panel

06-06-2012 05:03 AM in reply to: mgaafar

Ok Pawel, many thanks.......we will wait for this correction

 

Bye

Roberto

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