Membrane Tensegrity

Hi,

I`m working on tensegrity structures where as tensile members I`m using membranes (mesh). After few successful tests I have problem with quite simple one, but can`t find a reason why members which should stay in place (anchor points) are shoot up "to the sky" ?

Any ideas?

Attachments:

membrane tensegrity_GH3D.3dm, 146 KB
membrane tensegrity_GH3D.gh, 168 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on July 26, 2012 at 5:57pm

Interesting model!

The problem is caused by the fact that the structure starts out below the ground plane, and you have 'Floor' switched on in settings

So when simulation starts, those points below Z=0 are getting suddenly projected back up to ground height, causing it to become unstable.

I would suggest just moving the whole model upwards, and/or reducing the timestep further

Permalink Reply by RadekS on July 29, 2012 at 8:32am

Daniel,

Thanks, it seems to be fine now (sometimes the easiest solutions are the most "hidden").

Could you please recommend me some soft (or maybe you know about some script) to unfold double curved surfaces?

Thanks in advance.

Best,

Permalink Reply by C Gonis on November 30, 2018 at 5:10pm

Hi!
I'm also trying a similar model, but with radial struts, based on a star pattern. I seem to be having issues getting my simulation to do anything other than freak out to infinity and then do nothing. I think it may be because I have used spherical meshes?
I would really appreciate any help :) THANK YOU

Attachments:

attempt at membrane tensegrity.3dm, 503 KB
attempt at membrane tensegrity.gh, 141 KB

Permalink Reply by Vladimir on August 20, 2012 at 7:50am

Hi, wercyngetoryks!

How did you make this mash?

Permalink Reply by RadekS on September 12, 2012 at 2:20pm

Hi Vlado,

I`m simulationg initial shape in Kangaroo in order to stretch "memnrane" to maxiumum in-between the members. When everything will work correctly I will post the model and definitions.

Best,

Permalink Reply by RadekS on September 12, 2012 at 3:24pm

Permalink Reply by behnaz on October 6, 2012 at 5:55pm

Hi,

I also want to ask how you made your initial mesh in rhino ? the mesh that you start before kangaroo is run?

behnaz

Permalink Reply by iris cheung on May 13, 2019 at 10:28pm

Do u mind to share yr working model? Cause I have been working on this membrane tensegrity structure now for assignment, Thanks a lot !

Permalink Reply by Zifeng Wei on March 16, 2013 at 1:20pm

Hi eR, amazing stuff first of all! I'm quite new to kangaroo and now working on a membrane tensegrity project. For some reason cannot get your 3dm file to load properly, got Rhino 4 SR9. Is it a version problem or do you have any new definitions?

Thanks in advance!

Best,

Zifeng

RSS