Soft tensile torsion net

Hi,

I'm trying to model a device I've made. https://youtu.be/Feiyg4zr_Mw

It transfers torsion from spinning kites along their tethers, which are arrangesd as a cylindrical network.

The important part to model is the basic unit of 1 cylinder level of rope ring network. I'm trying to show that the cylindrical ratio (Length/Radius) determines the workable amount of Tension/Torsion which can be transmitted over the basic unit of a basic net tube.

To do the modelling I have fixed the bottom points. segmented all lines and made them into springs. Lifted the net at the top points of the lines with unary force. Rotated the top of the line points with vortex. Expanded a mini top mesh with pressure force.

This video shows that the axis goes a bit wonky after settling.

https://youtu.be/CipWOcqeS4g

Attached is the .gh Can anyone suggest why it goes wobbly after just about settling?

A point down low seems to get caught up spinning off and affecting everything else.

Is there a duplicated point or something else going into kangaroo which I can't see?

Any help appreciated.

rod

Attachments:

cylinder twisting basics5.gh, 21 KB

Replies to This Discussion

Permalink Reply by roderick read on August 13, 2016 at 2:49am

I just needed to fix my axis as anchor points to stop the end of sim wobble.

Instead of using kangaroo forces, I originally tried to use a resultant vector which was related to the model ...but it wouldn't change as it rotated around the model.

Is there a way to have a vector which maintains relation to the model through rotation?

I suspect I will have to combine Hoopsnake (or another looping or Galapagos) with Kangaroo.

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