Grasshopper

algorithmic modeling for Rhino

Analyse weaving structural performance

Hi all,

I am trying to feed different weaving pattern into Karamba to analyse their structural performance, but error message occurs :

1. Singular Stiffness-matrix: Can not solve static system.
Make sure that boundary conditions are set so that the structure can not move in rigid body modes.
When you analyze a flat shell structure lock the rotation perpendicular to the plate in at least one node.
Use the 'Eigen Modes'-component and activate the display of local coordinate axes: The first eigenmode will be the rigid body motion.

I have uploaded the definition below, hope anyone can help me with the solution.

Thanks, 
Wilson

Views: 490

Attachments:

Replies to This Discussion

Permalink Reply by Karamba3D on January 13, 2015 at 11:12am

Hi Wilson,

you forgot to add supports and loads to the structure. Without supports it is kinematic. There are 18 Eigenmodes with zero Eigenvalue (see attached definition). This corresponds to the sum of six degrees of freedom of each of the three unconnected parts your structure consists of. 

Best,

Clemens

Attachments:
Permalink Reply by wilson kwan on January 14, 2015 at 12:17pm

Hi Clemens!

Thanks for the explanation, manage to solve it in the end :))
appreciate it.


wilson

RSS

About

Scott Davidson created this Ning Network.

Translate

Search

Photos

  • Add Photos
  • View All

Videos

  • Add Videos
  • View All

© 2024   Created by Scott Davidson.   Powered by

Badges  |  Report an Issue  |  Terms of Service