Modelling loops

Cables become loops if they start and end with the same circle.

from DAVE import *

DAVEcore version = 2.0 from c:\python\miniconda3\envs\book\Lib\site-packages\DAVEcore.cp311-win_amd64.pyd
! Blender not found - Blender can be installed from the microsoft windows store.   if you have blender already and want to be able to use blender then please either:
   - configure windows to open .blend files with blender automatically 
   - add the folder containing blender-launcher.exe to the PATH variable.

s = Scene()
s.new_point('Point1', position = (0,0,-2))
s.new_circle('Circle1', parent = 'Point1', axis = (0,1,0), radius = 1)

s.new_point('Point2', position = (0,0,2))
s.new_circle('Circle2', parent = 'Point2', axis = (0,1,0), radius = 1)

s.new_cable("grommet", endA="Circle1", endB = "Circle1", sheaves = ["Circle2"], EA = 100)

grommet <Cable>

s.solve_statics()

True

We expect the length of the loop to be:

\( 2 \pi r + 2 * 4 = 14.28\)

grommet = s['grommet']

stretched_length = grommet.length + grommet.stretch

print(stretched_length)

14.283185307179586

from DAVE.jupyter import show
show(s, zoom_fit=True, width=2000, height=2000)