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ufechner7 / Tethers.jl

Tether models
MIT License
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Tether_07.jl: oberservations #4

Closed johhell closed 1 month ago

johhell commented 9 months ago

I'm not sure, but I found some points are not clear for me:

calculation of tether cross-section

mass_per_meter = se.rho_tether * se.segments * (se.d_tether/2000.0)^2 correct: mass_per_meter = se.rho_tether * pi * (se.d_tether/2000.0)^2 # rho * cross-section

chain model

see commit: https://github.com/johhell/Tethers.jl/commit/e9a3c40fc14b6d0587683795730b25c1d8e57d7a

Some details: there are N segments with (N+1) nodes with masses. Therefore (N+1) forces are needed to calculate the acceleration. For the first and last node the formulas are different. For all other, segment-forces from spring/damper are added.

I checked the revised model with my Modia3D model and received the same results.

ufechner7 commented 9 months ago

Feel free to create a pull request!

ufechner7 commented 2 months ago

I fixed the calculation of mass_per_meter. Thanks for finding this bug!

ufechner7 commented 1 month ago

I tried to fix all issues. Still missing: A set of unit tests. I make a separate issue for that.