February 24, 2016 at 00:11 #38154
I’m facing a problem with the stability of my “system” (see the picture)
The “system” is composed by two retangular vessels (10x20x3m) that are carrying a metallic structure (60×7.5×7.5m). They will be used to transport the structure to the construction point.
I assumed there’s no relevant pitch movement and the main problem is the roll movement.
Assuming the software gives the righting arm based on the roll movement, why when I increased the transversal length (from 20 to 30 m) the stability presents worse results and when I decreased the transversal length (from 20 to 10 m) presents better results (bigger righting arm)?Attachments:
February 24, 2016 at 11:58 #38155MaartenKeymaster
Can you share your model so we can have a look?
February 28, 2016 at 00:53 #38158
It doesn´t make much sense what you are saying?, can you share an image showing the coordinates system?
If you share the file I will run some calculations, and give you my thougths about it
March 22, 2016 at 21:56 #38202
March 24, 2016 at 04:05 #38204
Can you send it in 6.35 versión please, I can´t open newer versions….
March 24, 2016 at 20:18 #38205
I can’t save in an older version, i don’t have access to the pro version anymore. :dry:
thanks for the support!
March 24, 2016 at 22:43 #38206
March 26, 2016 at 00:05 #38214Sharat JamiParticipant
I hope this shall give you an idea about how the righting arm curve of a beamy hull and an narrow hull looks like
you can also see the comparision for different kind of hullforms
So in your case the hull is pontoon, i.e it has high initial stability, but it shall last for only upto 10 – 15 deg, after that there is a consistent, decrease in GZ value and it vanishes around 40-45 deg i.e you, so these kind of vessels will be best suited for coastal water operations.
the more wider you make the more stiff the vessel will become. so your max GZ value will increase at same lesser angle
I have simulated your case kindly refer the GZ curve comparisions i have found.
CASE-1: Width 30 m
CASE-2: Width 20 m
CASE-3: Width 10 m
I hope i must have clarified.
March 30, 2016 at 21:35 #38226
April 1, 2016 at 20:10 #38229
“jsharatchand” thank you for helping with your great report on this forum
“cruzmayora” for helping by e-mail (really, it helped a lot) :laugh:
thank you guys!!1 😛
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