Sharat Jami
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Sharat JamiParticipant
Hello ICare,
Your Idea is nice where TCB becomes LCB & Vice versa, it will work,
DS is analysing only Longitudinal Stability in free version so you change Transverse stability to Longitudinal,…..also make sure you give frame of reference at amidships for a clearer understanding.
Sharat JamiParticipantOk Found it….The Algorithm is in MSC 216 82
Sharat JamiParticipantHey Brian,
I can share some booklets which i did, but if you need exactly for the specs mentioned above then a new one is to be prepared, I doubt nobody will do it for free…
Sharat JamiParticipantDear Jayoh,
It is possible to export DS to freeship by exporting as parts,
Or else you can purchase inclined hydrostatics extensions from DS, if you want to avoid hassles between two softwares.
Sharat JamiParticipantDear Sir,
I understood your discussion, the procedure elaborated by you is perfect, but the results you asking cannot be found on free version of Delftship, it can be found in much primitive version called Freeship (Absolutely free to use GPL)….
TCB can be seen in design hydrostatics…..
But VCG is not a hydrostatic property it depends on weight, you have to tediously compute each and every detail of material you are using…
I hope i have resolved….
Sharat JamiParticipantThanks Mr Jurgen for your opinoin,
However i was reading the IMO 55 SLF session, where IMO are considering to amend the part B of IS Code 2008, they are proposing to implement new regulations for towing, lifting and anchor handling operations in the Second generation stability code. It was initially proposed by the Norwegians, to which all the subcommittee members encouraged and subcommittee is most likely to be accepted.
Maybe in the coming year we will have this as Second Generation Intact Stability Criteria. a complete set of new regulations,
check out the proposed ammendmentsMSC9631AmendmentstotheintroductionandpartBoftheInternationalCodeonIntactStability2Secretariat.pdf
Sharat JamiParticipantHi Maarven,
I did not understand what exactly is another direction??
Sharat JamiParticipantI think its a classic mix up which everybody experiences for the first time when they execute stability on any software.
The major idea of stability depends on buoyant hull which is considered, if there are any openings on the hull, the stablity GZ curve stops at that particular angle where the point gets immersed.
I am showing a case study for better explanation which was executed in Freeship GPL software. which is primitive version of Delftship.
A Box of dimensions L=21 m,B=5.9 m,D=1.5 m is submerged for a draft T = 0.5 which corresponds to Disp = 63.499 T,
stability is assessed for 2 cases. for constant draft/disp.Case1: Deck Surface closed.
GZ curve comes as follows:
Case2: Deck Surface Open
‘
GZ curve comes as follows: you can actually see a sudden collapse in GZ, that is because at that angle the water starts flooding inside thus changing the displacement, hence here a much advanced concept of dynamic stability including ingress of water is applied to predict stability.
Normally when performing intact stability check the body which is floating needs to be completely enclosed, a complete enclosure can be checked by an option called check model in delft ship. if leak points are observed your hull is open to flooding.
I hope i have solved the issue.
Sharat JamiParticipantHello Ifuchs,
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 4045 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.
CASE1: Width 30 m
CASE2: Width 20 m
CASE3: Width 10 m
I hope i must have clarified.

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