The mass and centre of gravity of the whole system are input for the intact stability calculation. For this tutorial a very simplified stability calculation is used. The only input value that is required is the moment of area inertia of the waterline area.
Intact stability calculation
.
Parameter name |
Dimension |
Determined by |
Reference |
In Class |
|
[m] |
USR: User or system/equation |
Distance between center of buoyancy and metacenter |
Intact stability calculation |
|
[m] |
USR: User or system/equation |
Metacentric height |
Intact stability calculation |
|
[m] |
USR: User or system/equation |
Distance between keel and center of buoyancy |
Intact stability calculation |
|
[m] |
USR: User or system/equation |
Distance between keel and center of gravity |
Intact stability calculation |
|
[m^4] |
USR: User or system/equation |
Moment of inertia of the water plane area, For this tutorial give a rough estimate |
Intact stability calculation |
Intact stability calculation
: Loa
,Boa
,BM
, COGX
, COGY
, COGZ
, Displacement
, GM
, KB
, KG
, Moment_of_Inertia
, Rho
, and T_design
.Loa = ENTITY#(xx).Loa
where “xx” is the QEntityID
value of entity Main Dimensions
.
Boa = ENTITY#(xx).Boa
where “xx” is the QEntityID
value of entity Main Dimensions
.
GM = KB + BM – KG
BM = Moment_of_Inertia / (Displacement/Rho)
KG = COGZ
KB = 0.7*T_design
T_design = ENTITY#(xx).T_design
where “xx” is the QEntityID
value of entity Hydrostatics
.
Displacement = ENTITY#(xx).Mass
where “xx” is the QEntityID
value of entity Mass calculation
.
COGX = ENTITY#(xx).COGX
where “xx” is the QEntityID
value of entity Mass calculation
.
COGY = ENTITY#(xx).COGY
where “xx” is the QEntityID
value of entity Mass calculation
.
COGZ = ENTITY#(xx).COGZ
where “xx” is the QEntityID
value of entity Mass calculation
.
Rho = ENTITY#(xx).Rho
where “xx” is the QEntityID
value of entity Hydrostatics
.
QEntityData
.