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英语翻译
7.1.3 Things to watch for:
The method described above will work without any complications for simple tanks
and compartments.However,there are two possible problems,which will occur if
any of them are linked or are defined with boundary surfaces.
7.1.3.1 Linked Tanks:
If you have linked tanks,before copying data in MS Excel,you should un-link them
by simply filling down the parent's Type into the Type of the linked tanks below it:
Select cells,then right-click to bring up the context menu and select Fill Down:
The Compartment definition window should now look like this:
Now you can proceed as before using MS Excel to sort the tanks into the desired
order.After you have pasted the sorted compartment data back into Hydromax,you
will need to re-link the tanks by typing Link or L into the relevant Type rows.
7.1.3.2 Boundary Surfaces
Boundary surfaces pose more of a problem,since their data is not copied from
Hydromax to MS Excel.When you re-paste the sorted data back into Hydromax,
the boundary surface data will be lost and you must re-enter it in Hydromax.This
problem has been resolved in Hydromax 9.6.
8 Inclining experiment
This section describes how Hydromax may be used to simulate an inclining
experiment.This demonstrates the type of simulations that are possible using the
Specified Conditions and Equilibrium analysis methods.
The purpose of an inclining experiment is to determine:
· Lightship mass
· LCG
· GM
8.1 General inclining experiment procedure
Before carrying out an inclining experiment,the following vessel preparation is
required:
· vessel as complete as possible and surveyed to determine weights which will be
added or removed when in service
· boilers and engine sumps are at working levels
· tanks full or empty to avoid free surface effects; boats tight in derricks to avoid
virtual centres of gravity
· all unnecessary items and personnel ashore
· adequate bilge clearance
· inclining weights and spreads are checked and are perpendicular to centreline
8.1.1 Accurately determine vessel displacement and LCG
· density of fluid measured at several locations
· draughts measured at all draught marks
· from the draught marks and the vessel's hydrostatics,the mass and LCG can be
determined
8.1.2 Procedure to determine GM and KG
Weights (which are often made equal) are arranged as shown below:
The weights are then moved in the sequence specified below,and after each
movement,the heel angle is recorded (usually with a long pendulum).
The shift of a weight w by a distance d across the vessel will result in a transverse
movement of the vessel's centre of gravity from G to G'.The shift in the centre ofgravity is given by:
where D is the vessel's displacement.
7.1.3 Things to watch for:
The method described above will work without any complications for simple tanks
and compartments.However,there are two possible problems,which will occur if
any of them are linked or are defined with boundary surfaces.
7.1.3.1 Linked Tanks:
If you have linked tanks,before copying data in MS Excel,you should un-link them
by simply filling down the parent's Type into the Type of the linked tanks below it:
Select cells,then right-click to bring up the context menu and select Fill Down:
The Compartment definition window should now look like this:
Now you can proceed as before using MS Excel to sort the tanks into the desired
order.After you have pasted the sorted compartment data back into Hydromax,you
will need to re-link the tanks by typing Link or L into the relevant Type rows.
7.1.3.2 Boundary Surfaces
Boundary surfaces pose more of a problem,since their data is not copied from
Hydromax to MS Excel.When you re-paste the sorted data back into Hydromax,
the boundary surface data will be lost and you must re-enter it in Hydromax.This
problem has been resolved in Hydromax 9.6.
8 Inclining experiment
This section describes how Hydromax may be used to simulate an inclining
experiment.This demonstrates the type of simulations that are possible using the
Specified Conditions and Equilibrium analysis methods.
The purpose of an inclining experiment is to determine:
· Lightship mass
· LCG
· GM
8.1 General inclining experiment procedure
Before carrying out an inclining experiment,the following vessel preparation is
required:
· vessel as complete as possible and surveyed to determine weights which will be
added or removed when in service
· boilers and engine sumps are at working levels
· tanks full or empty to avoid free surface effects; boats tight in derricks to avoid
virtual centres of gravity
· all unnecessary items and personnel ashore
· adequate bilge clearance
· inclining weights and spreads are checked and are perpendicular to centreline
8.1.1 Accurately determine vessel displacement and LCG
· density of fluid measured at several locations
· draughts measured at all draught marks
· from the draught marks and the vessel's hydrostatics,the mass and LCG can be
determined
8.1.2 Procedure to determine GM and KG
Weights (which are often made equal) are arranged as shown below:
The weights are then moved in the sequence specified below,and after each
movement,the heel angle is recorded (usually with a long pendulum).
The shift of a weight w by a distance d across the vessel will result in a transverse
movement of the vessel's centre of gravity from G to G'.The shift in the centre ofgravity is given by:
where D is the vessel's displacement.
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