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1
EXPERIMENT (2)
BUOYANCY & FLOTATION (METACENTRIC HEIGHT)
By:
Eng. Motasem M. Abushaban.
Eng. Fedaa M. Fayyad.
2
ARCHIMEDES’ PRINCIPLE
Archimedes’ Principle states that the buoyant force has a magnitude equal to the weight of the fluid displaced by the body and is directed vertically upward.
• Buoyant force is a force that results from a floating or submerged body in a fluid.
• The force results from different pressures on the top and bottom of the object.
W is the weight of the shaded areaF1 and F2 are the forces on the plane surfacesFB is the buoyant force the body exerts on the fluid
3
ARCHIMEDES’ PRINCIPLE
The force of the fluid on the body is opposite, or vertically upward and is known as the Buoyant Force.
The force is equal to the weight of the fluid it displaces.
The buoyant forces acts through the centroid of the displaced volume
The location is known as the center of buoyancy.
4
STABILITY: SUBMERGED OBJECT
Stable Equilibrium: if when displaced returns to equilibrium position.
Unstable Equilibrium: if when displaced it returns to a new equilibrium position.
Stable Equilibrium: Unstable Equilibrium:
C > CG, “Higher” C < CG, “Lower”
5
STABILITY: SUBMERGED OBJECT
If the Centre of Gravity is below the centre of buoyancy this will be a righting moment and the body will tend to return to its equilibrium position (Stable).
If the Centre of Gravity is above the centre of buoyancy ,an overturning moment is produced and the body is (unstable).
Note that, As the body is totally submerged, the shape of displaced fluid is not altered when the body is tilted and so the centre of buoyancy unchanged relative to the body.
6
BUOYANCY AND STABILITY: FLOATING OBJECT
Slightly more complicated as the location of the center buoyancy can change:
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METACENTRE AND METACENTRIC HEIGHT
Metacentre point (M): This point, about which the body starts oscillating.
Metacentric Height: Is the distance between the centre of gravity of floating body and the metacentre.
8
STABILITY OF FLOATING OBJECT
If M lies above G a righting moment is produced, equilibrium is stable and GM is regarded as positive.
If M lies below G an overturning moment is produced, equilibrium is unstable and GM is regarded as negative.
If M coincides with G, the body is in neutral equilibrium.
9
DETERMINATION OF METACENTRIC HEIGHT
1- Practically :
2- Theoretically: MG = BM + OB – OG……..........(2)
In Water
OB = 0.5 db
V
.
11
PURPOSE:
To determine the metacentric height of a flat
bottomed vessel in two parts:
PART (1) : for unloaded and for loaded pontoon.
PART (2) : when changing the center of gravity
of the pontoon.
12
EXPERIMENTAL SET-UP: The set up consists of a small water tank
having transparent side walls in which a small ship model is floated, the weight of the model can be changed by adding or removing weights. Adjustable mass is used for tilting the ship, plump line is attached to the mast to measure the tilting angle.
14
PROCEDURE1. Assemble the pontoon by positioning the
bridge piece and mast.2. Weigh the pontoon and determine the
height of its center of gravity up the line of the mast.
3. Fill the hydraulic bench measuring tank with water and float the pontoon in it, then ensure that the plumb line on the zero mark.
4. Apply a weight of 50 g on the bridge piece loading pin then measure and record the angle of tilting and the value of applied weight
15
PROCEDURE
5. Repeat step 4 for different weights; 100, 150, & 200 g, and take the corresponding angle of tilting.
6. Repeat the above procedure with increasing the bottom loading by 2000 gm and 4000 gm.
7. Record the results in the table.8. Calculate GM practically where , W has three
cases.9. Draw a relationship between θ (x-axis) and GM
(y-axis), then obtain GM when θ equals zero.10. Calculate GM theoretically.
16
Bilge Weight
Off balance wt.
Mean Def.
Exp. GM
GM at θ =0
BM OBTheo. GM
Wb (gm) P (gm)θ
(degree)(mm)
from graph
(mm) (mm) (mm)
0.00 50
100
150
200
2000.00 50
x1 = 30 100
150
200
4000.00 100
x1 = 37.5 150
200
250
Pontoon measurement:- Pontoon dimension : Depth (D) = 170 mm Length (L) = 380 mm, Width (W) = 250 mm.-The height of the center of gravity of the pontoon is OGvm = 125 mm fromouter surface of vessel base.- The balance weight is placed at x = 123 mm from pontoon center line.- The weight of the pontoon and the mast Wvm = 3000 gm
17
PURPOSE:
To determine the metacentric height of a flat
bottomed vessel in two parts:
PART (1) : for unloaded and for loaded pontoon.
PART (2) : when changing the center of gravity
of the pontoon.
18
Remember:
- Pontoon dimension : Depth (D) = 170 mm
Length (L) = 380 mm,
Width (W) = 250 mm.
- The height of the center of gravity of the pontoon is
OGvm = 125 mm from outer surface of vessel base.
- The balance weight is placed at x = 123 mm from
pontoon center line.
- The weight of the pontoon and the mast Wvm =
3000 gm
19
PROCEDURE PART (2) : when changing the center of gravity of the pontoon.
1. Replace the bilge weights by 4x 50 gm weights.
2. Apply a weight of 300gm on a height of 190 mm from
the pontoon surface.
3. Apply weights of 40, 80 &120 gms on the bridge piece
loading pin, then record the corresponding tilting
angle.
4. Calculate GM practically where
5. Draw a relationship between θ in degrees (x-axis) and
GM Practical (y-axis), then obtain GM when θ equals
zero.
.3500
)123(PGM
20
PROCEDURE
6. Move 50 gm bilge weight to the mast ahead,
then repeat steps 3,4&5.7. Repeat step 6 moving 100, 150 & 200 gm
bilge weight to the mast.
8. Determine the height of the center of
gravity for each loading condition according
to equation
W
LWmWbWbWvm
OG
)2
790()190(1)35()125(
22
8. Calculate GM theoretically according to equation
GM (Th.) = BM + OB – OG
Notice: BM & OB are constants for all loading conditions, since the dimensions & the weight of pontoon do not alter.
23
Off balance wt. Mean Def. Exp. GM BM OG Theo. GM
P (gm) θ (degree) (mm) (mm) (mm) (mm)
Mast Weight = 0.0
40 2.40
80 4.88
120 7.50
Mast Weight = 50.0
40 3.45
80 7.23
120 10.50
Mast weight = 100.0 20 3.28
40 6.35
80 12.00
Mast Weight = 150.0
10 3.70
20 10.23
40 14.78
Mast weight = 200.0
Unstable
Table (2) \ Part (2)