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BANGLADESH UNIVERSITY OF ENGINEERING & TECHNOLOGY
NAME 338SHIP DESIGN PROJECT & PRESENTATION-IIDATE-25 OCTOBER,2010
DESIGN OF A WATER TAXI FOR 95 PASSENGERS IN SADARGHAT-ASHULIA ROUTE
Project SupervisorKhabirul Haque ChowdhuryProfessorDepartment of Naval Architecture & Marine Engineering,BUET
Presented By-Hasib-Ul-Haque (0712014)Ahmad Shibli Saleheen (0712018)
OBJECTIVES
To take advantage of Dhaka city’s circular waterway. To ease the water way communication with comfortable
service. To reduce the pressure on land transport. To safe people from horrible traffic jam. To establish a modern transport system which is more.
safe, affordable, technologically dependable, environment friendly, and acceptable to all citizens of the country.
THE TOPICS OF OUR SECOND PRESENTATION INCLUDES-
SCANTLING
DETAIL DEADWEIGHT & LIGHTWEIGHT CALCULATION
STABILITY & TRIM CALCULATION
PRINCIPAL PARTICULARS
Length over all (LOA) 25.79 m
Length between perpendicular (LBP)
24.3 m
Breadth mld. (B) 6.3 m
Depth mld. (D) 2.6 m
Draft (T) 1.5 m
Dispalcement (Δ) 123.48 tons
GENERAL ARRANGEMENT
GENERAL ARRANGEMENT
SCANTLING CALCULATIONWe have used ISSA rule book for our scantling calculation
MEMBER DIMENSION (in mm)
Centre Keelson T-219×55×5.5
Side Keelson T-199×55×5.5
Floor T-219×55×5.5
Main Frame L-75×50×5
Web Frame T-128×50×5
Side Stringer T-128×50×5
Deck Web L-128×50×5
Deck Beam L-90×60×6
Deck Girder T-128×50×5
SCANTLING CALCULATION
MEMBER DIMENSION (in mm)
Roof Centre Girder L-60×40×5
Roof Beam L-60×40×5
Bracket L-75×75×5
SCANTLING CALCULATION
PLATE THICKNESS (in mm)
Keel Plate 7
Bottom Plate 7
Bilge Plate 7
Side shell Plate 6
Deck Plate 6
Bracket 5
Transverse Bulkhead 4
MIDSHIP CONSTRUCTION
MIDSHIP CONSTRUCTION
MIDSHIP CONSTRUCTION
DEADWEIGHT CALCULATION
DEADWEIGHT CALCULATION
No of person on board:No of passenger = 100
No of crew = 6
Total = 106
Weight allowance per person:Weight per person = 75 kg
Luggage per person = 5 kg
Total = 80 kg
Total weight for persons = 80× 106 = 8.48 tons
CAPACITY CALCULATION
SAMPLE CALCULATION OF FRESH WATER TANK (PORT & STARBOARD
SIDE)
Area of
Station
SM Volume Functio
n
Lever Moment function
about left Wall
2.066 1 2.066 0 0
2.154 4 8.616 1 8.616
2.081 1 2.081 2 2.081
12.76 10.697Station spacing = 1.575 m Volume of tank= 6.7 m3 Weight of fresh water= 6.7 tons
SAMPLE CALCULATION OF FUEL TANK (PORT & STARBOARD SIDE)
Area of
station
SM Volume Functio
n
Lever Moment function
about left wall
3.32 1 3.32 0 0
3.723 4 14.892 1 14.892
4.132 1 4.132 2 8.264
23.156Station spacing = 1.8 mVolume of tank= 0.83 m3 Weight of disel oil= 0.75 tons
SUMMARY OF DEADWEIGHT
TYPE DEADWEIGHT (tons)
Persons 8.48
Fuel oil 1.5
Lube oil 0.5
Fresh water 3
Storage 2
Allowance 2
Total deadweight 17.48
LIGHTWEIGHT CALCULATION
SHELL EXPANSION
CALCULATION OF WEIGHT OF PLATES
MEMBER AREA (m²) THICKNESS (m)
WEIGHT (tons)
Shell plate 45.28 6 4.24
Bilge Plate 29.41 7 3.21
Keel Plate 12.72 7 1.39
Bottom plate 22.54 7 2.46
Total =11.3
WEIGHT OF OTHER ITEMSITEM WEIGHT (tons)
Centre keelson 0.94
Side keelson 2.37
Floor plate 4.24
Main frame 6.24
Web frame 5.38
Side stringer 1.54
Deck girder 0.814
Deck web 3.69
Deck beam 1.97
Deck plate 1.34
Roof girder 1.22
Roof beam 0.86
Bracket 0.6
WEIGHT OF OTHER ITEMSBulkhead 1(st .5) 0.19
Bulkhead 2(st 2) 0.25
Bulkhead 3(st 4) 0.32
Bulkhead 4(st 5) 0.33
Bulkhead 5(st 7) 0.25
Bulkhead 6(st 8.5) 0.18
Gear box 0.8
Propeller 0.55
Propeller shaft 0.6
Rudder 0.4
Winch 0.5
Anchor 1
Pump 0.12
Main engine 0.510
Seating arrangement 5
Wood and outfit 5
Glass of window 2
Generator 0.726
Miscellaneous 5
Total 57.2
So,the total lightweight of the vessel is = (11.3+61.25) tons
= 72.55 tons
Therefore,
the displacement of the vessel= Lightweight+Deadweight
= 72.55 + 44.96
= 117.51 tons
Which was previously 123.48 tons
STABILITY & TRIM CALCULATION
STABILITY CALCULATION
ANGLE OF INCLINATION(degree)
RIGHTING LEVER,GZ (m)
0 0
15 1.378
30 2.167
45 2.170
60 1.7
75 0.94
90 -0.38
GZ SAMPLE CALCULATION AT 30°INCLINATIONImmerged
Side
Section
Ordinate
Multiplier
s
Functions of Ordin
ate
Square of ordina
tes
Functions of
Squares
Cubes of
Ordinates
Functions of cubes
0 2.513 0.5 1.257 6.315 3.158 15.870 7.935
0.5 2.513 2 5.026 6.315 12.630 15.870 31.740
1 2.513 1 2.513 6.315 6.315 15.870 15.870
1.5 2.513 2 5.026 6.315 12.630 15.870 31.740
2 2.513 1.5 3.770 6.315 9.473 15.870 23.805
3 2.513 4 10.052 6.315 25.261 15.870 63.480
4 2.513 2 5.026 6.315 12.630 15.870 31.740
5 2.513 4 10.052 6.315 25.261 15.870 63.480
6 2.477 2 4.954 6.136 12.271 15.198 30.395
7 2.477 4 9.908 6.136 24.542 15.198 60.791
8 2.477 1.5 3.716 6.136 9.203 15.198 22.797
8.5 2.477 2 4.954 6.136 12.271 15.198 30.395
9 2.477 1 2.477 6.136 6.136 15.198 15.198
9.5 2.477 2 4.954 6.136 12.271 15.198 30.395
10 0 0.5 0 0.000 0.000 0.000 0
73.684 184.052 459.762
Emmersed Side
Section
Ordinate
Multipliers
Functions of Ordina
te
Square of ordinates
Functions of Square
s
Cubes of
Ordinates
Functions of cubes
0 0.546 0.5 0.273 0.298 0.149 0.163 0.081
0.5 1.012 2 2.024 1.024 2.048 1.036 2.073
1 1.390 1 1.390 1.932 1.932 2.686 2.686
1.5 1.754 2 3.508 3.077 6.153 5.396 10.792
2 2.028 1.5 3.042 4.113 6.169 8.341 12.511
3 2.362 4 9.448 5.579 22.316 13.178 52.711
4 2.574 2 5.148 6.625 13.251 17.054 34.108
5 2.577 4 10.308 6.641 26.564 17.114 68.455
6 2.279 2 4.558 5.194 10.388 11.837 23.674
7 1.853 4 7.412 3.434 13.734 6.362 25.450
8 1.417 1.5 2.126 2.008 3.012 2.845 4.268
8.5 1.138 2 2.276 1.295 2.590 1.474 2.948
9 0.839 1 0.839 0.704 0.704 0.591 0.591
9.5 0.490 2 0.980 0.240 0.480 0.118 0.235
10 0 0.5 0 0 0 0 0
53.332 109.491
240.581459.76
2
700.343
GZ SAMPLE CALCULATION AT 30° INCLINATION
Inclinations of radial
planes
Functions of squares
of ordinates(Immersed
Side)
Functions of squares
of ordinates(Emmersed
Side)
Multipliers
Functions of squares of
ordinates for volumes of
wedges(Immersed Side)
Functions of squares of
ordinates for volumes of
wedges(Emmersed Side)
Sums of functions
of cubes of ordinates for both
side
Products of sums of
functions of cubes for both
sides
Cosines of inclinations
of radial planes
(cos(15-0 to 15))
Functions of cubes for
moments of wedges
0 214.4562 332.1834 1 214.4562 332.1834 1936.01 1936.01 0.866 1676.634
15 270.5914 166.3982 4 1082.365 665.5929 1293.792 5175.166 0.966 4998.827
30 184.052 109.4907 1 184.052 109.4907 700.3431 700.3431 1.000 700.343
1480.874 1107.267 7375.80393
AREA AND POSITION OF C.G. OF RADIAL PLANE
Function of area
Funcion of moment
Immersed 73.6835 184.052Emerged 53.3315 109.4907Summation and diff 127.015 74.56133
Area(1/3*2.43*127.015*2) =205.764 m² CG of radial plane immersed side =0.294 mThicknes of the layer(Volume/Area) =0.128 m
Volume of Immersed wedge= 1480.874 m3
Volume of Emerged wedge= 1107.267 m3
Difference= 373.6067 m3
Volume of the Layer(1/2*(1/3*2.43)*(1/3*.2616)*373.607)*2= 26.39352 m3
Uncorrected moment (1/3*(1/3*2.43)*(1/3*.2616)*7375.8393)*2 =347.40Correction for layer (CG*volume) =7.747Difference =339.653Volume of Displacement in m³ =123.48BR=(moment difference/displacement in m³) =2.75067BG=(KG-KB) =0.74GZ=BR-BGsin 30° =2.17 m
V.C.G from keel= 2.08 mKB = 0.92 m
GZ CURVE
0 10 20 30 40 50 60 70 80 90 100
-1
-0.5
0
0.5
1
1.5
2
2.5
Angle of inclination
GZ
(m
)
COMPARISON WITH IMO 167 REGULATION FOR STABILITY CRITERIA
CRITERIA REQUIRED OBTAIN
Area from 0 to 30 deg.
0.055 m rad 0.64 m rad
Area from 0 to 40 deg.
0.09 m rad 1.03 m rad
Area from 30 to 40 deg.
0.03 m rad 0.387 m rad
GZ at 30 deg. 0.2 m 2.17 m
Angle of max. GZ ≥25 deg 36 deg.
GM value (min.) for L≤70
0.35 m 1.96 m
TRIM CALCULATION
LCB At LWL = 1.12 m aft of amidshipLCG of total ship = 1.29 m aft of amidshipDisplacement of the Ship = 123.48 tonneAt LWL, MCT1m = 189.77 tonne-m C.F. = 1.22 m aft of amidship Draft = 1.5 m[The value of LCB,MCT1m,C.F. are taken from the Hydrostatic Calculations earlier in the design procedure]
TRIM CALCULATION
Now,Amount of Trim={(1.29-1.12)*123.48}/189.77
= 0.1106 m So,
Change in Trim aft= 0.05 mChange in Trim Forward= 0.06 m
Therefore, resulting
Draft Forward= 1.5+0.06 = 1.56 m
Draft Aft= 1.5- 0.05 = 1.45 m
THANK YOU