View
255
Download
8
Tags:
Embed Size (px)
Citation preview
Ship Design
Ship Life Cycle
• Definition of Requirement• Determination of Data and Constraints• Concept Design• Preliminary Design• Contract Design• Detail Design• Production• Tests and Trials• Service• Scrapping
Design Spiral
Definition of Requirements
Definition of RequirementsLength
BreadthDepthDraught
Form
Power
Area
WeightDisplacement
General Arrangement
Range
SeakeepingManouvrability
Strength
EconomicAnalysis
Constraints(Design)
Constraints(Design Process)
COnstraints(Design Environment)
Next Design Step
Choice
Empirical Calculations
Form Selection
MachinerySelection
Ship Type
Type Ship Area/
Weight
WeatherDeckArrangement
Calculationsr
PreliminaryControl
Longitudinal Strength
Ship Life
Design Through Selection
Basic Ship Types
• Weight Critical Ships
• Volume Critical Ships
• Unit Cargo Ships
The Weight Equations (1)
)1( sLBTCB s : displacement due to shell, appendages
L: LBP or LWL
B: Breadth
T: Draught
The Weight Equations (2)
CARGOLIQUIDS
MOH
WWDW
WWWLS
where
DWLS
DW/D Ratio
DW/D Ratio
Volume m
urCBDh V
S
VVLBDCV
)1(
Curh )/KV-(VV umh VVV
Volume
Length Beam Relation
Ship Length
Critical Factors Effecting Ship Length
• Construction limitations of the shipyard (Length of slipway, port limitations, canal limitations etc)
• Structural-Regulative limitations (number of bulkheads,
• Interference of bow waves and stern waves
• L/D limitations of class societies
Breadth
• Resistance (L/B) considerations suggests minimum breadth
• Stability (B/T, B/D) considerations suggests maximum breadth
Length-Breadth Relation
Length-Breadth Relation
L130 6.5L/B
130L30 30025004
30L 0.4/
)(L..L/B
BL
Beam-Depth Relation
Beam-Draught Relation
Draught-Depth Relation
Length-Depth Relation
Block Coefficient (CB)Alexander Formula
f
k
L
VKCB 5.0
K varies between 1.03 for high speed ships to 1.12 for slow ships
• Lf : Ship length in feet
• Vk : Ship speed in knots
Block Coefficient (CB)
Hull Weight (WH)
Outfit Weight (WH)
cLBWo
Outfit Weight (WO)
Main Engine Weight
Main Engine Weight
Remainder Machinery Weight
Total MachineryWeight for Diesel-Electric Ships
Scrap Weight
Nmber of Containers