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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. Definition of Requirements. Length. Definition of Requirements. Breadth Depth

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Presentation Transcript

Ship life cycle l.jpg
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 l.jpg

Definition of Requirements

Length

Definition of Requirements

Breadth

Depth

Draught

Economic

Analysis

Choice

Ship

Life

Empirical

Calculations

Strength

Constraints

(Design)

Longitudinal

Strength

Form

Seakeeping

Manouvrability

Form

Selection

Preliminary

Control

Constraints

(Design Process)

Calculationsr

Machinery

Selection

Power

Range

Weather

Deck

Arrangement

COnstraints

(Design Environment)

Ship

Type

Type

Ship

Area/

Weight

General

Arrangement

Area

Displacement

Weight

Next Design Step

Design Spiral



Basic ship types l.jpg
Basic Ship Types

  • Weight Critical Ships

  • Volume Critical Ships

  • Unit Cargo Ships


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The Weight Equations (1)

s : displacement due to shell, appendages

L: LBP or LWL

B: Breadth

T: Draught



Dw d ratio l.jpg
DW/D Ratio


Dw d ratio9 l.jpg
DW/D Ratio






Critical factors effecting ship length l.jpg
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


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Breadth

  • Resistance (L/B) considerations suggests minimum breadth

  • Stability (B/T, B/D) considerations suggests maximum breadth





Beam d raught relation l.jpg
Beam-Draught Relation




Block coefficient c b alexander formula l.jpg
Block Coefficient (CB)Alexander Formula

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










Scrap weight l.jpg
Scrap Weight



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