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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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Ship Design

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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

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


Design Through Selection


Basic Ship Types

  • Weight Critical Ships

  • Volume Critical Ships

  • Unit Cargo Ships


The Weight Equations (1)

s : displacement due to shell, appendages

L: LBP or LWL

B: Breadth

T: Draught


The Weight Equations (2)


DW/D Ratio


DW/D Ratio


Volume


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


Beam-Depth Relation


Beam-Draught Relation


Draught-Depth Relation


Length-Depth Relation


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


Block Coefficient (CB)


Hull Weight (WH)


Outfit Weight (WH)


Outfit Weight (WO)


Main Engine Weight


Main Engine Weight


Remainder Machinery Weight


Total MachineryWeight for Diesel-Electric Ships


Scrap Weight


Nmber of Containers


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