ENGINEERING LESSON GUIDE 18

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INTRODUCTION TO NAVAL ENGINEERING
SHIP DESIGN AND ENGINEERING
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BASIC DESIGN CONSIDERATIONS

• Seaworthiness
• Ships ability to operate in all types of weather
  and sea states
• Made up of several factors
• Stability
• Displacement
• Freeboard
• Beam
• Hull shape

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BASIC DESIGN CONSIDERATIONS (cont.)

• Structural Integrity
• Engineering design
• Weight
• Resistance to operational stresses and strains

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BASIC DESIGN CONSIDERATIONS (cont.)

• Operational Employment
• Mission
• Armament
• Protection
• Maneuverability
• Cruising Range

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BASIC DESIGN CONSIDERATIONS (cont.)

• Tradeoffs
• Cost
• Life expectancy
• Port facilities
• Prime mover machinery/engineering design

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FORCES
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STRESS

• Tension

• Compression

• Shear

• Torsion

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STRAIN

• Distortion resulting from stress
• Usually expressed in inches/inch

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SAGGING

• Deck under compression
• Neutral axis experiences no stresses
• Keel under tension

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HOGGING

• Deck under tension
• Neutral axis experiences no stress
• Keel under compression

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STRUCTURAL ELEMENTS OF A SHIP
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Principle structural elements of a warship

• Plating
• Keel
• Bottom
• Framing
• Transverse frames
• Longitudinal frames
• Bulkheads
• Decks

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COMPARTMENTAL NUMBERING SYSTEM
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4 PARTS3 - 75 - 4 - M

• Deck
• Main deck is 1
• Up is O1, O2, etc
• Going down is 2, 3, etc
• Frame
• Frame number at the foremost bulkhead of the
  enclosing boundary
• If between frames, forward one is used

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4 PARTS3 - 75 - 4 - M

• Compartment
• Centerline is 0
• Port are even
• Starboard are odd
• Use
• Capital letter designating use
• A Stowage L Living E Emergency
• G Gas M Ammo C Control

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SUBMARINE CONSTRUCTION
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Basic structural components of a submarine

• U.S. submarines employ a single hull design.
  Advantages include
• Larger interior volume
• Quieter
• Russian submarines employ a two-hull design.
  Advantages include
• Ease of fabrication
• Abilty to absorb damage

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QUESTIONS?
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Reading

• Introduction to Naval Engineering, Chapter 26
• Naval Orientation, pp. 17-9 - 17-12
• The Bluejackets Manual, Chapter 18