Icebreaking design

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Icebreaking Design

The efficient breaking and displacement of ice relies on an appropriate use of mass, hull form, power, and assistive systems to displace ice around an ice-going ship. As the interaction of ship and ice is complex, and icebreaking ships tend to be large & costly affairs, hull variations will be tested in ice tanks well before production. It has also been the case that ships have had entire bow sections replaced, where additional research or operational experience have demonstrated potential benefits.

Contents

Process of Breaking Ice

  • Continous mode
  • Crushing, ramming
  • Induced forces

Ice-breaking Hull Forms

  • Bulbous bows & bow propellers
  • Melville bow
  • Spoon bow
  • Gulfspan design
  • White bow
  • Reamers
  • Double-acting

Assistive Systems for Icebreaking

  • Bubbler system
  • Water deluge system
  • Heeling tanks
  • Low-friction & resilient coatings

Structural Augmentation

  • Ice knife
  • Ice horn
  • Ice belt
  • Ice frames
  • Canted structure
  • Steel grades for cold weather
  • Ice contact loads & global strength considerations

Machinery & Systems Augmentation

  • Heating & Heat Recovery
  • Prop/ice interaction
  • Powering requirements
  • Vibration analysis
  • Propulsors and arrangements for use in ice

Classification & Regulation of Ice Vessels

  • IACS Polar Classes
  • ASPPR Requirements
  • Swedish-Finnish Maritime Association Rules
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