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Naval Architecture & Ocean Engineering
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EN455: Seakeeping and Maneuvering

Catalog Description

EN455: Seakeeping and Maneuvering (3-2-4).

Topics include ship steering, maneuvering, motion and seakeeping. The basic equations of motion for a maneuvering ship and for ship motions in a seaway are developed, and various methods of solution are discussed. The course also covers the experimental aspects of seakeeping and maneuvering.

Textbook

E. V. Lewis, Editor, Principles of Naval Architecture, Vol. III, SNAME, 1988

References

  1. Lloyd, A.R.J.M., Seakeeping: Ship Behaviour in Rough Water, ARJM Lloyd, Gosport, Hampshire, UK, 1998. (Out of Print)
  2. Bhattacharyya, R.B., Dynamics of Marine Vehicles, John Wiley and Sons, New York, NY, 1978. (Out of Print).

Goals

  1. Understand the use and limitations of linear wave theory to represent deep ocean waves.
  2. Understand the limitations of linear strip-theory and be able to use it to determine transfer functions for the pitch, heave, and roll motions of a marine vehicle.
  3. Be able to produce a motion spectrum for a particular ship given the transfer functions (RAO’s) for the ship and a desired sea state and wave spectrum type.
  4. Understand the concepts of straight-line directional stability and its relationship to the linearized equations of motion for maneuvering.
  5. Understand the forces on a ship in a turn and the effect of the ship characteristics and rudder on turning ability.
  6. Be able to use the laboratory equipment and instrumentation to generate and measure both regular and irregular seas and measure their effects on ships.
  7. Have the ability to use digital signal processing techniques to analyze the data measured in laboratory experiments on ship motions.

Prerequisites

EN353 Resistance and Propulsion, NAOE Department

Class Topics

  1. Harmonic Motion Review (3 classes)
  2. Regular Waves (4 classes)
  3. Ocean Waves/Wave Spectrum (4 classes)
  4. Vibration Review (3 classes)
  5. Linearized Equations of Motion (2 classes)
  6. Strip Theory (4 classes)
  7. Coupled Heave and Pitch Motions (5 classes)
  8. Linearized Roll Motion (3 classes)
  9. Ship Motions in Regular Waves (4 classes)
  10. Ship Motions in Irregular Waves (2 classes)
  11. Seakeeping Considerations in Design (4 classes)
  12. Maneuvering – Linearized Equations of Motion (4 classes)
  13. Controls-fixed Directional Stability (2 classes)
  14. Analysis of Turning Ability (2 classes)
  15. Rudder Design Considerations (2 classes)

Laboratory Projects

  1. Water Wave Mechanics – Regular Waves
  2. Water Wave Mechanics – Irregular Waves
  3. Dynamic Model Ballasting
  4. Measuring Added Mass in Sway
  5. Head Seas Testing: Wave Induced Motions
  6. Computer-based Motions Prediction
  7. Rolling Motion at Zero Speed in Beam Seas
  8. Rudder Testing in Circulating Water Channel
  9. LAPMM Testing – Static
  10. LAPMM Testing – Dynamic
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