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Experimental Study on Ship Added Resistance in Wave

Hajizadeh, Sajjad | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40902 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed; Mehdigholi, Hamid
  7. Abstract:
  8. In the ship designing, it is preferable to access to a good performance in waves and low efficiency loss. Accordingly, modeling and estimation of added resistance would be an important issue. Added resistance in wave is an important part of ship's performance due to many technical and economic effects on the ship's performance. With understanding and awareness of the added resistance that comes from ship accident to the waves, we can reduce this parameter by changing in specifications and hull form of ships. Designers are also interested in optimizing the ship from this aspect. In previous works, added resistance in waves was obtained from experimental, numerical and analytical methods. In this thesis, after understanding of waves and describing the way for creating them in the laboratory of Marine Engineering, We present the performed experiments in regular waves and conditions that waves accident with ship in head sea. Then the added resistance has been calculated as the difference between the average ship resistance in waves and calm water at identical speed. Also, a numerical code has been written based on Savitsky empirical equations in order to express the coupled Heave and Pitch movements. By using this code the ship added resistance can be calculated. Finally, the effects of amplitude, length waves and ship speed on the amount of ship added resistance have been investigated and the experimental and numerical results have been compared. Based on the presented results, the maximum added resistance occurs when the vertical motion of ship (Heave and Pitch) are in resonance mode.
  9. Keywords:
  10. Waves ; Heave Boat ; Ship Model ; Added Resistance

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