Journal of Marine Science and Technology

Journal of Marine Science and Technology

Analysis of correction methods for ship's measured speed during sea trials

Document Type : Original Manuscript

Authors
Mahboobeh Golaghapoor Kami
Mostafa Jafarzadeh Khatibani
Etemadaldin Rabei Gholami
Khorramshahr University of Marine Science and Technology, Faculty of Marine Engineering.
10.22113/jmst.2016.15780
Abstract
For all new ships sea trials should be carried out as a part of the delivery from the yard to the ship owner. An important part of the delivery sea trial is to determine the speed capability of the ship in the contractual condition, which is traditionally deep, calm water and no wind, at some specified loading condition. However, it is seldom possible to perform this particular test under such conditions, and when the test is done in other conditions, the result is corrected back to the contractual condition. The correction can be of a significant magnitude. The correction procedure can be influenced by different parameters such as wind resistance, shallow water effect, sea currents and added resistance due to diffraction. There are different experimental methods for correction of measured speed. Since the latter parameter is the most important between others, In this article added resistance due to diffraction has been calculated for three ships using existing methods and comparisoned with the speed correction result of shipbuilder company (Hyundai Heavy Industries). The results show considerable deviation between HHI sea trial speed correction method and other methods. So HHI added resistance calculation method needs to be revised.
Keywords
Sea trial
Added Resistance
Diffraction
Speed correction

Subjects

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Journal of Marine Science and Technology
Volume 16, Issue 3 - Serial Number 3
Autumn 2017
Pages 125-135

  • Receive Date 22 January 2015
  • Revise Date 24 June 2016
  • Accept Date 03 July 2016
  • Publish Date 23 October 2017