Analysis of correction methods for ships' measured speed during sea trials
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.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Persian |
| Published: |
2017
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| Subjects: | Method, Speed, Sea trial, Added resistance, Diffraction, Speed correction, HHI, |
| Online Access: | http://hdl.handle.net/1834/13442 |
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| Summary: | 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. |
|---|