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A verification of the ITTC/ISO speed/power trials analysis

Strasser, G. (author)
University of Tokyo, Japan
Takagi, K. (author)
University of Tokyo, Japan
Werner, Sofia (author)
University of Tokyo, Japan
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Hollenbach, U. (author)
University of Tokyo, Japan
Tanaka, T. (author)
University of Tokyo, Japan
Yamamoto, K. (author)
University of Tokyo, Japan
Hirota, K. (author)
University of Tokyo, Japan
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 (creator_code:org_t)
2015-01-13
2015
English.
In: Journal of Marine Science and Technology. - : Springer Japan. - 0948-4280 .- 1437-8213. ; 20:1, s. 2-13
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Speed and power (S/P) trials are most important to guarantee the ship’s propulsive performance. However, it was pointed out that the existing procedures often give a good guideline, but are not specific and can introduce inconsistent results. Recently, ITTC and ISO have improved their S/P trials procedures and harmonized the two procedures. During the harmonization process, we have verified the ‘Mean of Means’ (MoM) method and the ‘Iterative’ method which are used as the current correction methods and the ‘Direct Power Method’ and the ‘Extended Power Method’ which are applied for the evaluation of the acquired data. The results of verification are presented in this paper. The results show that using the ‘MoM’ method for each power setting, two double runs should be made to keep the accuracy of S/P trials, and the ‘Iterative’ method leads to less errors in average of the tested cases when 1 + 2 + 2 double runs are used in the ‘MoM’ method, although the methods are equally adequate if the time periods between the runs are short enough. In specific cases, e.g. in case of large speed range and/or humps and hollows within the speed–power curve, the ‘MoM’ method has advantages over the ‘Iterative’ method. In case of current time history deviating from the assumed parabolic/sinusoidal trend and the change of the current within the time span of two double runs is very high, neither of the methods are applicable. Summarizing the results, the ‘Iterative’ method is fully compatible with the simple ‘Direct Power Method’

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

Keyword

Speed
Correction method; Fully compatible; Guideline; Power curves; Power method; Power settings; Propulsive performance; Time-periods
Iterative methods

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ref (subject category)
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Strasser, G.
Takagi, K.
Werner, Sofia
Hollenbach, U.
Tanaka, T.
Yamamoto, K.
show more...
Hirota, K.
show less...
About the subject
ENGINEERING AND TECHNOLOGY
ENGINEERING AND ...
and Mechanical Engin ...
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