Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
A verification of the ITTC/ISO speed/power trials analysis
University of Tokyo, Japan.
University of Tokyo, Japan.
University of Tokyo, Japan.ORCID-id: 0000-0002-6266-2320
University of Tokyo, Japan.
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213, Vol. 20, nr 1, s. 2-13Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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’

Ort, förlag, år, upplaga, sidor
Springer Japan , 2015. Vol. 20, nr 1, s. 2-13
Nyckelord [en]
Speed, Correction method; Fully compatible; Guideline; Power curves; Power method; Power settings; Propulsive performance; Time-periods, Iterative methods
Nationell ämneskategori
Maskinteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-71792DOI: 10.1007/s00773-015-0304-7Scopus ID: 2-s2.0-84925519709OAI: oai:DiVA.org:ri-71792DiVA, id: diva2:1837931
Tillgänglig från: 2024-02-15 Skapad: 2024-02-15 Senast uppdaterad: 2024-02-15Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Person

Werner, Sofia

Sök vidare i DiVA

Av författaren/redaktören
Werner, Sofia
I samma tidskrift
Journal of Marine Science and Technology
Maskinteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 6 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf