Assessment of added resistance estimates based on monitoring data from a fleet of container vessels

Malte Mittendorf*, Ulrik Dam Nielsen, Harry B. Bingham, Jesper Dietz

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A practical estimation methodology of the mean added resistance in irregular waves is shown, and the present paper provides statistical analyses of estimates for ships in actual conditions. The study merges telemetry data of more than 200 in-service container vessels with ocean re-analysis data from ERA5. Theoretical estimates relying on spectral calculations of added resistance are made for both long- and short-crested waves and are based on a combination of a parametric expression for the wave spectrum and a semi-empirical formula for the added resistance transfer function. The theoretical estimates are compared to predictions from an indirect calculation of added resistance relying on shaft power measurements and empirical estimates of the remaining resistance components. Overall, the comparison reveals a bias in bow oblique waves and higher sea states of the spectral estimates as well as the large variance of the empirically derived predictions — particularly in beam-to-following waves. One of the study’s main findings, confirming previous studies but based on a much larger dataset than in earlier similar studies, is that added resistance assessment based on in-service data is complex due to significant associated uncertainties.
Original languageEnglish
Article number113892
JournalOcean Engineering
Volume272
Number of pages16
ISSN0029-8018
DOIs
Publication statusPublished - 2023

Keywords

  • Added resistance
  • Fleet performance data
  • Metocean hindcast data
  • Parametric wave spectrum
  • Resistance decomposition
  • Spectral calculation

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