Indirect Measurements of Added Wave Resistance on an In-service Container Ship

Ulrik D. Nielsen*, Jacob R. Johannesen, Harry B. Bingham, Mogens Blanke, Soizic Joncquez

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

This paper investigates a semi-empirical model used to estimate added-wave resistance on a ship sailing in waves. The model relies on measurements from a continuous monitoring system, and produces an estimate - the indirect measurement - of added-wave resistance, based on the difference between, on the one side, the measured power and, on the other side, a summation of theoretically calculated resistance contributions but neglecting the component because of seaway. Hence, the added-wave power is obtained as the surplus. The model has been applied to more than three months of full-scale data recorded on an in-service operating container ship. The results indicate reasonable levels of the added-wave power, emphasising that both positive and negative values are obtained, since the model is not restricted to relative wave directions forward of beam. It is found that following waves often lead to 'negative resistance', in fact creating a thrust, but, importantly, following waves can also increase the total resistance significantly.
Original languageEnglish
Title of host publicationProceedings of the 14th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS 2019)
EditorsTetsuo Okada, Yasumi Kawamura, Katsuyuki Suzuki
Place of PublicationSingapore
PublisherSpringer
Publication date2021
Pages115-132
ISBN (Print)978-981-15-4623-5
ISBN (Electronic)978-981-15-4624-2
DOIs
Publication statusPublished - 2021
EventThe 14th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS 2019) - Yokohama, Japan
Duration: 22 Sep 201926 Sep 2019

Conference

ConferenceThe 14th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS 2019)
CountryJapan
CityYokohama
Period22/09/201926/09/2019
SeriesLecture Notes in Civil Engineering
Volume63
ISSN2366-2557

Keywords

  • Added-wave resistance
  • Indirect measurements
  • Continuous monitoring system
  • Following waves
  • Correction procedures

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