An Efficiency Optimizing Shaft Speed Control for Ships in Moderate Seas

Mogens Blanke, Luca Pivano, Tor Arne Johansen

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

Abstract

Ships in moderate sea experience time-varying thrust and torque load on the shaft of their prime mover. The reason is the varying inflow velocity to the propeller during the passage of a wave. This variation has been considered a nuisance to the main engine control where the induced fluctuations in torque, shaft speed and power have been suppressed by some control schemes and ignored in others. This paper shows how the fluctuation in inflow velocity can be utilized to increase the average efficiency of propulsion in waves without reducing the vessel speed. A non-linear controller is proposed that is shown to theoretically enhance the propulsion efficiency. Model tests determine dynamic characteristics of propellers in waves and a simulation is employed to validate the novel control scheme.
Original languageEnglish
Title of host publicationControl Applications in Marine Systems
Volume7
Publication date2007
ISBN (Print)978-3-902661-62-3
DOIs
Publication statusPublished - 2007
Event7th IFAC Conference on Control Applications in Marine Systems - Bol, Croatia, Croatia
Duration: 19 Sep 200721 Sep 2007
Conference number: 7
http://www.ifac-papersonline.net/Control_Applications_in_Marine_Systems/7th_IFAC_Conference_on_Control_Applications_in_Marine_Systems__2007_/index.html

Conference

Conference7th IFAC Conference on Control Applications in Marine Systems
Number7
CountryCroatia
CityBol, Croatia
Period19/09/200721/09/2007
Internet address

Keywords

  • Shaft speed control
  • Ship propulsion
  • Optimal control
  • Fuel economy

Cite this

Blanke, M., Pivano, L., & Johansen, T. A. (2007). An Efficiency Optimizing Shaft Speed Control for Ships in Moderate Seas. In Control Applications in Marine Systems (Vol. 7) https://doi.org/10.3182/20070919-3-HR-3904.00058