A disturbance accommodating controller for roll motion of a ship in irregular seaways

Sunghoon Kim, K. P. Rhee, Sangmoo Lee

Research output: Contribution to conferencePaper

Abstract

An adaptive operation of a disturbance accommodating controller(DAC) depending on the seastate number for roll motion of a ship is suggested. DAC suggested in this paper assumes the shape of the disturbance, i. e. the wave slope excitation as a harmonic signal that consists of two sine waves of different frequencies and the dynamic model of this kind of disturbance is adopted in the controller to estimate the disturbance from the measurement of roll and to generate the control force to counteract exactly the estimated disturbance, Frequencies of the disturbance model used in the controller are selected so that the energy of the roll response in each seastate is to be minimized. Pole placement technique is combined to enhance the performance of DAC. A necessity of an adaptation scheme i. e. tuning the suggested DAC according to the varying sea environment is also shown by the results of the performance assessment of DAC's with different sets of design frequencies optimized for each seastate.

Original languageEnglish
PagesX189-195
Publication statusPublished - 2002 Dec 1
EventProceedings of the Fifth (2002) ISOPE Pacific/Asia Offshore Mechanics Symposium - Daejeon, Korea, Republic of
Duration: 2002 Nov 172002 Nov 20

Conference

ConferenceProceedings of the Fifth (2002) ISOPE Pacific/Asia Offshore Mechanics Symposium
CountryKorea, Republic of
CityDaejeon
Period02/11/1702/11/20

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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    Kim, S., Rhee, K. P., & Lee, S. (2002). A disturbance accommodating controller for roll motion of a ship in irregular seaways. X189-195. Paper presented at Proceedings of the Fifth (2002) ISOPE Pacific/Asia Offshore Mechanics Symposium, Daejeon, Korea, Republic of.