Journal of Marine Science and Technology

, Volume 17, Issue 3, pp 291–304 | Cite as

Course stability and yaw motion of a ship in steady wind

Original article

Abstract

In order to achieve safe navigation, it is important to be able to understand and calculate the effects of an external force on the maneuvering behavior of a ship. This paper analyzes the course stability and yaw motion of a ship traveling under steady wind conditions. A course stability criterion and approximate formulae for the yaw motion in steady wind, including the aero/hydrodynamic force derivatives for the ship, are derived. To confirm the reliability of the criterion and formulae, they were used to investigate a pure car carrier in steady wind. The results of this investigation revealed that course instability appears in the head and following wind directions, mainly under the influence of aerodynamic derivatives with respect to the yaw restoring forces. However, this course instability can be reduced by applying steering control. For winds ranging from head winds to beam winds, yaw oscillation appears when the period is relatively long and the damping is small. The analytical formulae derived here can be used to gain a better understanding of ship maneuvering behavior in steady wind.

Keywords

Course stability Yaw motion Wind forces Maneuverability Pure car carriers Course stability criterion 

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Copyright information

© JASNAOE 2012

Authors and Affiliations

  • H. Yasukawa
    • 1
  • T. Hirono
    • 2
  • Y. Nakayama
    • 1
  • K. K. Koh
    • 3
  1. 1.Department of Transportation and Environmental SystemsHiroshima UniversityHigashihiroshimaJapan
  2. 2.Mitsubishi Heavy Industries, Kobe ShipyardKobeJapan
  3. 3.Universiti Teknologi MalaysiaJohorMalaysia

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