8. Ship Maneuvering Motion due to Tugboats and Its Mathematical Model
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概要
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This paper presents results of free running model tests and simulation calculations concerning ship maneuvering motion due to tugboats. The free running model tests were carried out by the use of wind fans on the model deck which simulate the tug forces. The mathematical model for such maneuvering motions at low speed was developed on the basis of captive model tests which consist of the static drift test with whole range of drift angle and the yaw rotating test with several combinations of towing speed and yaw angular velocity. The simulation calculations according to the mathematical model were compared with the free running test results for typical maneuvers with tugboats. The simulation calculations show satisfactory agreement with the free running test results. This indicates that the mathematical model proposed in the present paper is available for describing a so-called low speed maneuvering motion.