被曳航BARGEの針路安定性に関する実験的研究

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The ever-increasing demand for barges presents an immediate problem due to the fact that the barge towed by a tug often swings greatly. This problem is of crucial importance when a towed barge negotiate restricted or crowded water. However the course stability of a towed barge depends on many factors; the method of towing as well as the respective stability of the barge and tug play a significant role. Further, since barges in general have principal dimensions and hull-form of different kinds from conventional ships, the estimate of the stability of barge is a formidable problem. In this paper experimental studies on the course stability of a towed barge are presented, covering two kinds of tests: (i) The respective force and moment acting on a barge and skegs were measured by means of oblique towing test, i.e. the influence of the type of skegs as well as their locations on the stability was clarified. & (ii) Towing tests with systematically varied tow-line and bridle lengths were carried out, and the barge motions were investigated. The following results relating to the course stability of a towed barge were obtained: (1) The barge equipped with skegs is more stable than that without skegs. Two Slot Skeg is more effective than any other types tested. (2) It is advisable for the distance between skegs symmetrical with respect to the center line of the barge to be as long as possible. (3) The longer the tow-line and bridle lengths are, the more stable the towed barge becomes. (4) Whether the barge is equipped with skegs or not, the greater the course stability of barge itself, the more stable the towed barge becomes. (5) When the tow-line length is fixed, the more stable the barge is, the shorter the period of motion becomes. (6) It is generally believed, the greater the contribution of skegs to the stability is, the more the resistance increases. However, since the skegs tested cause no significant increase of resistance (less than 7%), the use of skegs should be valued in view of the course stability.
1978-08-15

被曳航BARGEの針路安定性に関する実験的研究

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