クレーンバージと吊荷の連成運動について : その2 斜波中の3次元応答
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概要
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Crane barges are indispensable work ships for various offshore operations such as construction, maintenance and others. These barges are generally exposed to severe sea conditions, their behavior in which, especially their response to waves, is of vital importance in view of their safety and workability. In predicting motion characteristics in waves of crane barges, it has not been practice to take into account the effect of the coupled motion between barge and hook load. The behavior of the whole dynamical system including a barge and a hook load is, however, quite different from that of barge or load without coupling effect. The author showed in the previous paper the importance of this coupled motion effect and disclosed some of its characteristics. The study, however, was on a simplified system consisting of purely 2-dimensional cylindrical barge in beam seas with a crane athwartship. In this 2nd report are disclosed results of a study on motion characteristics of an actual crane barge with a suspended load subjected to motion of 8-degree of freedom in regular waves. This study includes experiments in a model basin using a 1/50 scale model of the barge with the crane both abaft and athwart-ship, and theoretical calculation of the coupled motion wherein 3-dimensional source-sink method is employed for estimating hydrodynamic coefficients and wave-excited forces. From the study, it was found that calculation by linear theory can very accurately predict coupled motion of a crane barge and load, as was the case with the 2-dimensional calculation in the first report. The study also provides a few formula showing relationship between eigen frequencies of the coupled system and those of the uncoupled barge and load oscillation. Further, remarks are given of a few phenomena arising from strong asymmetry of weight distribution of crane barges in lifting operation.
- 社団法人日本船舶海洋工学会の論文
- 1983-03-03
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