クレーンバージと吊荷の連成運動について

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In designing crane barges for use in offshore operations, their response to the environment, especially to waves, should be of primary concern. It has been rather rare, however, in predicting dynamic performance of a crane barge during lifting operations in waves, to take into account the effect of coupled motions between the barge and the load. Probably one of the main reasons for this is the fact that usually the load seems to be negligible in weight compared with the barge displacement, the ratio becoming still smaller if added inertia of the barge is involved. In reality, however, the counter-effects of the load oscillation on the barge motions, especially on rolling, are so great that the responses of the barge with and without coupling effects generate quite different curves even in the case where the load is of the order of 1〜2% of the displacement. In this paper are disclosed results of experiments and calculations conducted on two pontoon-type crane bages in beam seas with hook loads varying in weight and cable length for investigating the above-mentioned coupled motion effects. Some of the conclusions from the study are: (i) as mentioned above, hook loads which might be regarded insignificant in weight compared with barge displacement can greatly affect the barge motion characteristics; (ii) the natural frequencies of the barge rolling and load oscillation measured separately without the effect of each other's motion will not coincide with either of the frequencies of the pair of distinct peaks of each response discernible in coupled motions, and therefore, it may be insufficient for safe operation to try only to avoid resonance of these unccoupled oscillations with waves; (iii) calculations by a linear theory can predict very accurately the coupled motions of a barge-hook load system except, possibly, in the very narrow vicinity of the eigen frequencies of the system.
社団法人日本船舶海洋工学会の論文
1980-03-20

クレーンバージと吊荷の連成運動について

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