バケットの海底での採取軌道について (2)

CLB法によるマンガン団塊採掘の研究 (第4報)

抄録

Authors had discussed the experimental results of the dredging paths of buckets on the Continuous Line Bucket (C. L. B.) mining system under the limited experimental conditions, that the rope circulation speed was faster than or the same as the ship speed, in the previous report in this journal (Vol.92, No.1055, 1976). The present report is concerned with the experimental results and the empirical equations which were obtained from further experiments and considerations under the experimental conditions that the rope circulation speed was slower than the ship speed together with the previous experimental conditions. The theoretical analysis of dredging paths are also discussed in this report.
The empirical equations are expressed on the basis of the ratio of ship speed to rope circulation speed and the ratio of height to base of a right-angled triangle which is simulated from the shape of both waiting and dredging lines. The theoretical analysis of dredging paths was performed on the basis of the initial dragged-out angle of a bucket and by using the equilibrium equations for the forces of the each linear element into which the main rope line was divided at bucket attaching points to the main rope line and whose length was the same as the bucket spacing.
Furthermore, some tests were conducted in the indoor test tank in order to obtain actual dredging paths under various experimental conditions. As a result, experimental values agreed with both calculated values obtained by the empirical equations and the theoretical equations as shown in Figure 17, in which solid lines indicated actual dredging paths of buckets and symbols o and x indicated co-ordinates of buckets obtained by the respective equations.