In order to actively develop marine resources for sustainable economic development, it is necessary to identify the types, distribution locations and reserves of seabed mineral resources. All seabed work is impossible without seabed sample exploration, whether it is a study of seabed geological structure or seabed resource exploration.
Ri Jong Chol, a researcher at the Faculty of Shipbuilding and Ocean Engineering, has designed a gravity corer with a spring release mechanism for re-identification of a seabed phosphorite distribution area, and determined the critical velocity before the free fall of the corer designed for sample seabed phosphorites at the depths of 1 000-2 000m.
He has found that the range of critical velocity increases with the increase in the mass of the corer and the decrease in the stiffness of the spring, and that it decreases with the length of a lever arm.
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