Dynamic Behavior of a Submarine Cable in a Uniform Sea Flow

概要

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The dynamic behavior of a submarine cable towed in a uniform sea flow was studied through a 1 km cable towing oceanic experiment. The cable form was obtained by using depth data from seven sensor units fixed in the cable at 100 meter intervals, and the straight distances between two supersonic transmitters fixed to both sides of the ship and seven supersonic receivers in the same sensor units. Cable vibration was measured with a 3-axial accelerometer fixed in the cable 150 meters from the cable end. As the result of the experiment, it was clarified that the submarine cable vibrated owing to a vortex-excited oscillation phenomenon, and that the drag coefficient C_d for the cable was about 1.30〜1.66,which was larger than the C_d (=1.2) for an infinite-length steady circular cylinder normal to a uniform flow.
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