ボールねじ式波力発電装置の研究

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This report describes the results of digital simulations on practical units and wave-tank tests on small models of the Ball Screw Type Wave Power Generator (BSTWPG). There are two types of the BSTWPG, i.e. a fixed and a floating type. The fixed type, which is installed on the seashore, works by the forward momentum of the waves, and the floating type, which is mounted in a floating vessel, works by the motion of the vessel when it heaves on the waves. Each type of BSTWPG consists of a pressure plate and two power units, and the power unit of each type is composed of a ball screw and nut, a one-way clutch, a flywheel, a generator and a coil spring. The energy of the ocean wave which acts on the pressure plate is efficiently converted into the fairly smooth one-way rotations of the flywheels by the ball screws and the one-way clutches, and also converted into a fairly even flow of electric power by the generators. The equation of motion for the practical BSTWPG systems which use ball screws of outside diameter 250 mm and lead 32 mm were shown, according to the linear wave theory, and the digital simulations using Continuous System Simulation Language (CSSL) were developed. When the sea state is 7 sec wave at 1 m height, the available power per one BSTWPG is about 20 kW (efficiency was about 55%) for the fixed type and about 19 kW (efficiency was about 69%) for the floating type. The experimental model of the fixed type is composed of a rectangular pressure plate of 720 mm wide by 400 mm deep, two ball screws of shaft diameter 18 mm and lead 8 mm, two flywheels having an outside diameter of 198 mm and a moment of inertia of 2.29×10-<^3> kgf・s^2・m and two generators for bicycle use. The testing of the model was carried out in a wave-tank of 8.2 m long×0.8 m wide×1.6 m deept. When this model was subjected to 1.38 sec wave at 190 mm height, it had the peak output of about 14 W with the fluctuating ratio of 3.7%. In this case the efficiency was about 28%. The floating type model comprises two ball screws of shaft diameter 18 mm and lead 8 mm, two flywheels of outside diameter 198 mm and two generators for bicycle use. When this model was subjected to 1.6 sec wave at 190 mm height, it had the peak output of about 14 W with the fluctuating ratio of 2.3%. In this case the efficiency was about 33%.
明治大学の論文

ボールねじ式波力発電装置の研究

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