Abstract: This invention relates to a device and method for extracting energy from surface waves in a body of water, for example, the sea. A wave energy device (1) for extracting energy from surface waves in a body of water includes an elongate and flexible tubular body (2) having an outer wall (4) and within the outer wall a channel (6) that extends along the length of the tubular body (2). The device is positioned in a body of water so that, in use, the elongate body (2) extends along the water surface (15) in the direction of surface waves with water contained within the channel being driven to form a series of bulge waves that travel along the length of the channel as the tubular body flexibly follows the movement of the waves. The device harnesses energy from the bulge waves for providing useful power.

Abstract: This invention relates to a device and method for extracting energy from surface waves in a body of water, for example, the sea. A wave energy device (1) for extracting energy from surface waves in a body of water 10, comprises an elongate and flexible tubular body (2) having an outer wall (4) and within the outer wall a channel (6) that extends along the length of the tubular body (2). The device also comprises means for positioning the tubular body in a body of water so that, in use, the elongate body (2) extends along the water surface (15) in the direction of surface waves with water contained within the channel being driven to form a series of bulge waves that travel along the length of the channel as the tubular body flexibly follows the movement of the waves. The device further comprises energy harnessing means (40) for providing useful power. The tubular body (2) has within the outer wall (4) a plurality of deformable chambers (16) that are provided along length of the tubular body.

Abstract: A generally horizontal distensible tube (1) in the sea containing fluid and oriented in the direction of wave travel, the distensibility being chosen so that the propagation velocity of pressure waves inside the tube (bulge waves) is the same as the velocity of propagation of the waves in the sea. Energy is then transferred from the ocean waves to the bulge wave. Energy extraction means (84, 85) at the stern and/or bow convert the bulge power to useful energy. Said energy extraction means may comprise pistons actuating pumps or linear or rotating generators, or one-way valves allowing the bulge wave to pump fluid via hydraulic accumulators through a turbine. The walls of the distensible tube (1) may be comprised partly of elastomer (86) and partly of inelastic flexible polymer coated fabric (87).

Abstract: A generally horizontal distensible tube (1) in the sea containing fluid and oriented in the direction of wave travel, the distensibility being chosen so that the propagation velocity of pressure waves inside the tube (bulge waves) is the same as the velocity of propagation of the waves in the sea. Energy is then transferred from the ocean waves to the bulge wave. Energy extraction means (84, 85) at the stem and/or bow convert the bulge power to useful energy. Said energy extraction means may comprise pistons actuating pumps or linear or rotating generators, or one-way valves allowing the bulge wave to pump fluid via hydraulic accumulators through a turbine. The walls of the distensible tube (1) may be comprised partly of elastomer (86) and partly of inelastic flexible polymer coated fabric (87).