A hydrokinetic energy based power generation system is described, including several modules filled with fluid or vacuum and anchored to a stream bed of water body, multiple basic units associated with each module for converting hydrokinetic energy into electrical energy, wherein each basic unit includes two springs affixed with a top and bottom portion of the modules in such a way that the hydrokinetic energy induces vibrations within the springs, a cylindrical tube positioned between the springs, and contained with a ferromagnetic fluid, two fixed magnets and a movable magnet, wherein the movable magnet oscillates in between the fixed magnets due to the induced disturbances caused by waves/ocean and repulsive forces caused by the fixed magnets, an electric coil associated with the tube, for generating electric current by harnessing the relative motion of the movable magnet and electric coil due to electromagnetism phenomenon and in accordance with laws of electromagnetic induction.

A method for harvesting energy from a train passing over a railroad rail. The method including transferring a deflection of the rail from the train to a mechanical energy storage device; storing mechanical energy provided by the transfer mechanism until a predetermined amount of mechanical energy is stored; transferring the stored mechanical energy to a generator upon the stored mechanical energy reaching the predetermined amount; and converting the transferred mechanical energy to electrical energy.

A linear compressor includes: a shell; a cylinder provided inside the shell; a frame coupled to an outer side of the cylinder; a piston configured to reciprocate in an axial direction; a motor that supplies power to the piston; and a spring mechanism coupled to the piston. The spring mechanism includes: a support connected to the piston and including a spring support unit having one or more insertion holes; a first coupling protrusion that extends from the rear side of the spring support unit along the edge of the insertion hole; a support cap inserted into the insertion hole and including a second coupling protrusion protruding from the front side of the spring support unit; a first resonant spring inserted into the outer circumferential surface of the second coupling protrusion; and a second resonant spring inserted into the outer circumferential surface of the first coupling protrusion.

Disclosed are a wave force generation system for producing electric energy by a hydraulic circuit and a controlling method. The wave force generation system comprises a power conversion portion including a hydraulic cylinder which generates a hydraulic pressure by six degrees-of-freedom motion of a moving object floating on waves, wherein: when force is applied to the hydraulic cylinder in one direction thereof, the power conversion portion makes a fluid flow along a first path so as to produce electric energy; and when force is applied to the hydraulic cylinder in the other direction thereof, the power conversion portion makes the fluid flow through second path which makes the fluid bypass and flow in a direction opposite to the first path, whereby the fluid in the second path meets the first path and thus can produce electric energy.

A gas ejection apparatus includes: a cylinder having a rotating member that rotates within the cylinder; a motor coupled to the rotating member of the cylinder and that causes gas to be compressed inside the cylinder and to be ejected from the cylinder by causing rotation of the rotating member; a control circuit board that controls the motor; and a case in which the cylinder, the motor and the control circuit board are disposed. The case extends in a planar direction and has side surfaces that are orthogonal to the planar direction. The motor and the cylinder are arranged adjacent to each other in the planar direction of the case. The control circuit board is disposed adjacent to and substantially parallel to one of the side surfaces of the case.

A rotor blade for a wind turbine having an aerodynamic profile which extends from a blade root up to a blade tip and has a leading edge and a trailing edge. An adjustable aerodynamic flap, which can be adjusted between a retracted and a deployed position by means of a flap drive, is provided on the rotor blade. The flap drive comprises a passive control system which controls a flap position depending on rotation speed. The passive control system of the flap drive is low-maintenance and does not interfere with the safety concept of a wind turbine. In comparison with a reference rotor blade without a flap, the rotor blade has increased lift at low wind speeds.

A wave energy capture device, including a wave chamber arranged to engage a body of water including a plurality of waves, including a floor having a front end and a rear end, a first opening arranged proximate the front end, a second opening arranged proximate the rear end, and a hose arranged on said floor and extending from the first opening to the second opening, the hose operatively arranged to fill with water from the body of water, and a cylinder arranged on the floor proximate the front end, the cylinder connected to the wave chamber via one or more springs, wherein, when one of the plurality of waves enters the first opening, the cylinder is displaced along the floor from the front end toward the rear end, and expresses the water in the hose in a first direction from the front end toward the rear end.

A rotor blade assembly for a wind turbine may include a first blade segment having a first joint end and a second blade segment having a second joint end, with the blade segments being coupled together such that the first and second joint ends are located at or adjacent to a joint interface between the blade segments. The blade assembly may also include a pre-loaded beam extending outwardly from the second blade segment across the joint interface such that the pre-loaded beam is received within the first blade segment. The pre-loaded beam may be compressed between the opposed internal structural components of the first blade segment such that a first engagement interface is defined between a first side of the pre-loaded beam and the first internal structural component and a second engagement interface is defined between an opposed second side of the pre-loaded beam and the second internal structural component.

A yaw system for a wind turbine can have a yaw bearing with an outer bearing ring, an inner bearing ring, and a plurality of yaw rollers rotationally disposed between the outer and inner bearing rings so as to allow relative motion between the outer and inner bearing rings. A bi-directional braking assembly having an outer clutch ring attached to the outer bearing ring, an inner clutch ring attached to the inner bearing ring, and a plurality of brake rollers rotationally and slidably disposed between the inner clutch ring and at least one locking ramp adjacent the outer clutch ring. A plurality of spring members can extend from either ring projections or activation projections to each brake roller. An activation ring can slidably position the plurality of brake rollers into one of a locked position or unlocked position to prevent yaw rotation in an undesired direction.

A wave energy capture device, including a wave chamber arranged to engage a body of water including a plurality of waves, including a floor having a front end and a rear end, a first opening arranged proximate the front end, a second opening arranged proximate the rear end, and a hose arranged on said floor and extending from the first opening to the second opening, the hose operatively arranged to fill with water from the body of water, and a cylinder arranged on the floor proximate the front end, the cylinder connected to the wave chamber via one or more springs, wherein, when one of the plurality of waves enters the first opening, the cylinder is displaced along the floor from the front end toward the rear end, and expresses the water in the hose in a first direction from the front end toward the rear end.