A machine and process to compress ambient air using natural swell of ocean waves to store energy. The devise is a bi-directional air pump operated by ocean wave power of water buoyancy as well as earth gravity in a pressure vessel using a piston. The machine uses a large surface area as float connected by a rod to a small area as piston, housed in a pressure vessel to multiply compression of air. The compression of air is directly proportional to the respective surface areas of float to the piston attached with a rod inside the pressure vessel. An array of similar machines can be employed to multiply potential energy output.

One embodiment provides a system for facilitating fault diagnosis. During operation, the system collects current signals associated with a physical object which comprises a rotating machine. The system demodulates the collected signals to obtain current envelope signals, which eliminates fundamental frequencies and retains fault-related frequencies. The system resamples the current envelope signals, which converts the fault-related frequencies to constant frequency components. The system enlarges, by a fault-amplifying convolution layer, the resampled envelope signals to obtain fault information. The system provides the fault information as input to a deep convolutional neural network (CNN). The system generates, by the deep CNN, an output which comprises the fault diagnosis for the physical object.

By receiving a leading wave in a state where a wave receiving box is sunk on the coast, a pressure return pipe and a pressure return on-off valve are controlled, and a water surface in an air compression pipe is set to a reference water surface lower than an air throttle, even when there are tide level fluctuations and wave size variations in one wave receiving box, energy of the wave is converted into compressed air without loss, is stored in a compressed air storage tank, and can be used for power generation or the like.

A blade pitch controller for a wind turbine includes a nominal control system and a tower feedback loop. The tower feedback loop includes a filtering system. The filtering system is arranged to control wind turbine blade pitch so as to provide additional effective stiffness to the wind turbine in response to motion of the wind turbine which is above a filter frequency of the filtering system.

A wave power generation apparatus is disclosed. A wave power generation apparatus according to one embodiment can comprise: a floating body floating on the surface of the sea; a power transmission part, which is connected to the floating body so as to receive power generated according to the movement of the floating body, and moors the floating body on the surface of the sea; and a mooring angle adjustment module for adjusting the mooring angle of the floating body for the power transmission part according to the state of the waves acting on the floating body.

Provided is a method, computing system, and computer program product for reducing floating wind turbine loads induced by ocean waves by adjusting a blade pitch angle of at least one rotor blade of a floating wind turbine to minimize a moment imbalance at a platform top of the floating wind turbine caused by ocean wave activity.

An adjustable multi-functional bottom-hinged flap-type wave energy utilization device includes at least three wave energy conversion devices arranged in parallel and with adjustable spacing. Each wave energy conversion device includes a wave energy conversion component, a direction adjustment component for adjusting a wave-facing direction of the wave energy conversion component, and a height adjustment component for adjusting a height of the wave energy conversion component. The wave energy conversion component includes a mounting base plate, a transmission shaft arranged on the mounting base plate, a wave energy flap that can drive the transmission shaft to rotate, a generator connected to the transmission shaft, a hydraulic oil cylinder positioned on a back surface of the flap for pushing the flap to reset, and a wave monitor arranged on the mounting base plate for monitoring a draught and a wave direction angle of the flap.

Provided is a control system for operating a floating wind turbine under sea ice conditions. The control system includes a detection device configured for detecting a formation of ice in a critical zone around the floating wind turbine, and an ice inhibiting device configured for manipulating the floating wind turbine in such a manner that the critical zone is free of a threshold amount of the detected formation of ice. Furthermore, a floating wind turbine is provided which includes a wind rotor including a wind rotor including a blade, a tower, a floating foundation, and an above-described control system. Additionally, a method for operating a floating wind turbine under sea ice conditions is provided.

By receiving a leading wave in a state where a wave receiving box is sunk on the coast, a pressure return pipe and a pressure return on-off valve are controlled, and a water surface in an air compression pipe is set to a reference water surface lower than an air throttle, even when there are tide level fluctuations and wave size variations in one wave receiving box, energy of the wave is converted into compressed air without loss, is stored in a compressed air storage tank, and can be used for power generation or the like.

The present invention relates to a rotor control system for actuating pitch of pitch adjustable rotor blades of a wind turbine in order to reduce edgewise blade vibrations. The system comprises a pitch actuation unit being arranged to receive an edgewise load signal and apply m-blade coordinate transformations, such as the Coleman transformations, to the edgewise load signal. Based on a selected signal component at either a backward whirling frequency or a forward whirling frequency, a modified modification signal is obtained.