A hydraulic machine has a runner, a guide apparatus, a draft tube, and an apparatus for measuring the water level in the region of the draft tube. The apparatus includes a first pressure measuring device, a second pressure measuring device, and a unit for generating differential pressure values. The pressure measuring devices are arranged in such a way that they may detect the pressures applied inside the draft tube and are respectively connected to the unit. The first pressure measuring device is located above the second pressure measuring device, and the unit is configured to generate the difference between the pressures that the pressure measuring devices detect. There is also described a method for dewatering the runner of such a hydraulic machine.

The rotating machine, comprises a shaft and at least one device for measuring at least the accelerations of the shaft along pitch, yaw and roll axes of the shaft or the angular position of the shaft around the pitch, yaw and roll axes, the or each device being mounted on the shaft.

A gentle start-up device includes: a rotational type hollow pipe body, including an inlet and an outlet, and having an inner wall provided with a plurality of bar-shaped fins; a transmission unit, physically connected to the rotational type hollow pipe body; and a driving unit, physically connected to the transmission unit for driving the transmission unit to rotate the rotational type hollow pipe body in a rotational direction and to achieve a predetermined rotational speed according to a water supply flow value of a water turbine of a hydraulic generator set, whereby water flow which passes through the rotational type hollow pipe body generates rotational flow.

The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

A computer-implemented method of controlling a power take-off (PTO) of an energy converter apparatus having at least one body which receives energy from their environment and whose energy is absorbed by said PTO is described. The method involves: (a) receiving an input describing the motion of the at least one body making up the apparatus; (b) predicting the excitation force F.sub.ex which will be incident on the body over a prediction horizon H.sub.p, by approximating said excitation force using generalised truncated half-range Chebyshev-Fourier (HRCF) basis functions; (c) solving an optimal control problem, defined in terms of optimising a cost function J representing the energy absorbed by the PTO over the prediction horizon H.sub.p, using a HRCF pseudo spectral optimal control wherein the state and control variables are approximated by their truncated half-range Chebyshev Fourier series to generate an optimal reference trajectory; (d) providing as an output to said PTO a control signal adapted to cause the PTO to approximate said optimal reference trajectory; and (e) repeating steps (a) to (d) after a calculation interval Tc where Tc<Hp.

The invention relates to the real-time determination of the forces applied by waves incident upon the moving part (2) of a wave-energy system (1). The method according to the invention is based on the construction of a model of the radiation force applied to the moving part (2) and a model of the dynamics of the wave-energy system (1). The invention uses only measurements of the kinematics of the moving part (2) and the force applied by the conversion machine (3) to the moving part (2).

Methods and apparatus to test a generator of a hydrokinetic turbine are disclosed herein. An example method includes positioning a rim generator of a hydrokinetic turbine assembly on a testing apparatus prior to assembling the rim generator with the hydrokinetic turbine; orienting a rotational axis of the rim generator substantially vertically; and measuring a first output performance of the rim generator.

The present invention belongs to the technical field of ocean energy utilization, and provides a test system for turbine comprehensive performance of a pneumatic wave energy converter. The test system for turbine comprehensive performance of the pneumatic wave energy converter comprises a wave surface simulation system, an airflow rectifier system, a turbine device, a tabletop support structure, an instrument support frame and a sensor analysis system. A programmable linear motor is used to drive a bellows to simulate the complex oscillating airflow of the pneumatic wave energy converter; a complete sensor and measurement system is configured for various performance indexes of a turbine system; and finally, an effective technical evaluation means for the power generation efficiency and comprehensive performance evaluation of the pneumatic wave energy converter is provided. The present invention has simple assembly and disassembly technologies and high flexibility.

A hydroelectric power generation apparatus includes a braking force generation unit configured to apply a braking force to rotation of a hydraulic turbine, and a controller configured to control the braking force generation unit to repeat increasing and decreasing the braking force to vary a rotational speed of the hydraulic turbine. Varying the rotational speed of the hydraulic turbine helps to flow away debris and the like adhering to hydraulic turbine blades. Preferably, the braking force generation unit includes an electrical, mechanical or fluid type braking device configured to apply a braking force to a rotary shaft of the hydraulic turbine. Preferably, the braking force generation unit includes a power generator configured to generate power through rotation of the hydraulic turbine, and the controller increases/decreases the braking force by varying power extracted from the power generator.

A wear diagnosis system and method for a floating tile of an oil receiver based on industrial Internet are provided and includes the following. The plurality of vibration sensors are installed on the oil receiver of a hydroturbine, the vibration sensors are configured for collecting vibration data of the oil receiver. The plurality of swing sensors are installed on the oil receiver of the hydroturbine, and the swing sensors are configured for collecting swing data of the oil receiver. The monitoring subsystem is configured for collecting start-stop information of an oil pump of an oil collecting device of the hydroturbine, an oil level of a hub high-level oil tank and unit load information. The test result collection subsystem is configured for collecting oiling test results of each oil tank of the hydroturbine. The diagnosis subsystem is configured to diagnose whether the floating tile of the oil receiver is worn.