Abstract: An abnormality diagnosis method is targeted at a hydraulic device which includes a hydraulic pump and a driven device driven by the hydraulic pump. The method includes calculating a frequency distribution with regard to a deviation between a normal value of an output parameter corresponding to an operation condition and an actual measurement value of the output parameter using a prediction model, and determining the presence of an abnormality if an average of the deviation exceeds a threshold. If the presence of the abnormality is determined, a factor of the abnormality is estimated based on the range of the deviation where a waveform peak of the frequency distribution exists.

Abstract: A facility condition monitoring device includes an abnormality-degree-calculation-model construction part which constructs an abnormality-degree-calculation model for calculating an abnormality degree of a monitoring feature group of a monitoring target facility, based on a normal feature group extracted from a state-quantity fluctuation data of the monitoring target facility, an abnormality degree calculation part which calculates the abnormality degree of the monitoring feature group with the abnormality-degree-calculation model, an abnormality determination part which determines whether the monitoring target facility is abnormal, based on the abnormality degree, an abnormality-contribution-rate calculation part which obtains a contribution rate of each feature constituting the monitoring feature group used for calculating the abnormality degree determined as abnormal by the abnormality determination part, and an abnormality cause identification part which identifies an abnormality cause of the monitoring t

Abstract: There is provided a hydraulic pump startup control device in a hydraulic system, which avoids an overloaded state at startup to enable low-temperature, fast startup and maintaining of the temperature with low-cost means in order to improve low-temperature startability. A bypass path 19 is placed in parallel with a hydraulic main line from a hydraulic tank, and the downstream of the bypass path is made merged with the hydraulic main line. A bypass valve 3 that opens or closes the bypass path is provided in the bypass path, and a pressure sensor is provided in the inlet of a hydraulic unit in the hydraulic main line. Further, a control device 10 to which a pressure detection value in the hydraulic main line is input from the pressure sensor to open the bypass valve based on the pressure detection value upon startup of the hydraulic unit.

Abstract: An object is to facilitate checking of functional normality of a pilot check valve. A wind turbine generator includes a pilot check valve for restricting a flow of hydraulic oil relative to each oil hydraulic cylinder for changing a pitch angle of each blade, and the pilot check valve functions for fixing the pitch angle of the blade to a feather position in a state in which rotation of the blade is stopped. The function of the pilot check valve may be hindered. The wind turbine generator detects an operation state of the blade during a process of changing the pitch angle of the blade from the feather position to a fine position, and compares the detected operation state of the blade to an operation state of the blade when the pilot check valve functions normally, to determine whether or not there is any abnormality in the pilot check valve.

Abstract: It is an object to provide a servo valve that can be manufactured at low cost by simplifying adjustment of the relative position between a nozzle and a flapper and simplifying the configuration of a valve-element driving circuit. Provided is a servo valve (1) including a spool (5) mounted so as to be movable back and forth; a first chamber (7) and a second chamber (9) that mutually push the spool (5) in opposite directions by means of fluid pressure; and a spool driving circuit (3) that supplies oil to the first chamber (7) and the second chamber (9) and that adjusts the pressure of supplied oil to move the spool (5) back and forth, wherein the spool driving circuit (3) maintains the fluid pressure of the first chamber (7) at a substantially constant level and includes, at an oil outlet of the second chamber (9), a nozzle flapper mechanism (27) that adjusts the fluid pressure of the second chamber (9).

Abstract: A lightning-strike detecting apparatus comprises: receptors (lightning members) that are provided at a plurality of locations on a wind turbine blade; lightning conductors that extend from these receptors to guide lightning-strike current to ground; a plurality of optical-fiber current sensors that are provided on the respective lightning conductors, detect lightning-strike current flowing in the lightning conductors, and output an optical signal; an optical signal converter that receives the individual optical signal output from these optical-fiber current sensors, converts the optical signals to the respective characteristic electrical signals, and outputs the electrical signals; and a controller that identifies the type of the electrical signal input from the optical signal converter, determines a lightning-strike spot on the basis of the type, and reports the lightning-strike spots.

Abstract: An object is to provide a cylinder driving device of a wind-power generation system capable of appropriately controlling a pitch angle of each rotor blade at a time of power failure with a simple configuration. The present invention achieves the object by including a piston connected to the rotor blade; a cylinder that moves the piston by a hydraulic pressure; an urging member that urges the piston in one direction; an accumulator that is connected to the cylinder, and supplies hydraulic oil urging the piston in an opposite direction to a direction where the piston is urged by the urging member to the cylinder; and an on/off valve that controls opening or closing of a channel between the accumulator and the cylinder.

Abstract: A wind-turbine-generator-system transmission and a wind turbine generator that can ensure the strength of a bearing and can also minimize seizing and abrasion are provided. In a wind-turbine-generator-system transmission having a sun gear, a planetary gear that meshes with the sun gear and rotates around the sun gear, and an inner tooth that meshes with the planetary gear, the transmission includes a carrier that rotates the planetary gear around the sun gear; a planetary pin that is disposed in the carrier and transmits rotation of the carrier to the planetary gear; a cylindrical sleeve disposed around a periphery of the planetary pin; and a slide bearing that is disposed between the sleeve and the planetary gear and supports the planetary gear in a rotatable manner about the planetary pin.

Abstract: In order to provide a lubricating device and lubricating method for a gearbox which does not take long to heat the lubricant oil and prevents the aeration of the lubricant oil due to the splashing thereof during the activation of the gearbox, the present invention provides a lubricating device for a gearbox comprising: a gearbox which includes an input shaft, a group of gears rotated by the rotation of the input shaft, and an output shaft rotated by the rotation of the group of gears, the rotation of the input shaft being speeded up and outputted to the output shaft via the group of gears; an oil storage chamber which stores lubricant oil for lubricating the gearbox; a lubricant oil circulating line which includes a pump and through which the lubricant oil stored in the oil storage chamber is supplied to the gearbox by the pump and then returned to the oil storage chamber; a bypass line which is provided in the oil lubricant circulating line and bypasses the gearbox; and a switching valve which is provided in

Abstract: A wind power generator is provided which is configured to take a measure against a decrease in oil temperature which measure requires no new large-capacity power source. A wind power generator including a hydraulic pump configured to be stopped when a wind turbine is shut down further includes a bypass channel branching off from an discharge side channel of the hydraulic pump and connected to an oil tank, an electromagnetic valve provided in the bypass channel and opened when the hydraulic pump is started, a temperature sensor configured to detect the oil temperature of hydraulic operating oil, and a controller configured to carry out pump inching after the hydraulic pump has been started, to raise the temperature of the hydraulic operating oil to a predetermined value.

Abstract: There is provided a hydraulic pump startup control device in a hydraulic system, which avoids an overloaded state at startup to enable low-temperature, fast startup and maintaining of the temperature with low-cost means in order to improve low-temperature startability. A bypass path 19 is placed in parallel with a hydraulic main line from a hydraulic tank, and the downstream of the bypass path is made merged with the hydraulic main line. A bypass valve 3 that opens or closes the bypass path is provided in the bypass path, and a pressure sensor is provided in the inlet of a hydraulic unit in the hydraulic main line. Further, a control device 10 to which a pressure detection value in the hydraulic main line is input from the pressure sensor to open the bypass valve based on the pressure detection value upon startup of the hydraulic unit.

Abstract: A low-temperature-fluid storage tank capable of efficiently increasing the pressure of fluid without heating the fluid is provided. There is provided a booster pump which includes a piston having a piston head and a piston rod and a cylinder having a compression chamber that accommodates the piston head so that a fluid is compressed by one end surface of the piston head. The piston head is provided with a bellows for separating a space adjacent to the piston rod from a space adjacent to the cylinder in the compression chamber.

Abstract: The present invention provides a sliding member which is a combination of sliding members to be operated in water-based environments and which has excellent wear resistance in water-based environments. An amorphous carbon film with a thickness of 0.1 to 5 ?m and a hardness of 7 to 25 GPa is formed on at least one of the sliding surfaces of the sliding part of the sliding member. In a preferred mode, a hydrogenated amorphous carbon film comprising 5 to 40 at % hydrogen is formed as the aforementioned amorphous carbon film so as to achieve greater wear resistance.

Abstract: The present invention provides a sliding member which is a combination of sliding members to be operated in water-based environments and which has excellent wear resistance in water-based environments. An amorphous carbon film with a thickness of 0.1 to 5 ?m and a hardness of 7 to 25 GPa is formed on at least one of the sliding surfaces of the sliding part of the sliding member. In a preferred mode, a hydrogenated amorphous carbon film comprising 5 to 40 at % hydrogen is formed as the aforementioned amorphous carbon film so as to achieve greater wear resistance.