Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Yoshikatsu Ikawa

Takahiro Nakano

Kazunari Ide

Takaharu Hiroe

Ryo Sase

Hiroyuki Endo

Akira Yasugi

Tsuyoshi Wakasa

Masayuki Hashimoto

Mitsuya Baba

Ko Takayanagi

Kentaro Hayashi

Takao Kuroiwa

Atsushi Yuge

Kai Karikomi

Hisanobu Shinoda

Takehiro Naka

Katsuhiko Takita

Masato Mitsuhashi

Takuya Koyanagi

Toshio Ishiwaki

Tomohiro Doi

Hiroshi Kitayama

Eriko Shinkawa

An abnormality detecting apparatus that is configured to detect a presence or absence of an abnormality in a rotating machine includes a processor that is configured to execute a measured value acquisition process of acquiring, on the basis of a detection signal output from a vibration sensor that is configured to measure vibration caused by rotation of the rotating machine, a measured value including an amplitude and a phase of the vibration; a Mahalanobis distance calculation process of calculating a Mahalanobis distance of the measured value acquired at a time point at which the rotating machine is evaluated on the basis of a unit space configured with a plurality of measured values acquired at a plurality of past time points; and a determination process of determining that an abnormality has occurred in the rotating machine in a case where the calculated Mahalanobis distance exceeds a predetermined threshold value.

Abnormality detecting apparatus, rotating machine, abnormality detection method, and non- transitory computer readable medium

A control device () of a plant which controls operation amounts of a plurality of types of equipment constituting the plant, the control device includes a prediction model deriving unit () that derives a prediction model from which a monitoring target value is output, an adjustment amount calculating unit () that calculates adjustment amounts of operation amounts in the case where the monitoring target value becomes a desired value and calculates differences between the operation amounts of existing control and the calculated operation amounts as first adjustment amounts, a constraint condition setting unit () that sets constraint conditions based on a measurement value and operation conditions of the plant, and an operation amount calculating unit () that calculates second adjustment amounts to which the constraint conditions are applied and calculates a plurality of the adjusted operation amounts based on each of the calculated second adjustment amounts.

Control device, control method and computer readable medium for controlling plant based on prediction model and constraint condition

An abnormality detection device includes a processor and a storage unit connected to the processor. The processor is configured to execute an error vector acquisition process of acquiring an error vector representing a difference between a measurement value vector having multiple measurement values measured at a determination time as elements and an average value vector having an average value of the measurement values accumulated in the storage unit as an element, a component acquisition process of acquiring a plurality of components into which the error vector is decomposed with respect to a direction of a singular vector, a comparing process of comparing a value obtained by squaring each of the components into which the error vector is decomposed with respect to the direction of the singular vector with corresponding variance in the direction of the singular vector individually with respect to the direction of the singular vector, and a determination process of performing an abnormality determination on the basis of plural compared results in the comparing process.

Abnormality detection device, abnormality detection method, and program

A method of detecting a damage of a wind turbine blade of a wind turbine rotor includes: a light input step of inputting light into a fiber-optic sensor mounted to the wind turbine blade; a light detection step of detecting reflection light from the grating portion; an obtaining step of obtaining a wavelength fluctuation index representing a fluctuation amount of a wavelength of the reflection light detected in the light detection step; and a detection step. The detection step includes detecting the presence or the absence of the damage of the wind turbine blade based on the wavelength fluctuation index taking account of a correlation between the wavelength fluctuation index of the wind turbine blade and a load index related to a load applied to the wind turbine blade, or a correlation between the wavelength fluctuation index and a temperature index related to a temperature of the wind turbine blade.

Method of detecting damage of wind turbine blade, and wind turbine

An exhaust gas purification system includes a feedforward controller, a feedback controlleroutputting a correcting variable for achieving a target temperature of DPF, and a variable adding unitthat adds the correcting variable output from the feedback controllerto a basic variable output from the feedforward controllerto compute a manipulated variable. The system further includes either one of an integrator resetterthat resets the integral value of an integrator that forms the feedback controllerwhen the amount of exhaust gas has suddenly dropped, and a basic variable calculating unit that calculates the basic variable to be output from the feedforward controller based on a signal representing the flow rate of exhaust gas.

Exhaust gas purification system for internal combustion engine

A DPF target temperature setting unit has a temperature increase rate setting portion which sets a temperature increase change rate such that, until a target set temperature at which PM is burnt is reached after the start of late post injection, the temperature increase change rate is reduced in accordance with an increase in temperature or a period of time elapsed since the start of the late post injection, a stepwise temperature increase change rate in the temperature increase rate setting portion includes two stages of a first-stage change rate A and a second-stage change rate B lower than the first-stage change rate, and a target temperature of the DPF temperature is calculated by using the temperature increase rate of the temperature increase rate setting portion.

Exhaust emission control device of diesel engine

Providing a PM emission amount estimation device for the diesel engine wherein the accuracy of the correction in correcting the basic level of the PM emission amount by use of the PM emission amount estimation map can be enhanced; and, the PM emission amount particularly during the transient state of the engine operation condition can be accurately computed so as to estimate, with high precision, the PM emission amount and the PM emission accumulated-amount (integrated amount) during the whole engine operation conditions including the transient state as well as the steady state. A PM emission amount estimation device for estimating the amount of the PM for estimating the amount of the PM that is emitted from a diesel engine and collected by a DPF provided in the exhaust gas passage of the engine, the device including, but not limited to: a PM emission amount estimation base-mapwith which the base PM emission amount is computed in response to the operation condition of the engine; a PM emission amount estimation correction-mapthat determines a correction factor for correcting the base PM emission amount computed by the PM emission amount estimation base-map, the correction factor being determined in response to the transient engine operation condition; a transient state judgment devicethat judges that the engine is operated in a transient operation condition based on the change of the air excess ratio regarding the engine; a PM emission amount computation devicethat corrects the computed base PM emission amount by multiplying the computed base PM emission amount by the correction factor computed with the PM emission amount estimation correction-maponly in a case where it is judged, by the transient state judgment device, that the engine is in a transient operation condition whereas the base PM emission amount is directly outputted in a case where it is judged that the engine is in a steady operation condition.

PM emission amount estimation device for diesel engine

A turbine controller of a wind turbine generator includes a generated-output-power command value creating section that creates a generated-output-power command value and an optimum-upper-and-lower-limit limiting section that limits the generated-output-power command value by means of an upper limit value and a lower limit value of the generated output power that are determined based on a power curve indicating the relationship between the generated output power and the rotational speed of the generator. Furthermore, the turbine controller includes a limit-value creating section that creates, when the grid frequency is increased above a predetermined reference frequency, a frequency-dependent limit value serving as an upper limit value of the generated-output-power command value, according to the increase in grid frequency; and a first upper-limit limiting section that limits the upper limit value of the generated-output-power command value limited by the optimum-upper-and-lower-limit limiting section, by means of the frequency-dependent limit value.

Wind-turbine-generator control system, wind turbine generator, wind farm, and wind-turbine-generator control method

Growing community of inventors

Tokyo, Japan

Yoshikatsu Ikawa