Ihi Corporation

Japan Aerospace Exploration Agency

Ihi Aerospace Co., Ltd.

Hatsuo Mori

Kohei Taya

Takayuki Yamamoto

Yasuhiro Ishikawa

Takashi Ogai

Taku Izumiyama

Kozue Hashimoto

Tsuyoshi Yagishita

Noriyoshi Mizukoshi

Keisuke Suzuki

Masanori Suzuki

Shinji Ishihara

Masahiro Tanaka

Kenji Hirai

Toru Nagao

Yusuke Maru

Satomi Kawamoto

Satoshi Nonaka

Tomoharu Oda

Keiichi Hirako

Shinsuke Takeuchi

Hiroyuki Sakaguchi

Yu Hirata

Yoshihiro Naruo

Shinichiro Tokudome

Takeshi Takaki

Yoshifumi Inatani

Hirotaka Kure

Koichi Miyoshi

Taiichi Motomura

The combustor for a rocket engine includes a combustion room configured to cause a combustion reaction between a fuel and an oxidant, an injector configured to inject the fuel and the oxidant into the combustion room, and a nozzle skirt configured to inject combustion gas generated by the combustion reaction to an outside, and an inertance increasing portion configured to increase an equivalent inertance in a vibration equivalent circuit of the combustor for the rocket engine.

Combustor for rocket engine

An abnormality determination device according to one aspect of the present disclosure is an abnormality determination device that determines an abnormality of an inducer used for a pump, the abnormality determination device including a stress-response acquisition unit that acquires a stress response indicating a temporal change in stress applied to the inducer, an accumulated-fatigue-damage-degree calculation unit that calculates an accumulated fatigue-damage degree of the inducer based on the stress response, a lifetime-consumption-rate calculation unit that calculates a lifetime consumption rate that is a changing rate of the accumulated fatigue-damage degree with respect to time, and a determination unit that determines an abnormality of the inducer based on the accumulated fatigue-damage degree and the lifetime consumption rate, in which the inducer is used only for a predetermined use time per operation of the pump.

Abnormality determination device and abnormality determination method

A low-temperature tank includes a container main body. The container main body includes a metal liner forming a storage space and a wall member formed of carbon fiber reinforced plastic wound on an outer peripheral surface of the metal liner. The metal liner includes a bent portion that extends in two directions intersecting each other on a surface thereof and that is bent to project toward the storage space.

Low-temperature tank and method for manufacturing same

A pneumatically-actuated valve is provided in which a spring member that applies an axial force to a shaft connected to a valve body, in an axial direction of the shaft, and a valve-actuating pressure chamber that actuates the valve body by applying a force resisting the axial force to the shaft are provided inside a valve casing. The pneumatically-actuated valve includes an axial-force adjusting device that adjusts the magnitude of energy stored in the spring member, via a surface-pressure adjusting screw provided to be inserted through the valve casing, from the outside of the valve casing.

Pneumatically-actuated valve

A valve actuator is a valve actuator that drives opening and closing of a poppet valve and includes a motor and a transmission mechanism that transmits a drive force of the motor to the poppet valve. The transmission mechanism includes a booster mechanism. The booster mechanism is a three-dimensional toggle mechanism that includes a cylinder, an input disc that rotates about an axis in the cylinder, an output disc that reciprocates along an axial direction in the cylinder, and a link that connects the input disc and the output disc.

Valve actuator for an electrically actuated poppet valve including a continuously variable transmission and a power free latching mechanism

An abnormality diagnosing method includes a model generation step of generating a simulation model of a monitoring target, an operation start step of starting an operation of the monitoring target, a measurement step of measuring an internal state quantity in the operating state of the monitoring target and extracting a measured value, a prediction step of inputting into the simulation model same control input value used in the operating state of the monitoring target and calculating a predicted value of the internal state quantity of the monitoring target, a Mahalanobis distance calculation step of calculating a Mahalanobis distance from a difference between the measured value and the predicted value, and an abnormality diagnosis step of diagnosing whether the operating state of the monitoring target is abnormal based on the Mahalanobis distance.

Abnormality diagnosing method and abnormality diagnosing system

A debris removal device includes: an end mass adapted to approach debris to be removed; a debris capture device separably-mounted on the end mass; and a tether connecting the debris capture device and the end mass to each other. The debris capture device includes a harpoon adapted to penetrate into the debris, a shooting device adapted to shoot the harpoon, a guide member positioned to come into contact with the surface of the debris to adjust the shooting angle of the harpoon with respect to the surface of the debris, and a switch that sends the shooting signal to the shooting device. When the harpoon is penetrated into the debris, the end mass is separated from the debris capture device, and the tether is released into outer space.

Debris removal device and debris removal method

Provided is a pneumatic valve in which a seal member; a shaft provided with a valve body capable of abutting against the seal member; and a valve-actuating pressure chamber that moves the shaft in an axial direction to actuate the valve body is provided within a valve casing. The shaft has a first member that receives pressure from the valve-actuating pressure chamber, and a second member that includes the valve body and is movable relative to the first member in the axial direction. The pneumatic valve further has a stopper that is provided in a movement path of the first member, and a disc spring that is sandwiched between the first member and the second member, has elastic energy accumulated therein in a state where the first member is in contact with the stopper, and presses the valve body against the seal member.

Pneumatic valve

Provided is a vapor jetting device including: a box-shaped casing; a propellant holding unit that is placed in the casing and forms a space for holding a propellant; a gas storing unit that is placed in the casing, forms a space that is divided from the propellant holding unit by a partition wall including a communication hole, and stores gas; a machine housing unit that is placed in the casing, forms a space that is divided from the propellant holding unit and the gas storing unit by partition walls, and houses machines; a nozzle that is connected to the casing and ejects the gas to an outside; a gas flow path that is formed in the casing and supplies the gas stored in the gas storing unit to the nozzle; and a heater that is placed in the casing and heats at least the gas storing unit.

Vapor jetting device and spacecraft

Disclosed is a turbo pump in which a pump impeller is connected to one end of a rotary shaft and a turbine is connected to the other end of the rotary shaft. The turbo pump is designed such that an equivalent region, between a turbine efficiency curve obtained on the basis of a conditional expression where the number of rotations of the rotary shaft is maintained constant regardless of a pump flow rate and a turbine efficiency curve of an actual machine, becomes an operation region.

Rocket engine system for realizing high-speed response

The invention relates to a product design support system for supporting product design business so as to design and develop a product in a short time. The system creates an L-row orthogonal table according to set design parameters, executes many times, for each of L sets of design parameter groups, a virtual prototyping operation by adjusting the dimensional tolerance of each part, processes averages and variances of L sets of evaluation indexes obtained by the virtual prototyping operations, to form a response surface and response surface model, makes a factorial effect diagram of design parameters for each evaluation index, examines the factorial effect diagram, forms optional combinations of design parameters sensitive to the evaluation indexes, applies the combinations to the response surface model, forms many design solutions by optionally combining all design parameters that may achieve design target values, conducts filtering to extract a maximum likelihood design solution candidate group that achieves specified evaluation index limit values out of the design solutions, selects a maximum likelihood design solution group from the solution candidate group, and presents the same to a user.

Product design support system and method for simulating a prototype of a design object

Growing community of inventors

Tokyo, Japan

Hatsuo Mori