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公开(公告)号：US20220341375A1
公开(公告)日：2022-10-27
申请号：US17753709
申请日：2021-02-02
Applicant: JAPAN AEROSPACE EXPLORATION AGENCY
Inventor： Kaname KAWATSU , Ai NOUMI , Naoki ISHIHAMA , Taiichi NAGATA
Abstract: Provided is a failure diagnostic system for a spacecraft liquid propulsion system that enables to accurately diagnose a failure in a spacecraft and a failure diagnostic method for the spacecraft liquid propulsion system. This spacecraft liquid propulsion system includes a plurality of thrusters, and a supply pipe connected to the thrusters. This system includes a pressure sensor that detects an inner pressure of the supply pipe as time-series data, a frequency spectrum conversion unit that converts the time-series data into data of a frequency spectrum, a storage unit that stores data of a frequency spectrum generated based on an analytical model by computer simulation or a test result of a testing device as a data set, a comparator that compares the data set with the data of the frequency spectrum generated by the frequency spectrum conversion unit, and a determining unit that determines a failure in any one of the plurality of thrusters according to a comparison result of the comparator.
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公开(公告)号：US20230408306A1
公开(公告)日：2023-12-21
申请号：US18333970
申请日：2023-06-13
Applicant: Japan Aerospace Exploration Agency
Inventor： Kohji TOMINAGA , Go FUJII , Taiichi NAGATA , Daichi WADA , Shinsaku HISADA , Kaname KAWATSU , Tokio KASAI
CPC classification number: G01D5/35367 , G01B11/165
Abstract: A sensor device that makes it possible to simultaneously measure a plurality of portions in a pipe while suppressing optical loss even when the diameter of the pipe is relatively small.
The sensor device includes an optical fiber in which a plurality of FBG sensors are formed and a detection unit that causes light to be incident on the optical fiber and detects reflected light from at least one of the plurality of FBG sensors. The portion of the optical fiber in which the plurality of FBG sensors are formed is wound around a pipe so as to form a winding angle which is a perpendicular or acute angle with an axis of the pipe in a side view of the pipe viewed from the portion of the optical fiber in which the FBG sensors are formed.-
公开(公告)号：US20240022189A1
公开(公告)日：2024-01-18
申请号：US18039463
申请日：2021-12-02
Inventor： Koshiro USUKU , Michio ISAYAMA , Akira MOCHIGI , Kenta NAGAHAMA , Tadashi MASUOKA , Kaname KAWATSU
CPC classification number: H02P9/008 , B64G1/646 , H02K7/1869 , B64G2004/005
Abstract: A power controller of a linear actuator 10 in a docking device 1 including a six-axis parallel link mechanism 5, wherein a motor driver 11 configured to control rotation speed of a motor M of the linear actuator 10 on the basis of a load produced on the link 4 includes a speed controlling unit 31 that outputs a current command, a current controlling unit 32 that converts the current command to a voltage command, and a current command limiter 33 that limits the current command of the speed controlling unit 31 so that power consumption per one linear actuator 10 is one sixth or less of the power supply capacity for the motor power, thus allowing for mounting the docking device 1 even for a spacecraft with a small power supply capacity, without requiring modification of the power supply capacity.
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公开(公告)号：US20210348985A1
公开(公告)日：2021-11-11
申请号：US17288602
申请日：2019-10-29
Applicant: Japan Aerospace Exploration Agency
Inventor： Kaname KAWATSU , Seiji TSUTSUMI , Miki HIRABAYASHI
Abstract: An abnormality diagnostic device includes a diagnoser configured to diagnose a type of abnormality that occurs in an abnormality diagnostic target on the basis of differences between abnormality simulation results for each type of abnormalities obtained by simulating a plurality of types of abnormalities in the abnormality diagnostic target and a plurality of time-series observation results obtained by observing the abnormality diagnostic target in time series using a plurality of detectors.
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