Japan Aerospace Exploration Agency

Kaname Kawatsu

Taiichi Nagata

Naoki Ishihama

Ai Noumi

A failure diagnostic system for a spacecraft liquid propulsion system having a plurality of thrusters and a supply pipe connected to the thrusters, is used to diagnose a failure in the spacecraft. The 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 frequency spectrum data, a storage unit that stores the frequency spectrum data 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 frequency spectrum data, and a determining unit that determines a failure in any one of the plurality of thrusters based on the comparison.

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Tokyo, Japan

Kaname Kawatsu