人工衛星の軌道上故障に関する二次分析

概要

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The author statistically analyzed on-orbit failure data of recent medium and large satellites based on primary investigations of satellite failures. Random parts failures are only 11% among failures whose causes are identified after investigations. Instead failures caused by design problems (57%) and manufacturing problems (32%) are dominant for on-orbit satellite failures. Propulsion and solar paddle subsystems have a relatively large number of failures caused by manufacturing problems, against which redundant system are partially effective. Mission instruments have a large number of failures caused by design problems. Bus subsystems except for propulsion and solar paddle subsystems have a relatively small number of failures. For these bus subsystems, failures tend to happen deterministically and redundant system may not be effective. Conventional reliability engineering based on the random parts failures seems not to be realistic in our space engineering.