スマートアンテナにおけるアクチュエータ故障後の機能回復を考慮したレジリエント運用に対する信頼性評価

抄録

This research proposes the reliability analysis for the resilient operation of a smart antenna for radio astronomy mission considering the function recovery after failure of some actuators. The smart reflector system consists of a primary reflector and a deformable sub-reflector installed with actuators that adaptively adjust the surface shape of the sub-reflector to correct the adverse effect of the primary reflector distortion. The resilient operation proposed in the previous study aims to recover the function of the antenna system by using the survived actuators after failure of some actuators. It was found that the resilient operation succeeds in the function recovery in some cases but not in others. This study first proposes the operating rate to quantitatively evaluate the effect of the resilient operation that considers the observation condition and combinations of failed actuators. Then, the reliability analysis is formulated to consider the proposed operating rate and the failure probability of actuator. Through numerical examples, validity of the proposed method is demonstrated to quantify the reliability for the resilient operation of the smart reflector. Finally, the target failure rate of the actuators to satisfy the target reliability of the smart antenna is evaluated.