衛星搭載用アンテナはね上げ機構の信頼性評価

抄録

A procedure is proposed to evaluate the reliability of antenna deployment mechanism (ADM) which is a key technology in large satellite antenna development. Because of lack in basic reliability data on space mechanical components, a realistic evaluation procedure needs careful selection of test items for cost and time saving. The Failure Mode and Effects Analysis (FMEA) is conducted to identify all possible failure modes, among which the critical modes are selected for further investigations. The bearing performance and friction are found to be critical, and detailed tests are performed. The test results show that the deployment and friction torque distributions can be assumed as normal distributions. The deployment reliability of the ADM was calculated based on these distributions. This paper also describes the method to prevent the failure derived from the reduction in bearing clearance.