Complex ground diagnostic system for spacecraft electromechanical devices

Abstract

One of the ways to make spacecraft electromechanical devices much reliable is the diagnostics of their technical condition during ground tests and identification of possible defects. Authors have viewed questions of spacecraft electromechanical devices’ diagnostics. There is an overview of the state-of-the-art applied diagnostic methods with the proposed complex diagnostic method, including, apart from vibration-based diagnostics, methods of the analysis of the vector module and vector hodograph of the electric engine’s equivalent current. Authors presented spectral characteristics of vibration acceleration signals and equivalent current, as well as hodographs. They also identified generic criteria for current diagnostics. The narration includes the description and function circuit of the ground complex diagnostic system for the engine of the electric pump unit (EPU) at the spacecraft thermal control system. It also includes the software interface for the system.