A Survey of Guidance Requirements for Inertially Fixed Formation Flying
- Paper number
IAC-04-A.2.03
- Author
Mr. Benoït Fabre, Thales Alenia Space, France
- Year
2004
- Abstract
High reliability is required for the space systems because of its large-scale structure, long-term operation, maintenance-free condition and extraordinary environment. In the conventional reliability analyses, Failure Mode Effect and Criticality Analysis (FMECA), Fault Tree Analysis (FTA), Event Tree Analysis (ETA) and other miscellaneous methods have been adopted. In these methods, the relationships between the failures including malfunctions, anomalies, hazards and catastrophe, and its causes are evaluated in detail at each development phase. However, these methods cannot identify the mechanism of failures along time and the background of failures. It is necessary to evaluate the reliability throughout the project (conceptual design, detailed design, manufacturing including procurement, test, assembly, launch and practical operation on orbit).
Objectives of this study are to propose a new risk assessment method for reliability improvement where temporal updates of space system risk/reliability are taken into account, focusing on the following two points.
- Taking time-wise variation into account
We first clarify the chronology of failures. And a new risk assessment method that make possible to detect anomalies early, mitigate detrimental failures and prevent serious accidents in advance. - Making information common and sharing
information
Teams working in a large-scale project sometimes lack communication among them. With systematized documents and tools, all concerned could share information.
In this paper, a new risk assessment method for the reliability improvement?Time-tagged Risk/Reliability Assessment Program (hereinafter referred to “T-TRAP”) is described. In this program, time-evolutionally evaluation process is included and this process makes possible time-tagged analysis. We expand risk assessment for all phases of the development, including conceptual design, detailed design, manufacturing, test and practical operation. T-TRAP has not only the usual spacial axis including the system/subsystem/component/part interfaces, but also the temporal axis including the development phases of each items. In T-TRAP, by connecting the information (operational function, performance, design, anomaly in test, procurement, assembly, and another histories) of each document with its spacial axis and temporal axis, using configuration/information control processes, the systematized documents will be common for all managers and engineers, and the technical information and its communication will become better in the project, in every development phase, in any interface between system/subsystem/component level. Its sample of the T-TRAP applied to the propulsion subsystem will be presented.
- Taking time-wise variation into account
- Abstract document
- Manuscript document
IAC-04-A.2.03.pdf (🔒 authorized access only).
To get the manuscript, please contact IAF Secretariat.