Reliability Estimating Procedures for Electric and Thermochemical Propulsion Systems. Volume 1
Final rept. Mar 1975-Dec 1976
BOOZ-ALLEN APPLIED RESEARCH BETHESDA MD
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The primary objective of this study was to develop a sound standardized basis for reliability comparisons of thermochemical and electric propulsion concepts applicable to Air Force satellite, spacecraft, and upper- stage mission requirements. A corollary objective was the identification of those propulsion system components which are currently the major contributors to propulsion system failures. Nearly one hundred component level and failure mode level models were developed in the course of the study. Inherent in the reliability modeling was a quantitative assessment of the uncertainty associated with each estimate. System level assessments were performed using functionally oriented fault trees. The functional approach was used to yield fault trees that are least affected by changes and revisions at the component level. System assessments were performed by aggregating the component reliability and uncertainty results through the fault tree logic using computer programs and approximation techniques which were modified or developed for this purpose.
- Electric and Ion Propulsion