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Probabilistic assessment of space nuclear propulsion system nozzleIn assessing the reliability of a space nuclear propulsion system (SNPS) nozzle, uncertainties associated with the following design parameters were considered: geometry, boundary conditions, material behavior, and thermal and pressure loads. A preliminary assessment of the reliability was performed using NESSUS (Numerical Evaluation of Stochastic Structures Under Stress), a finite-element computer code developed at the NASA Lewis Research Center. The sensitivity of the nozzle reliability to the uncertainties in the random variables was quantified. With respect to the effective stress, preliminary results showed that the nozzle spatial geometry uncertainties have the most significant effect at low probabilities whereas the inner wall temperature has the most significant effect at higher probabilities.
Document ID
19940033193
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shah, Ashwin R. (Sverdrup Technology, Inc. Brook Park, OH., United States)
Ball, Richard D. (Loral AeroSys North Olmsted, OH., United States)
Chamis, Christos C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1994
Subject Category
Structural Mechanics
Report/Patent Number
E-8682
NASA-TM-106539
NAS 1.15:106539
Meeting Information
Meeting: ASME International Gas Turbine and Aerospace Congress Exposition
Location: Cincinnati, OH
Country: United States
Start Date: May 24, 1994
End Date: May 27, 1994
Accession Number
94N37704
Funding Number(s)
CONTRACT_GRANT: NAS3-25266
PROJECT: RTOP 584-04-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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