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Model-Based Diagnostics for Propellant Loading SystemsThe loading of spacecraft propellants is a complex, risky operation. Therefore, diagnostic solutions are necessary to quickly identify when a fault occurs, so that recovery actions can be taken or an abort procedure can be initiated. Model-based diagnosis solutions, established using an in-depth analysis and understanding of the underlying physical processes, offer the advanced capability to quickly detect and isolate faults, identify their severity, and predict their effects on system performance. We develop a physics-based model of a cryogenic propellant loading system, which describes the complex dynamics of liquid hydrogen filling from a storage tank to an external vehicle tank, as well as the influence of different faults on this process. The model takes into account the main physical processes such as highly nonequilibrium condensation and evaporation of the hydrogen vapor, pressurization, and also the dynamics of liquid hydrogen and vapor flows inside the system in the presence of helium gas. Since the model incorporates multiple faults in the system, it provides a suitable framework for model-based diagnostics and prognostics algorithms. Using this model, we analyze the effects of faults on the system, derive symbolic fault signatures for the purposes of fault isolation, and perform fault identification using a particle filter approach. We demonstrate the detection, isolation, and identification of a number of faults using simulation-based experiments.
Document ID
20110012045
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Daigle, Matthew John (California Univ. Moffett Field, CA, United States)
Foygel, Michael (Stinger Ghaffarian Technologies, Inc. (SGT, Inc.) Moffett Field, CA, United States)
Smelyanskiy, Vadim N. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 25, 2013
Publication Date
March 4, 2011
Publication Information
ISBN: 978-1-4244-7351-9
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
IEEEAC Paper 1436
ARC-E-DAA-TN2715
Meeting Information
Meeting: 2011 IEEE Aerospace Conference
Location: Big Sky, MT
Country: United States
Start Date: March 4, 2011
End Date: March 12, 2011
Sponsors: Institute of Electrical and Electronics Engineers
Funding Number(s)
CONTRACT_GRANT: NAS2-03144
CONTRACT_GRANT: NNA08CG83C
Distribution Limits
Public
Copyright
Public Use Permitted.

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