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Requirements Flowdown for Prognostics and Health ManagementPrognostics and Health Management (PHM) principles have considerable promise to change the game of lifecycle cost of engineering systems at high safety levels by providing a reliable estimate of future system states. This estimate is a key for planning and decision making in an operational setting. While technology solutions have made considerable advances, the tie-in into the systems engineering process is lagging behind, which delays fielding of PHM-enabled systems. The derivation of specifications from high level requirements for algorithm performance to ensure quality predictions is not well developed. From an engineering perspective some key parameters driving the requirements for prognostics performance include: (1) maximum allowable Probability of Failure (PoF) of the prognostic system to bound the risk of losing an asset, (2) tolerable limits on proactive maintenance to minimize missed opportunity of asset usage, (3) lead time to specify the amount of advanced warning needed for actionable decisions, and (4) required confidence to specify when prognosis is sufficiently good to be used. This paper takes a systems engineering view towards the requirements specification process and presents a method for the flowdown process. A case study based on an electric Unmanned Aerial Vehicle (e-UAV) scenario demonstrates how top level requirements for performance, cost, and safety flow down to the health management level and specify quantitative requirements for prognostic algorithm performance.
Document ID
20140006575
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Goebel, Kai (NASA Ames Research Center Moffett Field, CA, United States)
Saxena, Abhinav (Stinger Ghaffarian Technologies, Inc. (SGT, Inc.) Moffett Field, CA, United States)
Roychoudhury, Indranil (Stinger Ghaffarian Technologies, Inc. (SGT, Inc.) Moffett Field, CA, United States)
Celaya, Jose R. (California Univ. Irvine, CA, United States)
Saha, Bhaskar (MCT, Inc. Moffett Field, CA, United States)
Saha, Sankalita (MCT, Inc. Moffett Field, CA, United States)
Date Acquired
June 3, 2014
Publication Date
January 29, 2012
Subject Category
Instrumentation And Photography
Systems Analysis And Operations Research
Behavioral Sciences
Report/Patent Number
ARC-E-DAA-TN4707
Meeting Information
Meeting: Annual Interdisciplinary Conference
Location: Breckenridge, CO
Country: United States
Start Date: January 29, 2012
End Date: February 3, 2012
Sponsors: California Univ.
Funding Number(s)
CONTRACT_GRANT: NNA08CG83C
WBS: WBS 466199
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
video acuity
video systems
performance

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