Prognostic-Enabling an Electrohydrostatic Actuator (EHA) System

Sonia Vohnout, David Bodden, Byoung Uk Kim, Dennis Cascio, Steve Brzuszkiewicz, Robert Wagoner, N. Scott Clements, Roy Wagemans, Patrick Edwards, Matthew Rounds, Neil Kunst, and Bill Gleeson
Submission Type: 
Full Paper
AttachmentSizeTimestamp
phmc_12_138.pdf1.25 MBSeptember 13, 2012 - 4:34pm

A proof-of-concept prognostic solution for certain failure modes in the power electronics that drive the flight-critical F-35 Joint Strike Fighter (JSF) electrohydrostatic actuators (EHA) is presented. This program was led by Ridgetop Group under U.S. NAVAIR Small Business Innovation Research (SBIR) funding, and included Lockheed Martin Aeronautics Company (LM), Moog, and Dell Services (Netherlands). Degradation of the optocoupler that isolates the control electronics from the power electronics was simulated in the lab by physically changing resistance values to alter the current transfer ratio. It is proposed that this degradation would also be indicative of insulated gate bipolar transistor (IGBT) wearout. The experimental approach, the test facility, the data analysis and the findings are discussed. An Off-Board Prognostics Health Management (OBPHM) Demonstrator, developed by Ridgetop Group and Dell Systems and representative of the production OBPHM application currently deployed for the F-35 is described. Implementation considerations and challenges are also discussed.

Publication Year: 
2012
Publication Volume: 
3
Publication Control Number: 
138
Page Count: 
12
Submission Keywords: 
prognostics
EMA
CBM
IGBT
Electrohydrostatic Actuator
EHA
optocoupler
Submission Topic Areas: 
CBM and informed logistics
Component-level PHM
PHM for electronics
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