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NASA NTRS · 20140008531

Application of Model-based Prognostics to a Pneumatic Valves Testbed

Daigle, Matthew·Kulkarni, Chetan S.·Gorospe, George
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Abstract

Pneumatic-actuated valves play an important role in many applications, including cryogenic propellant loading for space operations. Model-based prognostics emphasizes the importance of a model that describes the nominal and faulty behavior of a system, and how faulty behavior progresses in time, causing the end of useful life of the system. We describe the construction of a testbed consisting of a pneumatic valve that allows the injection of faulty behavior and controllable fault progression. The valve opens discretely, and is controlled through a solenoid valve. Controllable leaks of pneumatic gas in the testbed are introduced through proportional valves, allowing the testing and validation of prognostics algorithms for pneumatic valves. A new valve prognostics approach is developed that estimates fault progression and predicts remaining life based only on valve timing measurements. Simulation experiments demonstrate and validate the approach.

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Daigle, Matthew, Kulkarni, Chetan S., Gorospe, George. 2014-03-01. Application of Model-based Prognostics to a Pneumatic Valves Testbed. https://ntrs.nasa.gov/citations/20140008531

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