Physically based diagnosis and prognosis of cracked rotor shafts

Charles H. Oppenheimer; Kenneth A. Loparo

doi:10.1117/12.475502

16 July 2002 Physically based diagnosis and prognosis of cracked rotor shafts

Charles H. Oppenheimer, Kenneth A. Loparo

Proceedings Volume 4733, Component and Systems Diagnostics, Prognostics, and Health Management II; (2002) https://doi.org/10.1117/12.475502
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

A physics-based approach for diagnostics and prognostics using integrated observers and life models is presented. Observers are filters based on physical models of machine- fault combinations and use measured machine signatures to identify and characterize the state of a machine. Observers are adaptively deployed as a machine wears and can be coupled with one another to handle interacting conditions and faults. The scheme is detailed using the fault of a cracked rotor shaft that interacts with gravity and imbalance. Observers for shaft cracking and imbalance are presented. The observers provide machine condition and fault strengths to life models used to determine remaining machine life. A life model based on the Forman crack growth law of linear elastic fracture mechanics is developed to determine the number of machine cycles remaining until catastrophic failure.

Citation Download Citation

Charles H. Oppenheimer and Kenneth A. Loparo "Physically based diagnosis and prognosis of cracked rotor shafts", Proc. SPIE 4733, Component and Systems Diagnostics, Prognostics, and Health Management II, (16 July 2002); https://doi.org/10.1117/12.475502

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