The use of high-performance fatigue mechanics and the extended Kalman / particle filters, for diagnostics and prognostics of aircraft structures

Hai Kun Wang, Robert Haynes, Hong Zhong Huang, Leiting Dong, Satya N. Atluri

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In this paper, we propose an approach for diagnostics and prognostics of damaged aircraft structures, by combing high-performance fatigue mechanics with filtering theories. Fast & accurate deterministic analyses of fatigue crack propagations are carried out, by using the Finite Element Alternating Method (FEAM) for computing SIFs, and by using the newly developed Moving Least Squares (MLS) law for computing fatigue crack growth rates. Such algorithms for simulating fatigue crack propagations are embedded in the computer program Safe- Flaw, which is called upon as a subroutine within the probabilistic framework of filter theories. Both the extended Kalman as well as particle filters are applied in this study, to obtain the statistically optimal and semi-optimal estimates of crack lengths, from a series of noisy measurements of crack-lengths over time. For the specific problem, a simple modification to the particle filter, which can drastically reduce the computational burden, is also proposed. Based on the results of such diagnostic analyses, the prognostics of aerospace structures are thereafter achieved, to estimate the probabilistic distribution of the remaining useful life. By using a simple example of a single-crack near a fastener hole, we demonstrate the concept and effectiveness of the proposed framework. This paper thus forms the scientific foundation for the recently proposed concepts of VRAMS (Virtual Risk-Informed Agile Maneuver Sustainment) and Digital Twins of aerospace vehicles.

Original languageEnglish
Pages (from-to)1-24
Number of pages24
JournalCMES - Computer Modeling in Engineering and Sciences
Volume105
Issue number1
StatePublished - 2015

Keywords

  • Diagnostics and prognostics
  • Extended kalman filter
  • Fatigue mechanics
  • Particle filter

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