Latent degradation indicator estimation using condition monitoring information
Zhou, Yifan, Ma, Lin, Sun, Yong, & Mathew, Joseph (2008) Latent degradation indicator estimation using condition monitoring information. In Gao, Jinji, Lee, Jay, Ni, Jun, Ma, Lin, & Mathew, Joseph (Eds.) 3rd World Congress on Engineering Asset Management and Intelligent Maintenance Systems Conference, 27-30 October 2008, Beijing, China.
Asset health prediction is imperative to optimal asset management. Online and offline inspections can provide useful information for predicting asset health. The information from an asset health inspection can be divided into two types. (1) Direct indicators which directly determine failures (e.g. the thickness of a brake pad, or the wear in a component) and (2) indirect indicators which are not related to failures directly (e.g. vibration signals or oil analysis results). The direct indicators can provide more precise reference for the maintenance strategy determination. However, these direct degradation indicators are often technically or economically impossible to inspect frequently and accurately. The indirect indicators, on the other hand, can be acquired more easily using various condition monitoring techniques. This paper proposes two continuous state space models to estimate and predict direct degradation indicators using indirect degradation indicators. The two continuous state space models adopt the Wiener process and the Gamma process respectively. The Expectation Maximization (EM) algorithms based on the modified Kalman smoother and the modified particle smoother are used to estimate the parameters of the proposed models. The application process of the EM algorithms and the characteristics of the state space models are illuminated through a simulation study. Finally, a case study using the data from an accelerated test of a gear box is conducted to justify the feasibility of the proposed models.
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|Item Type:||Conference Paper|
|Keywords:||Condition monitoring, State space model, EM algorithm, Particle smoother, Kalman smoother|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Mechanical Engineering not elsewhere classified (091399)|
|Divisions:||Current > Research Centres > CRC Integrated Engineering Asset Management (CIEAM)
Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
|Copyright Owner:||Copyright 2008 Springer|
|Copyright Statement:||This is the author-version of the work. Conference proceedings published, by Springer Verlag, will be available via SpringerLink. http://www.springerlink.com SpringerLink|
|Deposited On:||13 Nov 2008 00:00|
|Last Modified:||29 Feb 2012 13:45|
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