6.3.3. Polynomial Model-Based Methods Motivation

The uncertainty of stochastic degradation processes of rotating machinery is generally caused by the following four variability sources: (1) the temporal variability, (2) the unit-to-unit variability, (3) the nonlinear variability, and (4) the measurement variability. The temporal variability is the inherent uncertainty of the degradation processes over time, which is usually represented by random noises in the stochastic process models (Pandey et al., 2009). The unit-to-unit variability implies the diversity of the degradation processes among different machines or components due to their diversity in health states and operation conditions. The unit-to-unit variability is generally denoted ...

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