Use of Paris Law for Prediction of Component Remaining Life

Vibration based health and usage monitoring systems (HUMS) are providing good information as to the current state of a component, (e.g. health), but other than simple trending, are not robust enough to yield an estimated of the remaining useful life (RUL). There are three fundamental problems that need to be address to accurately estimate RUL. First, health index data is noisy. Even with filtering, the HI can be difficult to trend. Second - a damage model is required address component degradation. Finally, a relationship between physical damage and measured health/condition needs to be established.