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Degradation modelling with operating mode changes

Remaining Useful Life (RUL) estimation is one of the main objectives of the fault prognosis, as it is the key element of the Condition-based Maintenance. This paper proposes a method of estimating the RUL in the presence of operating mode changes of the system by modeling the trend Health Index. The model does not require the knowledge of failure occurrence time and takes into account the current state of the system. Two application scenarios where the run to failure data is available and unavailable are given to show the efficiency of the developed method.