Condition-based maintenance by particle filtering

When the health state of a component can be monitored, condition-based policies can be devised to maintain it dynamically on the basis of the observed conditions (Marseguerra et al., 2002 andChrister et al., 1997). However, often in practice the degradation state of a component can not be observed directly, but rather must be inferred from some observations, usually affected by noise and disturbances.