Patent ID: 8676514

Claim:
A method for monitoring the health of a plurality of blades, comprising: determining a standard deviation utilizing delta times of arrival corresponding to the plurality of blades by using a processing subsystem; determining a first delta standard deviation utilizing the standard deviation and an initial standard deviation by the processing subsystem; determining a normalized delta time of arrival corresponding to one or more of the plurality of blades utilizing the first delta standard deviation by the processing subsystem; determining a standard deviation of the normalized delta time of arrival by the processing subsystem; determining a second delta standard deviation utilizing the standard deviation of the normalized delta time of arrival and a previous standard deviation of normalized delta time of arrival by the processing subsystem; and determining a corrected time of arrival corresponding to the one or more of the plurality of blades based upon the second delta standard deviation by the processing subsystem, wherein determining the normalized delta time of arrival utilizing the following equation: Norm — ΔTOA k ( t )=Δ TOA k ( t )− K *(Δσ( t ) — 1)−Mean(Δ TOA 1toj ( t )) where Norm_ΔTOA k (t) is a normalized delta time of arrival corresponding to a blade k at a t instant of time, ΔTOA k (t) is a delta time of arrival corresponding to the blade k at the t instant of time and Δσ(t) — 1 is the first delta standard deviation at the t instant of time and K is a constant.