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Health monitoring

  • US 6,928,370 B2
  • Filed: 07/05/2001
  • Issued: 08/09/2005
  • Est. Priority Date: 07/05/2000
  • Status: Expired due to Term
First Claim
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1. A method for monitoring the health of a system, which comprises performing at each of a plurality of times the steps of:

  • constructing a condition signature for a present time from a plurality of condition indicators including (a) a plurality of vibration measurements acquired from said system or (b) one or more vibration measurements and one or more performance parameter measurements acquired from said system;

    predicting a normal signature from a model defining one or more inter-dependencies between condition indicators used to construct the condition signature for a previous time, said normal signature corresponding to a condition signature for a healthy system at the present time, and said model comprising a matrix with one or more non-zero off-diagonal terms to define said inter-dependencies;

    comparing said condition signature for the present time with said normal signature; and

    registering an event if said condition signature for the present time differs from said normal signature by more than a predetermined threshold.

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