Patent ID: 6477485
Filing Date: 2002-11-05
Classification: G05B,G06K

Abstract:
A method of monitoring health of an operating system, comprising:in an initial phase of empirically determining a representation of normal operation of said system (a) connecting a plurality of sensors to said system, each sensor providing a signal manifestation of a condition or state of said system; (b) recording as a group, said signal manifestations of all of said sensors repetitively, in a time sequence, along with a signal manifestation of the time of recording such group; (c) performing said step (b) over many weeks of time; (d) in response to said data manifestations provided by said step (c), providing a base probability transition matrix of the data represented thereby as an indication of normal system behavior; then, to determine health of said system on a current basis during normal operation of said system (e) performing said step (b) over a period of time of interest; (f) in response to said data manifestations resulting from performance of said step (e), providing a current probability transition matrix of the data represented thereby; (g) performing matrical subtraction of said current probability transition matrix from said base probability transition matrix to provide a deviation matrix; (h) taking a first cumulative distribution norm of said deviation matrix in order to provide a scalar value of the deviation of said current condition from said base condition of normal system behavior; and (i) taking a second cumulative distribution norm of said deviation matrix in order to provide a scalar value of the relative deviation of said current condition from said base condition of normal system behavior.