Patent ID: 6801864
Filing Date: 2004-10-05
Classification: G01H,G01M

Abstract:
A method, comprising:collecting vibration signal data from at least one vibrating device, wherein the vibrating device includes at least a rotating inner ring, a rotating outer ring, and a plurality of rotating elements; enveloping the vibration signal data, wherein enveloping the vibration signals includes applying the vibration signal data to a first filter, a rectifier, and a second filter, wherein the first filter is a high pass 4th order Bessel filter having a high pass cut off frequency that is based, at least in part, upon the angular velocity of a shaft speed in the vibrating device, and wherein the second filter is a 2nd order band pass filter having a band pass low cut off frequency and a band pass high cut off frequency that are each based, at least in part, upon the angular velocity of the shaft speed; converting the vibration signal to a frequency domain signal; determining a noise floor of a frequency domain signal, wherein determining excludes a portion of the frequency domain signal that is associated with damage or original manufacture defects in the rotating inner ring, the rotating outer ring, and the plurality of rotating elements; determining the amplitudes of selected portions of the frequency domain signal, wherein the selected portions are associated with the frequency of rotation of the rotating inner ring, the rotating outer ring, and the rotating elements, and wherein determining the amplitudes includes determining the highest amplitudes in the portions of the frequency domain signal that are respectively associated with the defects in the rotating inner ring, the rotating outer ring, and the plurality of rotating elements; dividing the determined amplitudes of the frequency domain signal by the determined noise floor; comparing the result of the dividing to user-definable alarm levels; and displaying a warning if the result exceeds the user-definable alarm levels.