Patent ID: 6263738
Filing Date: 2001-07-24
Classification: G01H,G01M

Abstract:
A method of monitoring a vibration phasor in a rotating member, comprising the steps of:acquiring at a predetermined time a magnitude of a vibration in said rotating member;acquiring at said predetermined time an angle of said rotating member, wherein said angle acquiring step comprises:generating a signal indicative of a full rotation of said rotating member;incrementing a counter until said signal is again generated, storing a first count of said counter and resetting said counter;reading and storing a second count of said counter at the time of said magnitude acquiring step; anddividing said second count by said first count;determining respective projections of said vibration phasor on a quadrature pair of reference phasors phase locked with said rotating member;filtering said projections through at least one low pass filter;calculating a quantity equal to the square root of the sum of the squares of said projections; anddetermining at least one of magnitude and angle of said vibration phasor by, respectively, multiplying said quantity by 2 and obtaining an arccosine of a value equal to one of said projections divided by said quantity.