Lateral, angular and torsional vibration monitoring of rotordynamic systems
Exemplary embodiments provide a surface of a rotating element with both a phase reference mark and a plurality of additional marks. A proximity probe detects the passage of both the phase reference mark and the plurality of additional marks as they rotate through a detection zone. Both a phase reference signal and a vibration reference signal are generated, which signals are used to calculate lateral and angular (and optionally torsional) vibration of the rotating elements.
1. A method for determining vibration associated with a rotordynamic system having a rotating element, the method comprising:
detecting passage of a phase reference mark on the rotating element as the phase reference mark rotates through a detection zone associated with a detection device;
detecting passage of a plurality of additional marks on the rotating element, wherein the plurality of additional marks are distinguishable from the phase reference mark, as the plurality of additional marks rotate through the detection zone;
generating a phase reference signal based on the detection of the phase reference mark and using the phase reference signal to determine a lateral vibration;
generating a vibration reference signal based on the detection of the plurality of additional marks and using the vibration reference signal to measure an angular vibration; and
applying a correction factor to an amplitude portion of the measured angular vibration to compensate the measured angular vibration.
2. The method of claim 1 , wherein the applying a correction factor further comprises:
multiplying the amplitude portion of the measured angular vibration by the correction factor, wherein the correction factor is determined based upon simulation results.
3. The method of claim 1 , wherein a number of the plurality of additional marks formed on the rotating element is equal to πd/2x, where:
d is a diameter of the surface on which the phase reference mark and the plurality of additional marks are disposed; and
x is a width of the phase reference mark.
4. The method of claim 1 , wherein the detecting passage are performed using an eddy current sensor.
5. The method of claim 1 , wherein the detecting passage are performed using an optical detection device.
6. The method of claim 1 , wherein the phase reference mark has a different depth on the rotating element than the plurality of additional marks.
7. The method of claim 1 , wherein the phase reference mark and the plurality of additional marks have a pitch that is approximately the same.