Patent ID: 11972642
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A rotating machinery diagnosis and monitoring method using vibration values and rotation speeds which are operation data of a rotating machine, comprising the steps of:
receiving vibration values of the rotating machinery from a vibration meter;
receiving rotation speeds of the rotating machinery from a speed sensor identifying peak values of the vibration values; and
evaluating a degree of abnormality of the rotating machine from magnitude of the peak values of the vibration values and/or the rotation speeds at the peak values of the vibration values,
wherein evaluating the degree of abnormality from the rotation speeds at the peak values of the vibration values is based on an index with respect to a critical speed,
creating a two-dimensional graph in which points are plotted in a coordinate system with coordinate axes indicating the vibration values and the rotation speeds, the points being defined by the peak values and the rotation speeds corresponding to the peak values,
displaying externally the two-dimensional graph created by the computing section,
dividing the two-dimensional graph into multiple rectangular areas, each of the rectangular areas defined by a first vibration level, a second vibration level that is greater than the first vibration level, a first rotation speed and a second rotation speed that is greater than the first rotation speed,
dividing the multiple rectangular areas at least into a first area in proximity to a critical speed region of the rotating machine and a second area that exists in a position away from the first area, and
wherein, in an evaluation of a degree of abnormality by using the rotation speeds corresponding to the peak values, for any magnitudes of the vibration that give the peak values evaluating a degree of abnormality to be higher when the points defined by the peak values and the rotation speeds corresponding to the peak values are plotted in the second area than when the points defined by the peak values and the rotation speeds corresponding to the peak values are plotted in the first area.