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

Claim 0:
1. A rotating machinery diagnosis and monitoring system, comprising:
a vibration meter;
a rotation speed sensor; and
a diagnosis and monitoring device including one or more processors and one or more non-transitory computer-readable storage media, the non-transitory computer-readable storage media having stored thereon an input section, a computing section and an output section, wherein,
the input section receives vibration values from the vibration meter and rotation speeds from the rotation speed sensor as operation data of a rotating machine;
the computing section performs computations using the operation data received; and
wherein the computing section is configured to identify peak values of the vibration values and evaluate 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, and
wherein the output section is configured to display externally a result of evaluations performed by the computing section, and
wherein the computing section is configured to evaluate the degree of abnormality from the rotation speeds at the peak values of the vibration values based on an index with respect to a critical speed,
wherein the computing section is further configured to create 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, and
wherein the output section is further configured to display externally the two-dimensional graph created by the computing section,
wherein the two-dimensional graph is divided into multiple rectangular areas, each of the multiple 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,
wherein the multiple rectangular areas are divided 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 a degree of abnormality is evaluated 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.