When monitoring a large journal bearing with two proximity probes, which graph is most commonly analyzed?

In the context of monitoring a large journal bearing with two proximity probes, the orbit graph is particularly significant because it provides a clear representation of the movement of the shaft within the bearing. The orbit graph illustrates the path traced by the shaft center relative to the center of the bearing, allowing analysts to observe various characteristics of the shaft's motion, such as deviations, misalignments, and potential resonances.

This type of analysis is essential for understanding the dynamic behavior of the bearing system. By examining the orbit graph, technicians can identify potential issues such as excessive clearance, wear, or instability within the bearing. The orbit pattern and its shape can indicate the condition of the bearing and help in diagnosing problems before they lead to failure.

While other graphs such as time waveforms, overall trends, and spectra provide important information about different aspects of vibration and operational health, the orbit graph specifically addresses the spatial characteristics of the shaft's movement and its interaction with the bearing surfaces, making it the most commonly analyzed graph in this scenario.