الفهرس 
Historical background of shaft centerline.Only 14 pages are availabe for public view
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Abstract
The average shaft centreline plot is an XY plot of the average position of the shaft in the measurement plane. The circle drawn on the plot represents the diametral clearance of a nearby bearing or seal. The combination allows us to visualize the average position of the shaft relative to the available clearance during start up, shutdown, or over time. The average shaft centreline plot is useful for detecting and confirming the existence of many machine malfunctions, such as rub, fluid-induced instability, bearing wear or erosion, and misalignment. The combination of the shaft centreline plot, the bearing clearance circle, and the orbit can produce a very powerful and complete picture of the static and dynamic response of the shaft relative to the bearing.