• Condmaster Ruby Module Orbit Analysis and Shaft Centerline Plot
• Orbit graph of movement of shaft centerline, used to detect failures like rubs, unbalance, misalignment
• Orbit graph shows an overlay of the graphs for each measured revolution plus their average
• When orbit assignment is set up in Condmaster Ruby, alert limits can be set on the X and Y axis
• Shaft Centerline Plot is a function available with Leonova Diamond

Orbit Analysis is a vibration measurement function offered as a module for Condmaster Ruby. The resulting orbit graph shows the movement of the shaft’s centerline and is used to detect failures like rubs, unbalance, misalignment, or oil whip on machinery with journal bearings.

Measurements are normally performed with Leonova Diamond, Intellinova Standard or Intellinova Parallel EN on the buffered outputs of a machine protection system. Intellinova Parallel EN requires a Displacement Signal Interface for measurements on buffered outputs of a machine protection system. Measurements can also be made with e.g. accelerometers to get a two-dimensional graph of the mechanical forces on the bearing housing. Required are two channel simultaneous vibration measurement and two transducers placed at an angle of 90° to each other, plus a trigger signal from a tachometer probe.

Settings include transducer type, signal unit, and filter type, either bandpass (default) or lowpass. Orders is set to 1 by default, but the user can select from 1 to 5 orders. The number of revolutions parameter, max. 25, specifies the number of shaft revolutions to acquire and display in the orbit graph.

The orbit graph shows an overlay of the graphs for each measured revolution plus their average. The user can select each individual revolution as well as the average of all revolutions. The selected graph is marked blue, with a blue arrow showing the angle and the x/y values at that angle. The user can move the arrow on the screen in the orbit graph. When the orbit assignment is set up in Condmaster Ruby, alert limits can be set on the X and Y axis, resulting in an evaluated measurement (green - yellow - red scale).

Shaft Centerline Plot is a function available with Leonova Diamond. Especially useful for assessment of lubrication during start-up of a machine with journal bearings, the plot displays changes in radial rotor position over a range of speed. Settings for Shaft centerline plots are made in Leonova Diamond. The results can be viewed in Condmaster Ruby after the measuring round is uploaded.