Computed Order Tracking is a method of discovering the amplitude and phase of time varying sine waves which are related to the machine's speed. Phase information is necessary to balance rotors, to generate operating deflection shapes and to detect heavily damped resonance. The order functions obtained with Rotate are leakage free because the instantaneous RPM controls the resampling in the Computed Order Tracking algorithm. Using our data files, we have run Rotate's Computed Order Tracking. The first three orders have been specified to give us the next plot.
Computed order plots are created from many more data points than the orders plotted in the waterfall calculations and are thus a more precise picture of each order. Here you see the phase plots of the three orders in the top pane of the Bode diagram and the amplitude plots in the lower pane. For signal processing, you can select a filter width from 1% to 100%, A, B, C weighting and single or double integration/differentiation. Now that we have seen the Rotate's analysis functions, let's look at the waterfall plots in more detail to see how Rotate2.5 will let you easily manipulate your data to get better views - to help you SEE the noise and vibration problems. |
