| Agilis Group | Agilis Measurement Systems | Agilis Engineering |
Quick Reference |
| Blade Tip Timing |
| Engine Health Monitoring |
| Finite Element Model |
| Event Determination |
| Probe Sensors |
| Observed Engine Order |
| Traveling Wave Plot |
NSMS Fundamentals
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Synchronous Realtime AnalysisRealtime Synchronous analysis is performed using LSMF (Least Squares Model Fitting) analysis. This analysis package performs a least squares fitting of multiple,pre-selected,sine wave models. The frequency or order of the sine waves is determined from the selected models components on the Campbell diagrams. The fitted amplitudes and phase values are then displayed in various manners such as bar charts and blade waterfall plots. The bar chart shows the individual blade amplitudes for the selected model component. It displays the maximum, minimum and average statistical values. |
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The blade waterfall plots display all blades' amplitudes plotted against time traces or plotted linear with rotor speed. These plots are useful for understanding blade-to-blade coupling and for monitoring relationships between rpm and resonant responses. As in the above example, Traveling Wave analysis can also be run concurrently. This is useful for non-synchronous response analysis but also shows any non-stationary synchronous vibrations such as mistuning effects and hardware transmission. A "near-reatime" LSMF analysis is also available. This operates from the data stored in the RPM Map. It is useful for determining resonant rpm values and damping coefficients during engine testing. |
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Stack PlotA stack plot, such as the one above, displays the variation in the inter-spacing from an ideal, equally spaced, baseline position. This is useful for monitoring the health of a stage. Deviation form the baseline stack pattern could indicate the propagation of a crack or some other mechanical misalignment. Foreign object damage (FOD) can also be observed if the damage causes static deflection changes at the probe measurement location. |