| VibraQuest -> Order Tracking |
| Common mechanical phenomena in rotating/reciprocating machinery are related to the rotational speed of the shaft. In the conventional frequency analysis, a signal is sampled at instances with the fixed-time interval. However, the running speed of a rotating machine is generally not constant. Speed fluctuations are common in machines operating under load varying conditions. Sometimes it is important to examine the start-up or shut-down conditions. In these cases, the conventional frequency analysis produces significant spectral smearing or leakage, which makes it difficult to detect defects associated with various mechanisms. With tachometer, a signal can be sampled with fixed-angle interval, which avoids the problems mentioned above. Our Order
Analysis Module provides state-of-art Gabor expansion-based order analysis method, as well as resampling method for on-line order tracking. |
Features
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Transient data acquisition and on-line order analysis
- Digital and analog tachometer processing for accurate
RPM calculation
- Designed to separate RPM-synchronous and non-synchronous components
- Automatic order selection tools to extract the most significant orders
- Real-Time data resampling and order spectrum
- Order extraction without tachometer
- Versatile and colorful data presentation allows better
interpreting data: order tracking, order
spectrum, color
maps, waterfall, orbit, centerline, Bode plot, polar plot
- Slow roll compensation
- Accurate RPM estimation leads to robust order
spectrum calculation and order extraction
- Useful tool to reveal critical speeds, resonance's,
oil whirl/whip, instability, and load fluctuation effects
- Amplitude and phase of first order for balancing
and foundation diagnoses of rotors
- Measure power distribution in terms of RPM/time/frequency
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Transient Data Acquisition
Our data acquisition (DAQ) system can measure digital/analog
tachometer, ICP transducer, proximity probe and all standard industrial
transducer
signals. The DAQ devices possess high dynamic range and
wide bandwidth. The on-line order analysis provides full
capabilities to display the order spectrum, spectral map, waterfall,
orbit, and Bode plots.
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User defines Maximum Order, Start
RPM, End RPM, and RPM interval. Measurement will be based on speed
profile
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Real time RPM processing
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Any number of orders
can be tracked during data acquisition*
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Real-time data re-sampling, and order normalized spectrum.
* Limited to CPU speed and the maximum order
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Transient data acquisition function allows user to capture short-time,
rotational speed related phenomena.
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top
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Order Tracking
Track orders up to maximum order of captured data.
X-axis has three choices: Time, Revolution, and RPM.
Resize data blocks, and choose any section of the data for order tracking.
User defined pulses/revolution
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Order tracking tab in the order analysis panel offers the user freedom
to select orders up to the maximum order defined in the data acquisition
phase. Also, the user can choose any section of the data to process.
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Order Spectrum
Displays order spectrum at RPM intervals defined in data acquisition
phase.
User has the choice to resize the data block.
The Speed Profile graph displays the rotational speed change during data
acquisition phase.
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Order spectrum of a accelerometer during a start up
test on Spectra Quest Machinery Fault Simulator.
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Color
Maps
Spectral maps with choice of RPM vs. order vs. amplitude, RPM vs. frequency
vs. amplitude, frequency vs. time vs. amplitude, RPM vs. time vs. amplitude.
Flexibility to represent data in different ways.
Side and bottom graphs display slice data according to the position of
the cursor.
User defined pulses/revolution.
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Intensity plot of a accelerometer during start up test on SpectraQuest
Machinery Fault Simulator Lite. The machine reached resonance at 2200 RPM.
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| Waterfall
Plot |
3-D Waterfall Plot (how the RPM contents change with
respect to frequency) showing oil-whirl and oil-whip signatures of a
signal acquired on SpectraQuest's MFS-Lite
Extended.
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