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Versatile system for analysis of rotating machinery harmonics in operation -
The LMS Test.Lab 16 Channel Harmonic Analysis system offers online and offline order analysis based on narrow-band waterfall spectra and colour-maps, measured on rotating equipment in operating conditions. Data acquisition is conducted on a portable LMS SCADAS 305 front-end with two embedded tacho inputs, supporting 16 channels for ICP® and Voltage signals (including quasi-static parameters), which can be expanded to 20 channels.

With the Signature Testing workbook, spectral data and orders can be measured and processed repeatedly in accordance with custom procedures, making use of pre-defined templates with specified display layouts and measurement settings.

This solution supports acquisition during run-ups, run-downs or sequences of both, at user defined time or rpm intervals. Derived tacho channels enable online monitoring of secondary quantities, such as rotational speed on another axis or vehicle speed. The many online processing and visualization formats include broadband RMS-levels, waterfalls and order-, frequency- and octave sections. With online derived channels, the engineer can add virtual channels by recombining the signals measured on physical channels using both basic and advanced mathematical operations. The multiple sample rates permit the amount of saved data to be reduced by acquiring the vibration channels at a lower sampling rate, while keeping the high sample rate for the acoustic channels. Online reference curves can be used as design targets to validate the current design or can be applied to check the repeatability of multiple runs.

Offline post-processing offers a list of functions for global problem characterization and for gaining a deeper insight into the physical processes.

Features & Benefits

• Online monitoring of multiple parallel measurement functions: spectra, waterfalls and colour maps, octave displays and order sections

• Online and offline order analysis with reference to measured or derived tacho channels

• Online check against reference curves

• Online monitoring of a variety of measurement status indicators (ADC levels, rpm readouts, rpm time traces, rpm levels)

• Offers fast diagnosis capability based on accurate and complete data set

• Reduces errors and accelerates productivity

• Improves the process with online feedback on progress and measurement quality

• Presents fast standard reporting by “single button” operation