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Rotating Machinery – Options

CAN-bus support

LMS Test.Lab CAN-bus support provides CAN-bus data acquisition in parallel to data gathering via the LMS front-ends. The controller area network (CAN) is a message-oriented serial bus system that complies with the ISO 11898 (high speed) and the ISO 11519 (low speed) standards. LMS Test.Lab CAN-bus support provides support for the CAN 2.0B standard (extended frame format) that is widely used in passenger cars and the J1939 standard used in trucks and buses. The CAN channels are handled as regular quasi-static channels, and can be used as tracking channels or give more annotation to dynamic data.

Audio Replay and Filtering

This option supports user-intuitive audio replay using the available PC audio facilities and provides interactive real-time filtering during replay. Replay sessions can conveniently be initialized from multiple LMS Test.Lab displays. The original time traces are automatically retrieved and subjective noise evaluation can be closely integrated into the standard measurement process.

Run Data Averaging and Comparison Organizer

This worksheet provides a comprehensive view on all available 2D data (order sections, frequency sections, octave spectra or octave sections) and is designed to quickly compare and average results from various tests for validation and/or processing. Selected data is immediately displayed via powerful display-filling modes in user-defined screen layouts. Embedded navigation supports fast scrolling across functions or measurement points. Individual measurements are included or excluded from automatic average and envelope calculations by tick-box selection. Averages and envelopes can be stored in project databases.

Time Recording

This option provides raw time history recording while performing tracked measurements and online narrow band analysis (waterfall, orders, spectra). The throughput data is directly written to the host PC disc in TDF or LDSF format, without affecting the online measurement performance.

Time Data Signal calculator

Measured time recordings can be expanded with virtual time histories by recombining physical measurement channels using basic and advanced mathematical operations. These time histories can be calculated automatically upon measurement completion and stored together with the measurement channels in the same TDF or LDSF data file. They can be processed simultaneously during the off-line throughput processing. With dedicated data validation and selection, data from different measurement runs can be organized and combined for batch processing.

Signature Throughput Processing

LMS Test.Lab Signature Throughput Processing provides efficient processing of multiple throughput files with a common set of processing parameters. Tracking channels (e.g. tacho) can be used to control the selection of time data segments to be processed. The module supports trial processing on a limited number of channels as well as batch processing, including auto-saving of results which can be interrupted at any time. It also includes a convenient preview of processing results with display auto switch depending on the type of results.

Signature Data Post-processing

This solution helps analyze and post-process tracked spectral data (narrow band data of run-ups or run-downs) in a signature testing process. It contains a comprehensive list of functions for global problem characterization as well as any further processing necessary to gain a deeper insight into physical processes like FFT, octave mapping, waterfall averaging, merging multiple runs, calculating order sections, frequency sections, loudness and sharpness.

Multi-reference Post-processing

LMS Test.Lab Multi-Reference Post Processing offers efficient processing of multiple throughput files with a common set of processing parameters. LMS Test.Lab Multi-Reference Post-processing is supported for stationary measurements such as time data recorded in the spectral acquisition application; autopower and crosspower can be processed. LMS Test.Lab Multi-Reference Post-processing offers multiple input and output FRFs (H1, H2, Hv), partial coherence and transmissibility off-line processing with autopower and crosspower as input.

ANSI-IEC Octave Filtering

This add-in helps apply time domain-based 1/1, 1/2, 1/3, 1/6, 1/12 or 1/24 octave filters. The resulting time traces (each corresponding to individual octave bands) are then further processed by applying tracking and triggering, which eventually results in octave maps. The add-in can be used during acquisition or during off-line throughput processing.

Order Tracking

This add-in provides synchronously sampled data and accurate order tracking in case of fast run-ups/run-downs or closely spaced orders. The add-in presents real-time results when loaded in the LMS Test.Lab Standard or Advanced Signature Testing applications. Alternatively, the results can be loaded in the LMS Test.Lab Signature Throughput Processing solution to extend the off-line processing capabilities.

Angle Domain Processing

This add-in provides adaptive re-sampling of time data to the angle domain whereby multiple revolutions can be combined into a single cycle and synchronized with the rotating or reciprocating engine’s duty cycle. Re-sampled data can then be processed towards angle maps according to any tracking parameter (rpm, torque) or averaged towards a single cycle. Statistical parameters can be calculated within user-definable gates for further in-depth analysis. Multiple cylinders can be analyzed during a single processing run.

Harmonic Tracking (Kalman Processing)

This add-in to the time signal calculator presents the Kalman filtering technique to track sine, sine sweeps and other harmonically related signals. It is ideal for extreme slew rate applications. Extracted time histories can be viewed as function of time or rpm. The add-in includes visualization via strip chart displays, and provides the option to store the calculated results.

Harmonic Removal

When performing operational modal analysis on structures with rotating components, such as helicopters or rotating machinery (in either stationary or slowly varying RPM), component harmonics could influence test results. With the LMS Test.Lab Harmonic Removal add-in, the harmonic contents from the time data can be filtered out.

Time Variant Frequency Analysis

This add-in to LMS Test.Lab Throughput Validation and Processing includes several time/frequency techniques that can determine the instantaneous signal frequency content and present the result as a frequency versus time map. The add-in includes time history and color map visualization of the frequency domain results. It includes short time FFT and continuous wavelet transformation.

Off-line RPM-extraction

The LMS Test.Lab Off-line RPM-extraction add-in supports rpm-time traces calculation starting from accelerometer or microphone data. On a color map, users can select single or multiple points to indicate important orders according to the rotational speed causing them. Based on this selection, the tool will automatically extract an rpm-time trace from the data, which can be used for further order analysis. Multiple methods are available to tackle the most challenging rpm evolutions (e.g. turbo rpm behavior). The tool can also be used to extract non-rpm related signal evolution versus time (e.g. in case of hybrid powertrains).

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