Supporting AES/EBU and SPDIF data formats, the QDA is a dedicated audio interface module, specifically designed for artificial heads. The QDA accepts 16- or 24-bit data and all standard audio sample rates. HMS data is retrieved from the audio stream and separately sent to the host. Because the QDA resamples the input data to the standard LMS SCADAS III internal sample rates, the output data of QDA is fully compatible with data from other modules. Therefore, digital audio measurements can be done in parallel (synchronous) with other vibration or sound measurements.
This worksheet provides a comprehensive view on all available 2D data (order sections, frequency sections, octave spectra or octave sections, ...) and is designed to compare and average results from various tests very quickly, for validation and/or processing. Selected data are 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 database.
This option enables user-intuitive audio replay using the available PC audio facilities and allows interactive real-time filtering during replay. Replay sessions can conveniently be initialized from multiple LMS Test.Lab displays and the original time traces are automatically retrieved. It allows engineers to closely integrate subjective noise evaluation into the standard measurement process.
Allows the online and off-line calculation of a number of indices related to the human perception of noise, such as Articulation Index, Loudness and Sharpness. The indices are derived from 1/n octave data measured by any of the acquisition workbooks.
Batch Reporting – Organizer
Facilitates organized printing of large quantities of data according to multiple pre-defined plot formats, created in Microsoft Office applications, including Active Pictures. Absolute scale-printing to printer and electronic documents is supported.
Time Recording during Signature Testing
This option enables recording of raw time histories while performing tracked measurements and online narrow band analysis (waterfall, orders, spectra,..). The throughput data is directly written to the host PC disc in LMS TDF format, without affecting the online measurement performance.
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 completion of the measurement and stored together with the measurement channels in the same TDF-data file, so they can be processed simultaneously during the offline throughput processing. With dedicated data validation and selection, data from different measurement runs can be organized and combined for batch processing.
Throughput Validation & Processing Host
This worksheet offers a convenient Strip Chart Display overview of time histories, including zoom-in, immediately after completing a measurement using the parallel throughput functionality, without leaving the data acquisition workbook. It also provides Processing Data Set definition functionality, organizing and combining recordings from different measurements for batch processing. A Quick Spectral Map provides insight in spectral contents of the displayed time histories to guide the selection of appropriate processing parameters.
Signature Throughput Processing
Signature Throughput Processing enables 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 segments of time data to be processed. The module supports trial processing on limited number of channels and batch processing, including auto-saving of results which can be interrupted at any time. It also includes a convenient preview of processing results with auto switch of display depending on type of results.
Signature Data Post-Processing
Completes the on-line analysis functionality by providing various post-processing functions on measured narrow band waterfall data resulting from run-ups or run-downs against specified time or rpm intervals. It contains a comprehensive list of functions for a global problem characterization and for any further processing necessary for gaining a deeper insight into the physical processes.
Time Recording during Real Time Octave Testing
This option enables recording of raw time histories while performing Real Time Octave measurements. The throughput data is directly written to the host PC disc in LMS TDF format, without affecting the online measurement performance.
Offline ANSI-IEC Octave Filtering
This add-in to the Test.Lab Signature Throughput Processing allows to apply time domain based 1/1, _. 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 so that the final result of this add-in are octave maps.
Harmonic Tracking (Kalman Processing)
This Add-In to the Signal Calculator provides 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 display, and allows to store the calculated results.
Time Variant Frequency Analysis
This Add-In to the Throughput Validation & Processing Host includes several Time/Frequency techniques that can determine the instantaneous frequency content of the signal and present the result as a time versus frequency mapping. The Add-in includes visualization of the time histories, as well as color map visualization of the frequency domain results. It includes Short Time FFT and continuous wavelet transformation.
Framed Statistics
This add-in to the Signature Throughput Processing allows a tracked evaluation of a series of statistical values. The size of the sliding window and tracking parameters can be defined. Following statistical parameters are available: minimum, maximum, range, Extremum, RMS, mean, median, sum, integration, Crest factor, percentiles, variance, standard deviation, absolute deviation, extreme deviation, skewness, kurtosis, and Markov
Geometry workbook The LMS Test.Lab Geometry workbook is designed to build a geometrical definition of test structures, that can be used to visualize measurement and analysis results in a 3-dimensional view. The workbook allows to build a structure as an assembly of separate components, and to use different axis systems (Cartesian, cylindrical or spherical) for each component. Point coordinates can be defined in the global axis system or in the local axis system of a component, reducing the complexity of making a geometry definition for real-life structures. Next to the definition of points, the user can easily add lines and surfaces between points in order to come to a realistic representation of the test structure.
Operational Deflection Shapes The user can investigate deformation shapes using order and frequency sections (for instance obtained in LMS Test.Lab Structures), or using FRF or Cross-Power information for stationary conditions (as can be obtained in the LMS Test.Lab Modal Impact workbook). The user can select a data range in wich the animation will automatically scroll, with the possibility to pause and restart the animation at all times. The workbook includes also facilities to only animate at peaks of the function, look for maxima between 2 cursors and much more. Deflection shapes can be calculated at specific cursor values (or automatically calculated within a cursor-defined band) and saved in the project.
LMS SCADAS III Multiple Tacho Support
The LMS Test.Lab SCADAS III Multiple Tacho Support Driver enables the use of multiple PDT modules in the Test.Lab acquisition workbooks.
- Visualizes all system hardware settings in GUI
- Preview of tacho time signals
- Interactive setting of tacho parameters for each tacho channel individually
- Enables for narrow band acquisition the calculation of Order Sections relative to all tacho channels, online or via post-processing
- Enables documentation of measured data with rpm-information from more than 2 tacho channels
