Software for Operational Modal Analysis ARTeMIS

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Technical Specifications for the ARTeMIS Family

• System Requirements
• Geometry Generator
• Data Input, Data Output
• Data Output with more features
• Signal Processing
• Operating Deflection Shapes
• Frequency Domain Modal Analysis
• Enhanced Frequency Domain Decomposition Modal Analysis
• Curve-fit Frequency Domain Decomposition Modal Analysis
• Stochastic Subspace Identification Modal Analysis
• Validation

System Requirements

ARTeMIS is a software platform designed for Microsoft Windows. To increase speed it makes use of mathematical libraries from Intel. The help system is based on the Microsoft Internet Explorer.

• Intel® 32-bit processor architecture
• Microsoft® 32-bit Windows XP or Windows Vista
• Microsoft Internet Explorer 7
• 128MB of RAM (256MB recommended)
• 500MB of available hard-disk space. Since the space requirement is heavily dependent on the ARTeMIS Extractor projects stored, 1 GB is recommended
• 1,024x768 screen resolution
• CD-ROM drive or internet connection required for installation
• Internet connection or email system required for first time activation.

Geometry Generator

• Universal File Format (UFF or UNV extension)
  UFF data sets 15 (nodes), 2411 (nodes), 82 (trace lines) and 2412 (triangular plate elements).
• SVS Configuration File Format (CFG extension)
• Object orientated drawing enabling drawing of complex structures using more basic sub-elements each with its own grid plane and coordinate system.
• Drawing options are: points, lines and triangular surfaces. Elements can be drawn using the mouse or by entering information in tables using the keyboard or copy/paste operations.
• Available in Analyzer and Testor

Data Input

• Universal File Format (UFF) ASCII as well as binary import of measured time series.
• SVS Configuration File format and data files: Text (ASCI), SVS binary format, Header File Formats (TEAC HDR, GeoSIG GHF, Diadem, Kyowa), Kinemetrics Altus, MS Wave file format). In text file format data stored as a matrix with measurement channels stored column by column.
• OLE Automation, geometry and measurement data transfer from all other software with OLE Automation support.
• Factory implemented OLE Automation support for direct input from ARTeMIS Testor, Brüel & Kjær Modal Test Consultant and MATLAB.
• Unlimited number of channels (tested with 300 simultaneously measured channels).
• Unlimited number of data points in each record.
• Unlimited number of test setups.
• Assign DOF information (measurement nodes and directions) for imported measurement channels using drag-and-drop (Testor and Analyzer only) on the test geometry or using the keyboard.
• Automatic identification of reference channels when using multiple test setups.
• Automatic updating of test geometry and DOF information when modifying geometry in the Geometry Generator (Testor and Analyzer only).
• Available in all versions of Extractor, Analyzer and Testor

Data Output

• Copy/Paste and Print functions for all graphics and tables.
• Modal results: Universal File Format (ASCII) including geometry, one or more modes in each file.
• Modal results: SVS output files, one or more modes in each file (ASCII).
• Modal results: Interface to FEMtools updating software through UFF.
• Animations: Export of AVI movie files to e.g.Windows Media Player or Microsoft Power Point.
• Available in all versions of Extractor and Analyzer

Data Output

• SVS Configuration File Format (CFG extension)Geometry and DOF information is written directly in this file along with references to the required measurment files. The measurement files can be saved in text file format (ASC extension), SVS binary format (BIN extension).
• Universal File Format (UFF extension)Geometry saved in UFF data sets 15 (nodes), 82 (trace lines) and 2412 (triangular plate elements).
• DOF information and measurements are saved in UFF data sets 58 (ASCII) or 58b (binary) time series format.
• Geometry, DOF information and measurements can be transferred directly to ARTeMIS Extractor using OLE Automation by a click on a single button.
• Available in Analyzer and Testor

Signal Processing

• Decimation, 1-1000 times, digital anti-aliasing filter, cut-off at 0.8 times Nyquist frequency of decimated signals.
• Filtering: low-pass, high-pass, band-pass, bandstop Butterworth, filter order 1-50 poles, arbitrary cut-off frequencies, test for filter stability.
• Projection Channels. Specify if all cross information of the measurement channels should be used or only between fewer number of channels.
• Spectral estimation using FFT and Welch’s averaged periodogram method. Data segment length: radix-2 only limited by the amount of data, overlap: 66.7 %, window: Hanning. Estimates the full spectral matrix if the Projection Channel option is disabled.
• Operating Deflection Shapes. Specify the type of data imported to ARTeMIS Extractor (displacement, velocity, acceleration, other) and specify the unit of the imported data to ensure correct units of the operating deflection shapes.
• Common SSI input matrix estimation to be used in all stochastic subspace identification algorithms. Maximum state space dimension: Only limited by the available amount of data. Noise mode suppression through the use of the Projection Channel option.
• Option for reloading original uploaded data.
• Data Presentation of Test Setups: Spectral magnitude and phase, singular value decomposition of spectral matrix, average of full spectral matrix, average of diagonal elements of spectral matrix, coherence of spectral matrix, time / frequency contour diagram. Cursor read out on all curves.
• Data Presentation of Reference Data: Spectral magnitude and phase, average of full spectral matrix, average of diagonal elements of spectral matrix, coherence of spectral matrix. Cursor read out on all curves.
• Available in all versions of Extractor and Analyzer

Operating Deflection Shapes

• Time domain animation test setup by test setup of all frequency content.
• Frequency domain animation of all test setups using multiple references shape estimation.
• Unscaled or scaled animation using phased assigned spectrum with a specific reference.
• Units (displacement, velocity, acceleration) and scaling specified by the user.
• Graphical information on deflections of selected channels.
• AVI movie creation of animations.
• Available in all versions of Extractor and Analyzer

Frequency Domain Modal Analysis

• User choices: Peak picking.
• Frequency resolution: Defined by number of frequency lines in spectral density function.
• Mode shape estimation: Immediate animation.
• Damping: None.
• Patent protected.
• Available in all versions of Extractor and Analyzer

Enhanced Frequency Domain Decomposition Modal Analysis

• User choices: Peak picking, MAC level for identification of spectral peak, time interval for identification of frequency and damping.
• Mode shape estimation: Immediate animation, mode shape estimate improved by frequency domain averaging.
• Frequency and damping estimation: Estimated from free decays corresponding to identified spectral peak.
• Detection of harmonics and removal of their influence from estimated modal parameters.
• Patent protected.
• Available in Extractor Handy and Pro and Analyzer

Curve-fit Frequency Domain Decomposition Modal Analysis

• User choices: Peak picking, MAC level for identification of spectral peak, frequency interval for identification of frequency and damping.
• Mode shape estimation: Immediate animation, mode shape estimate improved by frequency domain averaging.
• Frequency and damping estimation: Estimated directly from identified spectral peak.
• Detection of harmonics and removal of their influence from estimated modal parameters.
• Patent protected.
• Available in Extractor Handy and Pro and Analyzer

Stochastic Subspace Identification Modal Analysis

• Basic Method: Data driven Stochastic Subspace Identification.User choices: Implementation: Unweighted Principal components, Principal Components and Canonical Variate Analysis.
• Model orders: from one mode to the size defined by the common SSI input matrix.
• Stabilization criteria: Natural frequency deviation, damping ratio deviation, mode shape MAC deviation, initial modal amplitude MAC deviation, all limits user defined.
• Physical mode separation: Damping ratio limits are user defined.
• Select and link: Modes from the models chosen from each test setups are selected and linked using snap functions and editing facilities.
• Uncertainty estimation: In case of several test setups, the empirical standard deviation is calculated for natural frequencies and damping ratios.
• Comparison: Estimated model vs. FFT based auto and cross-spectra of measurements.
• Spectra and correlation functions of prediction errors between estimated model and measurements.
• Available in Extractor Pro and Analyzer

Validation

• Modal Assurance Criterion, MAC diagrams for comparison of mode shapes between same or different estimation techniques as well as between same or different projects.
• Simultaneous animation of different mode shapes, side-by-side and overlapped.
• Animation of differences between mode shapes.
• Mode import facility using Universal File Format for comparison with e.g. FE modes.
• Available in all version of Extractor and Analyzer