Software for Operational
Modal Analysis
ARTeMIS 


Technical Specifications for the ARTeMIS
Modal 5
System
Requirements
ARTeMIS Modal is a
software platform designed for Microsoft Windows 64 bit operating systems. To increase speed it makes
use of mathematical libraries from Intel. The help system is web based, so
maximum performance is obtained by having a internet connection. Help system
can be downloaded to the local computer if necessary.

Intel® 64bit processor
architecture

Microsoft® 64bit
Windows 7/10

Microsoft Internet
Explorer 9 or higher

4GB of RAM (8GB
or more recommended)

10GB of available
harddisk space. Since the space requirement is heavily
dependent on the ARTeMIS Modal projects stored, 100GB is
recommended

1,024x768 screen
resolution or higher (recommended)

Internet connection required for installation

Activation require a
license file that will be sent by email.

The software support the following license models:
Nodelocked to a specific computer, locked to a specific USB
dongle, locked to a specific license server located on the
Local Area Network. In case a license server is used, the
licenses can be checked out for a period of up to 30 days
for a specific computer that needs to work disconnected from
the network.
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 subelements
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.
 Drawing of high level objects both
in cartesian and cylindrical coordinate systems.
 Operated through the Prepare
Geometry Task.
Data Input
 Import through either the user
interface, SVS Configuration File format, or Universal File
Format.
 Universal File Format (UFF, UNV) ASCII
as well as binary import of measured time series.
 SVS Configuration File format and
data files: Text (TXT and ASC), SVS binary format (BIN), Header File
Formats (TEAC HDR, GeoSIG GHF, Diadem, Kyowa), Kinemetrics
Altus (EVT), MS Wave file format (WAV), Weir Jones format
(TAD), VDAS
input format (VIF), National Instruments formats (LVM, TDM, TDMS), Matlab
Format (MAT), Catman format, SoMAT format
(SIE), SAC and MiniSEED seimic formats. 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. Matlab mfile delivered as example.
 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 draganddrop 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.
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.
 Report generator for easy creation
of Microsoft Office documents (Word & Power Point). Require
the installation of Microsoft Office.
 SVS Configuration File Format (CFG
extension): Geometry and DOF information is written directly
in this file along with references to the required
measurement 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.
Signal Processing
 Decimation, 11000 times, digital
antialiasing filter, cutoff at 0.8 times Nyquist frequency
of decimated signals.
 Filtering: lowpass, highpass,
bandpass, bandstop Butterworth, filter order 150 poles,
arbitrary cutoff 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. Automatic
detection of the required number of Projection Channels as
well as what channels to pick. Specific channels can as
option be selected explictly.
 Spectral estimation using FFT and
Welch’s averaged periodogram method. Data segment length:
radix2 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 Modal (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 and annotation support 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.
 Operated through the Prepare Data
Task.
Operating Deflection Shapes
 Frequency domain animation of all
test setups using multiple references shape estimation.
 Time domain animation of
individual test setups.
 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.
 Operated through the Estimation Task
as FrequencyODS or TimeODS.
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.
 Operated through the Estimation Task
as FDD.
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.
 Operated through the Estimation Task
as EFDD.
Curvefit 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.
 Operated through the Estimation Task
as CFDD.
Stochastic Subspace Identification Modal Analysis
 Basic Method: Data driven
Stochastic Subspace Identification.
 User choices:
Implementation: Extended Unweighted Principal components, Unweighted Principal components, Principal
Components and Canonical Variate Analysis. Estimation: Standard Least Squares or
Crystal Clear SSI.
 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
Extended Unweighted Principal components uncertainties are
estimated for natural frequencies and damping ratios.
 Can estimate negative damping if
necessary.
 Can estimate uncertanties of modal
parameters.
 Comparison: Estimated model vs.
FFT based auto and crossspectra of measurements.
 Spectral density functions
of response and prediction errors between estimated model and
measurements.
 Operated through the Estimation Task
as SSIUPC, SSIUPCX, SSIPC, SSICVA, SSIUPCMerged.
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.
 Complexity plot and complexity
values of mode shapes.
 Simultaneous animation of
different mode shapes, sidebyside and overlapped.
 Animation of differences between
mode shapes.
 Frequency versus Damping diagrams
presentingdamping ratios as a function of naturla
frequencies. Optionally, also confidence ellipsoids
(SSIUPCX).
 Mode import facility using
Universal File Format for comparison with e.g. FE modes.
 Operated through the Validation
Task.
Plugin to ARTeMIS Modal Pro  Data Manager Base
Module
 Support for
Multiple Analysis Sessions.
 External storage with saving and
loading of measurements and results for each Analysis
Session.
 Historical
measurement statistics (Maximum, Minimum, RMS, Median, Mean,
Variance, Skewness, Kurtosis).
 Master Session
definition, allowing automatic processing across all Analysis
Sessions using settings of the Master Session. Includes
automatic SSI modal estimation.
 Notification
(Alert) services. Visual, sound, email, web service.
Plugin to ARTeMIS Modal Pro  Automatic File Upload
Module
Plugin to ARTeMIS Modal Pro  Damage Detection
Module
Plugin to ARTeMIS Modal Pro 
Modal Parameter History
Module
 Historical presentation of natural
frequencies and damping ratios.

Historical export of modal parameters to SVS and UFF file
formats.
 Automatic mode tracking based on the estimation of a set
of reference modes obtained from a specified set of
reference Analysis Sessions.
 Historical presentation of the tracked modes (Drawn
interconnected). Natural frequencies and damping ratios 
absolute and relative to their reference mode. Modal
Assurance Criterion of the mode shapes relative to the mode
shape of their reference mode.
 Historical export of tracked modes to SVS and UFF file
formats.
Plugin to ARTeMIS Modal  Data Acquisition
Module
 Direct control of National
Instrument acquisition module that can be controlled using
NIDAQmx driver.

Direct control of SINUS Messtechnik Apollo acquisition
module.
 Seamless integration with all other tasks in ARTeMIS
Modal.
 Direct streaming of measurements to ARTeMIS Modal test
setups.
 View acquired time series realtime of user selectable
channels.
 Onthefly calculation of spectral densities and
singular value decomposition (SVD) of spectral densities.
 Support IEPE sensors with or without TEDS.
 Multiple recording modes: Manual start/stop, predefined
interval of time, triggered start.
 Works with all versions of ARTeMIS Modal (Basic, STD,
Pro)
