ARTeMIS Modal Analysis Software

Structural Dynamics

ARTeMIS Operational Modal Analysis Software

Structural Vibration Investigation, Monitoring and Analysis

 

 

You might wonder what Operational Modal Analysis, OMA, is and how it differs from the traditional Experimental Modal Analysis (EMA) that has been around for the last decades. Operational Modal Analysis is also called output-only modal analysis, ambient response analysis, ambient modal analysis, in-operation modal analysis, and natural input modal analysis. No matter which name that is used the idea is the same: To do modal analysis without knowing and/or controlling the input excitation. This modal technology is capable of estimating the same modal parameters as the traditional known techniques. The modal parameters are the mode shape, the natural frequency and the damping ratio. Some thinks that Operational Modal Analysis just is another name for Operating Deflection Shapes, ODS. This is not the case. Operational Modal Analysis separates noise and input and returns the modal information only.

There are a number of benefits in using the Operational Modal Analysis compared to the more traditional techniques.

Easier Laboratory Modal Testing

There is no need for vibration shaker or impact hammer anymore. If you are in your lab doing modal testing in a test rig on some structural component, just do some random tapping on the structure while you are measuring the vibration response in multiple locations. The tapping must be random in time but also spatially. The excitation produced in this way will be a good approximation of a multivariate white noise stochastic process.

Winning Technology in In-situ Modal Testing

Vibration shakers and impact hammers are impossible as excitation sources when it comes to insitu testing of structures, such as buildings or rotating machinery. In cases like this the traditional modal analysis fails, because there are a number of unknown inputs acting on the structures. What is a problem for traditional modal analysis is a strength for Operational Modal Analysis. The more random input sources there are the better the modal results gets. Since the real strength of the technology really lies in the in-situ testing it is no wonder why the technology is called Operational Modal Analysis. Another important feature that comes for free is that the estimated modes are based on true boundary conditions, and the actual ambient excitation sources.

ARTeMIS Modal is produced in three versions and the key features are listed below. All versions have estimators for Operational Modal Analysis (OMA), Experimental Modal Analysis (EMA) and Operating Deflection Shapes (ODS). As optional feature for all versions is the Data Acquisition plugin, allowing direct control of selected data acquisition hardware.

ARTeMIS Modal Basic

This is the basic version having a frequency domain method for Operational Modal Analysis. Specifically it contains the following tasks and features:

  • Prepare Geometry Task.
    • Import/modify existing geometry.
    • Create geometry from scratch using interactive tools.
  • Manage Measurements Task.
    • Import/merge measurements file into single or multiple test setups.
    • View imported measurements channel by channel.
    • Edit imported measurements. Truncation, differentiation or integration.
    • Connect/disconnect channels and Test Setups.
  • Assign DOF Information Task.
    • Link channels with geometry nodes and directions.
    • Link using drag-and-drop or by direct editing.
    • Automatic identification of reference channels.
  • Prepare Data Task.
    • Configure all preprocessing of measurements.
    • Repair measurements having severe outliers.
    • View processed data of channels and Test Setups.
    • Compare processed data of reference channels.
  • Estimation Task.
  • Report Task.
    • Easy selection of graphics and tables.
    • Seamless integration – Microsoft® Office 2000, XP, 2003, 2007, 2010 and 2016 32bit/64bit.
    • Generate Word documents and Power Point presentations.
    • Predefined standard templates.

ARTeMIS Modal Standard

This is the mid-size version having three frequency domain methods for operational modal analysis. Besides all the tasks and features of the Basic version above, this version has the following additional tasks and features:

  • Prepare Data Task.
  • Estimation Task.
  • Validation Task.
    • Overlaid mode shapes animation.
    • Mode shapes difference animation.
    • Mode shapes side-by-side / top-bottom animation.
    • Modal Assurance Criterion.
    • Comparison between estimated and imported modes.
    • Frequency versus Damping diagrams.

 

ARTeMIS Modal Pro

The ultimate tool having all the features developed over the last two decades. It has up to eight operational modal analysis methods and supports several plugins for e.g. automatic file upload, automatic modal estimation and damage detection. Besides all the tasks and features of the Basic and Standard versions above, this version has the following additional tasks and features:

  • Prepare Data Task.
    • Peak Reduction. Reduce or eliminate harmonic peaks and/or unwanted modes.
  • Estimation Task.
  • Optional Plugin Modules for Structural Health Monitoring.
    • Data Manager Base Module including Historical Measurement Statistics and 3D Data View.
    • Damage Detection, Classic and Robust methods as well as unifying Hotelling Control Chart.
    • Modal Parameter History including automatic mode tracking and tracked modes export.
    • Interstorey Drift Analysis. Estimation of relative interstorey drift in multiple locations.
    • Automatic File Upload. Upload files automatically from a designated folder and optionally perform modal analysis and damage detection.

With our flexible upgrade policy you can get started in an affordable way, and then upgrade whenever needed.

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