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Operational Modal Analysis (OMA) is often used as an advantage when analyzing the structural dynamics of civil engineering structures, operating machinery, and other structures being difficult to excite in a controlled manner.

OMA only uses measured output response signals – no input excitation signals. When performing OMA the measured structures are brought to motion by natural loads that cannot easily be controlled and measured, such as wave loads (offshore structures), wind loads (buildings), traffic loads (bridges), or operating machine loads.

With the Dewesoft ARTeMIS OMA software, the full set of modal parameters can be estimated for such operating structures where only the output response data have been acquired. The modal parameters are the mode shapes, the natural frequencies, and the damping ratios.

Multipurpose hardware
Dewesoft supports a broad range of advanced monitoring and analysis tools that can be used while acquiring the time data. In this way, you can perform multi-physics investigations to estimate the time for maintenance and easily detect critical events.

Easy workflow
You can open time data files acquired with Dewesoft (DXD files) directly into the Dewesoft ARTeMIS OMA application and run the analysis. In the same way geometries from Dewesoft can be imported via UNV files.

OMA is not just another name for ODS (Operating Deflection Shapes) since OMA enables estimations of modal models from the operational data, whereas ODS is limited to providing deflection shapes.

OMA names
OMA is also referred to as output-only modal analysis, ambient response analysis, ambient modal analysis, in-operation modal analysis, and natural input modal analysis.

This is the core/base software pack, including the standard set of OMA functionalities. The software supports estimating natural frequencies, damping ratios, estimation and animation of mode shapes, estimation of normal mode shapes, Frequency Domain Decomposition (FDD) & Enhanced Frequency Domain Decomposition (EFDD).

Adds a second estimator (CFFD – Curve-fit Frequency Domain Decomposition) that also provides damping ratios – allowing you to make a better validation of the damping of the structure being tested.

All FDD estimators (including FFD and EFDD that are part of the core SW suite) should only be used in case of lightly damped, well-separated, and well-excited modes. I.e. modes having distinct sharp peak peaks in the frequency domain.

In addition, FDD estimators rely on the estimation of a distinct mode shape. Therefore, they should only be applied when multiple channels are measured simultaneously on the structure.

System Requirements
CPU:Intel® 64-bit processor architecture
OS:Microsoft® 64-bit Windows 10
Internet:Microsoft Internet Explorer 9 or higher
Memory:4GB of RAM (8GB or more recommended)
Space:10GB of available hard-disk space. Since the space requirement is heavily dependent on the ARTeMIS Modal projects
stored, 100GB is recommended. Storage speed can be increased by the use of a Solid State Disk (SSD).
Display:1,024×768 screen resolution or higher (recommended)



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