Software for Operational Modal Analysis
ARTeMIS
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Frequency Domain Operational Modal Analysis

ARTeMIS Extractor and ARTeMIS Analyzer includes up to three frequency domain modal analysis techniques derived from the patented Frequency Domain Decomposition technology utilizing the singular value decomposition of the estimated spectral densities of the measured response.

The techniques available are: ·        

All three techniques are based on peak-picking in the frequency domain using either automatic picking or manual picking using the mouse. Once picked, the mode shapes are ready for immediate animation. The techniques are all specially designed to account for the presence of deterministic signals (harmonics) in case of rotating structural parts or other sinusoidal excitation.

 













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Frequency Domain Decomposition - FDD

The FDD technique is the most user-friendly and intuitively easiest method available on the market. Pick out the resonance peaks of the modes by a click of the mouse and FDD return robust natural frequency estimates as well as high quality mode shapes, no matter how complicated the tested structure is.

Available in all versions of ARTeMIS Extractor and ARTeMIS Analyzer.

Click here to view an FDD demonstration using Preliminary Modal Analysis and Harmonic Detection.

  
Frequency Domain Decomposition with automatic peak-picking and harmonic detection enabled.

Enhanced Frequency Domain Decomposition - EFDD

From a user point-of-view the EFDD works just like the simple and efficient peak-picking FDD.  However, based on a Modal Assurance Criterion (MAC), EFDD identifies the top part of the auto-spectral density of the Single-Degree-Of-Freedom (SDOF) system of the picked mode.

By transforming the auto-spectral density SDOF function to a time domain free decay by inverse FFT, the natural frequency and damping ratio are obtained by estimation in time domain.  

Mode shapes are obtained by averaging directly in frequency domain using the identified part of the auto-spectral function and the corresponding singular value decomposition of the spectral matrices.

Available in Handy and Pro versions of ARTeMIS Extractor and ARTeMIS Analyzer.

 

  
Automatic EFDD estimation of natural frequency and damping ratio from a time domain free decay in presence of harmonics.
Curve-fit Frequency Domain Decomposition - CFDD

CFDD utilize the MAC criterion in the same way as EFDD to find the top part of the auto spectral density function of the SDOF system of a mode.

The auto-spectral function is the curve-fitted directly in the frequency domain using a SDOF curve-fitter to produce high-quality estimates of the natural frequency and damping ratio. This makes the CFDD an extremely easy technique as no time domain displays are needed.

The mode shape is estimated in the same way as in EFDD.

Available in Handy and Pro versions of ARTeMIS Extractor and ARTeMIS Analyzer.

 

  
Automatic CFDD curve-fitting of auto spectral density directly in frequency domain.

 

  
 

Structural Vibration Solutions A/S • Tel: +45 9635 4422 • Fax: +45 9635 4575 • svibs@svibs.com