Analisi Modale Operativa

Operational Modal Analysis (OMA)

Operational Modal Analysis (OMA) is used instead of classical modal analysis for accurate modal parameter identification of structures under actual operating conditions, and in situations where it is difficult or impossible to artificially excite the structure.

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In Operational Modal Analysis (OMA), only the output of a structure is measured using the natural ambient and operating forces as unmeasured input.

Many civil engineering and mechanical structures are difficult to excite artificially due to their physical size, shape or location. Civil engineering structures are also loaded by ambient forces such as the waves against offshore structures, the wind on buildings, and traffic on bridges, while mechanical structures such as aircraft, vehicles, ships and machinery exhibit self-generated vibration during operation.

In Operational Modal Analysis, these forces, which would produce erroneous results in classical modal analysis, are instead harnessed as input forces. As Operational Modal Analysis can be performed in situ during normal operation, setup time is reduced, and downtime can be eliminated.

System suggestion

Operational modal analysis system overview

For an integrated, easy-to-use modal test and analysis system, use BK Connect® Time Data Recorder for geometry-guided data acquisition, and then transfer data to PULSE Operational Modal Analysis software for analysis and validation.

To achieve the optimal OMA solution, you can select from Brüel & Kjær’s complete measurement and analysis chain including accelerometers, LAN-XI data acquisition hardware and measurement and post-processing software. 

Video: Brüel & Kjær Operational Modal Analysis


Niels-Jørgen Jacobsen
Product Manager - Structural Dynamics Solutions

[email protected]

IOMAC promotion

IOMAC 2022 – Reaching Beyond Borders
Operational modal analysis (OMA) knows no boundaries, physical or intellectual, and offers a tremendous opportunity to explore new applications of the technology. That’s why researchers, practicing engineers and technicians, students, equipment manufacturers and software developers will once again gather in-person at the International Operational Modal Analysis Conference in July 2022 in Vancouver to share knowledge, and present new research and advances in the applicability of OMA in various fields.

As one of the three founding members of IOMAC, HBK is proud to be present with an exhibition booth, various technical conference presentations as well as offering a two-day pre-conference workshop on OMA.

Would you also like to be there in 2022 and are you interested in participating in the pre-conference workshop, the conference itself or as an exhibitor? Find out more about IOMAC and the content of our workshop. Also, check out the exhibition opportunities on offer.

We look forward to seeing you!



Pre-conference workshop on OMA

HBK experts Niels-Jørgen Jacobsen, Product Manager – Structural Dynamics Solutions and Naira Costa, Sound and Vibration Trainer HBK Academy, look forward to meeting up in Vancouver, in person, in July to present their respective papers.

These are:

  • ‘A general framework for damage detection with statistical distance measures: application on civil engineering structures’, presented by Niels-Jørgen Jacobsen, HBK Denmark
  • ‘Experimental study measuring the effect of the different speed in the helicopter blade modal parameters using OMA’, presented by Naira Costa, HBK Denmark

Plus paper co-authored by HBK’s Niels-Jørgen Jacobsen:

  • ‘Statistical damage detection and localization with Mahalanobis distance applied to modal parameters’, presented by Postdoc Szymon Grés, ETH Zürich, Switzerland. 


Exhibition opportunities

IOMAC Conference