Operational Modal Analysis (OMA) is a technique used to identify the dynamic properties of structures such as natural frequencies, damping ratios, and mode shapes using vibration measurements collected under operational or ambient excitation.
Unlike Experimental Modal Analysis (EMA), OMA does not require controlled input forces. Instead, modal parameters are estimated from response-only data using advanced system identification methods.
OMA is widely used in structural dynamics and structural health monitoring
Operational Modal Analysis is based on measuring the response of a structure while it is in operation.
The process typically involves:
These steps allow engineers to characterize the dynamic behaviour of structures without interrupting their operation.
Operational Modal Analysis is typically used when controlled excitation is impractical or impossible.
Common applications include:
In these cases, excitation is provided by ambient sources such as wind, waves, traffic, or operational loads.
OMA relies on several well-established algorithms, including:
These methods enable accurate estimation of modal parameters from output-only measurements.
Operational Modal Analysis is typically performed using specialized software tools designed for modal parameter estimation from response-only data.
These methods are implemented in dedicated OMA software such as ARTeMIS Modal Pro, which provides tools for modal identification, validation, and visualization.
