Operational Modal Analysis (OMA) and Experimental Modal Analysis (EMA) are two techniques used to identify the dynamic properties of structures, including natural frequencies, damping ratios, and mode shapes.
The main difference between the two methods is how the structure is excited.
| Parameter | OMA | EMA |
|---|---|---|
| Excitation | Ambient / operational | Controlled input |
| Measurements | Response only | Input and response |
| Test setup | Minimal | Requires excitation equipment and a test-rig |
| Typical use | Large structures | Components and smaller structures |
Operational Modal Analysis is typically used when:
Typical applications include bridges, wind turbines, dams, and buildings.
Experimental Modal Analysis is typically used when:
Typical applications include mechanical components and laboratory testing.
The choice between OMA and EMA depends on the structure, test conditions, and analysis objectives.
In many cases, the two methods can be complementary, with OMA used for in-operation testing and EMA used for controlled validation or detailed investigations.
Both OMA and EMA require specialized modal analysis software.
These methods are implemented in software platforms such as ARTeMIS Modal Pro, which supports both Operational and Experimental Modal Analysis workflows, including modal parameter estimation, validation, and visualization.
