Operational Modal Analysis

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without the need to measure the forces on structure?

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Operational Modal Analysis (OMA)

Operational Modal Analysis (OMA) is a technique used to identify the modal parameters (natural frequencies, damping, and mode shapes) of a structure or object while it is in operation. OMA is part of a group of techniques used to study the dynamics of a structure.

Unlike other techniques that are typically conducted in controlled environments like laboratories or with specific boundary conditions, OMA is performed in-situ under real-world load conditions. This ensures that the forces acting on the structure are realistic in terms of level, location/direction of application, and frequency/order content.

However, conducting the test during operation means that the input forces cannot be quantified as they can be in other techniques. OMA is a response-only technique, which means that no input forces are measured during the test.

There are three main benefits/reasons to perform a modal analysis during operation:

1. Real-world operational conditions differ significantly from laboratory conditions.

2. Practical and size limitations.

3. Ongoing health monitoring and damage detection.