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.

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

structural dynamics

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

PULSE TYPE 8760 + 8762

Operational Modal Analysis (OMA) Software

Operational modal analysis software for post-measurement modal analysis of structures under operating conditions without artificially exciting the structure.

BZ-8550 - BZ-8554

Structural Health Monitoring

Structures degrade over time due to usage, harsh environmental conditions and accidental events. Performing long-term, continuous structural health monitoring makes it possible to monitor a structure’s state and carry out condition-based maintenance to ensure structural integrity.

BK CONNECT - TYPE 8410-C

ODS Analysis Software

Intuitive ODS analysis software for determining and visualizing the vibrational pattern of a structure under given operating conditions. The analysis software provides an in-depth understanding of a structure under operating conditions, required to improve the structural health.

TYPE 4507-B

Piezoelectric CCLD Accelerometer, TEDS, 1 mV/g, Side Connector, 1 Slot, Excl. Cable

Designed for modal analysis measurements.

TYPE 4524-B

Triaxial CCLD Piezoelectric Accelerometer, TEDS

Designed for structural analysis measurements.

TYPE 8340

CCLD Seismic Accelerometer with Top Connector

Seismic Accelerometer designed with high sensitivity and ideal for large structures (at very low frequencies), measuring low-level seismic activity.

TYPE 8344

Piezoelectric DeltaShear Accelerometer with TEDS

DeltaShear® Accelerometer Type 8344 features TEDS, and is designed for low-level measurement, low noise and high sensitivity.

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