Modal tests are normally executed in controlled conditions: in the laboratory, clamped or suspended, applying known low-level force inputs. However, this can be problematic for structures that cannot be brought into the laboratory, because they are too large or already in use.
LMS Test.Lab Operational Modal Analysis solutions allow engineers to diagnose vibration and acoustic problems on structures in operation (such as buildings, bridges, vehicles, etc.) or on structures where real life operations differ very much from conditions in the test laboratory. For example, the dynamic properties of an airplane are very different in the air, when the wings are supporting the body, compared to on the ground, when the body and the landing gear support the wings.
With the LMS Test.Lab Operational Modal Analysis tools, measurements taken while the structure is in operation, result in a full set of modal parameters – resonance frequencies, mode shapes and damping values. These parameters allow engineers to enhance the vibration and acoustic comfort of the end product, increase its durability and improve the efficiency of the development process by enhancing numerical models with test results, e.g. using Finite Element Model updating.
- Multi-channel system yields maximum data consistency
- Performs operational modal analysis for well-defined operating conditions
- Finds operational modes even if hidden in background levels, thanks to advanced time data processing and parameter extraction methods
- Compares time animation with qualitative and quantitative operational modal analysis results
- Annotates all data with any kind of information describing the operating conditions
