You might wonder what Operational Modal Analysis, OMA, is and how it differs from the traditional Experimental Modal Analysis (EMA) that has been around for the past few decades. Operational Modal Analysis is also called output-only modal analysis, ambient response analysis, ambient modal analysis, in-operation modal analysis, and natural input modal analysis.
All methods for Experimental Modal Analysis in ARTeMIS Modal are born multiple input multiple output polyreference methods. This means that the techniques are capable of estimating closely space modes and even repeated modes with a high degree of accuracy. Below there is an example of a perfectly symmetric structure where the polyreference methods have been applied on a setup with two reference accelerometers and a rowing impact hammer.
ARTeMIS Modal Pro has a series of plugin modules designed for Structural Health Monitoring purposes. All modules are designed to analyse and present the health of a monitored structure in various manners, and they all rely on the same common data manager base module. This module administrates the recorded measurement files as well as the results obtained during a periodic monitoring.
There are different ways to handle the problems arising from the harmonic components in the vibration measurements.
ARTeMIS Modal now includes plugins that enable direct control of data acquisition modules. This allow recorded measurements to be directly saved into the active project.
All versions of ARTeMIS Modal support the Harmonic Detection and Removal (HDR) plugin that enables detection and possible removal of harmonic components present in the response measurements used for Operational Modal Analysis.
Back in the 1980’s civil engineers were among the first to adapt Operational Modal Analysis (OMA) for testing of large structures. The size of the civil engineering structures and the fact that ambient excitation typically is uncontrollable pushed the development of OMA techniques heavily in this area. Today OMA is a wide spread technology used in many engineering field but testing of civil engineering structures is still the most popular OMA application. Back in 1999, ARTeMIS software was originally...