Operational Modal Analysis

LMS Test.Lab Operational Modal Analysis provides an in-operation testing solution for modal parameter identification, starting from user-selected segments of time data measured on a structure in operating conditions. Time histories are measured with the LMS Test.Lab Parallel Time Recording option of acquisition applications. Any subset of this time data can be used as a reference for the operational modal analysis to obtain optimal reference locations of all excited modes. The hardware configuration can be adapted for either in-vehicle tests or tests of large objects such as bridges, buildings and airplanes. 

Time histories for all channels are directly written to the PC hard disc, simultaneously with the online spectral processing and a throughput performance independent of channel count, acquisition bandwidth, or online processing. 

LMS Test.Lab Operational Modal Analysis extracts modal parameters from response time measurements and further provides a modal model validation tool set, data synthesis and mode shape visualization. The solution offers a convenient overview of all input time histories, and helps easy selection of specific data segments. 

LMS Test.Lab Operational Modal Analysis can be combined with other LMS Test.Lab applications for faster data interpretation and analysis.

With the clear stabilization diagrams from the LMS Test.Lab PolyMAX parameter estimation algorithm and the automatic modal parameter selection (AMPS), the analysis process is simplified and operator-dependency of the resulting modal model is eliminated.

LMS Test.Lab Spectral Testing gives feedback on defined parameters, with maximum validation of the test setup before the actual testing starts. During measurements, any processing function can be displayed and monitored online, while additional information such as rotational speed can also be checked. 

When performing operational modal analysis on structures with rotating components, such as helicopters or rotating machinery, component harmonics could influence the test results. With the LMS Test.Lab Harmonic Removal add-in, the harmonic contents from the time data can be filtered out.

LMS Test.Lab Operational Deflection Shapes and Time Animation, LMS Test.Lab Operational Modal Analysis and LMS Test.Lab Geometry are available as stand-alone analysis environments or as add-ins to LMS Test.Lab Spectral Acquisition.