LMS Test.Lab MIMO Sine Sweep Testing provides a complete solution for FRF-based modeling of large and complex structures that are difficult to excite with sufficient energy. It uses broadband excitation techniques and its applications range from measuring frequency response functions for path contribution analysis, point mobility measurements of component attachment points to complex stiffness measurements of mounts and bushings.
By exciting the structure with a sweeping sine, LMS Test.Lab MIMO Sine Sweep Testing combines the high signal-to-noise ratio of sine excitation with broadband testing measurement speed. During MIMO testing, multiple sine sweeps with different phase conditions between the averages give correct frequency response functions. Accurate sine extraction results in leakage-free response spectra, while a system identification step prior to the sine sweep helps control excitation levels and increase the dynamic range of the 24-bit A/D converters. Harmonic distortion spectra and excitation level control following a reference profile provide insight into the structure’s nonlinear behavior.
LMS Test.Lab MIMO Sine Sweep Testing is designed to measure the structure’s response at different points to a controlled sinusoidal excitation. The solution offers an intuitive way to define channel and acquisition parameters as well as process functions. In all stages, the user receives feedback on the defined parameters, so that the test setup can be maximally validated before the actual testing starts. A system identification procedure helps determine a first system FRF matrix estimate using periodic random excitation and predicts response levels on all channels for the sinusoidal excitation. During the actual measurements, all relevant information can be displayed and monitored online. A specific validation sheet gives an overview of the measured DOFs as well as their position on the structure.
LMS Test.Lab MIMO Sine Sweep Testing can be combined with LMS Test.Lab Operational Deflection Shapes and Time Animation, LMS Test.Lab Modal Analysis or LMS Test.Lab Geometry for faster data interpretation and analysis. The applications are available as stand-alone analysis environments or as add-ins to LMS Test.Lab MIMO Sine Sweep Testing.
