System for multi-reference sine or hammer excitation
LMS Test.Lab MIMO Sine Testing provides a complete solution for FRF-based modeling of large and complex structures that are difficult to excite with sufficient energy using broadband excitation techniques. The applications range from measuring frequency response functions for path contribution analysis, over point mobility measurements of component attachment points for design verification to complex stiffness measurements of mounts and bushings. The Frequency Response Functions are measured using swept sine excitation, but can also be measured using traditional impact hammer testing. Up to 4 shakers - or alternatively 4 volume velocity sources for reciprocal FRF measurements – are supported, while the responses are measured for up to 24 simultaneous channels. All channels support ICP transducers or any Voltage signal.
By exciting the structure with a sweeping sine, the MIMO Sine Testing workbook combines the high signal-to-noise ratio of sine excitation with the measurement speed of broadband testing. During MIMO testing, multiple sine sweeps with different phase conditions between the averages provide correct frequency response functions. Accurate sine extraction results in leakage-free response spectra, while a system identification step prior to the sine sweep allows to control the excitation levels and further increase the dynamic range of the 24-bit A/D converters. Harmonic distortion spectra and excitation level control following a reference profile allows to gain insights in the structure’s non-linear behaviour. The Modal Impact workbook provides embedded expert guidance for trigger parameter setting and FFT-window selection, with immediate feedback showing the effect of parameters changes on your last measurement. Both workbooks support automatic active channel detection thus providing one-man calibration functionality.
All LMS Test.Lab Desktop documentation and reporting functionality, including Active Pictures, is supported.
