Polytec expands modal test solution portfolio

With its PSV scanning vibrometer product family and PolyWave modal analysis software, Polytec offers complete solutions for experimental modal testing. Now, the specialist for optical vibration measurement has extended its range of development tools with the Qsources high-frequency shakers for efficient structural excitation.

The Qsources Qlws LightWeightShaker excites structures consistently up to 13,000 Hz with a minimal footprint. Although the shaker is permanently attached to the structure, thus requiring no support structure, it effectively contributes only 1.8 g to the mass. “In addition, the Qsources shaker has only minimal effect on the stiffness and thus fits into the measurement chain of the reactionless laser Doppler vibrometer,” the company states. The inertial mass is dynamically decoupled from the stinger by a patented internal suspension. The generated force is given by the stinger and is thus perpendicular to the surface. A single-axis IEPE force sensor is integrated into the inertial mass for transfer function measurements.

The shaker concept suits not only experimental modal analysis tests for FE model correlation but also dynamic substructuring, which is increasingly in focus, as well as acoustic optimization. The design of the Qlws LightWeightShaker allows it to be used in all directions. Using multiple shakers driven by uncorrelated signals synchronously allows for the excitation of all modes in an experimental modal test. Using the triaxial scanning vibrometer PSV QTec 3D, transfer functions of such multiple-input multiple-output (MIMO) tests are assigned to the individual shakers using principal component analysis (PMA). Tube / Hall 7a / E19

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