Precise structural vibrational measurement data are needed in many application areas, e.g. for experimental modal analysis, FEM correlation and structure borne sound analysis. The targets of the respective experimental structural dynamics investigations are - high density measurement grids for high spatial resolution - no mass-loading of the structure during the measurement process for reliable data - short setup and measurement time for highest efficiency in the product development workflow. All of these requirements, which are mutually exclusive for conventional sensor technology, are fulfilled by 3-D Scanning Laser-Doppler Vibrometry. The Polytec PSV-400-3D 3D Scanning Vibrometer proves to be very well suited for data acquisition for structural dynamics tests on car bodies. The main advantages as compared to conventional accelerometers are: Significant decrease of test time. Higher point density allows more meaningful results. Measurements exactly at coordinates of FE-model possible by geometry import. No alteration of structure (no change of mass or stiffness) and therefore easier and better FEM-correlation. Ease of setup (no cabling or labeling). No error checking of cabling. No moving of accelerometers and dummy masses. Software easy to learn and system easy to use Lower maintenance costs - only one transducer to recalibrate. In this contribution typical application examples are used to demonstrate the capabilities and benefits of these non-contact optical technology for the measurement of structural vibrations.
3-D scanning vibrometry - an indispensable measurement tool for efficient experimental modal analysis and FEM correlation
3D-Rastervibrometrie - ein unentbehrliches Messinstrument für die effiziente experimentelle Modalanalyse und FEM-Korrelation
2006
10 Seiten, 10 Bilder, 1 Tabelle
Conference paper
English
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