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Wednesday, July 10 • 10:30 - 13:00

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Many of modern specialized structures are built to have high rigidity and very low weight, which comes at a cost of their high fragility. This makes it very difficult to measure with traditional methods where both excitation and the measurement require physical contact with the sample. The Experimental Modal Analysis measurement technique is performed to confirm or discard the Finite Element Analysis in the case of complex structures and often to calculate some of material properties. In the case of ultra-lightweight structures, standard contact measurements based on accelerometers is not possible due to the mass ratio between the accelerometers and the structure itself. Moreover it may be destructive to the sample to use the traditional excitation source like a shaker or a modal hammer. In such a case, the loudspeaker maybe a valid source of excitation and the vibration of the structure can be measured based on the Doppler shift of the laser beam reflected off the vibrating surface. This paper details the functioning and application of a 3D Scanning Vibrometry System, which utilizes the fore-mentioned non-contact method. This approach allows for full non-contact excitation and measurements for modal analysis of specialized structures. The results of the Experimental Modal Analysis of selected lightweight composite structures using this instrument are also presented and discussed.

Wednesday July 10, 2019 10:30 - 13:00 EDT
St-Laurent 3, Board 07-B
  T07 Struct. dyn. & nonlin. vib., RS01 Modal analysis