KEYWORDS: Signal processing, Testing and analysis, Vibrometry, Beam shaping, Shape analysis, Finite element methods, Doppler effect, Data acquisition, Linear filtering, Lasers
A high precision and fast testing method for pure modal of vibration body by continuous constant speed plane scanning vibration measurement using single point laser doppler vibrometer is proposed. Thin-walled beam as test object, single point laser continuous plane scanning vibration measurement modal testing scheme is proposed. The processing method for the actual vibration signal is investigated, and the calculating method for the upper and lower alternate envelope of vibration displacement signal is proposed. Thin-walled beam as test object, The modal test platform based on single point laser continuous constant speed plane scanning vibration measurement is put up, and the validity of the modal testing method is verified by the modal testing of thin sheet beam.
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