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I made wrench test, knocing the block with wrench and record the signal with laptop by this simple circuit:
This is the wav file: http://www.vems.hu/files/MembersPage/ZoltanAlmasi/wrenchtest.wav And the spectrum by Spectrogram 16:
First hit the block at the bottom where the knock sensor is but opposite side, then at the middle of the bore. I can't decide the self frequency from this record. Any idea? |
