Flow detection method based on sound transmission signal
A technology of acoustic emission signal and flow detection, which is applied in the direction of volume/mass flow, measurement flow/mass flow, liquid/fluid solid measurement and other directions generated by mechanical effects, and can solve signal distortion, inaccurate measured signal, and flow influence Issues that cannot be ignored
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[0043]In a plexiglass tube with a length of 6000mm and an inner diameter of 50mm, a wedge-shaped blunt body with a width of 15mm is set, and water is used as the medium. , 0.637m / s, 0.708m / s, 0.778m / s, 0.849m / s. Passive acoustic emission transducers are pasted at 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, and 600mm downstream of the blunt body. The sampling frequency is 16kHz, and each sampling time is 20s. device see figure 1 .
[0044] At different liquid velocities, the acoustic emission signals of water colliding with the wall are measured by several passive acoustic emission transducers at different positions on the pipeline wall to determine the frequency of the Karman vortex street and the evolution law of the vortex. The acoustic emission signal is subjected to fast Fourier transform to obtain a spectrogram, from which the signal frequency f can be obtained. The acoustic energy is distributed along the axial direction of the pipeline...
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