Abstract
The measurement of noise in liquid flow is a complicated technical problem. That is why such types of measurements are rarely used for industrial equipment diagnostics. Partially, these measurements can be substituted by the measurements of pipe wall random vibration, which is excited in long pipelines mainly by the pseudosound in the boundary layer of the liquid. The analysis of the processes that modulate the pipeline vibration enables us to solve several problems of practical diagnostics. In particular, defects can be detected in the flow generating machines and in the distribution systems, the low frequency longitudinal oscillations of the liquid in the flow can be investigated, the self-excitation processes can be detected. To solve these problems it is sufficient to measure the envelope spectrum of the high frequency random vibration at different points on the outer wall of the pipeline. It enables detection of the harmonical and random pulsation of the flow speed, exceeding 0.1% of the mean flow speed.
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