Low-Frequency Acoustic Signals Propagation in Buried Pipelines

3rd All-Russian Scientific and Practical Conference on Innovations in Non-Destructive Testing

Ovchinnikov, A.L.^1 ; Lapshin, B.M.^2

OOO Fonon Research and Production Company, Tomsk, Russia^1

Institute of Non-destructive Testing, National Research Tomsk Polytechnic University, Tomsk, Russia^2

关键词: Acoustic signals;    Attenuation coefficient;    Buried pipelines;    Internal energies;    Low-frequency acoustic signals;    Mechanical action;    Numerical values;    Signal attenuation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/671/1/012031/pdf
DOI  :  10.1088/1742-6596/671/1/012031

来源: IOP

【 摘 要 】

The article deals with the issues concerning acoustic signals propagation in the large-diameter oil pipelines caused by mechanical action on the pipe body. Various mechanisms of signals attenuation are discussed. It is shown that the calculation of the attenuation caused only by internal energy loss, i.e, the presence of viscosity, thermal conductivity and liquid pipeline wall friction lead to low results. The results of experimental studies, carried out using the existing pipeline with a diameter of 1200 mm. are shown. It is experimentally proved that the main mechanism of signal attenuation is the energy emission into the environment. The numerical values of attenuation coefficients that are 0,14- 0.18 dB/m for the pipeline of 1200 mm in diameter, in the frequency range from 50 Hz to 500 Hz, are determined.