Effective Method of Pipeline Transport Monitoring

A method for remote monitoring of the condition of gas and oil pipelines is proposed. It is based on the excitation of low-frequency vibrations in the pipeline wall. By using a bispectral approach, the recorded signal is transformed into graphical elements on a plane. This approach allows visualizing the control of signal changes by transforming the original amplitude-time signal into a specific point in two-dimensional space. The object of this study is a two-layer pipe, consisting of two pipes rigidly coupled. The outer pipe is intact, while the inner pipe contains a defect in the form of a through hole. The process of changing the condition of the pipe is simulated by changing the position of the inner pipe, weakened by the presence of a defect, within the outer pipe. The sizes of the pipes ensure their close contact with each other; on the other hand, they allow the movement of the defect location. Changing the position of the defect allows changing the parameters of the system and thus affecting the structure of the surface wave field. The aim of the study is to develop a method for detecting changes in the position of the defect by changes in the surface wave field. The proposed method allows visualizing the control of changes in the position of the defect. Any change in the position of the defect leads to a change in the position of the point in feature space. This makes it possible to monitor changes in defect parameters based on the position of the point on the plane. The conducted research have established a high sensitivity of the proposed approach to changes in damage to the pipe wall.