A Study of Diagnosis Technique Using Shear Wave Resonating Method for Irrigation Pipelines

Abstract

Recently, the irrigation pipelines gradually lose its performance due to the deterioration and other factors, and the replacement or the improvement are required. It is necessary to develop a diagnosis technique which is advantage in the cost in order to maintain the performance of the pipeline. In the present study, in order to discuss the application of a shear wave resonating method to the diagnosis technique for ductile iron pipes, several experiments were carried out using an examination object in which the corrosion was simulated. As a result, it is found that the corrosion can be detected by comparing the measurement wave form of normal part and damage part. In addition, in order to evaluate the deterioration degree, the classification method has been proposed on the basis of the power spectrum by the plurality of frequency bands.