Possibility of gravel mass estimation by pulse-type hydrophone
2018
Takaki, K. (Institute for Rural Engineering, National Agriculture and Food Research Organization, Tsukuba-shi, Ibaraki (Japan)) | Mukai, A. | Tanaka, Y. | Tsunesumi, N.
There are growing concerns about functional deterioration due to wear damage by gravel in concrete agricultural channels. This paper presents the possibility of gravel mass estimation by the pulse-type hydrophone as one of the monitoring and diagnostic techniques contributing to their lifetime prolongation. The precedented formulation for gravel size estimation, as an inverse problem, has difficulty in physical and mathematical handling, and its routine application was impossible in a practical way. Therefore, by means of the analysis of the relation between gravel mass and sound pressure obtained from the results of experiments, we proposed the modeling procedure to be able to evade those ill-posedness. Based on the procedure, we developed the model which classifies the gravel mass into two classes from the observed pulse number of sound pressure divided in two classes. Consequently, it could give largely successful classified results for a group of gravel within a certain mass distribution.
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