Abstract
In the near future, it is expected that the number of decrepit fishing port facilities will be increasing. So far, simple investigations by visual checks are used as a major diagnosis method for fishing port facilities, however, visual checks are considered to be time-consuming and cost-ineffective. Also, the accuracy of visual checks is highly dependent on the judgements made by respective technicians.
In this study, we used the measurement technique deploying the input points and measurement points face-to-face to understand the inner defects of fishing port facilities and examined the availability for soundness diagnosis. In the laboratory experiment, we prepared specimens with inner defects and measured elastic waves in both sound and unsound parts of the specimens. The results showed that the elastic wave velocity and power transmission ratio significantly changed with or without inner defects. We confirmed that inner defects of the specimens were detectable at the intersection when the elastic wave velocity was 4,400m/s and the power transmission ratio was 10.0dB. We also confirmed that the applicability of the method based on the results of the on-site experiment using the same method as the laboratory experiment.
