Abstract
In the nuclear power plant, where many small-bore piping connected to vibrational sources like pumps, it is important to evaluate vibrational stress efficiently to keep the plant operating safely. The purpose of this study is to develop a method to measure vibrational stress efficiently by using multiple contactless displacement sensors. The applicability of the method is verified by vibration tests with a pipe. In the vibration tests, the stress calculated by the proposed method was compared with the stress measured by strain gauges. As the results, the calculated stress was in good agreement with the measured stress though having some errors which are negligible comparing to endurance limit of failure. Therefore the method we developed is applicable to measure vibrational stress of small-bore piping.
