レーザー変位計を用いた小口径配管の振動応力計測方法の開発(保全・設備診断技術,<特集>第13回動力・エネルギー技術シンポジウム)

Abstract

In the nuclear power plant, many small-bore piping are near vibrational sources like pumps, and it is important to evaluate vibrational stress of the piping efficiently to prevent the fatigue failure. We developed a new method to evaluate vibrational stress using displacements measured by multiple contactless displacement sensors. The purpose of this study is to verify the applicability of the proposed method by vibration tests with a pipe. In these tests, the stress evaluated by this method was compared with the stress measured by strain gauges. As the results, the evaluated stress was in good agreement with the measured stress, but this method has 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.