配管振動の有限要素法による解析

抄録

In large-scale plants including oil refining plants, occurrence of accidents that cause crucial damage to piping systems has been reported so far. As one of the reasons for this phenomenon, acoustically induced vibration (AIV) is pointed out. AIV is vibration caused by a broad-band sound generated from a differential pressure regulating valve in the piping system. The pipe is excited by the sound and the pipe and the gas in pipe vibrate sympathetically, which leads tofatigue failure of the pipe. This study focuses on AIV phenomena and aims at clarifying the mechanism of AIV. A relation between wave numbers and vibration modes of air column in the pipe is analyzed as well as that of the pipe itself by a modal analysis using the finite element method. Additionally, a resonance phenomenon is discussed between the pipe and the air column.