抄録
In a petrochemical plant, piping vibrates and often results in the fatigue fracture of connection of tubes. A lot of hydrocarbon gas is formed in the oil refining process in such a plant, which is burned off in the air. The gas is released by pressure valve with a loud noise made, going to a flare stack. The noise has broadband and vibrates pipes, in which the flammable gas flows. This phenomenon is called "Acoustic Induced Vibration", by which a connection of tubes is thought to be destroyed. So far, measures have been given based on a certain standard originated from this thought and the mechanism of destruction does not completely clear. In this research, in order to solve this destruction mechanism, the loud noise was experimentally radiated in a pipe and a mode of vibration of pipe wall was examined. As a result, the vibration was shown to become large at specific frequency.
