521 Lateral Vibration of a Fluid-Conveying Pipe with Two Coupled Modes

Abstract

Lateral vibrations of a cantilevered pipe, which is hung vertically with an end mass and conveys fluid, are experimentally and theoretically examined when the flow velocity is constant. We are interested in such a case that two-frequencies oscillation of the pipe involving the two unstable modes at higher flow velocity. This phenomenon will be called mixed/coupled mode flutter.