“…From the existing literature, one "nds that most of the researchers studied the stability problem of the piping systems [1}7, 9}12], whereas fewer researchers have studied the forced vibration of a #uid-conveying pipe [3,8,9,12]. Most dynamic analyses of a &&single-span'' piping system are performed using the assumed mode (or modal analysis) method [1}4, 7] or FEM [5,6], but those of a &&periodically supported'' #uid-conveying piping system are solved with the wave approach [10}12]. This is because the dynamic equation of motion for any span of the latter system is the same and the amount of computation for the wave approach is independent of the number of spans.…”