On Travelling Wave Modes of Axially Moving String and Beam

Figure 2

First four-order modes of an axially moving string. Every single curve plotted by the colored levels from shallow to deep denotes the modal motion in different time. The red arrows denote the wave direction. (a)  = 0.1, (b)  = 0.5, and (c)  = 0.9.

(a)

(b)

(c)