Figure 2.22 Strouhal number St = fsD/ V plotted against the roughness Reynolds number Reg = 

 Vb/v. 



Figure 2.23 Peak cross flow displacement response Yl D (standard deviation of Y) plotted against re- 

 duced velocity Vr = Vj f„D. 



Figure 2.24 Measured peak cross flow displacement amplitude YID plotted as a function of the reduced 

 velocity V,. 



Figure 2.25 Strouhal number St^ plotted against the spanwise distance along a circular cylinder in a 

 linear shear flow. 



Figure 2.26 Long exposure photgraphs of vortex shedding from a circular cylinder in a linear shear 

 flow. 



Figure 3.1 Vortex-excited strumming vibrations of a taut marine cable. 



Figure 3.2 Vortex-excited strumming vibrations of a taut marine cable. 



Figure 3.3 Strumming drag coefficient C^ for a smooth cable plotted against Reynolds number Re. 



Figure 3.4 Strumming force (tension fluctuation)^ for a smooth cable. 



Figure 3.5 Flow visualization of vortex shedding at several spanwise (B locations along a stationary 

 and vibrating flexible cable. 



Figure 3.6 A line drawing of the DTNSRDC experimental strumming test rig. 



Figure 3.7 Typical force traces over a resonant portion of a cable towing acceleration sweep, from the 

 DTNSRDC experiments. 



Figure 3.8 Strumming displacement spectra for a fundamental cable mode, from the DTNSRDC exper- 

 iments. 



