structural marine cable arrays. This code includes a resonant vibration analysis routine which calculates 

 the static deflections of the array due to the added drag forces that accompany strumming oscillations. 

 SEADYN is a nonlinear finite element cable system model being developed by CEL. A wide variety of 

 systems can be modeled, including: pay-out and reel-in, time varying current fields, and point loads. 

 The Skop-Griffin strumming model has been incorporated into SEADYN. SLAK is a finite-element 

 computer code that was originally developed for the analysis of the free vibrations of slack cables in 

 three dimensions. This code has been adapted at NRL for ocean engineering calculations of cable 

 equilibrium shapes, support reaction forces, natural frequencies and the mode shapes with respect to 

 the equilibrium position. 



Several appendices are included to provide additional details on topics discussed in the body of the 

 report. These topics include the dynamics of taut and slack marine cables, and the measurement of 

 cable added mass and hydrodynamic damping coefficients. Another appendix provides the mathemati- 

 cal background for the "wake-oscillator" approach to modelling vortex-excited oscillations. Other types 

 of modelling approaches (i.e., empirical, discrete-vortex, etc.) are also discussed in order to provide a 

 complete background to the cable designer. 



