Frequency-domain dynamic analysis of cables

Artikel i vetenskaplig tidskrift, 1997

A linear, frequency-domain, dynamic method is introduced to calculate large motions of slender structures such as towing and mooring cables, and flexible risers. The viscous, drag damping is linearized at element level by calculating linearized equivalent damping coefficients through iteration, In the introduced method the work done by the motion of the cable in the time domain is equated with that done in the frequency domain, The linearized, frequency-domain results are compared with results from nonlinear simulations for a towing cable, a mooring line and a lazy-wave riser. The influences of excitation frequency and excitation amplitude are considered.