Abstract
A method is presented for the numerical simulation of the three-dimensional geometric behavior of cable-towed acoustic array systems (as well as other series-connected marine structures). The simulation is verified by comparison with laboratory and ocean experiments. The lumped element method is used to generate ordinary differential equations for the motion of nodes on the system. Numerical integration of the equations is performed by standardized, error-controlled software for stiff systems. Input consists of the system structural definition (component parts) and a scenario (deployment method; environment). Output includes integration statistics and plots/tables of state variables and element tensions angles. Features include modular part deginitions; unrestricted constrained motions; cable winching and parallel stress elements (VIMs). Input specification of non-linear tensions, non-uniform drag and general currents and force fields are by analytic functions or data tables for maximum flexibility. The properties of individual nodes may be altered to account for special cases of gravitational or inertial mass, buoyancy and spherical drag. The report includes comparisons with other published methods.
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