Motion Simulation Analysis of the Cable-Body of the Deep Underwater Towed System

Abstract

As the demand of marine resources is continuously growing, more and more people are focusing on the study of underwater towed system for marine survey, in which mastering and predicting the dynamic characteristic of the system is the key problem. Based on the parameters of a certain underwater system, combined with the lumped mass method, the underwater cable-body 3D motion mathematical model has been established by OrcaFlex, in which the variation of the tension of the towed cable and the variation of the depth of the towed body have been given and the effect of the towed speed on critical radius in the process of the 360° rotary motion has been discussed. The results show a good agreement with previous research results. At the same time, we also make a research on the effects of the change of the hydrodynamic coefficients and the parameters of towed cable on variation of the tension and towed depth. These studies can provide a basis for the selection of cable in the system.

Modeling and adaptive controlling of cable‐drogue docking system for autonomous underwater vehicles

“…In order to analyze the effect of the drag coefficients on the simulation results, four groups of drag coefficients are selected as F I G U R E 10 Plots of (A) side view of the steady-state positions with c t = 0.005 and variable c n , (B) steady-state internal tension distribution along the cable c t = 0.005, 0.011, 0.017, 0.023, and c n = 1.0, 1.3, 1.6, 1.9 based on the Reynold numbers of the cable. [39][40][41][42] The side view of the steady-state positions and the steady-state internal tension distribution along the cable for different drag coefficient scenarios are given in Figures 9 and 10.…”

“…Four groups of cable mass densities are selected as 𝜇 = 0.82, 1.19, 1.58, and 1.83 kg/m. [39][40][41][42] The drag coefficients are set as c t = 0.005, c n = 1.0, and the simulation results are given as Figure 11. As 𝜇 increases from 0.82 to 1.83 kg/m, the vertical steady-state position of the system dropping from 18.87 to 26.94 m, while the maximum tension along the cable changes from 1210N to 1438N.…”