Abstract
This report presents the longitudinal dynamics of underwater towed body system.Firstly, the longitudinal equations of motion of underwater towed body system were derived by treating the cable as lumped parameter system of discrete masses.Secondary, hydrodynamic characteristics of the hypothetical towed body, which is necessary for the analysis, were obtained experimentally. Utilizing above results, the longitudinal equations of motion of underwater towed body system under external disturbances were solved numerically.As the result, dynamic characteristics of underwater towed body system, mainly towed body response to the heaving towing point, were made clear.
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