Increased use of Autonomous Underwater Vehicles (AUVs) caused an increase in their design sensitivity. The subject of most of AUV design studies was on drag reduction, ease of handling and their stability. Adequate design and prediction of the behavior of these vehicles requires an accurate estimation of corresponding hydrodynamic derivative loads. In this study, Hydrodynamic derivatives of the...

In this paper the effect of tail form on maneuverability of autonomous underwater vehicle is investigated. In the beginning, tail form is defined using a mathematical function dependent on two parameters including length of the tail and its cone angle. Then the effect of these two parameters on the hydrodynamic coefficients and maneuverability is investigated respectively. Hydrodynamic damping ...

Propeller is one of the main propulsors for marine vehicles which produces thrust to overcome the resistance of the ship. Propeller works in the place behind the ship where the flow is non-uniform and with three dimensional velocities, so it causes the fluctuating thrust. The first part of this paper employs the boundary element method (BEM) to evaluate and analyze the hydrodynamic performance ...

Seakeeping recording of a vessel, so called seakeeping trial, is an important issue which is performed for some vessels. The goal of this research is to develop principles of seakeeping trial of planing vessel in sea waves. For this purpose it is initiated with the principles of ship seakeeping in sea trial. The main feature of a planing vessel is dynamic trim, high slamming accelerations and i...

In this paper by analyzing the penetration mechanics of the segmented rods into semi-infinite ceramic targets, a mathematical model is provided to predict segmented rod projectiles penetration into semi-infinite ceramic targets. In analysis three factors of segments length, segments distance and number of segments are considered. Results suggest that the most important factor in penetration dep...