Obtenção da resposta de uma embarcação virtual sujeita a explosões submarinas

Abstract

After the World War II, a huge effort to increase the UNDEX (Underwater Explosions) shock resistance of naval ships was performed. These phenomena induce high displacements, velocities and accelerations in the ship's structure and onboard equipment. It is of extreme importance for the designers to reduce the possibility of structural and main onboard equipment failure due to UNDEX. The main goal of this work is to obtain the dynamic response of a generic ship subjected to UNDEX in a virtual environment. Using the explicit dynamic method available in the Ansys® platform it was possible to determine the displacements, velocities and accelerations imposed by the explosive effect at the points of interest in a virtual structure of a catamaran. Simplifications was necessary, to optimize the hardware employed in the proposed problem. Discrete-event simulations using three distinct explosive loads (88 kg, 600 kg and 1,850 kg), showed an increasing response in the selected points with the increasing of the explosive charge employed. Additionally, it was observed that the response in terms of accelerations and maximum stress are higher at bellow main deck because of the highest shock and pressure wave impact that occur at the hull area in contact with the water. It was concluded that, using the explicit dynamic method, the severe damage imposed to the structure of a ship due to UNDEX can be determined. It was also noticed that, employing the advanced CAE (Computed Aided Engineering) tools, it is possible to obtain the response of the ship’s structure caused by UNDEX in different scenarios, relatively quickly, and with an acceptable financial cost.