RIZZO C. M.

For naval ships, shock phenomena caused by underwater explosions are demanding limit states not only for machinery and equipment, but also for their foundation structures. Being a crucial part of the system integration, their shock resistance is normally verified by means of dedicated calculations as it is in general not possible the testing of...

Experimental and computational methods: two faces of the same coin (plenary lecture at opening session of the conference). COmputational methods need to be validated, testing and trials need to be designed. An outline of practical cases is provided in the lecture.

Merchant vessels experience regular structural assessments. Traditionally, surveys are performed physically by surveyors being expansive and time-consuming. Imagery based, cracks recognition is a topic obtaining considerable interest in commercial and scientific sectors. By using computer vision algorithms, authors propose a new approach to...

Weight saving is crucial in naval architecture to reduce costs and improve performances. In sailing ships design, rig's scantling is important also for ship stability, as rig's weight generates heeling actions on the vessel, due to heeled navigation. Therefore, rig's weight saving remarkably reduces ship's heeling, allowing to increase the wind...

Hull weight is a design parameter affecting the whole performances of a ship, being related to building costs, operational costs, maintenance and durability, and not least to satisfaction of functional requirements. Naval ships are no exception and impact of hull weight is crucial to fulfil mission requirements. In the light of the above,...

In this paper, a semi-automatic design procedure for concept and preliminary phases of hull structural design is described. It allows investigating the design of ship structures, consisting of a series of stiffened panels surrounded by primary members, assembled to form the hull girder. The optimal configuration of the structural layout and the...

Nonostante negli ultimi anni le normative applicabili per la progettazione strutturale della carpenteria metallica siano state profondamente rinnovate, permane tuttavia un forte radicamento a concetti derivati da un'esperienza secolare che limita molto spesso le potenzialità offerte dalle innovazioni tecnologiche dei materiali ad alte...

Correct management of fuel supply involves commercial, technical and safety implications. This paper deals with malfunctions of two strokes slow speed Diesel engines and related wearing effects on cylinder liners caused by inappropriate fuel quality. Combustion process of fuels has been examined, highlighting parameters giving malfunctioning...

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To further exploit the potential of marine composites applications in building ship hulls, offshore structures, and marine equipment and components, design approaches should be improved, facing the challenge of a more comprehensive and explicit assessment of appropriately defined limit states. The structure ultimate/limit conditions shall be...

Despite several potential advantages, relatively few studies and design support tools have been developed for floating VAWTs. Due to the substantial aerodynamics differences, the analyses of VAWT on floating structures cannot be easily extended from what have been already done for HAWTs. Therefore, the main aim of the present work is to compare...

In various fields of industrial engineering, including naval architecture, structural design is considered one of the most challenging steps by designers as it shall accommodate all other design aspects, likely already defined in earlier steps. Moreover, structures need to comply with specific requirements, i.e. limit states, while also...

Composite materials are becoming more and more popular, even for large ship and offshore structures. They offer lightweight and adaptable strength and stiffness properties. In case of slender structures, where buckling is the governing limit state, such features are valuable and allow designing high performance assemblies like racing crafts as...

The ROBINS project aims at filling the technology and regulatory gaps that today still represent a barrier to the adoption of Robotics and Autonomous Systems (RAS) in activities related to inspection of ships, starting from understanding end user's actual needs and expectations and analyzing how existing or near-future technology can meet...

Ships condition is assessed regularly to maintain safety. Traditionally, structural integrity assessment is performed by surveyors, requiring complex and time-consuming operations to accessany ship space. Imagery based, three-dimensional (3D) reconstruction of structures is a new area obtaining considerable interest. It can provide low-cost,...

This paper deals with the buckling assessment of stiffened panels, typical of ship and offshore structures. In particular, rather slender structures, involving very thin plates and stiffeners with limited cross section, are considered. In order to limit the computational burden of a fully nonlinear progressive collapse analysis but, at the same...

Dock tuning is a crucial stage in the rig service life and in the sailing management. Such operation is necessary for safety and structural stability reasons. The applied pretension has the purpose to increase the stiffness of the whole rig, reducing large displacements caused by aerodynamic and inertial loads. Furthermore, since the rig is...

Currently, there exists a relatively large number of guidelines and recommendations which deal with the fatigue assessment of welded structures. In these guidelines, different approaches are proposed to assess the service life of welded structures under multi-axial loading conditions. Aim of this paper is the evaluation of the quality of these...

The anti-ballistic properties of a new advanced composite armor system have been investigated with the aim to minimize the armor system total weight per unit area. The innovative protection, made of a silicon carbide ceramic outer layer and an inner composite back-packing layer formed by ultra-high molecular weight polyethylene (UHMWPE) fibers,...

Even if the non-contact underwater explosion phenomenon has been studied for decades and various numerical methods have been provided in open literature, its effects on naval structures, especially those made by composite materials, are, even nowadays, a matter of research. Actually, a fully coupled fluid-structure interaction model for...

Despite the underwater explosion phenomena (UNDEX) have been studied for decades and several numerical methods have been proposed in literature, the simulation of the whole phenomenon in issue is even nowadays a matter of research. In this paper, a Volume of Fluid (VOF) approach, which allows the simulation of Fluid-Structure Interaction (FSI),...