1,721,012 research outputs found
Erratum to Application of the 'structural stress' approach to a welded joint with complex geometry (Welding International, (2009), 12, (904-915))
No full textPractical implementation of robotic technologies for the inspection of ships
No full textThe 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 them.
-Robotics technology:
Improve the ability of RAS in sensing and probing;
Improve capabilities in navigation and localization in confined spaces, access to and mobility within the environment;
Improve safety and dependability of RAS in hazardous, harsh and dirty environments;
Provide new tools for image and data processing (3D models, VR/AR environments);
Provide the same level of information as obtained by direct human observation for the assessment of inspected structures.
-Rules and Regulations:
Provide a framework for the assessment of equivalence between the outcomes of RAS-assisted inspections and traditional inspection procedures;
Define criteria, testing procedures and metrics for the evaluation of RAS performance;
Design, implement and assess a testing environment where repeatable tests and measurements of RAS performance can be carried out;
Improve confidence in technology capabilities by means of test campaigns to be performed both in the testing facilities and onboard.
The expected impact can be summarized as follows:
Wide scale adoption of RAS technology in marine industry
Improved safety in ship surveys
Economic advantages
new supply chain and new potential markets particularly beneficial for SMEs;
new services and products for data processing and knowledge management;
reduction of costs related to inspection activities;
improvement in the quality and variety of inspection services;
new certification schemes for equipment, operators and procedures
Experimental and computational methods: two faces of the same coin (plenary lecture at opening session of the conference)
No full textExperimental 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
Uncertainties estimates of hull girder still water loads of bulk and dry cargo ships through Monte Carlo simulations
No full textFSI simulations for sailing yacht high performance appendages
No full textIn an age where sailing boats are losing their reputation of slow-moving vehicles, and where technologies are developing at explosive rhythm, the scantling criteria are deeply changing and naval architects face new challenges. Beside a literature review on sailing yacht appendages design, the state of the art of the methods for fluid-elastic phenomena prediction is presented. To face the problem of numerical modelling, an overview on Fluid-Structure Interaction (FSI) numerical computational is provided, introducing the main parameters to care about while modelling the interaction of a hydro-foil with the flow. The software capabilities are explored, reporting the main steps to follow, in order to build both solid and fluid models of a hydrofoil, and to couple them in a FSI analysis. A suitable test case has been selected, providing numerical and experimental reference for outcomes comparisons. The results are presented focusing on tolerances, relaxation factors and time discretisation effect on the solution
Performance characterization of joints in S355 grade steel and quenched and tempered steels for structural applications
No full textAlthough in recent years the applicable regulations for the structural design of metal carpentry have been profoundly renewed, there is still a strong rootedness in concepts derived from centuries-old experience that very often limits the potential offered by the technological innovations of high-performance materials, as in the case of tempered steels. After verifying in the scientific literature, in the commercial literature of manufacturers and in the material databases, the availability of the main data necessary for the characterization of tempered steels usable in large metal carpentry, a wide experimental campaign was undertaken aimed at obtaining a characterization updated and specific mechanics for some types of materials, which allows the overcoming of the stringent requirements of current regulations on the use of these materials both for the base material and for the welded joints, homogeneous and heterogeneous. This work presents the main results obtained
Ship Recycling: il riuso della componentistica navale nel settore civile
No full textIn questo articolo si propone un possibile riutilizzo dell'acciaio degli scafi delle navi poste in disarmo per altre attviità delle forze armate. L'articolo, sviluppato sulla base di uno studio svolto nell'ambito di una tesi di laurea in ingegneria navale presso l'Accademia Navale di Livorno, presenta non solo argomenti tecnici ma anche gestionali economici e di fattibilità
A fatigue assessment procedure for drilling pipes of scientific vessels
No full textIn recent years, many disasters due to earthquakes and
tsunamis occurred in various countries, including Japan. Two
triple junctions exist below the Japanese archipelago and around
Japan, where three plates meet to form a complicated crustal
structure. To conduct research on the Tohoku earthquake, which
accompanied the tsunami that devastated northern Japan in
March 2011, Japan Agency for Marine-Earth Science and
Technology (JAMSTEC) constructed the scientific deep-sea
drilling vessel Chikyu. To understand the mechanism of the
earthquakes, a direct access to the fault zone is necessary.
During drilling operations, the drill pipes are stressed by
different forces and the occurrence of drill-string failures is high,
which causes significant loss of money and time. This study
focused on the definition of a practical fatigue assessment
procedure useful to avoid failures during drilling operations. In
this paper the proposed procedure is outlined, and the sensitivity
analysis carried out to highlight most influencing parameters is
presented
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