2022

Availability Analysis of an Offshore Wind Turbine Subjected to Age-Based Preventive Maintenance by Petri Nets
By: Eduard LotovskyiORCID,Angelo P. TeixeiraORCID andC. Guedes Soares *ORCID
Paper selected by Ordem dos Engenheiros I Colegio de Engenharia Naval

• This paper analyses the production availability and the associated maintenance costs of an offshore wind turbine with a horizontal axis configuration using Petri Nets modelling with Monte Carlo Simulation.

Multi-Attribute Decision-Making Ship Structural Design
By: Tiago Pereira and Yordan Garbatov
Paper selected by Ordem dos Engenheiros I Colegio de Engenharia Naval

• This study develops a procedure for performing multi-attribute decision-making ship structural design of a multi-purpose ship. The already designed ship is further structurally designed to comply with the requirements of the Classification Societies

Shallow-draught vessels for the Vessel Train
By: Igor Bačkalov1,Milan Kalajdžić, Nikola Momčilović, Stefan Rudaković and Milica Vidić2
Paper selected by the Society of Naval Architects of Serbia

• The Vessel Train concept implies a convoy of digitally connected vessels whereby only the first vessel in the convoy (the “lead vessel”) is fully manned, while the remaining vessels sail with the crew off-duty (in a periodically unmanned regime) or with a reduced crew (in a partially unmanned regime)This paper discusses the challenges encountered in design of large inland container Ro-Ro vessels with extremely shallow draughts, intended for the use in the Vessel Train.

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2021

Experimental Testing of Scarf Joints and Laminated Timber for Wooden Boatbuilding Applications
By: J-B R G Souppez
Paper selected by the Royal Institution of Naval Architects

• This paper employs destructive testing to tackle two distinct cases. On the one hand, the strength of plain scarf joints as a function of their slope is evaluated. On the other hand, the effectiveness of a range of adhesives is ascertained for the purpose of laminated manufacturing. The results are compared to both solid wood and the mechanical properties assumed by modern scantling regulations, revealing significant differences

Reliability based structural design of river–sea tankers: Still water loading effects 
By: Milorad Motok, Nikola Momcilovic, Stefan Rudakovic
Paper selected by the Society of Naval Architects of Serbia

• This paper uses probability approach to estimate the reliability index of Rule based formulas for still water bending moment, i.e., the probability that thus obtained values will not be overcome by actual, lege artis calculated values. It is based on analyses of more than 400 load cases of 37 prominent river-sea tankers. Acquired results are also input parameters for further analyses, which would include wave induced loads and are the subject of succeeding investigations.

Mixed-Fidelity Design Optimization of Hull Form Using CFD and Potential Flow Solvers
By: G. J. Grigoropoulos, C. Bakirtzoglou, G. Papadakis, and D. Ntouras
Paper selected by the Hellenic Institute of Marine Technology

• This paper proposes a new mixed-fidelity method to optimize the shape of ships using genetic algorithms (GA) and potential flow codes to evaluate the hydrodynamics of variant hull forms, enhanced by a surrogate model based on an Artificial Neural Network (ANN) to account for viscous effects.

A developed failure mode and effect analysis for floating offshore wind turbine support structures
By: He Li, H. Diaz and C. Guedes Soares
Paper selected by Ordem dos Engenheiros I Colegio de Engenharia Naval 

• This paper extends the conventional failure mode and effect analysis methodology by introducing weights of its indices that are severity, occurrence, and detection as a basis to analyze the failures of the support structure of a generic floating offshore wind turbine. Critical failure causes, failure modes, as well as systems of the support structure of the floating offshore wind turbine are ascertained.

Spatial correlation analysis of near ship collision hotspots with local maritime traffic characteristics
By: H. Rong, A.P. Teixeira and C. Guedes Soares 
Paper selected by Ordem dos Engenheiros I Colegio de Engenharia Naval

• A spatial correlation analysis of near collision clusters with local traffic characteristics is presented. The Moran’s I and Getis-Ord Gi* spatial autocorrelation methods are used to determine whether near collisions show spatial clustering from global and local perspectives. The application of the developed approach to Automatic Identification System data of the maritime traffic off the coast of Portugal shows that there are several hotspots where the density of ship near collisions is relatively high.

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2020

A real time speed modulation system to improve operational ability of autonomous planing craft in a seaway 
By: H Allaka, A Levy, D Levy, T Triebitz and M Groper
Paper selected by the Royal Institution of Naval Architects

• This study focuses on developing a control system to enhance the seaworthiness of Autonomous high-speed Planing Crafts (APCs). APCs operating at high-speed in a seaway encounter very high vertical accelerations which pose a hazard to payload and crafts' structural integrity. Therefore, for safety operation of APCs in a seaway it is proposed to employ a system termed vision-aided speed modulation system (VSMS). 

Safety of autonomous inland vessels: An analysis of regulatory barriers in the present technical standards in Europe
By Igor Bačkalov.
Paper selected by the Society of Naval Architects of Serbia

• This paper presents an analysis of technical regulations addressing the safety of inland cargo vessels in Europe, in light of the developments leading towards the introduction of autonomous ships in inland navigation.

Damage Stability of River Cruisers: A Case for Harmonization of International Regulations
By: I Bačkalov and M Vidić.
Paper selected by the Society of Naval Architects of Serbia

• Rapid growth of the river cruising industry brings the safety of inland passenger ships into spotlight. A review of the existing safety regulations, however, exposes the fact that a common international regulatory framework for inland vessels currently does not exist. The paper presents damage stability assessment of a state-of-the-art European inland passenger vessel (the so-called river cruiser) performed according to the requirements of the regulations which are presently in force in Europe and worldwide.

The Digital Twin in the Marine & Offshore Industry: One concept, multiple adaptations  
By: Jose Esteve
Paper selected by the Association Technique Maritime et Aéronautique

• Nowadays the term “Digital Twin” is seen very frequently in presentations, teasers and brochures. But what does it really imply? The proposed paper will look at the different proposals of “Digital Twin” that can be seen currently promoted for the Marine & Offshore industry and try to clarify the differences between them, both in content and their expected purpose. As a point of reference Bureau Veritas will present their proposed meaning to “Digital Twin”, illustrated by their initiatives around Asset Integrity Management and 3D Digital Classification. The author does not attempt to be exhaustive in all the possible uses of “Digital Twin” but expect to cover a sufficient range and points of comparison to help the readers to evaluate if a “Digital Twin” fits their needs better than another “Digital Twin”

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2019

The Sophistication Of Early Stage Design For Complex Vessels 
By: Professor D Andrews. 
Paper selected by the Royal Institution of Naval Architects

• It is considered that this paper, which was a synthesis of his previously published research on ship design, was a seminal paper which sets the benchmark for ship designers looking to exploit new technology and techniques. As such, the paper was considered to be essential reading for all naval architects and marine engineers, and not just those working in concept design

Improving the nautical performance of a surface ship with the Hull Vane® appendage
By: Hugo Ferré; Philippe Goubault; Camille Yvin; Bruno Bouckaert
Paper selected by the Association Technique Maritime et Aéronautique

• The optimization of propulsive performance of ships is a primary and daily issue during design phases. For combat ships, the constant search for increasing operability through the improvement of seakeeping performance, acoustic discretion and manoeuvring ability is also a concern. For this reason, Naval Group studied the hydrodynamic impacts of the integration of the appendage Hull Vane® on a monohull. The appendage has been designed and optimized specifically for this hull, then compared by CFD computations with several geometries of more classic aft appendages such as wedges, interceptors and flaps. Significant gains on resistance and propulsive power were obtained, and exceeded largely what is obtained with more classic stern appendages. This analysis was completed by model tests, with and without the Hull Vane®