The Sea Study Centre of the University of Genoa took part in Genoa's International Boat Show with several interventions within Forum 2022.
It is possible to watch the videos of the conferences on Salone Nautico TV:
Conference "Nuova vita per la vetroresina", by the Sea Study Centre, University of Genoa
https://sntv.salonenautico.com/video/convegno-nuova-vita-per-vetroresina-62-salone-nautico/
Conference "Lavorare nella nautica: opportunità professionali e percorsi di studio specialistici", by Confindustria Nautica and the Sea Study Centre, University of Genoa
https://sntv.salonenautico.com/video/convegno-lavorare-nautica-62-salone-nautico/
Conference "Soluzioni innovative per il comfort a bordo e il rumore irradiato in mare", by the Sea Study Centre, University of Genoa
Conference "Sulle rotte dei genovesi d'oltremare: aspetti linguistici e storico-culturali, tra Mediterraneo e spazi globali", by the Sea Study Centre, University of Genoa
https://sntv.salonenautico.com/video/convegno-rotte-dei-genovesi-doltremare-62-salone-nautico/
ABSTRACTS OF INTERVENTIONS
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"Sulle rotte dei genovesi d'oltremare: aspetti linguistici e storico-culturali, tra Mediterraneo e spazi globali"
Intervention n°1: Prof. Chiara Fedriani and Prof. Irene De Felice
Intervention n°2: Prof. Paolo Calcagno
Intervention n°1:
The presentation discussed some linguistic and cultural-historical aspects that emerge from notarial texts written in Latin and related to the colonies of Chios and Cyprus, established by the Genoese who plied the eastern Mediterranean between the 13th and 15th centuries. Through these texts, we dwelled on the multicultural landscape of the Mediterranean, a highly mobile and interconnected cultural-historical area, of which the sea represents, according to Braudel, “the greatest existing document of its past life”, and which has long aroused the interest of linguists interested in the history of linguistic contact, the development of lingua franca, and multilingual repertoires. In this context, the Genoese played a fundamental role through the construction of overseas economic activities that led to the development of settlements and linguistic islands, a sort of ‘other Genoas’, as defined by Toso (2020: 31), the most prominent scholar in this field. The research project is funded by the CARIGE Foundation and promotes the valorization of local documents produced at a time of great historical expansion of Genoese maritime and commercial power.
"The port of Genoa" (Cristoforo De' Grassi, 1481)
Intervention n°2:
Since the early modern period, the operations of Ligurian merchants, divided among shipping, finance and trade exchanges, extended from the Mediterranean and the Black Sea to the oceans. After Columbus’ discovery, owing to the prominent position Ligurians occupied in the Iberian peninsula since the Late Middle Ages, they managed to monopolise the global circulation of silver. Part of the wealth generated in this way was reinvested in shipping: strong of the political support granted by the Republic’s government, ruled by a cohesive “navalist” faction, throughout the 17th century, some dynamic entrepreneurs envisaged the creation of companies to trade with the East Indies and Brazil, others reopened Genoa’s antique commercial networks with the Ottoman Empire, others took an active part in the dramatic venture of the Atlantic slave trade.
"Portrait of the Admiral of Genoa", Willem Van de Velde the Young, 1655, National Maritime Museum, Greenwich
"Project for stern of a vessel", Domenico Piola, Prints and Drawings Cabinet, Palazzo Rosso, Genoa
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"Nuova vita per la vetroresina"
The disposal of fiberglass pleasure-boat:
an integrated system for their demolition and sustainable disposal
Interventions by:
Dr. Davide Telleschi
Dr. Matteo Covini
Introduction by Prof.Arch. Mario Ivan Zignego
Fiberglass nowadays is still difficult to reuse / recycle and challenging to dispose of, which is why the nautical world is looking for a worthy replacement or an industrialized process that allows for its proper treatment at the end of life.
The “boat object” can be defined as a complex system where the fiberglass outer shell is nothing but the container of an enormous heterogeneity of materials. For this reason, the key to yacht recycling is based on the mechanical separation of base components and raw materials, together with a thermal demolition of the composite material to separate the reinforcing fibers from the matrix. The goal is to optimize the percentages of raw-secondary materials re-introduced into the market, a mission that can be reached by finding a link between those who build yachts and those who deal with their disposal, thus closing the life cycle of the fiberglass units with a view to a circular economy.
During the conference, the integration of two experimental processes was therefore proposed:
Post Shredded Separation (PSS)
automated separation by mechanical filters of the crumbs resulting from the shredding of a yacht in order to arrive at a collection of raw materials separated ready for recycling;
by Dr. Matteo Covini
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Thermal decomposition process of fiberglass:
non-oxidative thermal demolition of the composite material extracted, capable of separating the glass fibers from the resin
by Dr. Davide Telleschi
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"Soluzioni innovative per il comfort a bordo e il rumore irradiato in mare"
Intervention n°1: Prof. Enrico Rizzuto - DITEN
Intervention n°2: Prof. Corrado Schenone - DIME
Intervention n°3: Prof. Tatiana Pais - DITEN
Intervention n°4: Prof. Stefano Gaggero - DITEN
Intervention n°1: On board acoustic comfort and external noise impact for vessels
The presentation covered the basic elements of noise propagation, with specific reference to ships and nautical units. The elements of the propagation path were identified in the three cases of noise propagation in the interior of the unit and outside, both in air and in water.
Aspects and problems in the characterization of sources, of the transmission path and of the acoustic impact on receivers were examined together with the main countermeasures that can be adopted to limit noise transmission.
UNIGE activities in the field were briefly introduced
Intervention n°2: Noise emissions and airborne acoustic impact
Maritime transport for both passengers and freight is continuously increasing and, consequently, the global attention toward its sustainability is growing. Ships offer advantages in terms of environmental impact compared to other transportation systems but the increasing traffic volume is expected to increase pollutants. Noise produced in port areas has been neglected for too long. Only recently citizen complaints are emerging for some of the main ports in the Mediterranean. However, port noise prevention and management is difficult as knowledge on specific sources is very limited in the literature. Furthermore, on field measurements are difficult to be performed given the complexity of the port area, where multiple types of sound emitters mix and confuse each other. Noise maps represent a first important step in order to align ports to the requirements set by the Environmental Noise Directive to the transportation infrastructures.
Intervention n°3: Underwater radiated noise by pleasure craft
The impact of underwater radiated noise (URN) by ship traffic has gained an increasing interest among scientists, ship designers and builders. It is now recognized that the underwater noise generated by human activities and in particular shipping noise can be harmful for the marine fauna and therefore urgent actions must be taken to tackle the problem. To this aim a virtuous example is represented by the Port Authority of Vancouver (CA) that, since 2017, has introduced important incentives and tax relief for those ships that prove to be particularly virtuous in terms of noise emissions radiated into the water. Up to now, most of the attention has been paid to study and characterize the noise emissions of large commercial ships due their worldwide diffusion. To this aim several measurements protocols have been issued both by international bodies (ISO, AN-SI/ASA) both by the main classification societies. A lack of data is on the contrary present regarding pleasure crafts both as regards small boat and large yachts. Data coming from an experimental campaign for the measurement of the underwater radiated noise of one large yacht built by the SanLorenzo shipyards was presented. Noise has been measured for several operative conditions and speeds ranging from zero to maximum speed.
Intervention n°4: Underwater radiated noise: the propeller perspective
The increased awareness of environmental issues, and the recent attention on marine wildlife, pushed towards stricter regulations also on noise emissions, especially in protected areas, with the definition of specific class of merits by Classification Societies. Since propellers are one of the most relevant sources of underwater radiated noise, it is mandatory to address the propeller noise from the very earlier design phase. Design by optimization, together with unconventional geometries combined with semi-empirical but expeditious methods for radiated noise prediction, represent a valid alternative to traditional design approaches to include, in the definition of the optimal propeller geometry, key performance indicators related to radiated noise in addition to those usually considered for the maximization of the propulsive efficiency.
The presentation addressed these recent developments in marine propeller design, showing the improvements in terms of cavitation inception, efficiency and radiated noise achievable with this design paradigm. Numerical, as well as experimental proofs of these achievements were provided for a set of different propulsive configurations, including state-of-the-art predictions of radiated noise through acoustic analogies and Machine Learning based predictive approaches.
