1,721,035 research outputs found
Beyond The Wall, Notes An Multicultural Mediterranean Landscape
No full textIl libro contiene degli articoli sulla multiculturalità nelle città del Mediterraneo. Il Mare Nostrum dei romani è stato il più straordinario teatro d’incontri delle civiltà. Il libro di Fernand Brodel “La Mediterranée e le monde mediterranéen a l’epoque de Philippe II” è uno straordinario affresco che, puntando alla totalità del lago chiuso, rappresenta l’unità organica di un mondo idilliaco di relazioni tranquille.
Il quadro è più realistico sembrerebbe quello di una convivenza in uno stato di latente conflitto, che esplode ancora nel XXI secolo – come il conflitto dei Balcani che ha portato alla disintegrazione della Jugoslavia.
Gli articoli (13) descrivono numerosi casi di studio messi a confronto; la città di Essaouira in Marocco, la città di Aleppo confrontata con le città tunisine, la città di Tartous in Siria, le case ottomane, la Petite Sicile a Tunisi, le periferie di Tunisi, i progetti per la multiculturalità a Palermo ecc.
La descrizione dei casi di studio presenta un quadro complesso di una realtà che è tuttora in fermento, ed è proprio la velocità della sua modificazione che non consente facilmente la sua descrizione
Correction to: Assessment of close-range photogrammetry for the low cost development of 3D models of car bodywork components (International Journal on Interactive Design and Manufacturing (IJIDeM), (2022), 16, 2, (703-713), 10.1007/s12008-022-00865-6)
No full textAuthorswould like to correct Figure 1 and Image credits with the updated version. The corrected version of Figure 1 and Image credits updated here. The original article has been corrected
Model-Based Approach for Optimal Allocation of GD&T
No full textModel-based Definition (MBD) is a known design approach that aims to an effective integration of Product Manufacturing Information (PMI) within geometrical data. By means of MBD, product requirements and specifications based on Geometric Dimensioning and Tolerancing (GD&T) can be directly associated to 3D models, improving interoperability between design and simulation virtual environments. However, especially in industrial settings, many challenges still limit MBD diffusion, such as limited knowledge and application of GD&T rules, inconsistent representation of PMI, lack of methodological and organizational approach based on PMI. As a consequence, the Dimensional Management practice based on GD&T cannot be systematically applied, and the full potential of Computer-Aided specific tools remains unexpressed. In this paper, the effective implementation of MBD for PMI during both product and process design is proved through its direct application on tolerance-cost optimization. Thanks to 3D semantic annotations, a model-based framework is suggested to validate functional requirements of a mechanical assembly and to assess production efforts, enhancing the integration between tolerance analysis and manufacturing cost tools. The interrelation of GD&T schemes enables the automated transfer of the data linked to annotations toward Computer-Aided Tolerancing (CAT) and Product Cost Management (PCM) virtual environments. Consequently, PMI guides the simulations during the multi-disciplinary optimization, proving its effectiveness in communicating engineering information and enabling the transition to digital manufacturing though MBD
TOLERANCE SPECIFICATION MODEL FOR SYSTEMATIC APPLICATION OF GD&T IN PRODUCT DESIGN
No full textThe Dimensional Management (DM) is well known as the reference methodology for the management of dimensional and geometric variations of industrial products. Over the years, it has assumed a central role, thanks to the development of a specific design approach, known as Design for Tolerancing (DFT). Based on the Geometric Dimensioning and Tolerancing (GD&T) symbolic language, DFT allows to check and verify functional and qualitative requirements from the early design phases. Although its strength and potential to improve design optimization, DFT industrial application is still limited. Consolidated design practices, complexity of tolerance specification process, lack of support from Computer-Aided tools still limit the tolerance specification to final validation of product design. The paper aims to define a tolerance specification model for systematic application of GD&T specification. The model formalizes the identification and translation of product requirements on the components geometry, through the definition of the main step of tolerance design. Based on the integration between the GD&T-based approach and parametric threedimensional CAD modelling, the model has been applied to validate the GD&T and the tolerance specification of two mechanical assemblies with common features. The methodology proves its general effectiveness to support engineers in tolerance design and selection of the most suitable GD&T schemes
Assessment of close-range photogrammetry for the low cost development of 3D models of car bodywork components
Full text linkClose-range photogrammetry (C-RP) is a widespread and efficient technology to obtain digital models of physical objects. Typical limitations as sharped geometry, shiny surface finishing and light conditions can be overcome by using high-end equipment, which results in increased costs and requires specific skills in human operators. This paper aims to investigate whether a low-cost and simplified approach to C-RP makes it suitable for the 3D acquisition of bodywork components and similar free-form artefacts, as an affordable alternative to 3D scanning in fields where a lower value of accuracy is required. Hence, two commercial C-RP software were used to 3D capture handcrafted car body panels and compare the C-RP models using a 3D scan as a reference within an inspection software. Two case studies are considered: a 1:5 scale model of the front bonnet of a Ferrari 250 Testa Rossa from 1958 and a head lamp housing of a Ferrari 275 GTB from 1962. Considering the complexity of double curvature surfaces and the reflection due to material and surface treatment, both these artefacts require some pre-processing operations and an adequate set-up to perform image acquisition. These case studies represent a relevant application for the field of classic vehicle restoration, where C-RP could be a promising technique to support panel beaters and craftsmen during rebuilt operations of masks and bodywork spare parts of high-end historic cars
Territorial Policies, Social Exclusion and Immigration in the South
No full textNell'articolo in oggetto viene condotta un'analisi comparativa e valutativa dei Programmi di Iniziativa Comunitaria degli anni '90 in Italia - in particolare dei 16 casi (in città grandi e medie) del primo programma Urban - relativamente ai presupposti ideologici in essi contenuti e agli 'effetti perversi' prodotti da questi nelle azioni di inclusione sociale degli immigrat
Synergic Product and Process Design for Additive Fabrication of Lightweight Vehicles
No full textAdditive manufacturing is even more capturing the interest of vehicle manufactures. Its adoption enables design potentials such as parts customization, lightweighting or functional integration. Deep adoption of additive manufacturing and integration of topology optimization design techniques enable the calculation of light components, while additive manufacturing makes it feasible by adding subsequent layers of material. Design for additive manufacturing guidelines address these challenges by enabling the build of such complex shapes thanks to parts consolidation and features integration. Several prototypes of such lightweight design concerning chassis, body, and structures have been provided, but the lack of structured and objective approaches limits the application in normal production. This work integrates Key Performance Indexes (KPIs) into the Design for Additive Manufacturing (DfAM) approach for an effective adoption of selection of trade-off studies for the selection of best product variant and process setup. The trade-off involves KPIs related to structural product requirements and laser Powder Bed Fusion process cost estimation, to return functional components that address the best ratio between weight reduction and expected manufacturing cost. Proof of the method effectiveness and its application to lighten real components is demonstrated by applying the approach to reduce the weight of a steering support system for a Formula SAE race car. The objectivity of the trade-off promotes the extensive adoption to other vehicle components for substantial fuel efficiency improvement and emissions reduction perspectives
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