Search results for "NURBS"
showing 10 items of 11 documents
CAD/CAM Integration for NURBS Path Interpolation on PC Based Real-Time Numerical Control
2008
As anybody knows, there is a fundamental difference between the newest CAD system and the conventional Numerical Control. As a matter of fact, almost every CAD Software allows programmers to use parametric 2D or 3D curves, whereas standard Numerical Control cannot perform anything more than linear or circular interpolations. NURBS are the most successful among all the proposed parametric curves, since they allow us to give an exact uniform expression to both the analytical and the free form curves. Nevertheless, this typical characteristic nowadays entails that in CAM systems a tool path is rounded down using a small movements and imposing a maximum acceptable gap. This approach leads up to…
High-fidelity analysis of multilayered shells with cut-outs via the discontinuous Galerkin method
2021
Abstract A novel numerical method for the analysis of multilayered shells with cut-outs is presented. In the proposed approach, the shell geometry is represented via either analytical functions or NURBS parametrizations , while generally-shaped cut-outs are defined implicitly within the shell modelling domain via a level set function . The multilayered shell problem is addressed via the Equivalent-Single-Layer approach whereby high-order polynomial functions are employed to approximate the covariant components of the displacement field throughout the shell thickness. The shell governing equations are then derived from the Principle of Virtual Displacements of three-dimensional elasticity an…
Integrated prototyping and rendering system for the display of ceramic finds
2017
The project, carried out in collaboration between the Department of Architecture of Palermo and the Archaeological Museum Antonino Salinas of Palermo, proposes a system of integration and reconstruction of ceramic artefacts, using modeling, 3D printing and rendering processes for an integrated museum exhibition system, which the viewers can observe the fragment nearing the re-reconstructed fragment that reconstructs the original morphology and an interactive digital model in which the viewers can also observe the metric aspect and, where present, the decorative apparatus.
Mathematical surfaces models between art and reality
2012
In this paper, I want to document the history of the mathematical surfaces models used for the didactics of pure and applied “High Mathematics” and as art pieces. These models were built between the second half of nineteenth century and the 1930s. I want here also to underline several important links that put in correspondence conception and construction of models with scholars, cultural institutes, specific views of research and didactical studies in mathematical sciences and with the world of the figurative arts furthermore. At the same time the singular beauty of form and colour which the models possessed, aroused the admiration of those entirely ignorant of their mathematical attractions
An Efficient NURBS Path Generator for a Open Source CNC
2014
In this paper a NURBS path generator (on the plane XY) is proposed to be developed for those CNC machine tools and robot which are Open Source or Opening Architecture. The goal is to use simple and efficient techniques to manufacture geometries which are very complex, whose main feature is the presence of free-form surfaces and contours. To reach this goal, the NURBS path generator has been optimized in order to enable the user to select among three different options to generate the tool path, using a specific parameter. The three options are respectively called “NURBS interpolation with constant increments of u parameter” (NICU), “NURBS interpolation with constant displacement increments b…
Représentation des NURBS par Systèmes Itérés de Fonctions
2018
International audience; Les Systèmes Itérés de Fonctions (IFS) sont un outil standard pour la génération de formes fractales. Les IFS controlés (CIFS) en sont une extension pour la création de formes fractales à dessein industriel. Un des avantages de cette approche est la possibilité de représenter des surfaces standards comme les surfaces de Bézier, Splines, et de subdivision. La représentation des surfaces par un unique formalisme facilite leur manipulation et la gestion des interactions comme par exemple la construction de raccords entre deux surfaces de natures différentes. Dans cet article, la formulation des B-Splines Rationnelles Non-Uniformes (NURBS) dans le formalisme des CIFS est…
Metodi integrati di rilievo per il monitoraggio di eventi franosi
2018
Il contributo riguarda il rilievo di un’area di circa 20 ettari interessata da una imponente frana e ubicata nei pressi del centro abitato di Caronia in Sicilia. La frana ha provocato il crollo e lo spostamento di diverse unità abitative, nonché la quasi totale distruzione delle vie carrabili. Il rilievo è stato condotto con metodi GPS, topografici e laser scanner al fine di verificare la morfologia dell’area successiva all’evento franoso. Il rilievo è stato commissionato dalla Protezione Civile Regionale di Messina ed è stato finalizzato alla programmazione degli interventi di consolidamento del terreno in particolare nelle aree prossime all’edificato. Dalla nuvola di punti generata dalle …
Architettura/Geometria/Cad. Rappresentazione di superfici elicoidali
2009
Si descrivono il percorso di indagine intrapreso e i contributi offerti dall’uso della modellazione con software CAD che, attraverso operazioni di rilievo topografico, di restituzione e di elaborazione dei dati acquisiti, hanno permesso di approfondire il processo costruttivo e di generare del modello della scala a rampe elicoidali del Palazzo dell’ex Ministero di Stato, particolarmente significativa da un punto di vista geometrico-formale e costruttivo, realizzata nel 1852 dall’architetto Carlo Giachery durante interventi di ampliamento.
Architetture del divenire. Innovazioni contemporanee/Emerging Architecture. Contemporary Innovations (presentazione di Giuseppe Pellitteri) - Quadern…
2014
La posizione assunta dall'architettura all'inizio del ventunesimo secolo è ambigua e così la forma degli edifici che ambiscono a convogliare significati. Il processo di radicale trasformazione dell’architettura, avvenuto sin dal primo Novecento, quale conseguenza della graduale sostituzione delle tecniche edilizie tradizionali con le tecniche “moderne”, ha subito un notevole slancio nell'ultimo ventennio, per effetto del crescente mutamento tecnologico. I materiali, le tecniche costruttive e l’innovazione tecnologica hanno condizionato sensibilmente ed irreversibilmente il pensiero architettonico, producendo in questi ultimi anni nuove espressività linguistiche del tutto “insolite” rispetto…
A GAMING APPROACH FOR CULTURAL HERITAGE KNOWLEDGE AND DISSEMINATION
2019
Abstract. In these last years, video games have become one of the most popular entertainment for children/teenagers/adults thanks to their appealing and seductive features and, in this context, the Serious Games (SG) have become an important research field. The most popular SGs in Cultural Heritage (CH) used the historical building like scenario where the game is playing. In this paper we show the procedure to achieve a CH video game where the Cultural Heritage is the main actor and not the scenario of the game. Furthermore, the game is not a SG but an Action-Adventure Game (AAG) or Survival Game (SuG), in a largest heading it can be classified as Entertainment Games (EGs). The novelty of t…