Search results for "shape"
showing 10 items of 585 documents
Il mattone cuneiforme maiolicato. Procedure algoritmico-parametriche digitali come strumento di indagine e progettazione: dall'architettura storica a…
2020
The study focuses on the cuneiform in majolica brick that has been widespread in Sicily since the 16th century for the construction of spires and domes. A unifying element that has constituted a particular identity contribution to the island’s brick tradition; an original solution able to combine aesthetics with structural and durability. On the basis of more than a hundred examined cases, the different geometrical-formal peculiarities detected in relation to the characteristics of the shell are described. Some analyses and checks of the traditional geometrical composition patterns of the wall facade are reported. Through the definition of digital tools of algorithmic-parametric design, new…
Filigree constructions vs solid constructions. The relationship between structure and architecture in the contemporary age
2010
Historically, building shape and structure have been designed, in solid construction, at the same moment. Their relationship is evident in the organization of the building inner space. On the contrary, in filigree construction, the interior space isn't often directly defined by the structure and the separation between building's interior and exterior is much more clear especially if we consider contemporary architectures where filigree structures are frequently used. The paper points out the role of structure in relation to the building shape in the contemporary age. Different architectures have been analysed (such as high-rise and free-form buildings) in order to put in evidence the criter…
La ricostruzione dell'abside in alcuni esempi della seconda metà del XVI secolo a Palermo
2015
Il contributo ha l’obiettivo di studiare alcuni casi di ricostruzione dell’abside eseguiti in edifici chiesastici palermitani nella seconda metà del XVI secolo. Si tratta delle chiese di San Sebastiano, San Francesco d’Assisi e San Martino delle Scale (all’interno dell’omonima abbazia), in cui, nella seconda metà del Cinquecento, per motivi liturgici, l’abside originaria viene “trasformata”, in un’abside “piatta”, al fine di potervi inserire il Coro ligneo. Il nuovo posizionamento del Coro, in conseguenza della Riforma tridentina - problematica centrale nell’Europa di età moderna – suscita, anche in questi casi palermitani, dibattiti e controversie. Il cambiamento della forma dell’abside de…
Numerical assessment of heating energy demand for office buildings in Italy
2016
Buildings energy consumption depends on several parameters, such as climate, envelope typologies, occupant behavior, intended use, etc.; assessment of the energy performance of a building requires substantial input data describing constructions, environmental contexts, thermo-physical properties, geometry, control strategies and several other parameters influencing the thermal balance. In the last years, several numerical approaches dedicated to building simulation have been tested developing specialized software. On the other hand, simplified building models permit the evaluation of indoor conditions and heating/cooling loads with a good level of accuracy and without excessive computationa…
A Hybrid Frequency-Space Approach for Shape Measurement by Shadow Moirè Technique with Carrier Fringe Pattern
2006
In this paper, a novel methodology to process fringe pattern is presented. The core of the signal processing technique is the use of the direction information, a modulo 2π quantity that locally informs about the direction along which fringes grow with maximum rate. By using this information, it was possible to perform adaptive, direction - and orientation-based operations on fringe images in order to remove unwanted effects, to enhance the contrast and to extract the phase information encoded. The method has been applied on shadow moiré interferograms with carrier fringes in order to measure the surface of small objects. The developed algorithm allows to process fringes whose phase informat…
Standard mechanical testing is inadequate for the mechanical characterisation of shape-memory alloys: Source of errors and a new corrective approach
2022
Thanks to its unique behaviour characterised by a superelastic response, Nitinol has now become the material of preference in a number of critical applications, especially in the area of medical implants. However, the reversible phase transformation producing its exceptional comportment is also responsible for a number of phenomena that make its mechanical characterisation particularly complex, by hindering the assumptions at the very basis of common uniaxial tensile testing. This necessarily reduces the level of safety and design optimization of current applications, which rely on incorrect mechanical parameters. In this study, the spurious effects introduced by the unconventional material…
Wind tunnel testing, numerical analyses and shape optimization of a vertical axis wind turbine
2011
In this work the aerodynamic efficiency of a small commercial vertical axis wind turbine is investigated experimentally and numerically. The turbine is a Darrieus type with three vertical airfoil blades having helical twist of 78 degrees, height 1.45m and diameter of 1.45m. The airfoils have a chord of 222 mm and a thickness of 35 mm. The experimental studies were made in a wind tunnel where a hot-wire anemometer was used to measure the wind speed. The power curves of the turbine were extracted using a generator connected with an inverter able to vary the resistant moment applied to the turbine and to measure its resulting angular speed. The energy produced by the turbine itself at various …
RILIEVO FOTOGRAMMETRICO E ANALISI CFD DI COPPIE GENOA RANDA E CONFRONTO TRA FLYING SHAPE E DESIGN SHAPE
2011
Le vele di una imbarcazione sono sottoposte a grandi spostamenti a causa della loro natura altamente flessibile, per tale motivo, la forma che assumono quando sono sottoposte alla forza del vento è differente da quella di progetto stabilita dal velaio. Nel lavoro gli autori propongono un metodo basato sull’utilizzo della tecnica fotogrammetrica per il rilievo in navigazione di vele in vera grandezza. L’utilizzo di tecniche ottiche di Reverse Engineering consente, infatti, la ricostruzione tridimensionale del modello dell’intera vela. Vengono costruiti i modelli CAD delle vele di un’imbarcazione di classe Meteor in condizioni di navigazione (flying shape) e in condizioni di progetto (design …
Numerical solution of electric field integral equation for thin-wire piecewise antennas shape reconstruction
2012
Fast Volumetric Reconstruction of Human Body through Superquadrics
2013
This paper describes a technique to reconstruct the volumes of the human body. For this purpose, are introduced mathematical objects able to represent 3d shapes, called super quadrics. These objects are positioned in the space according the captures made by a Microsoft Kinect device and are composed to represent the volumes of the human body. The employment of quaternions provides a relevant speedup for the rotation of the volumes and allows to follow the human movements in real time and reduced computational cost.