Search results for "COSTRUZIONE"
showing 10 items of 669 documents
Machine learning at the interface of structural health monitoring and non-destructive evaluation
2020
While both non-destructive evaluation (NDE) and structural health monitoring (SHM) share the objective of damage detection and identification in structures, they are distinct in many respects. This paper will discuss the differences and commonalities and consider ultrasonic/guided-wave inspection as a technology at the interface of the two methodologies. It will discuss how data-based/machine learning analysis provides a powerful approach to ultrasonic NDE/SHM in terms of the available algorithms, and more generally, how different techniques can accommodate the very substantial quantities of data that are provided by modern monitoring campaigns. Several machine learning methods will be illu…
Laser Ultrasonics Inspection of Train Wheel - Evaluation of Optimized Setup
2021
In the railway field, the safety of passengers and the service life of train components are a crucial issue. For this reason, continuous periodic inspections by non-destructive techniques are required. Among these, ultrasonic tests are widely used in this field, even though the conventional ultrasound techniques have the disadvantage of requiring the disassembly of the wheels and of putting the train out of service. This procedure is expensive and time-consuming and can be neglected if non-contact ultrasonic techniques are used. In this work, the authors present an experimental research on some defects, artificially obtained on a railway wheel supplied by Trenitalia Spa, by adopting three d…
Introduzione e cura della sezione monografica "Metafisica in J. Derrida" del Giornale di Metafisica
2014
Si introduce e si cura una riflessione a sei voci sull'interpretazione derridiana di temi di fondo della metafisica
STRATEGIE PER LA RIQUALIFICAZIONE ENERGETICA DELL’EDILIZIA SCOLASTICA IN CLIMA MEDITERRANEO
2018
Il patrimonio edilizio italiano è composto principalmente da costruzioni realizzate nel secondo dopoguerra, quando la speculazione economica e l’urbanizzazione hanno prodotto edifici con caratteristiche di scarsa qualità architettonica ed energetica. Agire sul rendimento energetico degli edifici esistenti, adattandoli alle caratteristiche richieste dalla normativa, a parità di condizioni di comfort, rappresenta una strategia importante per la riduzione dei consumi energetici e per la tutela dell’ambiente. Attraverso l’applicazione di tecnologie e metodologie innovative e la scelta di investimenti adeguati, il retrofit energetico può rappresentare, oggi, la principale opportunità di crescita…
NUMERICAL-EXPERIMENTAL METHOD FOR THE ANALYSIS OF RESIDUAL STRESSES IN COLD-EXPANDED HOLES
2012
Hole cold expansion is a technique widely used to improve the fatigue life of components with holes, e.g. bolted or riveted joints. As it has been demonstrated in literature by analytical, numerical and experimental analyses carried out by several authors, the compressive residual stresses introduced by the hole cold expansion have a beneficial influence on both the static and the fatigue strength of the treated component, because they reduce significantly the typical stress peaks around the hole due to stress concentration. In the literature, various analyses of the residual stresses introduced by the hole cold expansion have been performed by using several methods such as X-ray diffractio…
Measuring Inaccessible Residual Stresses Using Multiple Methods and Superposition
2010
The traditional contour method maps a single component of residual stress by cutting a body carefully in two and measuring the contour of the cut surface. The cut also exposes previously inaccessible regions of the body to residual stress measurement using a variety of other techniques, but the stresses have been changed by the relaxation after cutting. In this paper, it is shown that superposition of stresses measured post-cutting with results from the contour method analysis can determine the original (pre-cut) residual stresses. The general superposition theory using Bueckner’s principle is developed and limitations are discussed. The procedure is experimentally demonstrated by determini…
Experimental assessment of the shield-to-salt-fog properties of basalt and glass fiber reinforced composites in cork core sandwich panels applications
2018
Abstract In this paper, the effect of salt-fog exposition on the mechanical behavior of sandwich panels having cork agglomerate core was investigated. In particular, the aim of this research work is to assess the shield function of unidirectional basalt and E-glass reinforced polymer on the aging and failure mechanism of the core when such class of material are destined to operate in hostile environments (e.g., marine environment). To do this, the manufactured sandwich panels were exposed up to 60 days to salt-fog environment, according to ASTM B 117 standard. Unaged and aged specimens were analyzed through three point bending tests after aging time of 10, 25 and 60 days. Digital Image Corr…
Un'opera giovanile di Giuseppe Damiani Almeyda: il caffè del 1859. Dal disegno d'archivio alla visualizzazione digitale.
2011
Un progetto giovanile di G. Damiani Almeyda è stato ricostruito a partire dalla tavola conservata nell'archivio Damiani. Dalla pianta e dal prospetto presenti nella tavola sono state desunte le informazioni necessarie all'analisi geometrica e volumetrica, alla costruzione di un modello tridimensionale e alla realizzazione di viste prospettiche renderizzate.
Un disegno per il “parlatoio” della Badia di Santa Lucia a Siracusa
2022
A drawing for the "parlatoio" of the Abbey of Santa Lucia in Syracuse A drawing attached to a document, dates back to 1838 kept in the Syracuse State Archives, shows the project for a space located next to the church of the Badia di Santa Lucia. A neo-greek style construction, called “parlatoio” is characterized by a cylindrical space covered with a coffered dome supported by fluted doric columns. The drawing is signed by the engineer Ignazio Giarrusso, known as a bridge designer, which here however deals with the construction of the dome. The choice of adopting a neoclassical language in a late phase was rare in this area of Sicily; here these choices belong to secondary professionals and …
Documenti per la storia dell'architettura
2016
Il volume nasce dall'esigenza di accrescere, attraverso apporti nuovi e originali, la conoscenza del cantiere siciliano di età moderna, a partire dai documenti di archivio. Il glossario dell'edilizia che si presenta raccoglie, per la prima volta, numerosi termini tecnici utilizzati nel lessico della costruzione storica in Sicilia tra XV e XVIII secolo. Si tratta di un primo repertorio di vocaboli desunti da un vasto corpus documentario, frutto di un sistematico lavoro di analisi e di interpretazione. Le "parole" del cantiere celano molteplici informazioni sulla provenienza dei maestri, sui modelli progettuali, sulle tecniche costruttive ecc. La lingua parlata dalle maestranze così come emer…