Search results for "SPAZI"
showing 10 items of 630 documents
Optimization design process of a morphing winglet
2018
Aeronautic and aerospace engineering is recently moving in the direction of developing morphing wing devices, with the aim of making adaptable the aerodynamic shapes to different operational conditions. Those devices may be classified according to two different conceptual architectures: kinematic or compliant systems. Both of them embed within their body all the active components (actuators and sensors), necessary to their operations. In the first case, the geometry variation is achieved through an augmented classical mechanism, while in the second case the form modification is due to a special arrangement of the inner structure creating a distributed elastic hinges arrangement. Whatever is…
Evaluation of aging behavior under salt-fog spray conditions of green sandwich structures
2018
In this paper, the aging resistance of sandwich structures made with cork agglomerate as core and flax-reinforced polymeric laminates as face sheets was investigated for the first time. In order to evaluate their durability in a hostile environment, a sandwich plate was manufactured by vacuum bagging technique and aged under salt-fog spray conditions, according to ASTM B 117 standard. The evolution of the sandwich mechanical properties during the aging exposition was analyzed by carrying out quasi-static flexural tests and Charpy impact tests both on unaged specimens and on specimens aged for 10, 25, and 60 days, respectively. The quasi-static experimental results showed that despite the sa…
An experimental investigation on air quality inside WindJet aircraft
2012
ABSTRACT In order to improve the passengers and crew comfort during the flight, the aim of the present paper is a study of the cabin air quality through experimental measures on randomly selected flight segments of an Italian airline company, WindJet. Carbon dioxide, ultrafine particles, temperature and relative humidity have been measured by using low cost high efficiency instrumental equipments. Exploring ways to improve aircraft cabin air quality, WindJet and University of Palermo are investigating equipment, filters and components of the ventilation system. In this paper, after description of both ventilation systems for aircrafts of WindJet and the instrumental equipments used to measu…
Risk Assessment of Fuel Quantity Indicator Replacement in ATR72 Aircraft
2015
Aircraft maintenance activities are rife with opportunities for error. The concurrent in-flight failure of all of the engines of a non-scheduled airline flight and the following list of human lives highlight one of these opportunities. As commonly recognized among flight operators, each flight safety agency follows the criteria of the International Civil Aviation Organization Annex 16 in which all the evidences of the technical investigation pave the way for avoiding future flight accidents or incidents. On the other hand, when the Italian penal procedure code was applied for the Tuninter aircraft ATR 72 (identification code TS-LBB) crash at issue on 6 August 2005 near Palermo (Italy), the…
DEVELOPMENT AND APPLICATIONS OF A VIRTUAL HYBRID PLATFORM FOR MULTISCALE ANALYSIS OF ADVANCED STRUCTURES OF AIRCRAFT (DEVISU)
2022
This paper outlines the main findings of the project “DEvelopment and applications of a VIrtual hybrid platform for multiscale analysis of advanced StructUres of aircraft” (DEVISU), which deals with failure of composite structures and noise/vibration reduction, along with investigation of new materials for aerospace applications.
Computational Analysis of the Active Control of Incompressible Airfoil Flutter Vibration Using a Piezoelectric V-Stack Actuator
2021
The flutter phenomenon is a potentially destructive aeroelastic vibration studied for the design of aircraft structures as it limits the flight envelope of the aircraft. The aim of this work is to propose a heuristic design of a piezoelectric actuator-based controller for flutter vibration suppression in order to extend the allowable speed range of the structure. Based on the numerical model of a three degrees of freedom (3DOF) airfoil and taking into account the FEM model of a V-stack piezoelectric actuator, a filtered PID controller is tuned using the population decline swarm optimizer PDSO algorithm, and gain scheduling (GS) of the controller parameters is used to make the control adapti…
Margini e interstizi vegetati per una città resiliente
2021
La mancanza di vegetazione all’interno delle nostre città e, soprattutto, dei centri storici determina oggi, alla luce dei cambiamenti climatici in corso, notevoli problematiche tra le quali vanno annoverate – tra quelle più gravi – l’impossibilità di contrastare efficacemente le ondate di calore, sempre più frequenti in ambito Mediterraneo, con conseguente aumento dei consumi energetici degli edifici dovuti alla necessità di garantire il comfort indoor e l’incapacità di rallentare il deflusso delle acque meteoriche che a causa degli eventi di pioggia estremi e dell’impermeabilità dei suoli rendono sempre più inefficaci i sistemi di drenaggio urbano esistenti. L’utilizzo della vegetazione c…
Hierarchical-ACA DBEM for Anisotropic Three-Dimensional Time-Harmonic Fracture Mechanics
2012
A hierarchical BEM solver for the analysis of three-dimensional anisotropic time-harmonic fracture mechanics problems is presented. A thorough investigation on the relations and interactions between the numerically computed anisotropic fundamental solutions and the algorithm used to approximate the blocks of the hierarchical matrix, namely Adaptive Cross Approximation, is carried out leading to the employed computational strategy. The use of the hierarchical matrices and iterative solvers is proved as an effective technique for speeding up the solution procedure and reducing the required memory storage in time-harmonic three-dimensional anisotropic fracture mechanics problems.
Paesaggi stranieri. La costruzione spaziale dell’Altro
2009
La costruzione dell'altro attraverso la sua rappresentazione spaziale
Less is Home. Antropologie dello spazio domestico
2014
Per due milioni di anni abbiamo vissuto a contatto con il fuori, non nel buio delle grotte, ma in luoghi intermedi tra il chiuso e l’aperto: spalle alla roccia, occhi nella valle. Pochi secoli di civiltà industriale e di urbanesimo soffocante ci hanno abituato a vivere in scatole da scarpe. Tutto l’abitare va ripensato da qui, dalla constatazione che eravamo fatti per praterie e foreste, che ci piaceva e ancora ci piace vivere nell’aperto, che facevamo case temporanee, leggere, che avevamo di meno e immaginavamo di più. Sono le esperienze più estreme, quelle del limite e del lontano, che hanno qualcosa da dire sul fare casa oggi: capanne, bivacchi, tende, rifugi, ripari di fortuna, un’archi…