Search results for "SPAZI"

L’albero Falcone: legalità e bellezza (Palermo, 1992-2020)

2021

Il saggio è incentrato sull’Albero Falcone davanti la casa del magistrato divenuto simbolo della resistenza alla mafia, emblema del riscatto della società civile e di legalità dopo l’attentato (1992). A partire da una fortissima ondata emozionale l’albero ha profondamente contraddistinto il luogo segnandone l’identità. Ne rappresenta il senso più profondo – la legalità – perché le persone lo hanno reso tale e in modo assolutamente spontaneo, condividendo le loro sensazioni. Hanno creato sull’onda di una fortissima e violenta spinta emozionale un luogo di incontro, non solo fisico, ma anche ideale, che continua emotivamente a coinvolgere non solo sul piano personale, ma anche a livello colle…

A fast 3D BEM for anisotropic elasticity based on hierarchical matrices

2008

In this paper a fast solver for three-dimensional anisotropic elasticity BEM problems is developed. The technique is based on the use of hierarchical matrices for the representation of the collocation matrix and uses a preconditioned GMRES for the solution of the algebraic system of equations. The preconditioner is built exploiting the hierarchical arithmetic and taking full advantage of the hierarchical format. The application of hierarchical matrices to the BEM solution of anisotropic elasticity problems has been numerically demonstrated highlighting both accuracy and efficiency leading to almost linear computational complexity.

Hierarchical-ACA DBEM for anisotropic three-dimensional time-domain fracture mechanics

2012

Spazio, forma, materia, contesto. La lezione perpetua di Távora

2022

Fernando Távora è certamente l’iniziatore, il fondatore e l’ideatore di ciò che è riconosciuta come la Scuola di Architettura di Porto. Una Scuola espressione, oggi, di una palingenesi dell’architettura portoghese contemporanea e, forse, senza esagerazione, di un neo-rinascimento architettonico mondiale a cavallo tra il XX e il XXI secolo. Il magister per eccellenza, colui che traccia il primo solco della strada che sarà, in seguito, percorsa dai Discenti - Alvaro Siza Vieira ed Eduardo Souto de Moura - ma con la visione duplice e antitetica di chi sa che la meta si raggiunge volgendo costantemente lo sguardo in avanti e, nel contempo, indietro, al proprio vissuto formativo e al lascito del…

Micro damage and cracking in fibre reinforced composites by a novel hybrid numerical technique

2020

Article number 0033974 AIP Incluida en Conference Proceedings 2309 The prediction of failure mechanisms in fibre-reinforced composite materials is of great importance for the design of composite engineering applications. With the aim of providing a tool able to predict and explain the initiation and propagation of damage in unidirectional fiber reinforced composites, in this contribution we develop a micromechanical numerical model based on a novel hybrid approach coupling the virtual element method (VEM) and the boundary element method (BEM). The BEM is a popular numerical technique, efficient and accurate, which has been successfully applied to interfacial fracture mechanics problems of f…

Modal and Structural FEM Analysis of a 50 ft Pleasure Yacht

2012

In this paper a structural Finite Element analysis of a 50 ft pleasure vessel is presented. The study is performed under different loads conditions: modal analyses have been done in order to find the natural frequencies of the vessel, structural analyses to verify the strength of the vessel to design loads. The design loads for the vessel considered are computed according to RINA rules for the construction and classification of pleasure vessels [1]. Two different composites are used for the lamination: one is a monolithic sequence of short fibre and balanced glass lamina, used for the bottom of the vessel and for structural reinforcements, the other is a sandwich made of glass fibre composi…

A computational study on crack propagation in bio-inspired lattices

2018

A computational preliminary study on the fracture behaviour of two kinds of finite-size bio-inspired lattice configurations is presented. The study draws inspiration from recent investigations aimed at increasing the fracture energy of some materials through small modifications of their microstructure. Nature provides several examples of strategies used to delay or arrest damage initiation and crack propagation. Striking examples are provided by the micro- architecture of several kinds of wood. In this study, the effects on crack propagations induced by architectural alterations inspired by the microstructure of wood are computationally investigated. In an age in which tight control of the …

Finite elements for nonlinear free vibrations analysis of smart laminates subjected to in-plane loadings

2015

Advanced composites, able to provide multi-functional capabilities besides the traditional structural functions, has been gaining attention in many technological fields. This inherent coupling of different physical fields can be exploited in transducer applications, structural health monitoring, vibration control, energy harvesting and other applications. Magneto-electro-elastic (MEE) composite materials are attracting increasing consideration as they couple mechanical, electrical and magnetic fields and this makes them particularly suitable for smart applications. Generally, single-phase materials exhibit either piezoelectric or piezomagnetic behavior and no direct magneto-electric couplin…

Nonlinear model based particle swarm optimization of PID shimmy damping control

2016

The present study aims to investigate the shimmy stability behavior of a single wheeled nose landing gear system. The system is supposed to be equipped with an electromechanical actuator capable to control the shimmy vibrations. A Proportional-Integrative-Derivative (PID) controller, tuned by using the Particle Swarm Optimization (PSO) procedure, is here proposed to actively damp the shimmy vibration. Time-history results for some test cases are reported and commented. Stochastic analysis is last presented to assess the robustness of the control system.

Geometrie sociali della (post)modernità. Aggregazioni, disgregazioni, segregazioni nello spazio sociale contemporaneo

2012

La “crisi” sembra essere il leitmotiv dei discorsi che nel quotidiano vengono intrapresi dall’attore sociale, qualunque sia il ruolo che questi svolge nei diversi sistemi sociali, ai quali sempre meno sente di appartenere. La sociologia sta riflettendo non solo sulla crisi economica e sociale che connota il momento storico che stiamo vivendo, ma anche, e soprattutto in questi ultimi anni, sulla stessa crisi che come disciplina sta attraversando. Se per un verso, infatti, le si riconosce da più parti, non senza qualche appunto critico, la capacità di dotarsi di uno statuto e di un ruolo “dentro” le istituzioni, il compito che appare sempre più arduo è piuttosto quello, classico, di comprende…