1,720,985 research outputs found
Research of Innovative methodologies for the System Integration of vehicles through driving simulator
Full text linkL'uso del simulatore di guida per lo sviluppo di veicoli è un argomento attuale sia nella ricerca che nell'industria, colmando il divario tra la mera simulazione e le sensazioni e i feedback che un guidatore può sperimentare, anche prima che sia disponibile un prototipo fisico. Per System Integration, si fa riferimento al processo di combinazione e coordinamento di vari componenti, sistemi e tecnologie per creare un ambiente di simulazione driver-in-the-loop coeso e funzionale. Questa integrazione implica l'allineamento di elementi hardware e software, consentendo al simulatore di guida di replicare accuratamente scenari di guida reali in conformità con un modello veicolare affidabile. Questo lavoro si basa sulla modellazione virtuale del veicolo con un focus principale sulle sospensioni, considerando sia la cinematica che l'elasto-cinematica. Vengono proposti algoritmi e modelli che consentono sia la progettazione che l'analisi di questi sottosistemi, nonché l'integrazione con la simulazione in tempo reale. È stato sviluppato un software con interfaccia grafica, 3DSusp, per l'analisi cinematica delle sospensioni. Sono proposti modelli completi per il calcolo dei carichi sulla sospensione e per la valutazione delle cedevolezze, caratterizzate principalmente dalle boccole in gomma con proprietà rigorosamente non lineari. Vengono inoltre presentati metodi e modelli riguardanti la dinamica del veicolo, con particolare attenzione alla modellazione del differenziale LSD e agli algoritmi di stima per l'angolo di assetto e la loro integrazione con il simulatore di guida. Viene fornito un confronto tra due metodi per stimare l'angolo di assetto: uno basato su reti neurali artificiali e l'altro basato sul filtro di Kalman. Infine, viene esplorata la possibilità di estendere le simulazioni per lo sviluppo di sistemi ADAS utilizzando ViWorldSim®. In questo lavoro vengono inoltre esaminati metodi di integrazione hardware, come pad tattili e dashboard.Gli ambienti di sviluppo utilizzati per l'integrazione con il simulatore di guida sono principalmente Matlab Simulink® e ViCarRealTime®. I test online sono stati effettuati utilizzando il simulatore di guida Vi-Grade disponibile presso l'Università di Brescia.The use of a driving simulator for vehicle development is a current topic in both research and industry, bridging the gap between pure simulation and the feeling and feedback a driver may experience, even before a physical prototype is available. System integration refers to the process of combining and coordinating various components, systems, and technologies to create a cohesive and functional driver-in-the-loop simulation environment. This integration involves aligning hardware and software elements to work together seamlessly, allowing the driving simulator to accurately replicate real-world driving scenarios in accordance with a reliable vehicle model. This work is based on virtual vehicle modelling focusing mainly on suspension, considering both kinematics and elasto-kinematics. Algorithms and models are proposed that allow both the design and analysis of these subsystems, and the integration with real-time simulation. Software with a graphic interface is developed for the suspension kinematic analysis, 3DSusp. Comprehensive models are proposed for calculating the loads on the suspension and for assessing its compliance characterised by rubber bushings with strictly non-linear characteristics. Methods and models concerning vehicle dynamics are also presented, focusing on LSD differential modelling and estimation algorithms for the side slip angle and their integration with the driving simulator. A comparison of two methods for estimating the side slip angle is presented, one based on artificial neural networks, and one based on the Kalman filter. Finally, the possibility of extending simulations for the development of ADAS systems through ViWorldSim® is also explored. Methods for hardware integration such as tactile pads and dashboards are also explored in this work. The development environments used for integration with the driving simulator are mainly Matlab Simulink® and ViCarRealTime®. Online tests are conducted using the Vi-Grade driving simulator available at the University of Brescia
Una crisi economica ancora incompresa
No full textLa congiuntura e le politiche economiche adottate dai principali Paesi nel 2014 mostrano che la natura di fondo della crisi internazionale in atto dal 2007 non è ancora ben presente né nelle analisi e nelle ricette teoriche né nelle discussioni e previsioni sull'andamento della crescit
Il ritorno della sinistra in America Latina
No full textL’invasione dell’Ucraina ha rimesso in discussione gli equilibri geopolitici nel mondo. Torna a crescere l’importanza dei paesi “non allineati” anche di molti governi dell’America Latina, che sono tornati ad avere un orientamento più a sinistra, anche se una sinistra diversa dai governi della prima decade del millennio
IS 2.0 and Beyond: The Caliphate’s Communication Project
No full textSocial media, videos, online magazines, local radios, pamphlets and posters: ISIS has proven capable of adapting its communication strategy to strengthen its power locally, recruit new fighters or influence public opinion in Western and Arab nations. Not just images of war and summary executions but also constant propaganda to show that it controls its territory and is able to provide for its inhabitants’ needs.
This book – edited by Paolo Magri, ISPI director, and Monica Maggioni, RaiNews24 director – analyses the propaganda of the Islamic State, thanks to articles by researchers, communication experts and journalists. The purpose is to paint an exhaustive picture of the subject, combining meticulous examination of the historical and symbolic references in ISIS videos with careful analysis of editing and post–production techniques. In addition, the book contains materials coming from the territories controlled by the so–called caliphate. These documents provide a better understanding of the internal propaganda of the Islamic State and the strategy it uses to create a narrative of the enemy serving its ideological designs
L’Unione Europea nel mondo: perchè l’UE non può essere la grande potenza inscritta nei numeri
No full textIn un articolo su Foreign Affairs del Marzo 2017, il politologo statunitense Andrew Moravsick, adottando una prospettiva inconsueta, ha spiegato perché l’Unione europea è ancora una Superpotenza. I dati riportati da Moravcsik sono ineccepibili, come incontestabili sono l’impegno e il successo dell’UE in una serie di ambiti internazionali multilaterali tra i quali i negoziati per il cambiamento climatico, il sostegno all’istituzione e funzionamento di tribunali internazionali, la cooperazione allo sviluppo, nella quale l’UE mantiene il suo primato. Eppure qualcosa ci dice che questa descrizione del ruolo internazionale dell’UE è parziale e insufficiente per comprenderne il reale ruolo internazionale. Non si tratta tanto dell’impatto della Brexit sul peso economico internazionale del blocco europeo (che certo diminuirà, ma non tanto da perdere per questo i suoi primati), né tanto – o principalmente – del declino economico relativo rispetto a potenze emergenti (invero assai distanti dai livelli di sviluppo economico e politico dell’Europa), quanto piuttosto della capacità di utilizzare le proprie risorse di potere a fini politici. E’ su questo iato tra risorse di potere e capacità di utilizzarle a fini politici collettivi che si gioca la partita del ruolo internazionale dell’Unione. Questa capacità non solo è limitata da vincoli di architettura istituzionale, ma anche condizionata negativamente da sviluppi politici europei e internazionali che limitano capacità decisionale, credibilità e legittimità della politica estera europea
A Comprehensive Method for Computing Non-Linear Elastokinematic Properties of Passenger Car Suspension Systems: Double Wishbone Case Study
Full text linkSuspension and steering design play a major role in ensuring the correct dynamic behaviour of road vehicles. Passenger
cars are especially demanding from this point of view: NVH and ride comfort requirements often collide with active
safety-related requirements such as road holding in steady-state conditions and stability in transients. Driving pleasure is
also important for market success, therefore accurate steering feedback and predictable handling properties are additional
priorities.
Since flexible bushings are used as interface between the suspension arms and the chassis, extra degrees of freedom make
the design process a complex task. While the use of a multibody software is common practice in the industry, a dedicated
computational tool can be more practical and straightforward, especially when undertaking the design of a new suspension
concept ground-up.
The paper presents a computational methodology for the design of an independent suspension with the associated
kinematic and compliance attributes. Typical elastokinematic properties like toe, camber, wheelbase, and track variations
vs tyre forces and moments can be computed by means of a dedicated software tool. A sort of validation was performed
either by means of a comparison with a MathWorks Simscape® Multibody based model. Finally, a sensitivity analysis is
given as an example.
Computationally, the method proposed is intuitively based on the equilibrium equations. The nonlinear equations are then
solved with Newton-Raphson algorithm. The method can be also optimized for computational efficiency and is
thoroughly described so that the reader can easily replicate it in the desired programming environment
Space economy: the engine of the new space race
No full textThe dawn of the space economy can be traced back to the Cold
War and the geopolitical competition between the United
States and the Soviet Union, which has shaped both society
and politics worldwide. Since its inception, the space sector
has historically been centrally shaped by public investments
through mission-oriented policies. These policies have made
it possible to address the complex and costly process of
developing specific technologies needed to pursue objectives
of national interest. Strategic governmental and military goals
and geopolitical competition were the main drivers of public
investment in the development of launching capabilities and
satellite technologies.1
Consequently, governments have had
a profound influence on the structure and dynamics of the
space sector, acting as the main customers and funders of
private companies responsible for the development of strategic
assets
The Centrality of the Enemy in al-Baghdadi's Caliphate
No full textThe idea of analyzing the theme of conflict and the relationship with the other with reference to the self-styled Islamic State (IS) - in Arabic Dawla al-Islamiyya or also Dawla Islamiyya fi Iraq wa Sham (Islamic State of Iraq and the Levant - Isil/Isis or Daish) – may appear as a merely rhetorical, almost tautological exercise. The violence underlying IS activities and its all-out expansionist attitude are, indeed, the aspects that most significantly characterize the action of the movement under the leadership of Abu Bakr al-Baghdadi, also in light of the fact that IS makes no distinction between adversaries (inimicus) and enemies (hostis). IS leaves no room whatsoever to the right of existence of others in a shared social or political space, outside of submission and deprivation. This principle inspires the IS narrative starting from its peculiar concept of caliphate, as clearly explained in the previous chapter, all the way to the definition and relationship with the “other”.
This is true not only with regard to the non-Muslim world, but also towards the Muslim universe itself, as shown by the constant application of takfir, and for those jihadists who are not willing to recognize the authority of the “new caliph”. It is clear that any diversity, otherness or juxtaposition, either internal or external to the world in which these subjects operate, falls within the category of the enemy rather than the adversary.
The pages that follow aim reflect on the concept of the caliphate in the IS message and to provide an analysis of the relationship that IS has established between the enemy – in its numerous guises – and media communication. More specifically, it will focus on the identification of the ultimate target of the group’s violence and why it was lumped into the category of the hostis. Interestingly, IS has not only achieved results in the field, but it was able to resound its overbearing message through a careful representation of the enemy as humiliated and defeated. With a view to fueling this vision of the enemy, IS was careful to synchronize its activities across the local regional and international dimensions, while also engaging in a campaign for recruitment and an effort to spread terror across the board
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