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On Electrohydraulic Pressure Control for Power Steering Applications
This thesis deals with the Electrohydraulic Power Steering system for road vehicles, using electronic pressure control valves. With an ever increasing demand for safer vehicles and fewer traffic accidents, steering-related active safety functions are becoming more common in modern vehicles. Future road vehicles will also evolve towards autonomous vehicles, with several safety, environmental and financial benefits. A key component in realising such solutions is active steering. The power steering system was initially developed to ease the driver's workload by assisting in turning the wheels. This is traditionally done through a passive open-centre hydraulic system and heavy trucks must still ...
Fluid Power Pumps and the Electrification
More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. Hydraulic systems have looked similar for a long time, but now there is an opportunity to advance. Many things change when a diesel engine is replaced with an electric motor. For example, variable-speed control becomes more relevant, electric regeneration becomes possible, and the use of multiple prime movers becomes an attractive alternative. The noise from the hydraulic system will also be more ...
Tools and Methods for Analysis, Debugging, and Performance Improvement of Equation-Based Models
Equation-based object-oriented (EOO) modeling languages such as Modelica provide a convenient, declarative method for describing models of cyber-physical systems. Because of the ease of use of EOO languages, large and complex models can be built with limited effort. However, current state-of-the-art tools do not provide the user with enough information when errors appear or simulation results are wrong. It is of paramount importance that such tools should give the user enough information to correct errors or understand where the problems that lead to wrong simulation results are located. However, understanding the model translation process of an EOO compiler is a daunting task that not only ...
I MIEI TRE UOMINI 2
Quando iniziai a scrivere il libro "I miei tre uomini" lo feci con entusiasmo e spensieratezza, divertendomi, con l'intenzione di aggiornare un diario di bordo famigliare che un giorno avrei lasciato ai miei figli, mai e poi mai però avrei pensato di riuscire a scrivere un secondo libro...
A Jew at the Medici Court
Edward Goldberg shares his sensational discovery of the largest body of surviving correspondence from any Jew in Early Modern Europe. Over the course of six years, Benedetto Blanis — a scholar and entrepreneur in the Florentine Ghetto — wrote nearly 200 letters to his princely patron Don Giovanni dei Medici. For the first time, these letters are available in a definitive critical edition — with full transcriptions in the original Italian, English language summaries, and explanatory notes. This book is a companion volume to Jews and Magic in Medici Florence, in which Goldberg narrates Blanis's startling rise and fall. Readers can now take a step closer and hear Blanis's compelling story in his own words — tracing his fraught relations with Jews and Christians, his desperate (and often illegal) business schemes, his disastrous strategies for advancement at the Medici Court, and his pursuit of arcane knowledge, including astrology, alchemy, and Kabbalah.
Storie meravigliose di giovani greci
«Agli inizi non gli fu facile far capire al mondo quanta audacia, quanta forza vi fosse nei suoi anni acerbi. Alessandro era appena subentrato al padre sul trono di Macedonia – aveva soltanto vent'anni – che le città greche credettero di poter approfittare della sua giovane età per recuperare la libertà perduta. Non era altro che un páis, un meirákion, ripetevano: un 'bambinone', un 'ragazzotto'. Dovettero ricredersi tutti molto presto.» La Grecia che abbiamo imparato a conoscere e ad amare dall'epica, dalla tragedia, dalla storia è ricchissima di straordinarie figure di giovani uomini e giovani donne. Achille è l'eroe che a una vita lunga e incolore preferì la brevità di un'e...
Control Aspects of Complex Hydromechanical Transmissions
This thesis deals with control aspects of complex hydromechanical transmissions. The overall purpose is to increase the knowledge of important aspects to consider during the development of hydromechanical transmissions to ensure transmission functionality. These include ways of evaluating control strategies in early design stages as well as dynamic properties and control aspects of displacement controllers, which are key components in these systems. Fuel prices and environmental concerns are factors that drive research on propulsion in heavy construction machinery. Hydromechanical transmissions are strong competitors to conventional torque-converter transmissions used in this application tod...
