Mirco Natali, Agnese Amati, Nicola Demitri, Elisabetta Iengo,
The novel conjugate 1, featuring two l-tyrosinato residues axially coordinated to the tin centre of a Sn(iv)-tetraphenylporphyrin, is reported as the first example of a supramolecular dyad for photochemical PCET. It is noteworthy that the excitation of 1 in the presence of a suitable base is followed by photoinduced PCET leading to a radical pair state with a surprisingly long lifetime.
Tópico(s): Photochemistry and Electron Transfer Studies
2018 - Royal Society of Chemistry | Chemical Communications
Mirjam Amati, Nicola Grignoli, Sara Rubinelli, Julia Amann, Claudia Zanini,
The communication of prognosis represents an ethical and clinical challenge in medical practice due to the inherent uncertain character of prognostic projections. The literature has stressed that the mode of communicating prognoses has an impact on patients' hope, which is considered to play a major role in adapting to illness and disability. In light of this, this study aims to explore health professionals' (HPs) perceptions of the role of hope in rehabilitation and to examine if and how they use ...
Tópico(s): Optimism, Hope, and Well-being
2019 - Public Library of Science | PLoS ONE
Nicola Amati, Xavier de Lépine, Andrea Tonoli,
A new model of electrodynamic bearings is presented in this paper. The model takes into account the R-L dynamics of the eddy currents on which this type of bearing is based, making it valid for both quasistatic and dynamic analyses. In the quasistatic case, the model is used to obtain the force generated by an off-centered shaft rotating at a fixed speed in a constant magnetic field. The model is then used to analyze the dynamic stability of a Jeffcott rotor supported by electrodynamic bearings. ...
Tópico(s): Tribology and Lubrication Engineering
2008 - American Society of Mechanical Engineers | Journal of vibration and acoustics
The interest in eddy current dampers is increasing especially in aeronautic and automotive industry. Such devices seem to be a valid alternative to conventional fluid film and viscoelastc dampers. Even if several papers have been published on this topic, an electromechanical model taking into account both the resistance and the inductance of the conductor is still lacking. The aim of the present paper is to model the electromagnetic interaction of an eddy current device operating as a damper or ...
Tópico(s): Magnetic Bearings and Levitation Dynamics
2008 - American Society of Mechanical Engineers | Journal of vibration and acoustics
Giancarlo Genta, Nicola Amati,
The hysteretic damping model cannot be applied to time domain dynamic simulations: this is a well-known feature that has been discussed in the literature since the time when analog computers were widespread. The constant equivalent damping often introduced to overcome this problem is also discussed, and its limitations are stated, in particular those linked with its application in rotordynamics to simulate rotating damping. An alternative model based on the nonviscous damping (NVD) model, but with ...
Tópico(s): Tribology and Lubrication Engineering
2010 - Elsevier BV | Journal of Sound and Vibration
Andrea Tonoli, Nicola Amati, Angelo Bonfitto, Mario Silvagni, Bernard Staples, Evgueni V. Karpenko,
The vibration control of rotors for gas or steam turbines is usually performed using passive dampers when hydrodynamic bearings are not used. In layouts where the rotating parts are supported by rolling bearings, the damping is usually provided by squeeze film dampers. Their passive nature and the variability of their performances with temperature and frequency represent the main disadvantages. Dampers with magnetorheological and electrorheological fluid allow solving only a part of the abovementioned ...
Tópico(s): Vibration Control and Rheological Fluids
2010 - ASM International | Journal of Engineering for Gas Turbines and Power
Nicola Amati, Andrea Tonoli, Aldo Canova, Fábio Cavalli, M. Padovani,
Eddy-current devices are promising for the passive and semi-active control of vibrations. From the electromechanical point of view, their behavior is characterized by the torque-to-speed curve and the mechanical impedance. In this paper, we report an investigation of the electromechanical behavior of eddy-current dampers/couplers consisting of permanent magnets and a massive conductor. Our goal was to determine the influence of the main design parameters on the torque-to-speed characteristic and ...
Tópico(s): Electric Motor Design and Analysis
2007 - IEEE Magnetics Society | IEEE Transactions on Magnetics
Nicola Amati, Andrea Festini, Luigi Pelizza, Andrea Tonoli,
The present paper describes the study of the stability in the straight running of a three-wheeled tilting vehicle for urban and sub-urban mobility. The analysis was carried out by developing a multibody model in the Matlab/SimulinkSimMechanics environment. An Adams-Motorcycle model and an equivalent analytical model were developed for the cross-validation and for highlighting the similarities with the lateral dynamics of motorcycles. Field tests were carried out to validate the model and identify ...
Tópico(s): Mechanical Engineering and Vibrations Research
2011 - Taylor & Francis | Vehicle System Dynamics
Nicola Amati, Andrea Festini, Andrea Tonoli,
Abstract Electromechanical dampers seem to be a valid alternative to conventional shock absorbers for automotive suspensions. They are based on linear or rotative electric motors. If they are of the DC-brushless type, the shock absorber can be devised by shunting its electric terminals with a resistive load. The damping force can be modified by acting on the added resistance. To supply the required damping force without exceeding in size and weight, a mechanical or hydraulic system that amplifies ...
Tópico(s): Magnetic Bearings and Levitation Dynamics
2011 - Taylor & Francis | Vehicle System Dynamics
Andrea Tonoli, Nicola Amati, Fabrizio Impinna, Joaquim Girardello Detoni,
Electrodynamic bearings are a kind of passive magnetic bearings based on eddy currents that develop between a rotating conductor and a static magnetic field. Relative to active magnetic bearings, their passive nature implies several advantages such as the reduced complexity, improved reliability, and smaller size and cost. Electrodynamic bearings have also drawbacks such as the difficulty in ensuring a stable levitation in a wide speed range. The most common solution to improve the stability is ...
Tópico(s): Adhesion, Friction, and Surface Interactions
2011 - American Society of Mechanical Engineers | Journal of vibration and acoustics
Andrea Tonoli, Nicola Amati, Enrico Zenerino,
Multiribbed serpentine belt drive systems are widely adopted in accessory drive automotive applications due to the better performances relative to the flat or V-belt drives. Nevertheless, they can generate unwanted noise and vibration which may affect the correct functionality and the fatigue life of the belt and of the other components of the transmission. The aim of the paper is to analyze the effect of the shear deflection in the rubber layer between the pulley and the belt fibers on the rotational ...
Tópico(s): Gear and Bearing Dynamics Analysis
2006 - American Society of Mechanical Engineers | Journal of vibration and acoustics
Joaquim Girardello Detoni, Fabrizio Impinna, Andrea Tonoli, Nicola Amati,
A model of passive electrodynamic bearings based on the R–L dynamics of the eddy currents inside a conductor is presented. The model is derived from an analytical solution of the magnetic field in the air region surrounding the rotor for electrodynamic bearings having an even number of magnetic pole pairs. It allows homopolar and heteropolar electrodynamic bearings to be considered in a single unified way that accounts for the electromechanical interactions between the rotating conductor and the ...
Tópico(s): Adhesion, Friction, and Surface Interactions
2012 - Elsevier BV | Journal of Sound and Vibration
Fabrizio Impinna, Joaquim Girardello Detoni, Nicola Amati, Andrea Tonoli,
The present paper presents a new modeling approach for null flux axial electrodynamic bearings. Such approach allows defining stability bounds for rotors supported with this type of passive magnetic suspension. The linearized models are developed using the bond graph methodology to better understand the multiphysics nature of the magnetic suspension. The adoption of complex variables together with the bond graph formalism is introduced in order to reduce the complexity of the system's equations. ...
Tópico(s): Vibration Control and Rheological Fluids
2012 - IEEE Magnetics Society | IEEE Transactions on Magnetics
Renato Galluzzi, Andrea Tonoli, Nicola Amati,
The implementation of variable damping systems to increase the adaptability of mechanical structures to their working environment has been gaining increasing scientific interest, and numerous attempts have been devoted to address vibration control by means of active and semi-active devices. Although research results seem promising in some cases, the proposed solutions are often not able to fulfill requirements in terms of compactness and simplicity on one hand, and dynamic performance on the other. ...
Tópico(s): Vehicle Dynamics and Control Systems
2014 - American Society of Mechanical Engineers | Journal of vibration and acoustics
Sara Luciani, Angelo Bonfitto, Nicola Amati, Andrea Tonoli,
This paper presents a method to design a Model Predictive Control to maximize the passengers’ comfort in assisted and self-driving vehicles by achieving lateral and longitudinal dynamic. The weighting parameters of the MPC are tuned off-line using a Genetic Algorithm to simultaneously maximize the control performance in the tracking of speed profile, lateral deviation and relative yaw angle and to optimize the comfort perceived by the passengers. To this end, two comfort evaluation indexes extracted ...
Tópico(s): Ergonomics and Musculoskeletal Disorders
2014 - SAGE Publishing | Advances in Mechanical Engineering
Andrea Tonoli, Nicola Amati, Joaquim Girardello Detoni, Renato Galluzzi, Enrico Gasparin,
Electromechanical vehicle suspension systems represent a promising substitute to conventional hydraulic solutions. However, the design of electromechanical devices that are able to supply high damping forces without exceeding geometric dimension and mass constraints is a difficult task. All these challenges meet in off-road vehicle suspension systems, where the power density of the dampers is a crucial parameter. In this context, the present paper outlines a particular shock absorber configuration ...
Tópico(s): Vehicle Dynamics and Control Systems
2013 - Taylor & Francis | Vehicle System Dynamics
Joaquim Girardello Detoni, Qingwen Cui, Nicola Amati, Andrea Tonoli,
Eddy current dampers (ECD) can be used to introduce damping in rotordynamic applications. ECDs are contactless in nature and can be made to introduce negligible drag force, thus being a perfect match for passive magnetic bearings such as permanent magnet bearings and superconducting bearings. However, modeling and estimating the amount of damping introduced by an ECD is a difficult task due to complicated geometry and working conditions. The present study presents a novel method for modeling and ...
Tópico(s): Brake Systems and Friction Analysis
2016 - Elsevier BV | Journal of Sound and Vibration
Renato Galluzzi, Andrea Tonoli, Nicola Amati, Gabriele Curcuruto, Piero Conti, Giordano Greco, Andrea Nepote,
The development of suspension systems has seen substantial improvements in the last years due to the use of variable dampers. Furthermore, the efficiency increase in the subsystems within the automotive chassis has led to the use of regenerative solutions, in which electric machines can be employed as generators to recover part of the energy otherwise dissipated. However, the harvesting capability of regenerative suspensions is often limited by friction and inertial phenomena. The former ones waste ...
Tópico(s): Innovative Energy Harvesting Technologies
2016 - | SAE technical papers on CD-ROM/SAE technical paper series
Luca Castellazzi, Andrea Tonoli, Nicola Amati, Enrico Galliera,
Vehicle driveability describes the complex interactions between the driver and the vehicle, mainly related to longitudinal vibrations. Today, a relevant part of the driveability process optimisation is realised by means of track tests, which require a considerable effort due to the number of parameters (such as stiffness and damping components) affecting this behaviour. The drawback of this approach is that it is carried on at a stage when a design iteration becomes very expensive in terms of time ...
Tópico(s): Vehicle Noise and Vibration Control
2017 - Taylor & Francis | Vehicle System Dynamics
Renato Galluzzi, Yi‐Jun Xu, Nicola Amati, Andrea Tonoli,
The constant need to reduce emissions in the automotive sector has driven the electrification of powertrain and chassis. To comply with this trend and decrease the bound even further, the present paper proposes the use of hydraulic regenerative shock absorbers for automotive suspension systems. The conversion of linear into angular motion and the suitable control of an integrated electric machine allow to transform part of the vibrational energy into electricity. In these damping devices, the key ...
Tópico(s): Magnetic Bearings and Levitation Dynamics
2017 - Elsevier BV | Applied Energy
Jyotishman Ghosh, Andrea Tonoli, Nicola Amati,
Tópico(s): Brake Systems and Friction Analysis
2018 - | SAE technical papers on CD-ROM/SAE technical paper series
Angelo Bonfitto, Luis M. Castellanos Molina, Andrea Tonoli, Nicola Amati,
This paper presents the study of linear Offset-Free Model Predictive Control (OF-MPC) for an Active Magnetic Bearing (AMB) application. The method exploits the advantages of classical MPC in terms of stability and control performance and, at the same time, overcomes the effects of the plant-model mismatch on reference tracking. The proposed approach is based on a disturbance observer with an augmented plant model including an input disturbance estimation. Besides the abovementioned advantages, this ...
Tópico(s): Tribology and Lubrication Engineering
2018 - Multidisciplinary Digital Publishing Institute | Actuators
Angelo Bonfitto, Stefano Feraco, Andrea Tonoli, Nicola Amati, Francesco Monti,
This paper presents a tradeoff analysis in terms of accuracy and computational cost between different architectures of artificial neural networks for the State of Charge (SOC) estimation of lithium batteries in hybrid and electric vehicles. The considered layouts are partly selected from the literature on SOC estimation, and partly are novel proposals that have been demonstrated to be effective in executing estimation tasks in other engineering fields. One of the architectures, the Nonlinear Autoregressive ...
Tópico(s): Control Systems and Identification
2019 - Multidisciplinary Digital Publishing Institute | Batteries
Angelo Bonfitto, Ran Gabai, Andrea Tonoli, Luis M. Castellanos Molina, Nicola Amati,
This paper presents a resonant inductive sensor for radial displacement in Active Magnetic Bearing (AMB) systems. The device consists of a wire coil wound around a tooth of a conventional eight-pole radial actuator of the bearing. The proposed device is different from standard inductive sensor schemes since the sensing coil is excited by the electromagnetic field generated by the actuation coil and not by an external oscillator. The electromagnetic flux linked by the sensing coil is a function of ...
Tópico(s): Electric Motor Design and Analysis
2019 - Elsevier BV | Sensors and Actuators A Physical
Renato Galluzzi, Nicola Amati, Andrea Tonoli,
The use of hysteresis motors nowadays is limited to few niche-focused applications. Nevertheless, their intrinsic features make them ideal for next-generation high-speed machinery. Hysteresis motors are highly nonlinear and their behavior is heavily influenced by the initial magnetization state of the rotor active part. As such, the exploitation of hysteresis machine technology requires a reliable method to assess the torque capability, both numerically and experimentally. This paper proposes a ...
Tópico(s): Magnetic Bearings and Levitation Dynamics
2019 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Electronics
Federico Tessari, Renato Galluzzi, Nicola Amati,
Abstract Gerotor machines are internal gear hydraulic devices that present numerous performance benefits with respect to other topologies. For this reason, they find their application in high-efficiency mechatronic devices, such as electro-hydrostatic actuators. When designing gerotor machines either as a motor or pump, there are numerous parameters to choose, with different influences on the mechanical and volumetric efficiency behavior. Some of these aspects have been addressed in previous research ...
Tópico(s): Control Systems in Engineering
2019 - American Society of Mechanical Engineers | Journal of Mechanical Design
Angelo Bonfitto, Stefano Feraco, Andrea Tonoli, Nicola Amati,
This paper presents an Artificial Neural Network based algorithm to estimate the sideslip angle of a vehicle in different road conditions. The method is based on two parallel tasks: (a) estimation of the sideslip angle in three road conditions, namely dry, wet and icy, by means of three separate regression networks, and (b) identification of the road condition with a pattern recognition classifier allowing to select the correct estimation output among the three regression network outputs. The regression ...
Tópico(s): Transport Systems and Technology
2019 - Taylor & Francis | Vehicle System Dynamics
Renato Galluzzi, Salvatore Circosta, Nicola Amati, Andrea Tonoli, Angelo Bonfitto, Torbjörn A. Lembke, Milan Kertész,
Abstract The Hyperloop transportation system paradigm has gained increasing attention in the last years due to its potential advantages in technology, territory, and infrastructure. From an engineering point of view, it would lead to fast, safe, efficient transportation of passengers and cargo. The stability of the electrodynamic levitation system represents a key enabling aspect of Hyperloop. In this context, the state of the art presents numerous attempts to stabilize these systems without definitive ...
Tópico(s): Brake Systems and Friction Analysis
2020 - American Society of Mechanical Engineers | Journal of vibration and acoustics
Jamshid Mavlonov, Sanjarbek Ruzimov, Andrea Tonoli, Nicola Amati, Akmal Mukhitdinov,
In the last decade, a number of research works in electrified vehicles have been devoted to the analysis of the electric consumption of battery electric vehicles and the evaluation of the main influencing factors. The literature analysis reveals that the electric motor size, efficiency, and driving condition substantially affect the electric energy stored in the vehicle battery. This paper studies the degree of sensitivity of energy consumption to electric motor size and to its efficiency map characteristics. ...
Tópico(s): Electric and Hybrid Vehicle Technologies
2023 - Multidisciplinary Digital Publishing Institute | World Electric Vehicle Journal
Dinesh Cyril Selvaraj, Shailesh Hegde, Nicola Amati, Francesco Paolo Deflorio, Carla Fabiana Chiasserini,
Sensing, computing, and communication advancements allow vehicles to generate and collect massive amounts of data on their state and surroundings. Such richness of information fosters data-driven decision-making model development that considers the vehicle’s environmental context. We propose a data-centric application of Adaptive Cruise Control employing Deep Reinforcement Learning (DRL). Our DRL approach considers multiple objectives, including safety, passengers’ comfort, and efficient road capacity ...
Tópico(s): Traffic Prediction and Management Techniques
2023 - Multidisciplinary Digital Publishing Institute | Applied Sciences