86,805 research outputs found
On how to Transform a Commercial Electric Quadricycle into a full Autonomously Actuated Vehicle
No full textPreliminary design of an alternative energy storage system for a city car based on flywheel
No full textVehicle energy storage systems have a crucial impact on the spreading of hybrid and electric vehicles.Nowadays the most adopted solution is represented by batteries which suffer of ageing that reduces the battery capacity; moreover, the battery recycling at the end of its life is still a challenge and generate pollution. This paper presents a preliminary design of a kinetic energy storage system for city micro-car. The energy is stored by means of flywheel. First, an energetic model of the car powertrain including flywheel and bearings is proposed and used to evaluate the car energy requirement to accomplish its typical journey. Then, material, geometry and motor have been selected to fit all the vehicle space requirements. Then, analysis on the gyroscopic effects induced by the flywheel is shown when it is subjected to car chassis acceleration. Finally, preliminary considerations on bearing layout are drawn by comparing different bearings types
Optimal powertrain design and control of an electric race car
No full textPowertrain design undoubtedly plays an important role to improve the overall performance of the unprecedented rapidly developing Electric Vehicles (EVs) in recent years. Generally, parameters of the motor and transmission are the primary considerations to meet the performance requirements in electric vehicle design. However, the conventional powertrain design approach in most of the existing work limits the further improvements of the desired performances. In this work, the powertrain design and control problem of a 4-Independent-Wheel-Driving (4-IWD) electric race car with minimum lap time on a given circuit as evaluation criteria is investigated, based on a 7-DOF vehicle model. In particular, the investigated problem is formulated as an optimal control problem and solved with a software package GDYNOPT, taking into account the nonlinear load transfer and the powertrain mass variation that depends on the design parameters. At last, both the optimal design and control parameters are obtained at the same time
Electric powertrain layouts analysis for controlling vehicle lateral dynamics with torque vectoring
No full textThe electrification of vehicle offers the possibility of developing several powertrain layouts due to the use of more than one electric motor. If more than one motor is used to drive a single axle of the vehicle, it is extremely simple to develop torque vectoring based control strategies. In this paper, the effect of torque vectoring applied to different powertrain layouts for HEV is shown and analyzed
Wireless sensor nodes for freight trains condition monitoring based on geo-localized vibration measurements
No full textWhile rail freight transportation is gradually becoming a crucial asset in the context of decarbonization of the transport sector, new standards and requirements in this field aim at improving the safety and reliability of freight vehicles and the infrastructure. From this perspective, Condition Monitoring and Condition Based Maintenance are becoming essential tools to improve systems reliability through the use of in-service instrumented vehicles. On the contrary of high-speed applications, freight trains are actually not provided with any monitoring systems able to carry out this kind of analyses. In this context, an innovative hybrid monitoring system composed by wireless sensor nodes and a gateway was developed to be suitably mounted on a freight wagon. Sensor nodes, power supplied by solar energy, are able to carry out synthetic indices from vibration measurements, while the gateway acquires correlated GPS and odometry information. In order to take advantage of the acquired data, a software based on a geo-localization algorithm created for high-speed applications was developed in order to correlate vibration data to the railway line mileage. A field campaign allowed to test the system on a real freight wagon and to acquire many experimental data. Using the collected experimental data, in the paper is shown how the developed software can be used to perform diagnostic activities of the infrastructure. Moreover, it is demonstrated that relying on the only GPS information is sufficient to get enough accurate georeferenced data for freight trains applications. This paves the way to the future development of a completely wireless system able to perform condition monitoring of both the vehicle and the infrastructure minimizing the impact on the vehicle
Messa a punto di protocolli igienico-sanitari a basso impatto ambientale in aziende di allevamento ittico
No full textA Rotor Resistance MRAS Estimator for EV Induction Motor Traction Drive based on Torque and Reactive Stator Power: simulation and experimental results
No full textA wireless monitoring system to identify wind induced vibrations in HV transmission lines
No full textConductors of High Voltage Transmission Lines are affected by wind induced vibrations that can lead to fatigue failures of fittings and conductors themselves. Monitoring of these phenomena is very important in order to avoid the sudden break of an in-service line and to define the predictive maintenance of the system. Vibration recorders actually employed for field monitoring do not assure a suitable time window to cover all the different wind conditions, they allow to measure only the bending amplitude at the suspension clamp and do not offer any real time alert. For these reasons a new Wireless Monitoring System has been developed specifically for this context, taking advantage of new technologies such as wireless communication and energy harvesting that make possible to obtain compact devices, characterized by long autonomy and on board computations, able to measure the free loop vibration amplitude in the desired points of the instrumented span. In the paper, the hardware composing the wireless system is analysed and a deep insight of the algorithms developed for detection of Aeolian vibrations, Subspan Oscillations and Galloping is carried out. The system has been adopted for the first time in a real monitoring field test in Canada: this campaign has allowed to verify the correct functioning of the devices under extreme weather conditions and to obtain many data. It’s showed how this data have been processed in order to obtain useful information regarding the strains to which conductors are subject because of the wind action. In the end a comparison between experimental and numerical data, obtained by means of a suitable software, is carried out in order to validate the full procedure
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