In this paper, a digital twin to predict failure in automotive steel wheels during experimental fatigue tests is proposed. The methodology involves wheel finite element model that incorporates assembling and mounting processes, CDTire/3D simulation package, employed calculate tyre rim generalised internal forces several loading conditions. two models are decoupled under small deformation assumption, which allows reduce computational effort for batch simulations. Digital Twin (DT) designed...

In this paper, a model order reduction strategy is adopted for the static and dynamic behaviour simulation of high-speed tracked vehicle. The total number degree freedom structure condensed through selection interface degrees significant global mode shapes, an approximated description vehicle behaviour. methodology implemented in customised open-source software to reduce computational efforts. modelled includes sprung mass, unsprung masses, connected by means torsional bars, all track...

Rollover detection and prevention are among the most critical aspects affecting stability safety assessment of heavy vehicles, especially for off-road driving applications. This topic has been studied in past analyzed depth terms vehicle modelling control algorithms design able to prevent rollover risk. However, it still represents a serious problem automotive carmakers due huge counts main causes traffic accidents. The risk also becomes more challenging predict which incipient might be...

This paper aims at investigating powertrain behaviour, especially in transient dynamic responses, using a nonlinear truck vehicle model with parallel hybrid configuration. A power split control was designed to achieve the desired drivability performance, focus on NOx emissions. The controller characterized by high-level model-based logic used elaborate total torque required, and low-level allocation strategy for splitting between engine electric motor. final task enhance based driver...

In vehicle dynamics, yaw rate control is used to improve the cornering response in steady-state and transient conditions. This can be achieved through an appropriate anti-roll moment distribution between front rear axles of a with controllable suspension actuators. Such action alters load transfer distribution, which turn provokes lateral tire force variation. With respect extensive set papers from literature discussing tracking active control, this study presents: i) A detailed analysis...

Conventional coaxial magnetic gears are structures with permanent magnets, which working principle is equivalent to that of epicyclic gearing. The motion transferred between different axles, without contact in the rotating elements, by modulating field generated magnets on inner and outer rotors machine, exploiting ferromagnetic poles middle rotor. challenge replacing standard mechanical an automotive powertrain has led development a new technology paramount importance for industry could...

This paper proposes a digital twin of automotive steel wheel biaxial test bench for dynamic behaviour and assessment condition purposes. The methodology allows to consider the imposed kinematics occurring in experimental after calibration process called "Overturning Moment procedure" is applied, manage pneumatic tyre-rim interactions using finite element method decoupled models tyre wheel. proposed scheme depicts main loading contributions introduces linearisation improve computational...

This work deals with a pneumatically actuated hand composed of four fingers and an opposable thumb. Mechanisms to convert actuator motion into phalanx rotation were studied make each finger as similar possible the human specimen. Force tactile sensors are disposed along phalanxes allow closed-loop force control, while thumb position is sensorized by potentiometer hence controlled. Each component controlled fuzzy logic. solution allowed existing strong nonlinearities be easily managed. A...

This paper describes a mathematical model and presents the dynamic analysis of series-hybrid tracked tank driven by two electric motors, one devoted to propulsion (PM) other steering (SM). A double differential mechanism is adopted electrically produce speed difference between tracks required for skid steering. In this paper, specific transmission called Electro-Mechanical Transmission (EMT). The EMT supports motor control strategy definition size optimisation. Dynamic simulations applied 55...

This paper deals with improving comfort and handling for a ground vehicle through the coordinated control of different active systems available in passenger cars, e.g., electronic stability control, roll engine torque control. The authors first describe separate systems, each its logic, showing advantages limits, then propose various possible integrations, aiming at exploiting benefits approach. Finally, proposed logics are tested on model: simulation results prove effectiveness approach...

Articulated tracked vehicles have been traditionally studied and appreciated for the extreme maneuverability mobility flexibility in terms of grade side slope capabilities. The articulation joint represents an attractive advantageous solution, if compared to traditional skid steering operation, by avoiding any trust adjustment between outside inside tracks. This paper focuses on analysis control articulated vehicle characterized two units connected through a mechanical multiaxial that is...

The first part of the article describes targets related to design an Active Roll Control (ARC) system, based on hydraulic actuation anti-roll bars automobile. Then basic static and dynamic principles system are commented upon in detail. second presents hardware-in-the-loop test bench implemented evaluate designed system. In end, main experimental results summarized discussed from point view integration ARC with electronic stability program.

The paper investigates the torsional oscillations of an automotive transmission system by means experimental test bench used to validate proposed lumped parameter model. rig consists a Dual Clutch Transmission (DCT) and Manual (MT) connected through respective output shafts, while excitation is provided two electric motors, which are controlled in speed or torque. analysis includes measurement external torques, applied motors mechanical system, response terms angular speeds at different...

The paper deals with the elaboration of an Active Roll Control (ARC) oriented both on comfort and handling improvement. ARC determines hydraulically variation equivalent stiffness anti-roll bars. Thecontrol strategies conceived were extensively validated through road tests managed Alfa Romeo sedan. first part improvement, mainly consisting in absence bar effect during straight-ahead travel a modification roll characteristic car. To increase driver's feeling, it was necessary to optimise...

Firstly, the paper presents Politecnico di Torino Hardware-in-the-Loop (HIL) brake systems test bench. Secondly, it describes in detail all necessary basic tests to characterize, on bench, an ESP hydraulic unit: for example, step response of each valve, measurement pressure limiter valves calibration, motor pump unit. The experimental results are reported. Thirdly, deals with frequency valves, by using Pulse Width Modulation. Pressure gradients and oscillations obtained commented detail. An...

This paper presents the methodology adopted by Politecnico di Torino Vehicle Dynamics Research Team to obtain objective indices for evaluation of comfort during gear change process. Some test drivers and different passengers traveled on a vehicle assigned marks basis their subjective feeling gearshifts. The comparison between most significant evaluations experimental values obtained instruments located is presented. As consequence, some (based physical parameters) evaluate efficiency...

Abstract Traditional electronic stability control (ESC) systems act on one or more wheels the basis of a logic aiming at variables that cannot be directly measured (vehicle sideslip angle and tyre slip). Hence, vehicle state estimator capable evaluating needed from data input sensors is necessary. In present paper, authors discuss different approach to estimation problem, assuming forces acting can measured. The ESC feed-forward designed through frequency response analysis in order obtain...

This paper deals with a powershift automated manual transmission, i.e. an transmission torque gap filler, which essentially integrates, in typical layout, filler assembly the aim of reducing that occurs during gearshifts. The consists additional mechanical link between engine and output shaft, thus enabling power to flow through this parallel path also when launch clutch is disengaged, clear benefits terms both sportiness passenger comfort. first part two-part study which, after general...

This paper explores the potentiality of reducing noise and vibration a vehicle transmission thanks to powertrain control integration with active braking. Due external disturbances, coming from driver, e.g. during tip-in / tip-out maneuvers, or road, crossing speed bump driving on rough torsional backlashes between rotating components (gears, synchronizers, splines, CV joints), may lead NVH issues known as clonk. study initially focuses positive effect performance concurrent application...