Author
Flavio Farroni
Bio: Flavio Farroni is an academic researcher from University of Naples Federico II. The author has contributed to research in topics: Vehicle dynamics & Tread. The author has an hindex of 12, co-authored 46 publications receiving 388 citations.
Topics: Vehicle dynamics, Tread, Contact patch, Viscoelasticity, Yaw
Papers
More filters
TL;DR: In this article, the influence of vehicle physical characteristics on vehicle lateral behavior was investigated in terms of saddle-node bifurcation parameters, such as centre of mass longitudinal position, tyre cornering stiffness and front/rear roll stiffness ratio on vehicle stability.
Abstract: This paper deals with in-curve vehicle lateral behaviour and is aimed to find out which vehicle physical characteristics affect significantly its stability. Two different analytical methods, one numerical (phase plane) and the other graphical (handling diagram) are discussed. The numerical model refers to the complete quadricycle, while the graphical one refers to a bicycle model. Both models take into account lateral load transfers and nonlinear Pacejka tyre–road interactions. The influence of centre of mass longitudinal position, tyre cornering stiffness and front/rear roll stiffness ratio on vehicle stability are analysed. The presented results are in good agreement with theoretical expectations about the above parameters influence, and show how some physical characteristics behave as saddle-node bifurcation parameters.
61 citations
01 Feb 2017
TL;DR: In this article, the effects that tire wear induces in vehicle performance, in particular as concerns the consequences that tread removal has on thermal and frictional tire behavior. But the authors focus on the effects of tire wear on vehicle performance.
Abstract: The tire and vehicle setup definition, able to optimise grip performance and thermal working conditions, can make the real difference as for motorsport racing teams, used to deal with relevant wear and degradation phenomena, as for tire makers, requesting for design solutions aimed to obtain enduring and stable tread characteristics, as finally for the development of safety systems, conceived in order to maximise road friction, both for worn and unworn tires. The activity discussed in the paper deals with the analysis of the effects that tire wear induces in vehicle performance, in particular as concerns the consequences that tread removal has on thermal and frictional tire behaviour. The physical modelling of complex tire–road interaction phenomena and the employment of specific simulation tools developed by the Vehicle Dynamics UniNa research group allow to predict the tire temperature local distribution by means of TRT model and the adhesive and hysteretic components of friction, thanks to GrETA model....
43 citations
TL;DR: A new physical tyre thermal model was developed in collaboration between the Department of Industrial Engineering of the University of Naples Federico II and a top ranking motorsport team and takes into account all the heat flows and the generative terms occurring in a tyre.
Abstract: In the paper a new physical tyre thermal model is presented The model, called Thermo Racing Tyre (TRT) was developed in collaboration between the Department of Industrial Engineering of the University of Naples Federico II and a top ranking motorsport team The model is three-dimensional and takes into account all the heat flows and the generative terms occurring in a tyre The cooling to the track and to external air and the heat flows inside the system are modelled Regarding the generative terms, in addition to the friction energy developed in the contact patch, the strain energy loss is evaluated The model inputs come out from telemetry data, while its thermodynamic parameters come either from literature or from dedicated experimental tests The model gives in output the temperature circumferential distribution in the different tyre layers (surface, bulk, inner liner), as well as all the heat flows These information have been used also in interaction models in order to estimate local grip value
41 citations
TL;DR: TRICK as mentioned in this paper is a tool for the characterization and simulation of real tire interaction with the road, based on the time history of the acquired signals and containing force and slip estimations, useful to provide tire interaction characteristics, which can be integrated with the physical models developed by the Vehicle Dynamics UniNa research group.
38 citations
TL;DR: In this paper, the authors exploited the possibility to use two optical techniques and combining their measurements for the 3D characterization of different racing tyres with particular attention to the tyre's section.
34 citations
Cited by
More filters
TL;DR: The Craft of Scientific writing as discussed by the authors is a well-written book that from actual documents differences between stro entific writing and scientific writing by surface question of how ten to the deeper question are written as they are.
Abstract: well-written book that from actual documents differences between stro entific writing. It also of scientific writing by surface question of how ten to the deeper question are written as they are. make you a critical reader writing to allow you to style for various writing Chapters do not reac The Craft of Scientific cover), 1996 Writing is a uses examples to illustrate the T g and weak scidiscusses the style gsing beyond the things are writof why things This book can of scientific craft your own situations. like an English
335 citations
TL;DR: In this paper, the authors describe the increasing demands in their applications to improve product efficiency, cost-effectiveness and the development of superior specific properties of composite materials/structures.
Abstract: Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties. There are increasing demands in their applications to loa...
143 citations
TL;DR: Wang et al. as mentioned in this paper proposed a method which combines auxiliary particle filter and the iterated extended kalman filter (APF-IEKF), and then processes the results of the first step using iteration algorithm.
96 citations
TL;DR: In this article, the authors provide a comprehensive literature review on the side-slip angle estimation problem, focusing on the most effective and innovative approaches, as well as the advantages and limitations of each technique.
Abstract: Typical active safety systems that control the dynamics of passenger cars rely on the real-time monitoring of the vehicle sideslip angle (VSA), together with other signals such as the wheel angular velocities, steering angle, lateral acceleration, and the rate of rotation about the vertical axis, which is known as the yaw rate. The VSA (also known as the attitude or “drifting” angle) is defined as the angle between the vehicle’s longitudinal axis and the direction of travel, taking the centre of gravity as a reference. It is basically a measure of the misalignment between vehicle orientation and trajectory; therefore, it is a vital piece of information enabling directional stability assessment, such as in transience following emergency manoeuvres, for instance. As explained in the introduction, the VSA is not measured directly for impracticality, and it is estimated on the basis of available measurements such as wheel velocities, linear and angular accelerations, etc. This work is intended to provide a comprehensive literature review on the VSA estimation problem. Two main estimation methods have been categorised, i.e., observer-based and neural network-based, focussing on the most effective and innovative approaches. As the first method normally relies on a vehicle model, a review of the vehicle models has been included. The advantages and limitations of each technique have been highlighted and discussed.
91 citations
TL;DR: The most established non-destructive testing techniques for detection and evaluation of defects/damage evolution in composites are reviewed, which include acoustic emission, ultrasonic testing, infrared thermography, terahertz testing, shearography, digital image correlation, as well as X-ray and neutron imaging.
Abstract: Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties. There are increasing demands in their applications to load-carrying structures in aerospace, wind turbines, transportation, and medical equipment, etc. Thus robust and reliable non-destructive testing (NDT) of composites is essential to reduce safety concerns and maintenance costs. There have been various NDT methods built upon different principles for quality assurance during the whole lifecycle of a composite product. This paper reviews the most established NDT techniques for detection and evaluation of defects/damage evolution in composites. These include acoustic emission, ultrasonic testing, infrared thermography, terahertz testing, shearography, digital image correlation, as well as X-ray and neutron imaging. For each NDT technique, we cover a brief historical background, principles, standard practices, equipment and facilities used for composite research. We also compare and discuss their benefits and limitations, and further summarise their capabilities and applications to composite structures. Each NDT technique has its own potential and rarely achieves a full-scale diagnosis of structural integrity. Future development of NDT techniques for composites will be directed towards intelligent and automated inspection systems with high accuracy and efficient data processing capabilities.
89 citations