Riccardo Russo

• Professor
• Professor at University of Naples Federico II

A procedure of non-destructive experimental tests aimed at determining the viscoelastic characteristics of the rubbers is described. After recalling the basic principles of viscoelastic theory, the experimental setup and the measurements necessary for the test are described. The procedure consists in hitting the surface of the object under test wit...

The paper reports a numerical investigation on the dynamic behaviour of a vehicle driveline, equipped with a Torsional Vibration Damper (TVD) based on Magneto-Rheological Elastomeric (MRE) spring elements, during the start-up transient considering an abrupt manoeuvre of clutch engagement. The TVD device consists of a flywheel and a damper disk, wit...

The paper reports the stages of development of an innovative torsional vibration damper employing magnetorheological elastomers as spring elements. Such device could be adopted for reducing torsional vibrations of a vehicle powertrain.

The paper describes the improvement of an automatic machine that dispenses glue on objects placed on a worktop; in particular, the machine was developed to glue the upper and the rubber inserts on the soles of the shoes. The system is characterized by the presence of a vision system which has the purpose of locating the position of the soles lying...

The paper describes the development of an automatic machineAutomatic machine to be adopted to glue the shoe upper to its soleSoles or to glue a rubber insert on the lower surface of the soleSoles. The machine prototype consists in a cartesian robot that drives a glue gun and by a vision system that can recognize the soleSoles, placed on a worktop,...

This paper presents a novel gluing machine comprising a Cartesian robot and a vision system. The vision system enables the location and reconstruction of the shape of objects to be glued; the detected information is then used to plan the trajectory of the robot whose end-effector is a glue gun and to move the robot with an error suitable to industr...

An innovative device consisting of a flywheel equipped with a torsional vibration damper, based on the magnetorheo-logical effect in elastomeric spring elements, is proposed in this paper. The feasibility study reports the dynamic behaviour of an automotive driveline equipped with the device aiming to explore the effectiveness of the damper in redu...

Nowadays, the automotive field takes care of human safety in the everyday driving. In this sense, the vehicle dynamics control systems and ADAS (Advanced Driver Assistance System) play a crucial role for both active and passive safety. In terms of handling, the critical issues for the everyday driver are during braking or steering maneuvers: the ma...

In this paper an application for the Kinect V2 sensor is described in the robotic field. The sensor is used as a vision device for detecting position, shape and dimensions of an object on the working space of a robot in order to planning the end effector path. The algorithms used for the recognition of contour and spatial position of planar shapes...

The activity described in this paper has been carried out in the framework of a funded project aimed at evaluating the feasibility of a controllable water pump based on an integrated magnetorheological fluid clutch. The advantages consist of an improvement of the overall vehicle performance and efficiency, in the possibility of disengaging the wate...

This paper deals with the experimental investigation about the sliding contact between tire tread and rough surfaces. To build and to validate reliable tire dynamical behaviour models it is fundamental the knowledge of the local grip in each point of the contact patch since in the contact patch points different conditions arise because of contact p...

The results of an experimental activity, carried out using a prototype of pin on disk machine and aimed at investigating the frictional behavior of visco-elastic materials in sliding contact with rigid asperities, are presented. The pin is a rubber specimen coming from three different passenger automotive tires, while the disk is covered with glass...

This paper presents a nonlinear control for a hydraulic seismic isolator test rig with significant nonlinearities. These are the key factors causing delay and error in the hydraulic actuation response and highly limit the performances of the classical linear control. Hence, a nonlinear control design based on the mathematical model of the hydraulic...

A new automotive controllable differential is proposed and tested, firstly in software environment and, successively, following a hardware in the loop procedure based on the employment of the physical prototype. The device is based on the employment of magnetorheological fluid, whose magnetization allows to generate the locking torque and, conseque...

A new controllable limited slip differential is proposed and tested in software environment. It is characterized by the employment of a magnetorheological fluid, which presents the property of changing its rheology thanks to an applied magnetic field. A vehicle model has been designed and employed for the synthesis of a sliding controller. The cont...

Aim of this paper is to describe a research activity on the virtual prototyping, by means of the Reverse Engineering techniques, of an automotive semi-active,differential based on the use of a Magneto-Rheological Fluid. The MRF allows to control the locking torque and consequently to improve the vehicle handling. Starting from the 3D digitizing and...

The paper describes a mechanical slope developed to investigate rainfall-induced shallow landslides in loose coarse-grained soils, which can evolve into high-speed flowslides with propagation capabilities even in areas with very low gradients, putting people’s lives and property at risk. The mechanical slope is the main component of an experimental...

This paper describes a research activity concerning the design and the development of an automotive semi-active differential based on the use of a magnetorheological fluid that allows to control the locking torque and, consequently, to improve the vehicle handling. Starting from a gearbox of a common front wheel drive vehicle, the boundary volume o...

The aim of the paper is the study of the frictional behaviour of a tyre tread elementary volume in sliding contact with road asperities. Friction is supposed as composed by two main components: adhesion and deforming hysteresis. The target, fixed in collaboration with a motorsport racing team and with a tyre manufacturing company, is to provide an...

The paper describes a mechanical slope developed to investigate rainfall-induced shallow landslides in loose coarse-grained soils, which can evolve into high-speed flowslides with propagation capabilities even in areas with very low gradients, putting people's lives and property at risk. The mechanical slope is the main component of an experimental...

In questo lavoro viene presentato un approccio metodologico volto ad applicare la termometria radiativa "bicolore" in termografia quantitativa . L'approccio proposto si basa sulla possibilità di esprimere l'errore percentuale di misura in funzione della emissività monocromatica della superficie bersaglio. Per ogni misura effettuata si individua, in...

This paper deals with the frictional behaviour of a tyre tread elementary volume in sliding contact with road asperities. Friction is supposed as composed by two main components: adhesion and deforming hysteresis. The target, fixed in collaboration with a motorsport racing team and with a tyre manufacturing company, is to provide an estimation of l...

This paper is focused on the modelling, the system identification and the adaptive control design of an unidirectional hydraulically actuated seismic isolator test rig. The plant, constituted by the hydraulic actuation system and the isolator under test, is characterized by a non-linear behaviour and parametric uncertainties caused by the operating...

Knowledge about phenomena concerning with adherence is a key factor in the automotive field and in particular in the braking/traction and stability control systems design. Moreover, the continuous drivers’ seeking of the optimal grip conditions, makes the development of a physical friction model an essential instrument for the investigation of the...

The development of an automotive semi-active differential is described. The device is based on the use of a magnetorheological fluid and allows to control the locking torque and, consequently, to improve the vehicle handling. In order to evaluate the effectiveness of the proposed device, a physical prototype was realized and the first experimental...

According to the most recent approaches, the friction coefficient arising between tyre rubber and road can be seen as constituted by three components: adhesion, deforming hysteresis and wear. This paper deals with the estimation of the hysteretic component of friction. This component is due to indentation phenomena regarding contact mechanics of de...

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 graphic...

A theoretical/experimental activity has been carried out on a magnetorheological fluid brake prototype. A non-linear observer and an optimal control have been designed and tested on the physical device. Both the feedback control and the state observer are based on the state dependent Riccati equation technique. A first order non-linear dynamic mode...

An experimental/theoretical activity concerning the modelling and the adaptive control design of a magnetorheological fluid brake is described. The parametric uncertainty that characterizes the system suggests the employment of an adaptive control finalized to track the reference braking torque. This feedback control method is able to minimize the...

A theoretical/experimental activity has been carried out on a magnetorheological fluid brake prototype. A non-linear observer and an optimal control have been designed and tested on the physical device. Both the feedback control and the state observer are based on the state dependent Riccati equation technique. A first order non-linear dynamic mode...

The study of vehicle handling behaviour is of fundamental importance in order to improve vehicle safety, especially as concerns the loss of stability in the lateral direction resulting from unexpected lateral disturbances like side wind force, tyre pressure loss, µ-split braking due to different road pavements such as icy, wet, and dry pavement, et...

The results of an experimental activity carried out with the aim to investigate on the adhesive behaviour of visco-elastic materials in sliding contact with road asperities are presented. Experiments are carried out using a prototype of pin on disk machine in which pin is constituted by a specimen of rubber coming from a commercial tire, while diff...

Modern vehicles are equipped with several active and passive devices whose function is to increase active safety. This paper is focused on the anti-roll stiffness influence on vehicle handling, and follows a theoretical approach. The work firstly develops a quadricycle theoretical model, useful to study the influence of anti-roll stiffness on the v...

The paper describes an experimental/theoretical activity that involves a magnetorheological fluid brake (MRFB). The variability affecting the plant parameters suggests the employment of a model reference adaptive control finalized to regulate the braking torque. This feedback control method is able to minimize the tracking error in presence of a pl...

In this paper the results of an experimental activity carried out with the aim to investigate on the frictional behaviour of visco-elastic materials in sliding contact with road asperities is presented. Experiments are carried out using a prototype of pin on disk machine whose pin is constituted by a specimen of rubber coming from a commercial tyre...

This paper presents an activity concerning the modelling and control of an unidirectional electro-hydraulically actuated table adopted to test vibration isolators. The test rig consists of a hydraulic actuation system that drives a sliding table mounted on linear bearings. The system is characterized by nonlinearities such as valve dead zone and fr...

This paper investigates the modelling, parameter identification and control of an unidirectional hydraulically actuated seismic isolator test rig. The plant is characterized by non-linearities such as the valve dead zone and frictions. A non-linear model is derived and then employed for parameter identification. The results concerning the model val...

This paper describes experimental/theoretical activities carried out on a magnetorheological fluid brake (MRFB) prototype. A device model is derived and a detailed evaluation of the influence of temperature and speed on its parameters is performed. It can be seen that temperature and speed act as modifying inputs for the system model and change the...

The paper provides an investigation into the influence of the periodic variation in the boundaries of the dead-zone between the teeth, caused by the Transmission Error, on the gear rattle phenomenon.The study represents an evolution of a theoretical model, which has already been developed by the authors, to analyze lightly loaded gear pairs, accoun...

This paper describes theoretical and experimental studies of a shear mode magnetorheological fluid device. A testing procedure is used to measure the fundamental quantities needed to define a state space non-linear model and to identify its parameters. The obtained model is then validated by means of comparisons between modelling results and measur...

In this paper an equipment and a procedure for the determination of large object inertia parameter are described. The procedure is based on the rigid-body complete motion equation. A least-square optimization is used to identify the 10 inertia parameters starting from the experimental data acquired during both, static and dynamic tests. The equipme...

This paper presents a semi-active differential, magneto-rheological fluid limited slip differential, which allows us to bias the torque between the driving wheels. It is based on the magneto-rheological fluid employment, by which it is possible to change, in a controlled manner, the internal friction torque and, consequently, the torque bias ratio....

The article describes an experimental investigation into the “gear rattle” phenomenon in automotive manual transmissions with a special focus on the influence that lubricant oil may have in reducing this undesirable event.The experimental analysis has been conducted in order to validate a theoretical model developed by the authors that accounts for...

This paper is concerned with the analysis of systems with gears. An experimental setup is presented to study the complex behavior exhibited by this class of dynamical systems, focusing in particular on all those phenomena associated to noisy operation. Specifically, using an appropriate model of the experimental rig, the coexistence of several peri...

In this paper a theoretical analysis concerning the influence of the oil damping effects on the dynamic behaviour of manual automotive transmissions, in the “idle” operating condition, is proposed. The study presents an analytical model that accounts both for the hysteretic friction in the clutch springs and for the oil squeeze effect between the i...

In this article, a logic for vehicle dynamics control during partial braking while turning a corner is presented, which only requires knowledge of the instantaneous speed of the four wheels. For this reason, the proposed control algorithm can be adopted on all ABS equipped cars. A scheme of the simulation program for logic validation is described,...

In this paper a non-linear one-degree-of-freedom model for analysis of gear rattle vibrations in automotive manual transmissions is presented. In order to take into account the damping effects owing to the oil in the gap between two teeth of a meshing gear, a simple one-dimensional model for the oil-film squeeze effects is proposed. The squeeze mod...

In this paper an algorithm for the kinematic analysis of a multilink suspension taking joint compliance into account is presented. The analysis can be pro. tably used in an identi. cation procedure to determine elastokinematic parameters starting from experimental data. The proposed identification algorithm is based on the solution of a typical non...

A methodology is presented for identifying car parameters by studying the vehicle's handling. The methodology is based on the Kalman filter and makes it possible to determine the parameters on the basis of the results obtained from standard, on-road handling manoeuvres.

The results of a survey conducted on an experimental system consisting of a rigid rotor supported on two radial bearings each with five tilting pads is presented. In particular, the system was set up in order to assess the dynamic behaviour of the bearing in unusual operating conditions. The response of the bearing to different unbalance values was...

The dynamic behaviour and stability analysis of an unloaded rotoron cylindrical lubricated bearings subjected only to the actionof unbalance is presented. The ``short bearing model'' has beenadopted to evaluate the hydrodynamic fluid film force. As theunbalance increases, the system shows the typical behaviour ofnon-linear mechanical systems as the...

The stability of a rigid rotor supported on radial tilting pad journal bearings is analysed. This study has been tackled both for small unbalance values by linearising the equations of motion, and also in the case where, because of the high unbalance value, the rotor axis describes orbits with an amplitude such that the system's non-linearity canno...

This paper describes a method for conducting non-linear stability analysis on the synchronous motion of the journal axis and tilting pads in a system consisting of a symmetrical rigid rotor mounted on tilting pad journal bearings with two pads. The method makes it possible to obtain the limit curves separating the stable operating condition, charac...

A theoretical investigation is carried out on the orbital motions of a symmetrical, unbalanced, rigid rotor subjected to a constant vertical load and supported on two lubricated journal bearings. In order to determine the fluid film forces, the short bearing theory is adopted. A method is illustrated that makes it possible to determine the analytic...

With reference to a rigid symmetrical unbalanced rotor on lubricated journal bearings and adopting the short bearing theory, synchronous orbits and orbits with a 1/2 component described by the journal are determined as approximated solutions of the system of non-linear motion equations. The method also makes it possible to evaluate the stability of...

The dynamic behaviour of a rigid rotor on tilting-pad journal bearings system is analysed for balanced and unbalanced rotors. The study mainly regards a two-pad journal bearing symmetric with respect to the external static load. Both linear and non-linear behaviours have been analysed, with particular reference to the stability of the journal and p...

The influence of oil-film turbulence on the parametric excitation instability of a symmetrical unbalanced rotor in short bearings is analysed for different values of Reynolds number. The method of calculating the journal orbit is described together with the method for predicting the synchronous orbit whose stability is to be evaluated. In addition...

A theoretical-experimental investigation was carried out on the behavior of a rigid symmetrical balanced rotor in short, cylindrical, circumferentially fed journal bearings under low load conditions. The influence of supply pressure on bearing static characteristics and oil film instability threshold was evaluated for the above system. The experime...

The influence of turbulence and inertia of oil film on the dynamic characteristics and stability of rotor-bearings systems is theoretically analyzed for various Reynolds number values. The rotor is assumed to be rigid, symmetrical, balanced, and supported in two identical aligned journal bearings. The fluid film forces are evaluated under the short...

A mathematical model to determine the stiffness and damping coefficients and the stability limit curves of a journal bearing in a non-laminar lubrication regime is described. The results show the flow regime influence on the dynamic characteristics of cylindrical bearings and on the stability of a rigid rotor on rigid supports.

The paper describes a test rig for the experimental validation of theoretical models to analyze the automotive drive-line dynamic behaviour accounting for the presence of oil between the impacting teeth of the gear pairs. The rig is constituted by a single gear pair, driven by an electric motor controlled in speed by an inverter. The peculiarity of...

Due to the irregularity of the I.C. engine torque, the impacts between the tooth of the unloaded gear pairs of a gear box produce vibrations originating an acoustic phenomenon, known as "gear rattle noise". The paper presents a theoretical study on the dynamic behaviour of automotive transmissions focusing on the presence of oil between the impacti...