L. Mangialardi

Polytechnic University of Bari

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Giacomo Mantriota

Polytechnic University of Bari

Giuseppe Carbone

Polytechnic University of Bari

Carlotta Mummolo

Polytechnic University of Bari

Leonardo Soria

University of Bari Aldo Moro

Joo H. Kim

New York University

Giuseppe Carbone

University of Calabria

Angelo Gentile

Polytechnic University of Bari

Leonardo De Novellis

University of Surrey

T. Contursi

Polytechnic University of Bari

Francesco Bottiglione

Polytechnic University of Bari

Cooperative Institutions

Polytechnic University of Bari

Instituto Politécnico Nacional

University of Bari Aldo Moro

University of Basilicata

Center for Biomolecular Nanotechnologies

Innovation Engineering (Italy)

University of Salento

National Research Council

Eindhoven University of Technology

Systems Technology (United States)

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Dynamic behaviour of a closed loop driver?car?caravan system

International Journal of Vehicle Design (2003)

Pierfrancesco Festa L. Mangialardi Giacomo Mantriota

This work studies the influence of the driver on the dynamic behaviour of a car-caravan system. A plane closed-loop 4-DOF linearised model was developed and the feedback was achieved with a compensation tracking model. The analysis of driver-car interaction was studied through the correlation of different ways of driving and effects on the dynamic response. Moreover, this work shows the influence on the stability of car speed and some design parameters such as the position of the caravan's centroid and cornering stiffness of the axle. The effects on the stability induced by different design choices were verified through the simulation of an obstacle avoidance manoeuvre.

Automobile handling

Centroid

Car model

10.1504/ijvd.2003.003354

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Citations (3)

Use of simulation techniques to improve tractor operator safety

L. Mangialardi Simone Pascuzzi Leonardo Soria

In the automotive sector, virtual prototyping allows to reduce time and costs of designing. Crash tests can be simulated by computer models, by using multibody-FEM techniques and, among the solvers available on the market, Madymo (TNO Automotive Safety Solutions - NL) has been developed for being particularly suitable for studying problems of impact and crash mechanics. Born as a general-purpose multibody code, Madymo includes (i) powerful routines of contact detection, (ii) libraries of numerical dummies (which reproduce the dynamical behaviour of the real instrumented dummies, with the aim of evaluating injuries to the occupants) and (iii) the principal active and passive safety systems as different kinds of belts and airbags. We have extended, to our knowledge for the first time, these techniques of numerical simulation to work accidents, analysing the reliability of safety systems aimed at protecting workers and proposing an original approach for their functional design and optimisation. In this paper, the results pertinent to the roll-over of a wheeled tractor with narrow track, placed on a sloping ground, is presented as an application, with the purpose of evaluating the safety performance of a pelvic restraint system.

Tractor

Crashworthiness

Virtual Prototyping

Active safety

Source

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Citations (1)

A comparison of the performances of full and half toroidal traction drives

Mechanism and Machine Theory (2004)

Giuseppe Carbone L. Mangialardi Giacomo Mantriota

Isothermal process

10.1016/j.mechmachtheory.2004.04.003

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Citations (89)

Quantifying Dynamic Characteristics of Human Walking for Comprehensive Gait Cycle

Journal of Biomechanical Engineering (2013)

Carlotta Mummolo L. Mangialardi Joo H. Kim

Normal human walking typically consists of phases during which the body is statically unbalanced while maintaining dynamic stability. Quantifying the dynamic characteristics of human walking can provide better understanding of gait principles. We introduce a novel quantitative index, the dynamic gait measure (DGM), for comprehensive gait cycle. The DGM quantifies the effects of inertia and the static balance instability in terms of zero-moment point and ground projection of center of mass and incorporates the time-varying foot support region (FSR) and the threshold between static and dynamic walking. Also, a framework of determining the DGM from experimental data is introduced, in which the gait cycle segmentation is further refined. A multisegmental foot model is integrated into a biped system to reconstruct the walking motion from experiments, which demonstrates the time-varying FSR for different subphases. The proof-of-concept results of the DGM from a gait experiment are demonstrated. The DGM results are analyzed along with other established features and indices of normal human walking. The DGM provides a measure of static balance instability of biped walking during each (sub)phase as well as the entire gait cycle. The DGM of normal human walking has the potential to provide some scientific insights in understanding biped walking principles, which can also be useful for their engineering and clinical applications.

Zero moment point

Gait cycle

Ground reaction force

Center of gravity

Longitudinal static stability

10.1115/1.4024755

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Citations (65)

Equilibrium states and stability of pre-tensioned adhesive tapes

Beilstein Journal of Nanotechnology (2014)

Carmine Putignano L. Afferrante L. Mangialardi Giuseppe Carbone

In the present paper we propose a generalization of the model developed in Afferrante, L.; Carbone, G.; Demelio, G.; Pugno, N. Tribol. Lett. 2013, 52, 439–447 to take into account the effect of the pre-tension in the tape. A detailed analysis of the peeling process shows the existence of two possible detachment regimes: one being stable and the other being unstable, depending on the initial configuration of the tape. In the stability region, as the peeling process advances, the peeling angle reaches a limiting value, which only depends on the geometry, on the elastic modulus of the tape and on the surface energy of adhesion. Vice versa, in the unstable region, depending on the initial conditions of the system, the tape can evolve towards a state of complete detachment or fail before reaching a state of equilibrium with complete adhesion. We find that the presence of pre-tension in the tape does not modify the stability behavior of the system, but significantly affects the pull-off force which can be sustained by the tape before complete detachment. Moreover, above a critical value of the pre-tension, which depends on the surface energy of adhesion, the tape will tend to spontaneously detach from the substrate. In this case, an external force is necessary to avoid spontaneous detachment and make the tape adhering to the substrate.

Tension (geology)

Limiting

Video tape

10.3762/bjnano.5.182

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Citations (14)

EHL visco-plastic friction model in CVT shifting behaviour

International Journal of Vehicle Design (2003)

Giuseppe Carbone L. Mangialardi Giacomo Mantriota

This paper deals with the shifting dynamics of Van Doorne type metal V-belt CVT transmissions. A one-dimensional continuous model of the belt and a visco-plastic friction model (based on the results of the EHL lubrication theory) are proposed to describe the system behaviour under transient conditions. The model is able to correctly estimate the variator dynamics in "creep mode" (slow shifting manoeuvres) and in "slip mode" (rapid shifting manoeuvres) and to evaluate the borderline between these two operative conditions. The influence on the shifting speed of the ratio between the clamping forces acting on the two axially moving half-pulleys is evaluated together with the effect of the torque load and that of the drive pulley angular velocity. Moreover, a simple relation is obtained which links the shifting speed with the clamping forces ratio, the drive pulley rotating velocity, the torque load and the actual value of the speed ratio.

10.1504/ijvd.2003.003646

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Citations (15)

Computational evaluation of load carriage effects on gait balance stability

Computer Methods in Biomechanics & Biomedical Engineering (2015)

Carlotta Mummolo Sukyung Park L. Mangialardi Joo H. Kim

Evaluating the effects of load carriage on gait balance stability is important in various applications. However, their quantification has not been rigorously addressed in the current literature, partially due to the lack of relevant computational indices. The novel Dynamic Gait Measure (DGM) characterizes gait balance stability by quantifying the relative effects of inertia in terms of zero-moment point, ground projection of center of mass, and time-varying foot support region. In this study, the DGM is formulated in terms of the gait parameters that explicitly reflect the gait strategy of a given walking pattern and is used for computational evaluation of the distinct balance stability of loaded walking. The observed gait adaptations caused by load carriage (decreased single support duration, inertia effects, and step length) result in decreased DGM values (p < 0.0001), which indicate that loaded walking motions are more statically stable compared with the unloaded normal walking. Comparison of the DGM with other common gait stability indices (the maximum Floquet multiplier and the margin of stability) validates the unique characterization capability of the DGM, which is consistently informative of the presence of the added load.

Floquet theory

Ground reaction force

Zero moment point

Moment of inertia

Longitudinal static stability

10.1080/10255842.2015.1110146

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Citations (12)

Theoretical Model of Metal V-Belt Drives During Rapid Ratio Changing

Journal of Mechanical Design (1999)

Giuseppe Carbone L. Mangialardi Giacomo Mantriota

Today the use of metal V-belt (MVB) on C.V.T. (continuously variable transmission) based systems is the rule in automotive applications. The great advantage of this kind of belt is the capability to resist the moving half-pulley’s high axial thrust necessary to transmit the large torque involved. This paper suggest a theoretical model of belt’s behavior during rapid ratio speed changes with the aim to represent the dynamical response of the system during the transient condition. The paper proposes a relation which correlates some easily measurable macroscopic quantities: axial thrust, torque transmitted and belt’s tensions on the slack and tight side. The metal V-belt consists of wedge-shaped plates that are supported by a flexible band, of which there are two types: the metal V-belt without clearance and the metal V-belt with clearance between plates. Our investigation is carried out for the first type of belt and under the hypothesis that there is a rapid variation of speed ratio. The result, that has been reached, allows to predict the behavior of the system and simplifies the planning of continuously variable transmission with metal V-belt.

Belt drive

Continuously variable transmission

Wedge (geometry)

Gear ratio

10.1115/1.1345521

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Citations (32)

Comments on “Maximum mechanical efficiency infinitely variable transmissions”

Mechanism and Machine Theory (1998)

L. Mangialardi Giacomo Mantriota

Continuously variable transmission

10.1016/s0094-114x(97)00037-2