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• W620317518 abstract "The work presented in this thesis is devoted to the study of mechanism of tyre forcegeneration and its influence on handling dynamics of ground vehicles. The main partof the work involves the development of tyre models for use under steady-state andtransient operating conditions. The general capability of these models is assessedin afull vehicle simulation environment. The interaction between tyre and vehicledynamics is critically evaluated and the observed vehicle behaviour is related to theinherent characteristics of different tyre models.In the field of steady-state tyre modelling, two versions of a numerical tyre model aredeveloped. The modelling procedure is carried out in accordance with the viscoelasticproperties of rubber, which influence the mechanical properties of the tyre structureand play a significant role in the determination of friction in the tyre contact patch.Whilst the initial simple version of the tyre model assumes a parabolic pressuredistribution along the contact, a later more elaborate model employs a numericalmethod for the calculation of the actual normal pressure distribution. The changes inthe pressure distribution as a result of variations in the rolling velocity and normalload influence mainly the levels of self-aligning moment, whilst the forcecharacteristics remain practically unaffected. The adoption of a velocity dependentfriction law explains the force generating behaviour of tyres at high sliding velocities.The analysis is extended to the area of transient tyre behaviour with the developmentof a tyre model appropriate for the study of transient friction force generation withinthe contact patch. The model incorporates viscoelasticity and inertial contributions,and incorporates a numerical stick-slip law. These characteristics are combinedtogether for the successful simulation of transient friction force generation. Themethodologies developed for the modelling of transient friction and steady-state tyreforce generation are combined and further extended in order to create a generictransient tyre model. This final model incorporates a discretised flexible viscoelasticbelt with inertia and a separate fully-dynamic discretised tread, also with inertia anddamping, for the simulation of actual prevailing conditions in the contact patch. Thegeneric tyre model appears to be capable of performing under a variety of operatingconditions, including periodic excitations and transient inputs which extend to thenon-linear range of tyre behaviour.For the evaluation of the influence of the aforementioned tyre models on the handlingresponses of a vehicle, a comprehensive vehicle model is developed, appropriate foruse in handling simulations. The two versions of the steady-state models and thegeneric transient model are interfaced with the vehicle model, and the response of thevehicle to a step-steer manoeuvre is compared with that obtained using the MagicFormula tyre model. The comparison between the responses is facilitated by thedefinition of a new measure, defined as the non-dimensional yaw impulse. It is foundthat the transience involved in tyre behaviour may largely affect the response of avehicle to a prescribed input." @default.
• W620317518 created "2016-06-24" @default.
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• W620317518 date "2005-01-01" @default.
• W620317518 modified "2023-09-26" @default.
• W620317518 title "Tyre models for vehicle handling analysis under steady-state and transient manoeuvres" @default.
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