Analise do comportamento dinamico de um veiculo automotivo

AUTOR(ES)

Nilson Barbieri

DATA DE PUBLICAÇÃO

1989

RESUMO

The theoretical dynamical behaviour of a four wheel car model is analysed. The physical model with seven degrees of freedom is chosen and after some simplifications the corresponding mathematical model is established. First is studied the dynamical eigenbehaviour of the model for both unloaded and loaded conditions through the obtention of the eigenvalues and eigenvestors in different situations: changing the spring stiffness coefficients and the damping coefficient of the dampers (suspensions). Subsequently it is analysed the behaviour of the vehicle with conventional passive suspension moving on a straight road. This road has a deterministic profile of irregularities. This profile is modeled with trigonometric functions, in this case, sinusoid profile. The analysis criteria adopted are: displacement and the aceleration of the gravity center for different speeds of the vehicle. A gas spring suspension system is modeled and fitted to the vehicle. Is this way, it is analysed the behaviour of the vehicle when crossing a ramp with three different suspension types: conventional passive, passive and semi-active with gas spring, in both unloaded and loaded conditions

ASSUNTO(S)

veiculos a motor - dinamica

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