Estudo dos efeitos de atrito seco e restituição cubica no comportamento do rotor laval vertical

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

In this work a nonlinear analysis of a simple Laval rotor with a non ideal power source crossing its resonance under a Coulomb dry friction action and cubic restoring force is done. Dynamical changes on the system response are observed through numerical integration in the case of strong nonlinearity and through average method in the case of weak nonlinearity. Some important constitutive request appear from the studies of the behavior. Two important aspects take place: the minimal torque requested for the passage across the critical speed and the amplitude of vibration, both of them are quite dependent on the interaction between the system and the power source. The Coulomb dry friction come from the contact between the rotor and a auxiliar device for reduction of oscillation during the passage through the critical speed. This device is made of cylindric rolles that also leads to a cubic restoring force. Otherwise, without such device the rotor runs free of any kind of dry friction and in this case the shaft is made of material that responds better with the cubic low instead of linear one

ASSUNTO(S)

rotores - dinamica mecanica não-linear

ACESSO AO ARTIGO

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