THE INFLUENCE OF THE EXCITATION SIGNAL ON MAGNETORHEOLOGICAL DAMPER DYNAMIC BEHAVIOUR

Alexandru DOBRE

Abstract


In the context of improving the comfort and dynamics of the vehicle, the suspension system has been continuously developed and improved, especially using magnetorheological (MR) shock absorbers. The magnetorheological shock absorber can combine the comfort with the dynamic driving, because it allows the damping characteristic to be adapted to the road profile. The main objective of the paper is to analyse the influence of the excitation signal on the dynamic behaviour of the magnetorheological shock absorber in the semi-active suspension. The influence of the electric current intensity on the damping coefficient and the dissipated power will also be studied. The coefficient being the control variable for the semi-active suspension. In this sense, the author carried out a set of experimental measurements with a damping test bench, specially built and equipped with modern equipment. The results obtained from the experimental determinations show a significantly improved comfort when using a magnetorheological shock absorber, compared to a classic one, by the fact that the
magnetorheological shock absorber allows to modify the damping coefficient according to the road conditions, thus maintaining the permanent contact between the tire and the road due to increased damping force.


Keywords


damper; magnetorheological; excitation; experimental vehicle

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