Process and device for determining the characteristics of a...

G - Physics – 01 – M

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G01M 17/04 (2006.01)

Patent

CA 2191970

A process is proposed for determining the characteristics of a motor vehicle's built-in shock absorbers. The vehicle is driven onto a ramp support which is then quickly removed, causing the vehicle to drop onto a base whose distance below the ramp support corresponds to the residual rebound clearance associated with the particular vehicle design; the changes in the so-called wheel contact force when the car hits the base are measured. The process is characterized by the fact that the vibration characteristics of the body and one wheel at a time ate measured, the measurement results, together with the measured values of wheel contact force, are fed into the known differential equations governing damped oscillations, and the characteristic data for the vehicle structure, namely, the body- and heel masses, spring stiffness and damping constants, are calculated.

Procédé pour la détermination des caractéristiques amortisseurs montés sur un véhicule, selon lequel le véhicule est amené sur un support de rampe qui est ensuite retiré rapidement, de telle façon que ledit véhicule tombe sur un appui dont la distance par rapport au support de rampe correspond au débattement résiduel de la roue, prédéterminé par la conception du véhicule, et l'on détermine la force dite force de contact de la roue lorsque le véhicule heurte l'appui. Ledit procédé est caractérisé en ce qu'on mesure les caractéristiques de vibration de la carrosserie et de chacune des roues, en ce qu'on introduit les résultats ainsi obtenus de la mesure, conjointement avec les valeurs mesurées pour la force de contact de la roue, dans les équations différentielles connues pour les vibrations amorties, et en ce qu'on calcule les données caractéristiques pour le châssis d'un véhicule, à savoir, les masses de la carrosserie et des roues, la rigidité des ressorts et les constantes d'amortissement.

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