Abstract
This paper investigates the impact of the mass ratio of sprung-unsprung as well as front-rear on tire-road separation (mass ratio) as one of the vital vibration dynamics usually ignored in previous researches. The vehicle vibrating models are used to observe the no-contact phenomenon by introducing nondimensionalization to optimize number of variables and generalize the analysis in discontinuous equations. The examination of vertical displacements and pitch dynamics clarifies the reasonable separation assumption. The quality of different suspension systems in reducing the undesired contactless situations has been compared utilizing separation indicators and time fractions. The acceptable range of mass ratio reduces separation duration or postpones appearance of the contactless phenomenon to suppress potentially undesirable oscillations. Validation has been carried out in the ADAMS environment for different road excitations and mass ratios providing a fair correlation. This research and the proposed models, indeed open new doors and will be used for further suspension optimization.
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