Suspension rubber bush model in consideration of amplitude dependence, identified by general design parameters

Paper #:
  • 2018-01-0693

Published:
  • 2018-04-03
Abstract:
To improve ride comfort on smooth paved road, hysteresis figure on suspension wheel stroke - force curve has to be designed to avoid an increase of dynamic stiffness due to friction at very small suspension stroke. Rubber bush is one of the important components that cause hysteresis. However, there is no appropriate method to design rubber bush dynamic properties in early phase of vehicle development. In this study, it was confirmed that frequency dependence of dynamic properties of rubber bush was enough small for design process of ride comfort, especially lower than about 30Hz, and its hysteresis on displacement – force curve was like spring – friction elements. In addition, amplitude dependence of loss factor was also small. On these premises, the theory of dynamic analysis and the kinematic study of hysteresis figure showed that only two general design parameters, ‘loss factor’ and ‘dynamic spring constant’ of the base amplitude, could make dynamic spring constant of any amplitude. And hysteresis figure itself for simulation model in consideration of amplitude dependence could be also calculated.
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