The dynamic analysis-effect of orifice- of roll-coupled compacted hydro-pneumatic suspension subjected to typical based excitation

Adding flow channel between main and annular chambers in same strut of roll-coupled Hydro-pneumatic Inter-connected Suspension (HIS) can effectively avoid the negative hydraulic pressure caused by the high damping factor of connected pipes under high velocity condition. This flow channel is usually closed in previous research in HIS area. In this study, the effect of orifice between main and annular chambers in same strut to the dynamic properties of HIS under the different road excitations is investigated by the established AMEsim half-car simulation model. The bounce and roll displacement/acceleration of the sprung mass are used to evaluate the dynamic properties of HIS. The results illustrate that (1) the added orifice can reduce the roll displacement/acceleration with slight influence on the vertical displacement/acceleration under the transient and road loop excitations; (2) the added orifice will not change the resonance frequency of the bounce and roll modes; (3) comparing with the traditional HIS design (without the added orifices), the maximum roll transmissibility can decrease 30.17% with 2.89% increase of the maximum vertical transmission for the added orifice with 2 mm 2 area. Overall, the results suggest that the proper size of the orifices will significantly increase the roll-stability properties with slight effect on the bounce mode under the road excitations.