关键词: 拖拉机, 液压减振器, 节流孔截面积比, 联合仿真, AMEsim, 组合优化

Abstract: The object is the ratio of the crosssectional area of the throttle hole between the recovery valve and the compression valve, which is aimed to research the hydraulic shock absorber of a tractor suspension system. The purpose of the paper is to analyze the influence of the ratio of the crosssectional area on the vehicle vibration reduction performance. The Recurdyn dynamics simulation model and AMEsim model of hydraulic shock absorber were established,  and the two models are cosimulated,  which have 162 degrees of freedom. Under high and low speed conditions,  and equivalent damping coefficients,  the influence of three schemes (the ratio of the crosssectional area greater or less than 1) would be compared and analyzed. The results indicate that the ratio of the crosssectional area of throttle orifice of hydraulic shock absorber should be less than 1 for agricultural vehicles operating at low speed. The crosssectional area ratio of throttle orifices should be greater than 1,  under the condition of medium and high speed to get better comfort. The design principle would be applied to the selection of the crosssectional area ratio of the throttle hole of the hydraulic shock absorber of tractors and other vehicles.

Key words: tractor, hydraulic shock absorber, crosssectional area ratio of throttle orifice, cosimulation, AMEsim, combinatorial optimization