Curve Passing Performance and Suspension Parameter Optimization of an Engineering Vehicle Based on Superelevation Slope
The linear slope type has less cost and land occupation,so that it is widely used.But it exacerbates the track irregularity and affects the curve passing performance of vehicle.Therefore,tak-ing an engineering vehicle as an example,the curve passing performance and the variation of wheel-rail vertical force in linear,sine and cosine type were analyzed.The relationship between the vertical force of spring and superelevation slope ratio was deduced.In addition,the contribution degree of each sus-pension parameter to the curve passing performance of the engineering vehicle under different superele-vation type was analyzed based on the optimal Latin Hypercube design,and some suspension parameters were selected for multi-objective optimization.The results show that among three superelevation types,the wheel load reduction rate in linear type is the smallest when the speed is lower than 50 km/h,and the largest when the speed is higher than 50 km/h.The wheel-rail vertical force in linear type fluctuates obviously,and the wheel-rail vertical force in sine type and cosine type is parabolic.There is an approxi-mate linear relationship between the variation of vertical force of spring and the superelevation slope ra-tio.After optimization,the derailment coefficient of engineering vehicle remains basically unchanged,and the wheel load reduction rate is optimized by 28%～36%,which is far less than the second limit.Compared with sine and cosine type,the wheel load reduction rate in linear type is greatly affected by the vertical stiffness of the secondary spring,and the vertical stiffness needs to be reduced to 5.08 MN/m.
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