路面附着条件对车辆横向稳定性影响的量化分析

摘要

The vehicle dynamics model and road model were set up by using software TruckSim ,then the rollver stability index (LTR) and sideslip stability index (EG) were introduced to study the influ-ence of road condition on vehicle control stability .The resluts indicate that the road adhesion coeffi-cient are negatively correlated with vehcile rollver stability ,but positively correlated with vehicle side-slip stability .When the road friction coefficient is 0 .75 in fishhook simulation ,the vehicle has been o-verturned .When the road friction coefficient is below 0 .7 ,no matter w hat speed the vehicle has not overturned .In double line change simulation ,the EG is proportional to the road friction coefficient , and the vehicle may easy out of cotrol when the road friction coefficient is below 0.4 .%采用侧翻稳定性指标LTR值和侧滑稳定性指标EG值，定量分析路面附着系数对车辆横向稳定性的影响．同时，通过多组不同路面附着条件下的车辆动力学仿真实验，找出车辆发生侧滑、侧翻事故时路面附着系数的取值范围．结果表明：在车辆结构参数、车速和转向输入等条件恒定的情况下，路面附着系数与车辆侧翻稳定性呈负相关，与车辆侧滑稳定性呈正相关．在鱼钩仿真工况下，当路面附着系数增大至0．75时，车辆发生侧翻的可能性急剧增大；当附着系数在0．7以下时，车辆发生侧翻的可能性急剧降低；在双移线仿真工况下，当路面附着系数小于0．4时，车辆易失控而发生侧滑现象，但基本不会发生侧翻现象．