减速带路面工况下线性和非线性模型悬架的最优阻尼比

为研究减速带路面工况下悬架最优阻尼比，搭建了二自由度汽车悬架线性及非线性模型，并采用Matlab/Simulink软件建立正弦截面减速带路面时域模型以通过仿真验证路面模型准确性。在此基础上，根据ISO标准中频率加权系数设计频率加权滤波网格；探讨脉冲输入下悬架线性模型的局限性，提出考虑车轮离地、撞击限位块场景下的二自由度悬架非线性模型；最后采用振动剂量值VDV和轮荷冲击系数k作为减速带路面工况下平顺性评价指标，仿真比较线性和非线性模型在考虑车轮离地、不同悬架限位块刚度以及不同行驶速度情况下的悬架最优阻尼比。研究表明仅考虑车轮离地非线性情况不会影响最优阻尼比，考虑撞击限位块时，不同限位块刚度以及不同车速均影响最优阻尼比. 该项研究结果为车辆悬架阻尼优化及控制提供了依据。

Optimal Suspension Damping Ratio Study Using Linear and Non-linear Suspension Models under Speed Bump Road Conditions

In order to study the optimal suspension damping ratio under speed bump road conditions, two-degree-of-freedom (DOF) vehicle suspension linear and non-linear models are established and a time domain model of the speed bump road with a sinusoidal cross section is built using Matlab/Simulink. The accuracy of the road model is verified through simulation. A frequency weighting filter is designed per ISO specification to effectively study the ride comfort under different frequency ranges. The limitations of the suspension linear model under impulse inputs is discussed and a non-linear suspension model considering wheel off the ground and limit blocks impact use cases is proposed. Finally, the Vibration Dose Value (VDV) and wheel load impact coefficient (k) are used as ride comfort evaluation metrics under speed bump road conditions to compare the optimal suspension damping ratios of the linear and non-linear models considering different suspension limit blocks and different driving speeds by simulation. Analysis results indicate that the wheel off the ground nonlinear use case does not affect the optimal suspension damping ratio whole both limit block stiffness and driving speed have impact on the optimal damping ratio. The result of this paper can be utilized for future research in vehicle suspension damping optimization and control.