基于动态轴荷的电控制动系统制动力分配控制算法

针对半挂汽车列车制动时轴荷转移大、制动距离受载荷影响大的问题,提出了非紧急制动工况基于动态轴荷的制动力分配算法。根据轴荷变化动态调整制动力分配,使各轴利用附着系数与车辆制动强度一致,同时根据车辆实际制动强度与理想制动强度差值调整制动力,使车辆在相同制动过程中制动距离不受载荷影响。对比通过软件进行常规制动与采用该算法的电控系统车辆在不同载荷下的制动仿真结果表明,该算法可动态分配制动力并进行减速度控制。

基于动态轴荷的电动汽车再生制动策略研究

基于弹簧弹性与位移的非线性关系,建立了具有非线性悬架的7自由度整车模型,提出一种基于悬架变形的车轮动态轴荷计算方法和基于最佳滑移的路面附着系数计算方法,利用车轮动态轴荷和路面附着系数计算前、后车轮制动力。建立了以制动强度、车速和电池荷电状态(SOC)作为输入变量,期望的再生制动力作为输出变量的模糊逻辑控制模型,并在ADVISOR中开展仿真。结果表明,所设计的控制策略在保证制动稳定性的同时提高了再生制动能量的回收效率,验证了该控制策略的可行性。

基于轴荷平衡的双联轴货车钢板平衡悬架参数优化

为全面改善双联轴货车的综合行驶性能，提出一种考虑动态轴荷平衡的货车双联轴钢板平衡悬架参数优化方法。首先，基于数值分析法分别建立带钢板平衡悬架的6自由度1/2车辆模型和单轮辙随机激励时域模型，并在MATLAB/Simulink中构建相应的车路耦合动力学模型。进而提出综合反映动态轴荷平衡和平顺性的多联轴货车综合行驶性能指标，依据正交试验探索悬架各参数对车辆综合行驶性能的影响程度。最后通过极差和方差分析实现悬架关键参数的全面优化。结果表明，在20~90km/h车速下，相对于原货车，参数优化后货车的综合行驶性能指标约提高了30%。

Crashworthiness of double-cell conical tubes with different cross sections subjected to dynamic axial and oblique loads

Thin-walled tubes are increasingly used in automobile industries to improve structural safety.The present work deals with the collapse behavior of double-cell conical tubes subjected to dynamic axial and oblique loads.Crashworthiness of these tubes having different sections(e.g.,circular,square,hexagonal,octagonal,decagonal)was numerically investigated by using an experimentally validated finite element model generated in LS-DYNA.Geometry of these tubes was then optimized by decreasing the cross section dimensions at the distal end while the weight remained unchanged.Octagonal conical tube was finally found to be more preferable to the others as a collision energy absorber.In addition,square and circular tubes showed diamond deformation mode,while the other tubes collapsed in concertina mode.A decision making method called TOPSIS was finally implemented on the numerical results to select the most efficient energy absorber.