SimMechanics在转向架测试台运动仿真中的应用

振动试验台在各种车辆以及机械装备的道路模拟实验以及环境试验中发挥着越来越重要的作用.文中研究的六自由度转向架测试台是多自由度振动试验台的一种.研制转向架测试台的过程中,在计算机上基于系统的控制策略对测试台进行运动模拟仿真,可以缩短研制时间和降低研制成本.以一种七作动器六自由度转向架测试台为例,通过SimMechanics模块构建与实际测试台一致的模型,在Simulink环境中建立相应的控制模块,对振动试验台进行运动模拟仿真.通过对该问题的研究,扩展了当前SimMechanics模块在解决复杂机械系统问题中的应用.     

Dynamic simulations of the freight three-piece bogie motion in curve

A loaded freight vehicle with two three-piece bogies is modelled using the accessible mathematical software MATLAB. The results are compared with its corresponding ADAMS/Rail dynamic multibody simulation model, where similar derailment factors are encountered for the freight vehicle. Both models reveal that the possibility of derailment increases immediately after entering and at the end of the curve – signifying the beginning and the end of the curve as two major points for derailment. Although a three-piece bogie construction is rather simple, its mathematical model proves to be very complex and is nonlinear due to the reported frictional contact at the rail/wheel interface as well as the friction wedges. This research is stimulated by bogie derailments that have occurred in the Iranian railways as well as those in the rest of the world.     

双离合器式自动变速器换档过程的仿真研究

通过分析双离合器式自动变速器换档过程的工作原理,在Matlab/Simulink/Stateflow中构建了换档规律模型,作用在基于Matlab/Sinulink/SimMechanics建立的双离合器物理动力学模型上进行仿真和分析,为DCT的产业化开发提供理论基础。