基于虚拟样机技术的某车辆性能仿真研究

Virtual Prototype Technology with Adams ATV

在ATV提供的模型库的基础上,建立了某车辆的多体系统动力学模型,在体现履带车辆的动力性与机动性的特种路面上,对它的行走姿态进行了仿真。该模型有两条履带系统,每条履带系统由诱导轮、负重轮、主动轮、托带轮和108块履带板组成,整个模型共有1674个自由度。按照总体给定的条件,对四种典型情况进行了动力学仿真:(1)爬越32度坡;(2)跨越2.8米宽的壕沟;(3)翻越0.8米高的垂直墙;(4)10度起伏路面的直驶。成功地向模型中施加了车辆的牵引工况,建立了四种典型路面文件,编写了求解大模型虚拟样机的内存动态管理库,解决了车辆在爬坡过程中的“打滑”问题。并仿真计算了悬挂系统、行动系统与表达整车总体性能的力、力矩、速度与加速度等物理量的大小。通过上述仿真分析,为评价车辆的越野性能、动力性能和机动性能以及在设计阶段了解方案设计、总体布置以及动力等对整车性能的影响方面提供了可靠的定量的参考依据。

In this paper,The dynamical multi-body system model, which is the prototype of a certain vehicle, is built on the basis of model provided by ATV program. The driving gesture of the vehicle is simulated on the specific roads which indicate its power and maneuverability. There are 2 track systems in this model and each track system consists of idler, road wheels, sprocket, support rolls and 108 segments. The whole model has 1674 degrees of freedom. According to the conditions provided by general layout designer,the dynamics of following four typical instances are simulated: (1) making the vehicle climb a ramp with slope of 32 degrees, (2) making the vehicle get over a ditch with span of 2.8 meters wide,(3)making the vehicle cross a obstacle wall with 0.8 meters high,(4) making the vehicle drive on a road with slope of 10 degrees. The hydraulic towing torque is exerted successfully on the two sprockets, four typical road file in the model are built, the dynamical library file which manages memory to solve large model is built and the “sliding” problem in climbing ramp with a slope of 32 degrees is solved. Meanwhile, the force,torque,speed and acceleration of suspension, driving and the whole vehicle system are simulated in detail. Through the above mentioned simulation analysis, some reliable quantity references are offered for the prediction of its performances of power etc. and the understanding of effects caused by the general configure design, layout design and power on the whole vehicle’s performances.