【摘要】 本文提出了一种用于多轴车辆测功试验台进行复杂路面模拟时,确定车辆各驱动轴所需施加行驶阻力的方法。本方法通过建立多轴车辆行驶的动力学模型,对车辆行驶中的相关状态量进行计算,进而获得测功机在模拟车辆行驶时所需施加的载荷。与一般方法相比,本方法能够更好地反映具有小坡度、短保持距离、坡度频繁变化等特点的复杂路面对车辆行驶状态的影响,从而使施加载荷更接近于车辆真实的行驶情况。同时通过统计方法将振动台架中使用的路面高程谱进行转换,生成用于本方法使用的测功台架复杂路面地形谱。最后对提出的车辆模型进行了仿真,对比分析了多轴车辆在水平路面和复杂路面上等速、加速、滑行和制动等行驶情况下车辆各个状态量的变化情况,仿真结果初步验证了方法的可行性。更多还原

【Abstract】 A method to determine the driving resistances to be loaded on driving axles of a multi-axle vehicle in complex road simulation on dynamometer test bench is proposed in this paper. By setting up a driving dynamics model for multi-axle vehicle,the method calculates the related state variables of driving vehicle and then determines the load to be applied during vehicle driving simulation on dynamometer. Compared with conventional methods,the method proposed can better reflect the effects of complex road with small,short distance and frequently changed slope on driving state of vehicle,and hence the loads applied are closer to the real driving situation of vehicle. In addition,by means of statistical method,the road elevation spectra adopted in vibration test bench are transformed into complex terrain spectra to be used in dynamometer test bench. Finally a simulation is performed on vehicle model to analyze the variations of state variables of multi-axle vehicle in different driving conditions of cruise,acceleration,coasting and braking on both level and complex roads. The results of simulation preliminarily verify the feasibility of the method proposed.更多还原