基于响应点计算的悬架效率分析

Analysis on the Suspension Efficiency Based on Response Point Calculation

悬架效率指悬架功率与发动机功率的比值。响应点是车辆在不平路面行驶,由于速度过高,发生脱离路面的抛物线运动后,再落到路面瞬间对应的位置。通过受力分析、运动学分析与坡度分析的结合,计算出响应点。由于利用传统受力分析和动能定理计算发动机在单轮上消耗功率的复杂程度高,进而提出功率键合图方法。利用功率键合图理论得到悬架的键合图模型,并据其求得单轮悬架功率和悬架效率的分析公式,提出了利用悬架效率值评定悬架耗能情况的方法。

Suspension efficiency means the ratio between suspension power and engine power. The response point is the position that a vehicle falls back onto the road after the parabolic motion away from the road because of the too high velocity while the vehicle runs on an uneven road,which can be calculated through the combination of force analysis,kinematics analysis and slope analysis. Due to the higher complexity of calculating the single wheel power consumption of the engine by using the traditional force analysis and theorem of kinetic energy,the method of power bond graph is proposed. The bond graph model of suspension is obtained through the utilization of power bond graph theory,and according to it,the analysis formulation of suspension power and efficiency of single wheel is acquired.Then the method of evaluating the suspension power consumption by using the value of suspension efficiency is given.