汽车半主动悬架对整车耐久性的影响

Effect of Semi-Active Suspension on Vehicle's Durability

摘要:

随着智能网联汽车的发展，半主动悬架系统的应用范围也更加广泛，因此有必要针对半主动悬架系统对车辆耐久性的影响进行深入研究。首先基于实际天棚阻尼控制模型建立了半主动悬架振动模型，并将其运用到车辆悬架七自由度模型中；其次确定了基于该七自由度模型的悬架性能评价指标，标定出了最优天棚阻尼控制系数；然后以悬架输出的四通道垂向力作为激励，基于一典型轿车的有限元模型，使用惯性释放法进行了静应力分析；之后使用准静态叠加法，对其疲劳损伤进行了分析，确定了该车身的疲劳损伤关键位置，对比了使用半主动悬架和被动悬架时疲劳损伤值，结果发现前者的疲劳寿命得到了较大的优化。

关键词:车辆耐久性;半主动悬架;天棚阻尼控制

Abstract:

With the implementation of intelligent and connected vehicle， the application of semi-active suspension has become more extensive. In this paper， the effect of semi-active suspension on vehicle durability is studied. Firstly， a semi-active suspension vibration model is established based on the actual skyhook damping control model， and it is applied to a vehicle-suspension seven degrees of freedom（7DOF） model. Next， the suspension performance evaluation index is determined based on this 7DOF model， and the optimal skyhook damping control coefficient was calibrated. Then， the fatigue damage analysis was carried out based on a typical sedan finite element model using the inertia release method followed by the quasi-static superposition method， with the four-channel vertical force output from the suspension model as stimulation. The fatigue damage key locations of the vehicle body were determined， and the fatigue damage values were compared when using a semi-active suspension and a passive suspension， and it was found that the fatigue life of the former was optimized to a greater extent.

Key words:vehicle durability;semi-active suspension;skyhook damping control