基于虚拟迭代及有限元理论的某中型货车驾驶室疲劳寿命研究

Fatigue Analysis of a Medium Truck Cab Based on Virtual Iteration and Finite Element Theory

以某中型货车的驾驶室为研究对象,通过整车典型强化路面试验测量得到驾驶室悬置位置及车架上相应位置的加速度响应信号,并基于K&C试验台和MTS试验台分别测量得到驾驶室质心、转动惯量和衬套刚度阻尼等参数。采用ADAMS建立驾驶室和车架的刚柔耦合多体动力学模型;采用Femfat.lab软件使用虚拟迭代的方法计算驾驶室悬置处和翻转机构处的载荷谱;最后运用Miner线性疲劳累积损伤理论在疲劳仿真软件n Code中进行疲劳分析。通过台架试验验证了疲劳仿真的结果,并通过结构尺寸参数的重新设计使驾驶室前围板的疲劳寿命满足了设计要求。

Taking the cab of a medium truck as the research object,the acceleration response signals of the cab mounting positions and the corresponding positions on the frame were obtained through the typical reinforced road tests. The center of mass,moment of inertia of the cab and stiffness and damping of the bushing were measured based on the KC test bench and the MTS test rig. The rigid-flexible coupling multi-body dynamics model of the cab and frame was established in ADAMS software. The load spectrums of the cab suspension and flipping mechanisms were calculated by the method of virtual iteration in Femfat.lab software. Finally,fatigue analysis was carried out in the fatigue simulation software n Code with the Miner linear-cumulation fatigue damage theory. The results of fatigue simulation were validated by bench tests and the fatigue life of cab front panel was satisfied by redesign of the structural parameters.