重型车驾驶室结构特性仿真分析与研究

针对某重型车驾驶室结构特性分析与优化的问题进行研究,采用CATIA软件对驾驶室进行几何建模,利用HYPERMESH软件建立有限元模型,并进行自由模态仿真分析;利用试验模态和计算模态分析对比的方法,验证了有限元模型的有效性;结合此款驾驶室的承载特点,利用MSC.Patran/Nastran对驾驶室的弯曲和扭转工况进行刚度和强度仿真计算,利用Fatigue对扭转工况下驾驶室的疲劳强度进行仿真计算,给出了驾驶室的易疲劳破坏位置。研究结果表明:驾驶室固有频率为37.826Hz,避开了激振频率,避免了共振现象;在扭转、弯曲两种工况下,驾驶室产生的最大应力分别为108MPa、38.8MPa,均小于材料许用应力,弯曲、扭转刚度满足要求,驾驶室抵抗变形的能力较好,结构设计合理。

Analysis and research on structural characteristics simulation of a heavy vehicle cab

Aiming at the optimization of the cab structure of a heavy vehicle cab,the present research is carried out.Firstly,the geometric model of the cab is made by CATIA software,the finite element model is set up by HYPERMESH software,and the free modal simulation analysis is carried out.Secondly,the validity of the finite element model is verified by comparing and analyzing experimental modal with computational modal.Finally,by considering the load-bearing characteristics of the cab,the stiffness and strength of the cab under bending and torsion conditions are simulated by MSC Patran/Nastran,and the fatigue strength of the cab under torsion conditions is simulated.The fatigue damage location of the cab is proposed,and the direction of improvement of cab structure is pointed out.Research results show that the inherent frequency of the cab avoids the excitation frequency,so the resonance phenomenon can be avoided.Under twisting and bending conditions,the maximum stress produced by the cab is less than the allowable stress of the material,the bending and torsion stiffness meet the requirements,so the cab has a good ability to resist deformation and the structure design reasonably.