摘要
针对越野车复杂的行驶条件对车架结构苛刻的要求,以越野车车架为研究对象,采用ANSYS软件建立了与某越野车车架结构充分近似的车架三维模型,并根据模态分析理论对其进行了有限元模态分析,获得了该车架的前六阶模态参数.理论值与实验值比较表明,车架能够在一定程度上避免共振现象,模型建立准确,为结构车架的动态设计提供了理论依据.同时对车架进行刚度和静强度分析,由位移、应力云图获得了车架发生应力集中区域.结果表明:第3根横梁和第4根横梁之间的连接处应力值远低于屈服极限,可以考虑梁变细或者钢板缩减壁厚,而在第2,第3根横梁与纵梁相接处应力值大于许用应力值,可以使横梁应加粗或连接处使用加厚焊.实验研究分析为车架的改进和优化提供了参考依据.
For the off-road vehicles driving conditions become complicated and the frame structure demanding,the aim of this work is to regard off-road vehicle frame as the research object,the three-dimensional model of a sport utility vehicle frame structure adequately approximate is established by utilizing ANSYS software.And carrying on the finite element modal analysis based on the modal analysis theory,obtained the first six order modal parameters of the frame.The theoretical value compared with the experimental data show that the frame can avoid the resonance phenomenon in a certain extent.The model is accurate and provides a theoretical basis for the dynamic design of the frame structure.At the same time,obtained the stress concentration area of the frame occurs due to the displacement and stress picture by analyzing the frame stiffness and static strength.The results show that：between the third beam and the forth beam joint stress values much lower yield limit and beam thinning or plate reduced wall thickness should be considered.The stress value is greater than the allowable stress at the area where the second and third cross beam connect with longitudinal beam.The beam should be bold or increasing the thickness of welding at the junction.The experimental research provides a reference for the improvement and optimization of the frame.
出处
《中北大学学报（自然科学版）》
CAS
北大核心
2015年第4期428-434,457,共8页
Journal of North University of China(Natural Science Edition)
关键词
越野车车架
有限元分析
ANSYS软件
模态分析
刚强度分析
off-road vehicle frame
finite element analysis
ANSYS software
modal analysis
stiffness and strength analysis
