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利用Pro/E三维软件分别绘制后车架各组成零件,包括龙门梁、左右后纵梁、中部抗扭管及举升缸支座总成、尾部抗扭管,再利用软件的装配模块建立后车架的三维几何模型。对模型简化后导入到ANSYS Workbench中建立后车架的有限元模型,并选取满载静止、不平路面及举升工况作为后车架的分析工况,应用ANSYS Workbench软件求解后车架在3种工况下的应力与应变大小,最后对后车架进行模态分析,得出后车架的前10阶模态振型云图。 相似文献
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以某改款车副车架为研究对象,采用Hypermesh软件建立有限元模型,运用Nastran求解器进行刚度、强度及模态分析。分析结果表明:前副车架弯曲及扭转刚度满足目标要求;四种极限静态工况下,前副车架强度的最小安全系数为1.53,满足目标要求;前副车架单体约束状态下,其模态满足目标要求。 相似文献
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运用UG软件建立起某重型自卸车车架总成的三维模型,并利用有限元分析方法,采用壳单元进行网格划分以及合理的模型简化和连接方式,建立起某重型自卸车车架基于Nastran的有限元模型.对应车架在纯弯曲和扭转两种工况下,施加相应的边界条件和载荷条件,进行刚强度分析,得到车架在纯弯曲、扭转工况下的应力、应变图,找出车架中的薄弱部位并对薄弱部位进行结构优化.通过优化前后对比分析为后续车架结构改进提供理论依据. 相似文献
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管壳式换热器的振动特性分析及模态试验 总被引:2,自引:0,他引:2
针对某一型号管壳式换热器管程入口和出口处容易损坏的问题,采用有限元模态分析和试验模态分析相结合的方法,对其动态特性进行了分析。研究结果表明其固有频率在180Hz以上,避开了流体诱导振动产生的激振频率,但需加强其管程入口和出口处的刚度和壳体螺栓连接部位的连接强度。有限元模态分析方法可为其他类型管壳式换热器的动态特性快速评价和可靠性优化设计提供参考。 相似文献
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为了检验某轻型卡车的车架是否满足设计要求,应用CAE分析方法对其进行有限元分析。首先应用Hyper Works软件,模拟了车架螺栓和焊点的连接,研究了钢板弹簧建模及载荷添加方式,为了尽可能的模拟汽车实际情况,建立了带有货箱、驾驶室、各支架以及前后悬架的较完整的整车有限元模型;然后采用有限元求解软件MSC.Nastran对模型进行了扭转刚度和不同工况下的强度分析。结果表明,第三和第六横梁连接板最大应力远远大于许用应力,不符合强度要求;最后,提出了对该车架第三和第六横梁连接板的改进建议,并通过改进前后的分析结果对比,进一步验证了结构改进的有效性。 相似文献
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The purpose of the work described in this paper is to provide a computational tool for the design of roll-over protective structures (ROPS) comprised of thin-walled rectangular tubes. This tool simulates the multi-stage, regulatory quasi-static loading test (SAE Standard, SAE J1040 APR88) that new designs must pass. These tests are claimed to be indications of the performance of a ROPS under real (dynamic) roll-over conditions. The collapse of the framework involves large, three-dimensional deformation, which results mainly from large rotations in each member due to bending and torsion. To establish constitutive relationships for a framework model, biaxial bending collapse behaviour of thin-walled rectangular tubes was investigated using a kinematic approach to generate the bending interaction curves. The interaction between bending and torsion was examined separately using extensive finite element analyses of cantilevers modelled by the commercial finite element code ABAQUS. Approximate constitutive relationships were then formulated for a ‘hinge super-element’ to be implemented via the user-defined element subroutine UEL in ABAQUS. The hinge element consists of two nodes separated by a small distance. Each node has six degrees of freedom and the components of stiffness at each node are initially set to sufficiently large values to provide rigid response in the pre-collapse stage. When the collapse criterion is satisfied for the first time, the hinge element is switched to ‘softening’ hinge response and thereafter follows the local softening behaviour of a closed-section tube by modifying the stiffness of the three rotational components according to the constitutive relationships. To test the validity of the hinge model, the response of a simple, scaled ROPS to a simulated prescribed regulatory test load history (SAE Standard) was compared with the results from the analysis of an equivalent shell element model. Good agreement is demonstrated between the two models. 相似文献