共查询到20条相似文献,搜索用时 15 毫秒
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有限元法(FEM)在结构分析中有着广泛的应用.通过对某车型前门建立有限元分析模型,分析其刚度,得出车门原有结构方案刚度值相比设计目标值有较大富余的结论,由此提出两种结构轻量化方案:改进车门加强板结构和采用激光拼焊板.两种方案都有效地减薄了车门料厚,达到了轻量化的目的. 相似文献
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Hanmin PENG Yao HUI Qingjun DING Huafeng LI Chunsheng ZHAO 《Frontiers of Mechanical Engineering》2010,5(2):204
Recently, a type of flexible grippers with low power supply (0–5 V) has been designed and developed for grasping small but precision parts. In previous work, the authors manufactured a soft gripper whose actuating components are made of ionic polymer-metal composite (IPMC) materials; however, there is not a comprehensive model to analyze the complete mechanics for this IPMC gripper. Therefore, this paper provides a finite element method for analyzing its static mechanics characteristics in the state with maximal stress and strain (i.e., the gripper opening largest, including the IPMC deformation, stress, and strain). Further, these electromechanical coupling relationships can be simulated by using the piezoelectric analysis module based on ANSYS software. The simulation results show that the maximal tip displacement of IPMC strips can nearly reach their own free length, the maximal stress is 54 MPa in the center of copper electrodes, and the maximal strain is 0.0286 on the IPMC strip. The results provide detailed numerical solutions and appropriate finite element analysis methodologies beneficial for further research on the optimization design, forecast analysis, and control field. 相似文献
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Numerical analysis of projection welding on auto-body sheet metal using a coupled finite element method 总被引:1,自引:1,他引:0
W.-F. Zhu Z.-Q. Lin X.-M. Lai A.-H. Luo 《The International Journal of Advanced Manufacturing Technology》2006,28(1-2):45-52
A comprehensive finite element method employing a subroutine to link up submodules of commercial code ANSYS is proposed to
perform analysis of projection welding in quantitative detail. In order to solve the complexity due to dynamic changes in
heat and electrical current flow paths, as well as temperature-dependent material properties, information about contact interfaces
and the geometry of the projection areas have been taken into account. By updating parameter information among these submodules
in an incremental manner, a truly thermal-electrical-mechanical coupled numerical analysis is realized for projection welding
simulation. A case study of an automotive door assembly welding process is carried out and a series of experiments is conducted
to confirm the validity of the newly developed method. The agreement between the experimental and numerical results is satisfactory,
indicating that the incrementally coupled finite element method may be suitable for projection welding research. Finally,
future work to extend this method in optimizing projection welding process design is also presented. 相似文献
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周娟利 《机械设计与制造工程》2016,(8):22-26
针对传统理论计算分析方法仅适用于外廓简单配合零件的局限,利用有限元法模拟了轴毂过盈配合分析过程,分析结果与传统理论分析结果具有较好的一致性.在此基础上,对某机构复杂轴毂配合情况进行了有限元法计算,该方法为复杂外廓零件的过盈配合计算提供了有力的依据.研究成果为校核连接零件强度、计算传动能力提供了依据,从而能更好地利用过盈配合的结构形式为机械设计服务. 相似文献
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应用有限元分析计算软件建立摩托车车架有限元模型,进行了结构静强度分析、模态分析、改进前后对比分析和应力测试实验,提出了车架结构优化改进方案。分析结果显示,改进后车架整体应力值有所下降,上横梁管与加强板连接处应力集中现象得到很大改善,车架整体变形量较改进前减小,具有良好的减振效果,舒适性较好。通过对车架这一摩托车关键部件的有限元分析和结构优化改进,为摩托车的开发设计打下了坚实的随机动态仿真基础,摩托车的整体设计将依托这一基础,应用计算机辅助工业设计进行三维数据模型建立、验证和修改,可以大大缩短工作流程,提高工作效率和数字化集成水平。 相似文献
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通过对机械结构疲劳分析的一般方法,结合目前工程技术领域广泛应用的有限元分析技术,以机车构架为载体进行结构的疲劳分析,并对设计的结构进行相应的改进,缩短了设计周期,减少了实验次数及成本,提高了设计产品的可靠性. 相似文献
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主要研究直齿圆柱齿轮的固有振动特性,利用ANSYS有限元软件建立直齿圆柱齿轮的三维模型并对其进行动力学模态分析,通过求解分析得到齿轮的低阶固有频率、主振型以及相对位移和相对应力,为齿轮及其系统的动态设计提供参考依据。 相似文献
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介绍运用有限元方法对柴油机机活塞进行热分析的方法。具体针对某型号柴油机,分析其活塞稳态温度场和热变形。分析结果表明,活塞最高温度出现在活塞头部,为377.22℃;活塞轮廓的径向变形最大值为0.451mm,也发生在活塞头部。并对活塞热态纵向型线进行拟合,为活塞冷态纵向型线的设计提供参考依据。 相似文献
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In this paper, a moving finite element (MFE) method is proposed to perform the dynamic analysis of a simply supported beam for a moving mass (MM). The MFE method treats the moving mass as a moving part of the entire system, so that the transverse inertial effects caused by the moving mass may easily be taken into account. The solution to the beam’s dynamic behaviors including its displacement is obtained via a Newmark-β method; the effects of the velocity and weight of the MM on the beam’s dynamic behaviors are further discussed. The numerical examples show that the inertial effects of the MM significantly affect the transverse responses of the simply supported beam. 相似文献
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阐述了模态分析基础,完成了虚拟环境中车身的模态分析。通过对车身的模态分析,获得了车身结构固有的振动特性,并找出了车身结构在动态激励时的薄弱环节。对车身结构的改进具有指导意义。 相似文献
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基于有限元分析的结构优化设计方法 总被引:7,自引:0,他引:7
提出了利用ANSYS优化分析功能对结构进行优化分析的方法,通过十杆桁架的优化分析介绍了用有限单元法解决实际问题,实现优化设计的全过程,说明了用ANSYS优化分析功能实现结构优化分析的可行性,从而为其它复杂结构的优化分析提供了新的方法和科学依据。 相似文献
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This paper describes a new algorithm to handle problems in dynamic finite element analysis and run-time simulation, where mesh re-generation or dynamic adjustment is required. Based on a concept called coded box cell (CBC) substitution, this algorithm can be applied to both initial mesh generation and dynamic mesh adjustment along the border zones of multiple primitives that form an entire model. During the initial mesh generation, appropriate labels are assigned to the nodes and the faces of each finite element. These labels are used to facilitate decision-making in dynamic mesh adjustment. A mapping technique is adopted to transform curved surfaces to plain surfaces for the ease of automatic mesh adjustment while still using the same algorithm. The results of a case study show that a finite element mesh can be adjusted dynamically and locally around its border zone; and the algorithm can be utilized effectively to simulate the thermal behavior of a device under real operating conditions. 相似文献
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惯导系统轻量化设计产生的结构柔性对其振动响应会产生不可忽略的影响。针对某型轻量化惯导结构,采用基于频响函数的子结构综合方法,建立了惯导系统的动力学模型,并应用此模型分析了IMU柔性对惯导系统的影响,并提出了一种减振系统参数优化设计方法。通过减振器优化,惯导系统的角位移明显减小,有效抑制了振动耦合。最后通过振动实验验证了优化方法的准确性,同时发现惯导系统经减振器参数优化后提高了振动过程中惯导系统航向和姿态测量精度。 相似文献