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采用有限元分析软件ANSYS,对电磁换向阀进行优化设计和计算,得出了相关尺寸的优化参数并与其它优化方法进行了比较.结果表明:利用ANSYS优化的计算过程简单易行,优化精度高,结果比较可信. 相似文献
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为配合卷板设备数控系统的研制和对卷板工艺过程进行优化,建立了三辊数控卷板成形过程的弹塑性大变形接触问题的有限元模型系统.系统研究了卷板过程的机理,建立了卷板模拟的弹塑性大变形有限元方程,研究了系统中单元的选取,接触边界条件的处理.根据该模型可对卷板过程中各几何控制参数和成形结果之间的关系进行精确计算.在此基础上开发了相应的有限元程序.计算实例证明了该系统的精确性和可靠性,为制定和优化卷板工艺过程提供了依据. 相似文献
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感应淬火电磁-热耦合场的有限元分析 总被引:3,自引:0,他引:3
从麦克斯韦方程组和导热微分方程出发,导出了轴对称感应加热工件的电磁场、感生涡流和温度场分布的基本方程;并以电磁场和温度场有限元分析为基础,建立了二维有限元分析模型,运用通用有限元分析软件ANSYS的耦合计算流程,对实际的工件感应淬火过程进行了仿真.计算中考虑了工件材料物理参数随温度变化对加热过程的影响.仿真结果形象地描述了感应加热中明显的邻近效应和集肤效应,试验工件的电流透入深度大约为3 mm.仿真温度分布曲线与试验曲线相吻合,说明仿真模型的准确性,为进一步研究感应淬火热处理加工过程提供了很好的依据. 相似文献
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文章研究内容针对TK6920型数控铣镗床主轴箱CAD分析及优化,运用solidworks软件建立了三维CAD设计分析模型,并采用ansys有限元软件建立了有限元模型并进行静态刚强度分析.计算分析了主轴箱的应力及应变,在此基础上构建了主体结构的优化计算模型,将主轴箱进行了优化设计,尝试了新的改变约束的方法,与初始设计进行对比分析,为主轴箱的结构设计及改造提供理论依据. 相似文献
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塑性加工过程有限元法模拟的现状和困难 总被引:17,自引:4,他引:17
本文从有限元模拟塑性加工过程的发展出发 ,研究并讨论了影响计算精度的主要因素。用一些计算实例 ,进一步说明模拟成功的前提条件和数值模拟的作用 ,并对数值模拟今后的发展方向进行了探讨 相似文献
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层复合阻尼镗杆的动力学分析 总被引:2,自引:0,他引:2
何将三 《中国有色金属学报》1995,5(3):144-148
从弹性力学基本理论出发,建立了层复合阻尼镗杆的数学模型,得出了纯扭转动载荷情况下的解析解,实例计算结果与有限元计算结果和实际测试数据基本一致。 相似文献
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响应曲面法优化气体淬火过程中的工艺参数 总被引:1,自引:0,他引:1
以轴对称问题气体淬火过程为研究对象,提出了阶段换热系数模型,进行了五因子三水平Box-Behnken实验设计.根据实验设计结果,将设计的变量水平代入本文开发的淬火过程有限元分析软件进行计算,用逐步回归法和响应曲面方法对实验结果进行拟合,建立了拟合变形程度、表面单元平均等效残余应力、等效残余应力标准差、平均表面硬度和表面硬度标准差的响应曲面公式.以变形程度为目标,建立了相应的优化目标函数,用Lagrange乘子法对优化目标函数进行了带上下限及约束函数的非线性优化.优化后,五项目标中的四项得到了有利的结果,使用优化后工艺参数进行气体淬火,可以提高零件的淬火质量. 相似文献
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CVVL电机是一种用于提升发动机性能、降低汽车耗油量的一款永磁无刷直流电机,以其为研究对象,以提高转子输出转矩、电机效率、降低转矩脉动和定子槽满率为优化目标,以永磁体厚度、转子外径、定子内径、定子槽身宽和定子槽身高5个对优化目标影响最大的结构参数为优化变量,利用仿真软件ANSYS平台对永磁无刷直流电机结构作多目标优化,得到最优解集,最后通过仿真和试验验证优化方法的可行性,结果表明优化后的电机性能全面提升,满足优化目标,本文的多目标优化方法可为永磁无刷直流电机的结构优化提供参考。 相似文献
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G. Q. Zhao R. Hufi A. Hutter R. V. Grandhi 《Journal of Materials Engineering and Performance》1997,6(3):303-310
This paper uses a finite element-based sensitivity analysis method to design the preform die shape for metal forming processes.
The sensitivity analysis was developed using the rigid visco-plastic finite element method. The preform die shapes are represented
by cubic B-spline curves. The control points or coefficients of the B-spline are used as the design variables. The optimization
problem is to minimize the difference between the realized and the desired final forging shapes. The sensitivity analysis
includes the sensitivities of the objective function, nodal coordinates, and nodal velocities with respect to the design variables.
The remeshing procedure and the interpolation/transfer of the history/dependent parameters are considered. An adjustment of
the volume loss resulting from the finite element analysis is used to make the workpiece volume consistent in each optimization
iteration and improve the optimization convergence. In addition, a technique for dealing with fold-over defects during the
forming simulation is employed in order to continue the optimization procedures of the preform die shape design. The method
developed in this paper is used to design the preform die shape for both plane strain and axisymmetric deformations with shaped
cavities. The analysis shows that satisfactory final forging shapes are obtained using the optimized preform die shapes. 相似文献
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Kriging metamodel global optimization of clinching joining processes accounting for ductile damage 总被引:1,自引:0,他引:1
Clinching is a very cheap and efficient cold forming process that enables to join two sheets without any additional part such as a rivet or a bolt. This paper deals with the optimization of the final mechanical strength of a joined component using a global optimization technique based on Kriging meta-model. The optimization process includes both the joining stage and the mechanical strength simulations. It is shown that accounting for plastic strain, residual stresses and damage occurring during clinching is essential if one wants to study the final mechanical strength of the clinched component. The global optimization leads to a 13.5% increase of the mechanical strength for tensile loading and to 46.5% increase for shear loading. The global optimization procedure also enables to study the influence of input geometrical variability on the final mechanical strength, which is essential from an industrial point of view. 相似文献
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The optimization of technology chains is usually conducted as a local problem of each individual process step. However, in order to optimize the technology chain in terms of product properties a local optimization is insufficient and a more holistic approach is indispensable. Existing methods, which consider the manufacturing history of a workpiece, are often accompanied by a high level of effort in research. This paper presents a systematic approach to integrate the manufacturing history into the technology chain optimization process going along with a significant reduction of effort compared to existing methods based on simulation and experiments. Resulting from previous methods and models a set of representative variables is identified to describe interactions and dependencies within technology chains. Furthermore, an approach consisting of three steps is developed which allows a visualization as well as an explanation of the cause-and-effect relationships within technology chains. This approach is used to deduce two different optimization strategies for technology chains. The first strategy allows a global optimization by adjusting specified parameters without changing the processes within the technology chain. Whereas the second strategy comprises a redesign of the whole chain. 相似文献
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压电磨削测力平台结构优化设计的核心是弹性环与传感器三向刚度相互匹配的问题。文章重点介绍了测力平台在力学建模过程中对弹性环刚度的定义,准确得出弹性环结构的优化边界条件。利用有限元分析法建立测力平台的三维实体参数化模型,完成测力平台弹性环的结构优化设计。通过性能标定实验验证,该测力平台的技术指标全面达到CIRP—STCC规定的动态型测力仪标准。 相似文献