共查询到20条相似文献，搜索用时 265 毫秒
1.
张伟 《西安文理学院学报》2009,12(3)
为进一步明确亥姆霍兹线圈所产生磁场的近场特性,文中尝试采用基于有限元方法的ANSYS软件对亥姆霍兹线圈进行了分析,首先采用ANSYS软件对亥姆霍兹线圈进行三维实体有限元模型和仿真,并将结果与用MATLAB语言绘制磁感应强度的空间分布图进行比较.仿真结果说明ANSYS有限元模型优于MATLAB语言,并且通过实验验证了所建的三维亥姆霍兹线圈有限元模型的有效性和正确性. 相似文献
2.
一类二阶微分方程组的特解 总被引：2，自引：0，他引：2
采用待定矩阵法,给出了非齐次项为一次多项式与三角函数乘积的一类三维二阶常系数线性微分方程组的特解公式,并通过算例验证了微分方程组特解公式的正确性. 相似文献
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《实验室研究与探索》2017,(7)
设计了三维钢桁架桥模型并进行静力试验分析,同时采用Matlab软件编制程序建立三维钢桁架桥静力有限元模型,按照试验静力加载工况对有限元模型进行加载分析。分析不同的单元类型、边界条件、截面尺寸对结果的影响,并与试验结果进行比较。结果表明,在垂直荷载作用下,采用杆单元和梁单元计算的位移结果都比较接近,模型采用铰接的计算结果比固结大,单肢角钢的模型刚度是双肢角钢的模型刚度的50%。理论模型在固结、双肢角钢条件下与试验结果接近。 相似文献
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采用螺旋CT对颌面部进行扫描,利用Mimics软件直接读取数据、处理数据并完成三维重建.建立了颌面部的三维模型,Mimics软件提高了建模效率,为进一步有限元分析提供精确的模型. 相似文献
6.
《常熟理工学院学报》2015,(4)
利用有限元分析软件ANSYS Workbench建立汽车扰流板的三维有限元模型,并对其进行预应力模态分析.采用子空间法提取预应力模态分析结果,获得各种不同车速下的汽车扰流板各阶固有频率和主振型,与不考虑预应力的模态分析结果进行对比分析.研究表明预应力提高了扰流板的各阶固有频率.随着车速的提高,各阶模态频率也不断增大,但低阶模态频率的变化比高阶模态频率变化更加显著. 相似文献
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文章针对三维泊松方程,讨论四面体有限元离散格式下的代数多重网格法.通过采用一种快速的粗化算法,提出了一种新的插值算子和迭代终止条件,设计了一种新的瀑布型代数二重网格法.数值实验表明这种新算法计算时间更短. 相似文献
8.
基于结构健康监测的润扬悬索桥有限元模型修正与验证 总被引：5，自引：0，他引：5
采用大型有限元分析软件ANSYS建立了润扬悬索桥的三维有限元模型并对其进行了自振特性分析,同时计算了各种工况下大桥的应力及位移响应.基于灵敏度的物理意义以及罚函数的思想,提出了一种结构有限元模型修正的新方法.该方法仍以自振特性为目标函数,以结构设计参数为待修正参数,但设计参数的上下限根据测试所得静力响应值和理论值的对比以及工程经验来确定,因此静力响应可用于验证修正后的有限元模型.采用结构健康监测系统数据及提出的方法对大桥有限元模型进行了修正与验证,得到了能够较好地反映大桥整体动静力性能的有限元基准模型,为润扬悬索桥的健康监测和损伤预警提供了研究基础. 相似文献
9.
文章利用SolidWorks建立起起重机箱形梁三维几何模型,利用HYPERMESH进行有限元前处理建立三维有限元模型,并根据实际工况施加载荷和约束,再利用有限元计算软件NASTRAN对其进行分析计算,对箱形梁在外载荷作用下的应力及变形进行了有效的模拟和计算,并对其动态特性进行了简单的模态分析,为快速、准确的对起重机性能的评估、故障分析与排除提供了一种新的途径。 相似文献
10.
王伟 《天津职业院校联合学报》2008,10(2):39-42
有限元分析在各个工程领域得到了广泛的应用,有限元法程序包亦成为CAD常用计算方法库中不可缺少的内容,并与优化设计形成了集成系统.应用这些计算分析方法,设计人员可高效合理地寻找最佳设计方案.通过利用三维CAD软件SolidWorks中的有限元分析工具COSMOS对联轴部件中的连杆进行分析及结构优化设计. 相似文献
11.
无损检测信号快速三维有限元模拟的组合方法 总被引：1，自引：0，他引：1
提出了一种基于三维有限元的电磁无损检测缺损响应快速模拟的组合方法, 该方法由三项技术构成, 分别是局部计算技术、差场技术和迭代解技术. 采用局部计算技术, 可以将三维计算区域限制在缺损附近的一个较小范围; 使用差场技术, 无缺损情形下的轴对称解可以用来简化三维网格生成以及快速获得三维解答; 而应用迭代解技术, 可以加速无损探头信号有限元模拟的矩阵方程求解. 实例计算表明本文方法是正确有效的, 可以节省大量的计算机资源. 相似文献
12.
In this paper, on the basis of the variational principles developed the finite element method (FEM) is employed for numerical solution of the inverse problem of 2-D unsteady compressible flow around oscillating airfoils by incorporating the non-reflecting far-field boundary conditions and a new unsteady Kutta condition. All unknown boundary (airfoil contour) and discontinuities(shocks and free trailing vortex sheets) are determined via the functional variation with variable domain and artificial density concept. For the numerical realization of the variable-domain variation, a special finite element with self-adjusting nodes is also suggested herein. The numerical results show that the present method is effective for the design of unsteady airfoil. 相似文献
13.
This paper presents a type of vibration energy harvester combining a piezoelectric cantilever and a single degree of freedom (SDOF) elastic system. The main function of the additional SDOF elastic system is to magnify vibration displacement of the piezoelectric cantilever to improve the power output. A mathematical model of the energy harvester is developed based on Hamilton??s principle and Rayleigh-Ritz method. Furthermore, the effects of the structural parameters of the SDOF elastic system on the electromechanical outputs of the energy harvester are analyzed numerically. The accuracy of the output performance in the numerical solution is identified from the finite element method (FEM). A good agreement is found between the numerical results and FEM results. The results show that the power output can be increased and the frequency bandwidth can be improved when the SDOF elastic system has a larger lumped mass and a smaller damping ratio. The numerical results also indicate that a matching load resistance under the short circuit resonance condition can obtain a higher current output, and so is more suitable for application to the piezoelectric energy harvester. 相似文献
14.
本文基于电磁场仿真软件Ansoft建立了一种三相四极同步电动机的几何模型,并建立了相应的数学模型,利用该软件对模型进行有限元仿真与分析。通过运用麦克斯韦方程组和虚功原理,得到了该电动机在指定电流下磁力线及磁通密度分布图,并计算在不同电流下的自感、互感及转矩的大小及关系,这些数据为下一步的动态分析和控制设计打下基础。 相似文献
15.
Yttria-stabilized tetragonal-zirconia polycrystals (Y-TZP) have been shown to have superplastic properties at high temperatures, opening a way for the manufacture of complex pieces for industrial applications by a variety of techniques. However, before that is possible, it is important to analyze the deformation and fracture mechanisms at a macroscopic level based on continuum theory. In this paper, an elastic-plastic material model with a theoretical large deformation is constructed to simulate the true stress-true strain relationships of superplastic ceramics. The simplified constitutive law used for the numerical simulations is based on piecewise linear connections at the turning points of different deformation stages on the experimental stress-strain curves. The finite element model (FEM) is applied to selected tensile tests on 3-mol%-Y-TZP (3Y-TZP) co-doped with germanium oxide and other oxides (titanium, magnesium, and calcium) to verify its applicability. The results show that the stress-strain characteristics and the final deformed shapes in the finite element analysis (FEA) agree well with the tensile test experiments. It can be seen that the FEM presented can simulate the mechanical behavior of superplastic co-doped 3Y-TZP ceramics and that it offers a selective numerical simulation method for advanced development of superplastic ceramics. 相似文献
16.
3-D scattering of obliquely incident plane p waves by alluvial valley embedded in layered half-space
The indirect boundary element method(IBEM) was established to solve the problem of 3-D seismic responses of 2-D topographies,by calculating the free-field responses with the direct-stiffness method and simulating the scattering wave fields with the dynamic Green’s functions of moving distributed loads.The proposed method yields accurate results,because the 3-D dynamic stiffness matrixes used are exact and the fictitious moving distributed loads can be acted directly on the interface between the alluvial valley and the layered half-space without singularity.The comparison with the published methods verifies the validity of the proposed method.And the numerical analyses are performed to give some beneficial conclusions.The study shows that 3-D scattering by an alluvial valley is essentially different from the 2-D case,and that the presence of soil layer affects not only the amplitude value of surface displacements but also the distribution of surface displacements. 相似文献
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In this paper, a stabilized finite element technique, actualized by streamline upwind Petrov-Galerkin (SUPG) stabilized method
and three-step finite element method (FEM), for large eddy simulation (LES) is developed to predict the wind flow with high
Reynolds numbers. Weak form of LES motion equation is combined with the SUPG stabilized term for the spatial finite element
discretization. An explicit three-step scheme is implemented for the temporal discretization. For the numerical example of
2D wind flow over a square rib at Re=4.2×105, the Smagorinsky’s subgrid-scale (SSGS) model, the DSGS model, and the DSGS model with Cabot near-wall model are applied,
and their results are analyzed and compared with experimental results. Furthermore, numerical examples of 3D wind flow around
a surface-mounted cube with different Reynolds numbers are performed using DSGS model with Cabot near-wall model based on
the present stabilized method to study the wind field and compared with experimental and numerical results. Finally, vortex
structures for wind flow around a surface-mounted cube are studied by present numerical method. Stable and satisfactory results
are obtained, which are consistent with most of the measurements even under coarse mesh. 相似文献
19.
A new method was worked out to improve the precision of springback prediction in sheet metal forming by combining the finite element method (FEM) with the data mining (DM) technique. First the genetic algorithm (GA) was adopted for recognizing the material parameters. Then according to the even design idea, the suitable calculation scheme was confirmed, and FEM was used for calculating the springback. The computation results were compared with experiment data, the difference between them was taken as source data, and a new pattern recognition method of DM called hierarchical optimal map recognition method (HOMR) is applied for summarizing the calculation regulation in FEM. At the end, the mathematics model of the springback simulation was established.Based on the model, the calculation errors of springback can be controlled within 10 % compared with the experimental results. 相似文献
20.
针对近年来农村公路水泥混凝土路面结构中出现的主要病害问题,介绍了小板块水泥混凝土路面温度应力的计算原理,以通用有限元软件ANSYS为基础,采用三维有限元法,对小板块水泥混凝土路面的温度应力进行分析,探讨了小板块水泥混凝土路面结构层参数对其温度应力的影响规律,为目前农村公路小板块水泥混凝土路面结构的设计应用及其后续理论研究提供了有益的参考. 相似文献