掘进机履带销有限元分析

通过合理的三维建模及力学分析,对掘进机履带销关键受力部位进行有限元载荷分析及计算,同时与传统力学计算进行对比分析,发现传统力学计算存在的缺陷,为履带销有限元计算方法提供计算依据。     

几何参数对空心楼板刚度的影响研究

本文采用ANSYS软件,以肋宽、肋高、底板和顶板厚度等构造参数为变量建立了系列有限元模型,分析研究了这些参数对现浇混凝土空心楼板刚度的影响大小和规律。为空心楼板的设计提供参考。     

基于SolidWorks的直齿圆柱齿轮建模方法与有限元分析

目的:使用Solid Works软件进行齿轮应力分析。方法:采用CAXA、Solid Works联合建模及Solid Works中公式曲线的方法进行齿轮建模。结果:在正确建模的基础上完成齿轮应力分析。结论:建模方法简单且较精确,能够满足齿轮应力分析的要求。     

桩-土-桩相互作用有限元接触分析

桩土体作为一个共同工作的系统,广泛存在于土木工程实践中,是典型的接触问题之一,对桩-土-桩相互作用的研究也是工程十分关心的,其中桩身摩阻力的分布更是关键所在。本文基于有限元数值分析方法软件对此进行了深入研究。     

整体式减速器箱体的有限元分析

采用ANSYS对整体式减速器箱体进行了有限元模态分析。运用SolidWorks建立了箱体的几何模型并导入ANSYS软件,在网格划分时兼顾考虑了分析精度和效率,得到了较好的有限元分析模型。最后利用BlockLanczos方法计算并分析了减速器箱体的前十阶固有频率和振型。模态分析结果对产品的故障诊断和设计改进具有基础研究价值。     

基于Ansoft的单相凸极式电容电动机有限元模型的建立与仿真

根据单相凸极式电容电动机运行原理和结构特点,利用Ansoft公司的Maxswell系列软件的二维涡流场与瞬态场对其进行建模仿真,进而对电机的稳态性能进行仿真模拟。最终通过仿真结果来查看电机的性能,为电机设计提供参考。     

现浇空心板抗弯受力性能及设计理论

本文主要对现浇空心板进行了非线性有限元分析,并且介绍了现浇空心板的受力特点和设计原理,从而说明此种结构的可行性,为今后的实际应用提供设计依据。并介绍了几种常见的空心板设计理论。     

High-order accurate implicit finite difference method for evaluating American options

A numerical method is presented for valuing vanilla American options on a single asset that is up to fourth-order accurate in the log of the asset price, and second-order accurate in time. The method overcomes the standard difficulty encountered in developing high-order accurate finite difference schemes for valuing American options; that is, the lack of smoothness in the option price at the critical boundary. This is done by making special corrections to the right-hand side of the differnce equations near the boundary, so they retain their level of accuracy. These corrections are easily evaluated using estimates of the boundary location and jump in the gamma that occurs there, such as those developed by Carr and Eaguet. Results of numerical experiments are presented comparing the method with more standard finite difference methods.     

某微型车膨胀箱安装支架的结构性能改进

文章通过解决某微型车膨胀箱松动问题,提出优化方案,更改支架结构,消除膨胀箱被磨损的安全隐患;总结了膨胀箱安装支架处的一些结构设计的要求,按低成本、高价值的理念,实现了通过更改结构来解决问题。     

Moment estimation in discrete shifting level model applied to fast array‐CGH segmentation

We develop a mathematical theory needed for moment estimation of the parameters in a general shifting level process (SLP) treating, in particular, the finite state space case geometric finite normal (GFN) SLP. For the SLP, we give expressions for the moment estimators together with asymptotic (co)variances, following, completing, and correcting Cline (Journal of Applied Probability 20, 1983, 322–337); formulae are then made more explicit for the GFN‐SLP. To illustrate the potential uses, we then apply the moment estimation method to a GFN‐SLP model of array comparative genomic hybridization data. We obtain encouraging results in the sense that a segmentation based on the estimated parameters turns out to be faster than with other currently available methods, while being comparable in terms of sensitivity and specificity.