ANSYS前处理与AutoCAD的系统集成

介绍了一种基于ObjectARX的ANSYS前处理与AutoCAD的系统集成方法，开发的系统以面向对象的ObjectARX作为开发工具，实现与AutoCAD的无缝结合，能够方便地将AutoCAD几何模型转换为ANSYS有限元模型。     

Mixed Approximation Scheme of the Finite-Element Method for the Solution of Two-Dimensional Problems of the Elasticity Theory

For the solution of two-dimensional boundary-value problems of the elasticity theory, a triangular finite element, ensuring stability and convergence of mixed approximation, is proposed. The system of resolving equations of the mixed method is derived with account of strict satisfaction of static boundary conditions at the surface. To solve matrix equations of the mixed method, various algorithms of the conjugate-gradient method with the pre-conditional matrix have been considered. Numerical data on convergence and accuracy of the solution for a number of test problems of the elasticity theory and fracture mechanics are given. The results obtained by the conventional and mixed finite-element method approaches are compared.     

轴对称结构非接触供电动态特性研究

采用仿真分析与实验验证相结合的方法研究了旋转状态下非接触传能系统的性能。利用两谐振线圈的电磁耦合,从理论上建立等效电路模型进行阻抗匹配。利用有限元分析软件,建立了三维仿真模型,研究了不同旋转速度下,轴向间距、径向偏移以及倾斜角度对非接触能量传输系统性能的影响规律。同时利用搭建的实验平台进行稳态验证,与仿真结果对比,表明有限元仿真模型的有效性和准确性。最后,利用经过检验的仿真模型,研究了系统的瞬态特性以及磁场分布,证实改变旋转速度几乎不影响系统的传输功率,这为非接触传能技术应用于电机无刷励磁等旋转装置提供了有益的参考。     

Utilisation of oil-contaminated sand stabilised with cement kiln dust in the construction of rural roads

This article investigates the strength behaviour of oil-contaminated sand stabilised with cement kiln dust (CKD) in order to assess the engineering properties of the stabilised soil for its application in the construction of rural road. Tests including pH measurement, compaction, unconfined compressive strength (UCS) and California bearing ratio (CBR) were conducted. The investigations were carried out by varying the percentage of CKD, the percentage of oil content, the type of oil, the ageing of stabilised samples and the ambient temperature. Depending on the pH response, the CKD content from 5% to 15% represents a practical limit for cost-effective stabilisation. Results revealed that an increase in the UCS and CBR values of oil-contaminated sand occurred with the addition of CKD. The strength of stabilised contaminated sand decreases as the percentage of oil increases. The addition of 10% CKD to the sand contaminated with 6% oil content is found to give the optimum UCS and CBR values. Furthermore, a series of two-dimensional finite-element model was developed using PLAXIS software package.     

Magnetic resonance imaging-based computational modelling of blood flow and nanomedicine deposition in patients with peripheral arterial disease

Peripheral arterial disease (PAD) is generally attributed to the progressive vascular accumulation of lipoproteins and circulating monocytes in the vessel walls leading to the formation of atherosclerotic plaques. This is known to be regulated by the local vascular geometry, haemodynamics and biophysical conditions. Here, an isogeometric analysis framework is proposed to analyse the blood flow and vascular deposition of circulating nanoparticles (NPs) into the superficial femoral artery (SFA) of a PAD patient. The local geometry of the blood vessel and the haemodynamic conditions are derived from magnetic resonance imaging (MRI), performed at baseline and at 24 months post intervention. A dramatic improvement in blood flow dynamics is observed post intervention. A 500% increase in peak flow rate is measured in vivo as a consequence of luminal enlargement. Furthermore, blood flow simulations reveal a 32% drop in the mean oscillatory shear index, indicating reduced disturbed flow post intervention. The same patient information (vascular geometry and blood flow) is used to predict in silico in a simulation of the vascular deposition of systemically injected nanomedicines. NPs, targeted to inflammatory vascular molecules including VCAM-1, E-selectin and ICAM-1, are predicted to preferentially accumulate near the stenosis in the baseline configuration, with VCAM-1 providing the highest accumulation (approx. 1.33 and 1.50 times higher concentration than that of ICAM-1 and E-selectin, respectively). Such selective deposition of NPs within the stenosis could be effectively used for the detection and treatment of plaques forming in the SFA. The presented MRI-based computational protocol can be used to analyse data from clinical trials to explore possible correlations between haemodynamics and disease progression in PAD patients, and potentially predict disease occurrence as well as the outcome of an intervention.     

芯棒锥面结构对孔冷挤压强化残余应力场的影响

为了在紧固孔周引入均匀的残余压应力,以延长紧固孔构件的疲劳寿命、提高其抗应力腐蚀性能,利用ANSYS有限元软件,建立了轴对称弹塑性有限元模型,对直接芯棒冷挤压强化过程进行了仿真,特别是对芯棒的前锥段曲线结构形式进行了设计与分析,研究了前锥段曲线形式对残余应力场分布的影响.结果表明:孔壁表面的周向残余应力分布复杂且不均匀,比较而言,外凸型正弦曲线型芯棒所产生的残余压应力沿孔壁深度方向分布更加均匀;几种曲线形式的芯棒在上表面近孔边区域均产生了径向残余拉应力,在孔的挤入段产生了轴向残余拉应力,但外凸型正弦曲线型芯棒在上述区域所产生的残余拉应力较小,且分布区域也较小.     

基于ANSYS的机床结合部建模方法探讨

机床结合部的模态分析一直以来都是整机动态分析的一个难点,本文对于机床结合部的建模提出了几种不同的方法:直接法,节点耦合法,弹簧阻尼模拟法以及等效模型分析法。在分析比较之后得出各个方法的优缺点,以此为今后在不同需求时运用更合理的有限元模型分析结合部提供指导意义。     

重型轨道车车体设计计算初探

叙述了重型轨道车车体的结构特点、计算模型、计算载荷和计算工况 ,以及车体强度和刚度的评定标准。最后通过计算分析 ,校验说明该车体结构设计合理 ,满足了机车总体布置和国家相关标准对机车静强度的要求。     

不对称混合连接的抗震性能模拟及关键参数研究

不对称混合连接属于后张有阻尼干连接延性节点,采用有限元分析程序DRAIN_2DX研究梁柱节点在低周反复荷载下的抗震性能.有限元分析结果表明:滞回曲线明显呈不对称形状,正向加载时的滞回曲线较为饱满,耗能较好,反向加载时的滞回曲线所包围的面积较小,耗能较差;滞回曲线大体呈反S形,随着位移的增加逐渐向弓形过渡;截面初始预压应...     

矿井架空人车驱动装置轴联接件的设计改进

将矿井架空人车减速器输出轴与驱动轮轴传统的联连接方式改为渐开线花键联接。轴联接件的一端设计为带有双键键槽,与减速器输出轴联接,联接件的另一端设计为内渐开线花键,与驱动轮轴联接,驱动轮轴端为渐开线外花键。借助有限元分析软件ANSYS Workbench对此元件有限元分析。为驱动轮轴和减速器输出轴联接方式的选择提供了参考。