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Search Results: 1 - 10 of 312158 matches for " 王希诚 "
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一种全耦合多相流分析的并行计算方法

力学学报 , 1999, DOI: 10.6052/0459-1879-1999-3-1995-032
Abstract: 研究了孔隙介质中热、水和汽流全耦合分析的并行计算方法.模型中采用了考虑毛细压力关系的修正有效应力概念,并考虑了相变和潜热传递.基本变量为位移、毛细压力、汽压和温度.并行程序是在国家高性能计算中心(北京)的曙光1000A上借助PVM(ParalelVirtualMachine)软件系统实现的,考题显示出较高的并行加速比和效率
基于离散变量遗传算法的注塑模浇口位置优化设计
,安然
大连理工大学学报 , 2009, DOI: 10.7511/dllgxb200902002
Abstract: 建立了一个注塑模浇口位置设计的多目标优化模型,以浇口位置作为设计变量,优化充填过程中入口压力、温度分布等主要工艺参数以减小制品的翘曲程度.将拟精确罚函数和基于信息熵的多种群离散变量遗传算法相结合,发展了一种求解注塑模浇口位置多目标优化问题的迭代格式.在遗传进化中采用了多种群遗传策略和基于信息熵的空间减缩搜索技术,从而大大提高了遗传进化的效率.将该算法与注塑模流动数值模拟程序结合进行浇口位置优化设计.算例表明所提出的方法适用于注塑模浇口位置优化,并且有较好的计算效率和精度.
基于Kriging代理模型的多点加点序列优化方法
高月华,
工程力学 , 2012,
Abstract: 基于Kriging代理模型提出了一种同时考虑预测响应值及其不确定性的多点加点准则,并基于该准则发展了一套序列近似优化方法。多点加点准则基于初始样本信息和所预测的对象函数特征增加新样本集,以在寻优迭代过程中自适应地提高代理模型的精度。该文方法依据多点加点准则在一次迭代中增加多个空间无关的新样本点,适用于多机同时计算或并行计算,从而提高计算效率。以两个经典的数学函数为例,将该优化方法与期望提高准则方法进行了比较,结果表明该文提出的优化方法能够有效地提高最优解的全局性。将方法用于一盒式注塑件的成型工艺优化设计,优化结果也表明了该方法的有效性。
注塑制品的翘曲优化及影响因素分析
高月华,
化工学报 , 2007,
Abstract: 注塑制品的翘曲变形是一种严重的缺陷;本文提出一个最小化制品翘曲变形的近似优化方法。该方法用Moldflow软件进行制品的翘曲变形分析;借助于Kriging模型建立翘曲与优化参量间的函数关系;然后利用所建立的近似函数进行优化设计。以手机壳制品为例;用模具温度、熔体温度、注射时间和保压压力做设计变量;对制品进行了翘曲优化设计。结果表明;所提出的方法可以有效地减小制品的翘曲变形;最后对优化结果及影响因素做了较详尽的分析。
基于Kriging代理模型的稳健优化设计
高月华,
化工学报 , 2010,
Abstract: 稳健优化设计需要进行不确定性分析,优化过程比较费时。为提高计算效率,提出了基于Kriging代理模型的稳健优化设计方法。该方法结合双重Kriging代理模型和多点加点准则进行稳健优化设计。双重Kriging代理模型的建立,减小了不确定性分析的计算量,提高了计算效率。多点加点准则实现了序列的迭代优化,在保证计算效率的同时提高了对全局最优解的逼近程度。数学函数测试结果表明,与一般模拟基稳健优化方法相比,本文所提出的序列稳健优化方法在效率上有很大的提高。最后,考虑注塑工艺的不稳定性,对一盒式注塑制件的壁厚和工艺进行稳健优化,结果表明该稳健优化设计方法是有效的。
高聚物注塑成型填充过程有限元分析并行迭代算法
李征,
大连理工大学学报 , 2010, DOI: 10.7511/dllgxb201001001
Abstract: 进行了高聚物注塑成型填充过程并行数值仿真分析.首先给出问题的控制方程,然后用Galerkin法将其离散为有限元系统方程.发展了一个并行子结构迭代并行算法,该算法在有限元区域分解的基础上,将有限元节点分为子区域内部点、二子区域边界点和多子区域边界点,在此基础上实现了有限元方程的组集和求解的并行化,并研制了相应的程序.讨论了该算法的并行执行.最后给出两个注塑填充过程压力场分析的实例,数值算例表明所提方法有较高的并行计算效率,可以适应高聚物成型填充过程仿真分析的需要.
固液火箭冲压发动机研究
,南?
推进技术 , 2001,
Abstract: 为了研究适应较大空域稳定工作的冲压发动机,选定固液火箭冲压发动机为研究对象。确立了发动机的理论计算方法,优化了发动机的设计,并在试车台架上模拟大范围的飞行工况进行了试验考核,较好地验证了理论的正确性。固液火箭冲压发动机有其独特的性能,根据不同需求调整液体燃料与固体推进剂的比例,可达到最优组合,具有广阔的应用前景。
DPP-Ⅳ抑制剂三维药效团模型构建
3D Pharmacophore Model Construction of DPP-Ⅳ Inhibitors
 [PDF]

韩天佼, 李悦青, 谷俊峰, 曹志, 赵伟杰,
Hans Journal of Chemical Engineering and Technology (HJCET) , 2012, DOI: 10.12677/hjcet.2012.22010
Abstract: 以20个文献报道的二肽基肽酶Ⅳ(DPP-Ⅳ)抑制剂作为训练集,利用Discovery Studio构建了DPP-Ⅳ抑制剂的三维药效团模型。所得最优药效团模型Hypo1具有一个氢键受体,一个疏水基团,一个可离子化正电中心,一个芳香环和5个排除体积,Fischer交叉验证结果表明该模型具有较高的置信度。Hypo 1对测试集中20个DPP-Ⅳ抑制剂活性进行了预测,结果显示有较好的预测能力。利用该模型进行ZINC数据库搜索,得到预测活性小于10 nmol?L–1的化合物1369个。将这些化合物对接到DPP-Ⅳ的活性位点并根据PLP2评分函数筛选出21个评分较高的化合物,为设计和合成新型的DPP-Ⅳ抑制剂提供了理论参考。
The 3D pharmacophore model of DPP-Ⅳ inhibitors was established using the Discovery Studio software with the training set of 20 DPP-Ⅳ inhibitors. The best pharmacophore hypothesis (Hypo 1) consists of one hydro- gen-bond acceptor, one hydrophobic point, one positive ionizable group, one aromatic ring as well as five excluded volumes. Fischer’s validation clearly shows that proposed Hypo 1 has highly predictive ability and can be efficiently used as a 3D query for virtual screening to retrieve potential inhibitors from ZINC databases. The hit compounds sub- sequently were docked into the DPP-Ⅳ active site and 21 compounds were obtained based on PLP2 scoring function. Therefore, this study could provide scientific basis for denovo design of DPP-Ⅳ inhibitors.
A PARALELL ANALYSIS METHOD FOR FULL COUPLED MULTIPHACE FLOW 1)
一种全耦合多相流分析的并行计算方法

Wang Xicheng,

力学学报 , 1999,
Abstract: In this paper, we consider a full coupled multi phase problem involving heat and mass transfer in deforming porous media. The mathematical model consists of balance equations of mass, linear momentum and energy and of the appropriate constitutive equations. The chosen macroscopic field variables are temperature, capillary pressure, gas pressure and displacement. The gas phase is considered to be an ideal gas composed of dry air and vapour, which are regarded as two miscible species. The model makes further use of a modified effective stress concept together with the capillary pressure relationship. Phase change is taken into account as well as heat transfer though conduction and convection and latent heat transfer (evaporation condensation). Discretization of the non linear governing equations is carried out by means of finite elements in space and finite differeces in time. A multi frontal parallel method in conjunction with a Newton Raphson procedure is developed to solve above problem. The given domain of the problem is descretized into a finite number of subregions or subdomains. Multi fronts are used to assemble and eliminate internal variable concurrently in every subregion. The contributions for interface equations are obtained from the frontal operating arrays when every wavefront comes to the boundary of its own subregion. Interface equations are solved to obtain the values of the boundary nodes of the subregion. Once the values of the boundary nodes have been determined, the values within each subregion may be determined by a back substitution routines of the multi frontal procedures independently. This method has advantages shch as numbering of the finite element mesh in an arbitrary manner, simple programming organisation, smaller core requirements and shorten computation times. The parallel program is developed on Dawning Tiangchao (1000A) parallel computer. The PVM(Parallel Virtual Machine) system is used to handle communications among processors. Numerical examples are given to demonstrated the speedup and efficiency of this method.
涡轮叶片的解析成型与优化设计方法
正明,
工程热物理学报 , 2001,
Abstract: 本文发展了一种对于涡轮叶片用任意圆锥曲线作为基本曲线实现几何成型的解析方法,大量试算表明,该方法可以适应相当大一部分涡轮叶片几何造型的需要.本文还用正反问题相结合的方法对实用中的涡轮叶片进行改型优化,取得了较好效果,N-S流场分析表明,改型后的新叶栅比原叶栅性能有明显改善.
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