影响电液比例溢流型三通减压阀输出压力因素的数值分析

液动力、弹簧力、液压力等内部扰动影响压力控制阀的输出量与控制量的关系.本文通过数值分析非线性电液比例溢流型三通减压阀的输出量受控制量和干扰量的影响,为定量设计分析液压阀提供一种使内部扰动影响最小化的新方法.     

生态家具设计策略

本文将生态学观点引中到家具设计中来,对与生态有关的家具设计问题进行了一定的探讨,提出了生态家具设计的策略方法。     

基于结构风险最小化的加权偏最小二乘法

为了在偏最小二乘法(PLS)建模过程中实现结构风险最小化(SRM),提出基于结构风险最小化的加权偏最小二乘法(WPLS)。WPLS先提取训练样本中的主元,然后使用支持向量机(SVM)训练算法计算训练样本权值,最后计算原始论域中的回归模型。该算法保留了PLS能有效地提取对系统解释性最强的信息的优点,并通过样本权值提高模型的泛化能力,从而实现SRM准则,所建立的模型具有可解释性。仿真计算证明了模型的有效性。     

后非线性混叠信号盲源分离算法综述

结合非线性盲源分离研究不断发展的现状,选取最常见的后非线性混叠信号盲源分离问题为对象,综述其算法,介绍了解混叠模型,说明了基于广义Gram-Schmit正交化构造解的存在性及非唯一性.在此基础上,阐释了分离方法和思路,概述了基于互信息最小化的独立性测度,并分析评述了不断涌现的后非线性盲源分离典型算法.最后指出,目前关于后非线性盲源分离算法的研究存在的共性问题,并对进一步的研究方向进行了展望.     

遗传算法在齿轮减速机优化设计中的应用

从理论上探讨了基因遗传算法 (GA)与传统约束优化设计方法相结合的可能性 ,并从中发现“基因遗传算法+惩罚函数法”非常适合求解复杂的非线性约束优化问题 ,且成功地采用了“基因遗传算法 +惩罚函数法”对一个通用的二级斜齿圆柱齿轮减速机的概率可靠性优化设计的数学模型进行求解 ,与传统的优化方法相比 ,得到了一个较为理想的全域最优解 ;同时该方法也改善了基因遗传算法的局限性     

微细铣削毛刺形成研究

微细铣削是在广泛材料范围内制造精密三维微小零件的一种柔性的、经济的加工方法,微细铣削的主要问题之一是有毛刺产生,对微细铣削过程中毛刺的形成及其影响因素进行实验研究与分析,得到微细铣削过程中各因素对毛刺形成影响的一般规律,在此基础上,通过合理地选择切削参数以及刀具路径规划,达到减小毛刺的目的。     

Flexible mass transfer model for water minimization in batch plants

This paper presents the least constrained mass transfer mathematical formulation for freshwater minimization in multipurpose batch chemical processes with central reusable water storage. The mathematical formulation is an extension of the model developed by Majozi [T. Majozi, Wastewater minimization using central reusable water storage in batch processes, Computers and Chemical Engineering Journal 29 (7) (2005) 1631–1646]. In the latter model four scenarios were considered with various limitations or constraints. In the scenario presented in this paper only the mass load is fixed, whilst both the quantity of water used in a particular operation and outlet concentration are allowed to vary. In essence, fixing the mass load is more representative of the practical case. A solution procedure for the resultant nonconvex mixed integer nonlinear programming (MINLP) model is also presented. The solution procedure first involves reformulating the MINLP into a relaxed linear model (MILP). The MILP is first solved, the solution of which forms a feasible starting solution for the MINLP. Presented are two illustrative examples.     

核电厂放射性废物治理现状及面临的主要问题

根据大亚湾核电基地在放射性废物管理方面的经验, 结合二代改进型机组及三代机组核电厂已采用的废物处理技术, 对我国核电厂放射性废物管理现状和存在的问题进行了分析, 并提出改进建议。     

Minimizing manufacturing costs for thin injection molded plastic components

Minimizing the cost of manufacturing a plastic component is very important in the highly competitive plastic injection molding industry. The current approach of R&D work focuses on optimizing the dimensions of the plastic component, particularly in reducing the thickness of the component during product design, the first phase of manufacturing, in order to minimize the manufacturing cost. This approach treats the component dimensions established in the product design phase as the given input, and uses optimization techniques to reduce the manufacturing cost of mold design and molding for producing the component. In most cases, the current approach provides the correct solution for minimizing the manufacturing cost. However, when the approach is applied to a thin component, typically when miniaturizing products, it has problems finding the true minimum manufacturing cost. This paper analyses the shortcomings of the current approach for handling thin plastic components and proposes a method to overcome them. A worked example is used to illustrate the problems and compare the differences when using the current approach and the new method proposed in the paper.