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连铸二冷参数的优化和控制研究 总被引:1,自引:0,他引:1
近些年连铸过程模拟成为研究的重点,模拟的根本目的在于优化连铸过程.为在保证连铸坯质量的前提下进一步提高连铸生产率,基于数学上的子问题接近优化技术建立了连铸过程二冷参数优化系统,可对不同钢种、不同拉速、不同冶金限制准则下的二冷各段配水进行最优化.运用优化后的这些过程参数,将使铸机以最大生产率、最小消耗运行,同时又保证了生产无缺陷铸坯.整个优化系统包括两个模块,一个是热过程模拟模块,另一个是设计优化模块,系统靠在两个模块之间反复自动循环调用而使参数得到优化. 相似文献
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自改革开放以来,我国高等教育结构不断地发生着变化,高教层次结构也经历了多次革新,在明确界定高等教育层次结构涵义的基础上,回顾我国高教层次结构的优化历程,进而分析了我国高教层次结构不断进行优化的动力,并就现阶段的优化策略给出几点建议. 相似文献
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传统的优化方法在描述能力、建模方法、方法实现和模型数据的分析等方面都存在着局限性,需要引入新的思路.针对上述问题,提出了基于知识的广义优化方法,给出了广义优化中知识概念、优化问题的描述,以及基于知识的广义优化方法的一般求解过程.其基本方法是在优化问题知识模型的基础上,建立基于知识的广义优化算法,通过知识系统的约简,得到用于制定优化方案的决策规则.同时给出了基于知识的广义优化方法在在锅炉燃烧优化问题中的应用示例,说明了方法的有效性. 相似文献
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深入分析了我国水资源优化配置理论及相关模型,阐述了可持续发展与水资源优化配置的关系,提出了水资源优化配置研究的发展方向. 相似文献
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本文结合公司厂房搬迁进行的技术改造实践,分析了技术改造方案优化的必要性,提出了技术改造方案优化的总要求和方针、方法. 相似文献
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群体智能优化算法是根据生物集群运动、交互、进化等行为机制而开发的自然启发算法,凭借其显著的灵活性、适应性、鲁棒性以及全局寻优能力,被广泛应用于现实世界中各类优化问题的求解. 受羊群间歇性集体运动现象启发,本文提出了一种新的仿生群体智能优化方法—羊群迁徙优化(Sheep flock migrate optimization, SFMO)算法,创新性地建立了3个核心运算模块,即放牧算子、集体运动算子和补偿策略. 与现有的群体智能优化算法相比,SFMO可以通过广泛随机搜索指导下的种群迁徙,降低算法陷于局部最优的概率,为群体智能优化领域提供了一种新的解决方案. 收敛性证明和复杂度分析进一步为SFMO提供了理论支撑. 以CEC-2017基准函数为基础的数值仿真验证表明:SFMO能够有效解决函数优化问题,并在多模态函数优化问题中具有显著优势. 相似文献
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FeAl合金研究进展与发展方向 总被引:2,自引:0,他引:2
综述了FeAl合金的物理、力学性质,分析了造成合金延性低的主要原因——环境氢脆的产生原因和影响因素,概述了合金的加工方法和合金设计原则,最后指出了FeAl合金以后的研究重点和发展方向。 相似文献
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Xiu-Min Chen Bin Yang Dong-Ping Tao Yong-Nian Dai 《Metallurgical and Materials Transactions B》2010,41(1):137-145
The surface disproportionation reaction mechanism of aluminum subchloride on aluminum (110) surfaces has been investigated
using the plane-wave density functional theory (DFT). Three possible reaction mechanisms of AlCl disproportionation reaction
on aluminum (110) surfaces have been taken into account; the reactants and products structures have been optimized, transition
states have been confirmed, and activation energy has been calculated. The adsorption energy of reactants and the desorption
energy of products also have been calculated. All of these calculations have been employed to confirm the reaction mechanism
and the rate-determining step of AlCl disproportionation reaction on aluminum (110) surfaces. 相似文献
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高冰镍浸出机理及工艺研究 总被引:3,自引:0,他引:3
研究了高冰镍和软锰矿在硫酸中的常压浸出过程 ,查明了影响浸出速率和浸出效率的因素 ,阐明了软锰矿、二氧化锰和高冰镍中镍硫化物的溶解机理 ,探讨了浸出过程中β -NiS的生成机理 ,提出了强化浸出的措施 ,进行了浸出正交试验 ,获得了浸出控制的最佳工艺条件 相似文献
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Tantalate-columbate concentrate has been studied; namely, its chemical, phase, and granulometric compositions and radioactivity have been investigated. The thermodynamics of reactions of chlorination of the components of the concentrate have been calculated in the temperature range of 400–1273 K. A technique of laboratory chlorination has been developed and experiments have been performed at T = 750 and 800°C. The products obtained have been analyzed. The total degree of chlorination of the concentrate, as well as of tantalum and niobium, has been determined at various temperatures. 相似文献
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Prior research has shown that young refugees may be especially traumatised. The study includes 123 young Bosnian refugees, living at two Bosnian boarding-schools in Denmark who were given a revised version of the Harvard Trauma Questionnaire (HTQ). The subjects themselves have on average experienced seven traumatic events, and have either witnessed or had a family member experience an additional six events. Three-quarters have been shot at, have lost their homes and private possession and have been exposed to violence in the form of harassment or humiliation. Two-thirds have lost friends. Three-fifths have lived with uncertainty as to whether friends and family were alive or dead. More than half have seen dead and wounded people, have had their lives threatened and have thought that they would die. More than a third have lost close family members, have been wounded and have had their homes destroyed. Just under a third have been exposed to physical violence or have witnessed somebody being killed. A quarter have starved and been ill without being able to receive treatment. About a fifth have experienced captivity, torture and forced labour. 6% have been raped or exposed to other forms of sexual abuse. It is concluded that the young Bosnians examined are a multitraumatised group. Use of the HTQ increased the number of traumatic events quite considerably compared to the case notes. 相似文献
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建立了保温设备内钢锭热过程的数学模型,经实测验证,数学模型可用。举例计算并分析了保温设备对钢锭的保温和节能效果,探索了高温液芯钢锭装保温设备均热后直送初轧机轧制的可能性,讨论了保温设备的砌筑材料和壁厚对节能效果的影响。 相似文献
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