基于协同量子粒子群的自动配煤系统优化

提出了一种基于量子粒子群算法的自动配煤优化方法,该方法首先对量子粒子群进行了改进,引入协同与学习策略提高了算法的搜索性能。在对自动配煤系统数学建模时,采用加权法将其由多目标优化问题转化为单目标优化问题,再通过协同量子粒子群优化求解。实验结果表明在对自动配煤系统的优化中,协同量子粒子群具有更优秀的搜索能力,能够快速、可靠、有效地获得最优解。     

基于自适应进化多目标约束的青霉素发酵过程优化EI北大核心CSCD

发酵过程多目标优化控制是提高发酵过程生产水平和经济效益的有效途径。提出了一种自适应进化多目标约束粒子群优化算法,并应用于青霉素分批补料发酵过程多目标优化。该算法根据不符合约束条件粒子的约束违反程度,修正了多目标粒子群优化算法的进化学习公式,提高了算法在约束边界区域的搜索能力;引入基于拥挤距离的Pareto最优解分布性动态维护策略,改进了Pareto前沿的分布性。实验结果表明,该算法能获得具有较好分布性的Pareto前沿,给出的底物补料策略能够使青霉素发酵过程在消耗更少底物的同时获得更多的产物产量,实现了发酵过程的多目标优化。     

解决多目标优化问题的一种粒子群优化算法

优化设计已发展成为一种有效的新型工程设计方法.粒子群优化算法作为一种新型优化算法,逐渐被用于解决多目标优化问题.但目前研究还较少,本文提出了一种基于Pareto解集的多目标粒子群优化算法.采用一个"记忆体"来存储当前得到的Pareto最优解,对当前所得到的Pareto最优解进行相互比较,以确定一个较优的微粒作为微粒群更新方程中的全局极值,由此来引导其它粒子尽快向最优靠拢,达到算法收敛的目的.测试函数的仿真实验结果表明该算法取得了很好的效果.     

一种动态邻域的多目标粒子群优化算法

针对粒子群算法在多目标优化问题中存在收敛性差,容易陷入局部最优等缺陷,提出了一种改进的粒子群优化算法。该算法在原有的粒子群算法上增加了两个操作:一是引入了一种变异算子,该变异算子为正态分布随机变异算子,可以使粒子在邻域内随机变异,使其在精英解集中搜索;二是在个体最优位置选取时,对未进入过精英解集的粒子进行变异,使其在新的可行域中寻找,从而加快粒子的收敛速度。经过测试函数验证,该算法可以加快粒子的收敛速度,使粒子更快找到最优解,提高解的收敛性。     

基于多目标种群协同算法的板坯入库优化

针对钢铁企业板坯入库决策问题,基于出库次序A型约束、分散性约束和垛位限高约束等构建了以板坯综合匹配度、垛位利用度和库存均衡度为目标函数的多目标入库决策优化模型。提出一种多目标种群协同粒子群优化算法,并设计了局部搜索策略以提高外部归档集中Pareto解的多样性,同时利用Pareto最优解改进粒子速度更新方式,达到多种群协同优化的目的。仿真实验证明,该算法可以更好地解决多目标板坯入库优化问题。     

基于多目标猫群算法的混流装配线排序问题

针对现实混流装配线上各工作站内设备闲置/超载的成本不同的问题,在传统的最小化闲置/辅助工作总成本目标的基础上,考虑不同工作站内设备闲置/超载成本的差异,建立了以改进的最小化工作站闲置/超载总成本、产品变化率和产品切换总时间为目标的多目标优化模型,并设计一种改进多目标猫群优化算法进行求解。提出一种基于线性混合比率的猫行为模式选择方法,以提高算法前期的全局搜索能力和后期的局部寻优能力;提出能生成分布广泛的候选个体、基于多样化搜寻算子的改进搜寻模式,拓展算法的搜索空间,提高算法的全局搜索能力。运用基准实例对所提算法与第二代非支配排序遗传算法、多目标粒子群算法、第二代强度Pareto进化算法进行比较,结果表明所提算法在解的收敛性、分布性和Pareto解的搜索能力上均具有优势。将该算法用于求解某实例企业的混流装配线排序问题,为车间调度人员的决策提供了多样化的选择,且优于车间已有方法的求解结果。     

一种混合算法在装配序列规划中的应用研究

基于现有复杂产品装配序列的特点,建立了装配体的几何可行性、零件的重新定向次数及装配体稳定性的目标函数。在原有离散粒子群算法的基础上,引入改进的进化方向算子,该算子可较为突出的改进离散粒子群算法的局部搜索能力。提出了一种混合算法,该算法在不牺牲粒子群算法的局部搜索能力和搜索速度的同时,提高其全局搜索能力,减少算法平均迭代的步数。算例表明:该混合算法具有优良的局部搜索特性及全局搜索特性,算法可快速收敛至全局最优解,可有效解决装配序列规划问题。     

基于小生境粒子群算法的柔性作业车间调度优化方法

针对柔性作业车间调度中的多目标优化问题,提出一种将小生境技术和粒子群算法相结合求最优解的优化方法。构建了满足约束条件的多目标优化模型,采用分段排列编码的方式表示染色体,利用粒子群算法获得存储非劣解的外部存档,基于小生境技术计算粒子的删除概率对其进行更新,保证了解的精度和多样性。为从Pareto最优解集中选出一个最满意解,提出一种总体价值估计选取方法。通过试验验证了该方法的有效性。     

-种基于Pareto解集的无约束条件的多目标粒子群算法

鉴于多目标优化问题的广泛存在性以及目前关于它的研究还较少,且没有一种很好的、通用的多目标PSO算法,本文提出了一种基于Pareto解集的多目标粒子群算法.通过采用一个"记忆体"来存储当前得到的Pareto最优解,对每次迭代得到的Pareto解集里的解两两进行比较以选取一个较优的解作为更新方程中当前最优解,这样可以更好的引导粒子群进行下一步的寻优操作,最终得到一个完整的Pareto最优解集.几个测试函数的仿真实验结果也表明了该算法取得了很好的效果.     

离散粒子群优化算法求解多目标柔性作业车间调度问题

对多目标柔性作业车间调度优化问题进行研究,提出了一种基于Pareto档案的离散粒子群优化算法。在该算法中,种群中的粒子通过与其自身历史最优位置(pbest)以及种群全局最优位置(gbest)的交叉实现粒子位置的更新。对于多目标优化问题来说,一次迭代可能产生多个gbest,引入一个Pareto档案用于保存迭代产生的优秀个体。并将Pareto档案维护与gbest选择同时进行以确保Pareto档案中的个体必然为一些粒子的gbest。进而将变异操作引入到粒子群算法以增强其局部搜索能力。最后,将该算法应用于几个典型实例,并通过与几种已有算法的对比验证了其有效性。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.