基于两阶段狼群算法的自动化立体仓库作业集成优化

为提高单载具自动化立体仓库动态工况下的进出库效率,针对自动化立体仓库作业集成优化问题建立了仿真优化模型。模型根据货物重质、出入库频率划分货架区域,以指令内最小化单载具堆垛机运行时间为研究目标,设计了一种两阶段狼群算法对其进行优化。该算法使用狼群算法对货位分配和作业调度进行集成优化,求解过程体现出两优化问题之间的关联和反馈。实验结果表明,在不同的订单规模下,相比其他优化方式,两阶段狼群算法能得到满意解,并有效缩短自动化立体仓库的作业时间。     

铝型材立体仓库货位分配优化

针对铝型材立体仓库存储货物尺寸长、重量大的结构特点,将提高悬臂梁式货架安全性为主要目标,依据入库效率、货架稳定和货架平衡原则确立优化目标,建立了货物入库的多目标货位分配优化模型,并基于模拟退火遗传算法(SAGA)求解模型,获得最优分配结果。通过实例仿真分析,相比于传统的遗传算法(GA)和模拟退火算法(SA),SAGA能更快找到合理货物入库位置,并使得货架两侧悬臂梁受载平衡,有效提高铝型材立体仓库货物的入库工作效率和安全系数。     

基于入侵杂草算法的WMS货位优化分配的研究

近年来,仓储管理的发展越来越迅速,在物流业中所居的地位也越来越高。仓库的出入库速度是影响仓库效率的重要因素,因此合理的库位分配可以有效地提高仓库的作业效率。针对仓库货位分配策略问题,以相同产品存储相邻位置、提高产品出入库效率、提高货架稳定性为目标,建立了多目标优化模型;然后使用权重系数法将多目标优化模型转化为单目标优化模型;最后分别通过遗传算法和入侵杂草算法来求解该单目标优化模型,并使用Matlab软件进行了仿真实验。对比两种算法的仿真结果可以看出,采用入侵杂草算法可以有效地解决自动化立体仓库的货位优化分配问题。     

基于改进灰狼优化算法的自动化立体仓库作业能量优化调度

针对带有截止时间约束的自动化立体仓库出入库作业调度问题,以调度过程中堆垛机能量消耗为优化目标建立数学模型,并引入相应的惩罚函数。对于入库货物,同时考虑定位存储和随机存储两种入库策略,采用一种最近邻货位选择策略对随机存储货物进行合理货位分配。采用一种改进灰狼优化算法对问题进行求解,算法通过引入融合Lévy飞行的混合个体更新策略和多种群重组策略来增强算法的搜索能力。通过仿真实验验证了改进灰狼优化算法在求解自动化立体仓库出入库作业能量优化调度问题的有效性。     

基于遗传算法的自动化立体仓库储位优化研究

针对自动化立体仓库中货物储位分配策略研究关于多目标数学模型关键性问题。根据立体仓库中货物最佳位置分配的原则和策略,建立合理的货物出入库效率、货架稳定性和货物周转率的3个目标函数模型。根据立体仓库高效性能构建货物存取效率的调整优化模型,借助MATLAB程序对实际货物储位布局实例进行计算和求解并利用遗传算法获得了最优迭代解。仿真结果表明：采用遗传算法可以有效地优化货物储位分配,降低货架质心来提高稳定性,提高存储效率,改善和提高仓库智能化性能。     

基于遗传算法的航天零件仓库货位优化研究CSCD

为提高航天零件仓储系统中零件出库效率和货架稳定性,建立多目标货位优化模型,并通过简单加权处理,将其转换成单目标优化模型。对仓储系统三个月的历史订单数据进行处理,提出基于遗传算法的存储策略。对模型仿真求解时,引入模拟退火算法解决了遗传算法出现早熟的问题。结果表明,提出的策略结果明显优于随机存储策略(RS)、ABC分类存储策略(ABC)、就近存储策略(COL),能有效提高立体仓库货物出库效率及货架稳定性。     

基于自适应细菌觅食算法的立体仓库货位优化

针对自升式穿梭立体仓库中穿梭车无需提升机即可实现跨层移动的运行特点，以该立体仓库模型为研究对象，进行货位优化。分别建立以提高出入库效率、货物分类存放、提高货架稳定性和平衡各巷道穿梭车工作量为优化目标的数学模型，并通过权重系数法将多目标优化函数转化为单目标优化函数。在标准细菌觅食算法的基础上，通过自适应策略对趋化步长和迁徙概率进行动态调整，提出了一种自适应细菌觅食算法，并利用该算法对货位优化数学模型进行仿真求解。仿真结果表明改进后算法的收敛速度提升，自适应改进策略有效，优化后目标函数值降低，货位优化效果显著。研究成果为立体仓库货位分配提供了一个综合、高效的优化方案，同时经立体仓库实际应用也验证了自适应细菌觅食算法的可行性和实用性。     

基于遗传算法的航天零件仓库货位优化研究

为提高航天零件仓储系统中零件出库效率和货架稳定性,建立多目标货位优化模型,并通过简单加权处理,将其转换成单目标优化模型。对仓储系统三个月的历史订单数据进行处理,提出基于遗传算法的存储策略。对模型仿真求解时,引入模拟退火算法解决了遗传算法出现早熟的问题。结果表明,提出的策略结果明显优于随机存储策略(RS)、ABC分类存储策略(ABC)、就近存储策略(COL),能有效提高立体仓库货物出库效率及货架稳定性。     

省级计量中心仓储系统的货位优化研究

随着电网公司的发展和电力计量资产存储与检定的规模扩大,仓储系统的运行效率变得至关重要。本文以国网湖南省计量中心为对象,对其仓储系统的货位优化进行了研究,针对计量资产入库货位分配不合理导致仓储系统运行效率低下的问题,提出了应用遗传算法对货物存取效率和货架稳定性2个目标优化的方案,通过仿真和分析求解,得到合理的货位分配方案,提高了仓储系统的运行效率和稳定性。     

工业生产型立体仓库货位分配及优化

以工业生产型立体仓库为研究对象,针对其出入库口多、存储货物重量差异大和出入库频率高等问题进行研究。在常规的存储策略基础上,制定了多目标优化的分区存储策略,根据"上轻下重"、"上低温,下高温"和"COI分配规则"提出了以出入库频率、货物重量差异和货物温度差异等为规则的存储原则。建立了运用该策略进行货物货位优化的数学模型,结合Pareto最优解的概念对多目标优化问题进行了求解,确定了货物的货位分配。通过在某企业立体仓库的应用表明:该存储策略有效解决了货物存储时的条件冲突问题,完成了货位优化分配,实现了立体仓库的节能及高效运行。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.