集装箱装船顺序问题的启发式算法研究

针对集装箱堆场快速、高效装船作业的实际需求,结合集装箱码头作业状况深入分析了倒箱产生的原因。基于给定的堆场集装箱堆存状态和集装箱装船配载图,研究堆场集装箱装船顺序确定问题,提出了一种以最小化倒箱量为目标的集装箱装船顺序的启发式算法,建立了基于规则的改进策略。最后用实例证明了算法的准确性和实用性,能够为集装箱码头装船作业提供决策依据,从而提高其作业效率和服务质量。     

大型集装箱码头轨道龙门起重机应用新技术

基于对我国第一个应用现代轨道龙门起重机(以下简称轨道场桥)的大型专业集装箱码头研究,系统地分析和总结了大型集装箱码头,应用轨道场桥的技术优势和堆场作业操作的新技术,提出了轨道场桥消除堆场作业峰值的新方法,并从实际应用角度论证轨道场桥是目前和未来集装箱码头堆场最合适的装卸设备。     

龙门起重机的防拖架吊起保护系统

日益发展的物流行业，集装箱运输是发展方向。而现在集装箱堆场作业中，龙门起重机(以下简称场桥)是主要设备之一，在堆场码头场桥从拖车车架上取箱到堆场时，由于拖车锁箱销没打开等原因，起重机将箱和拖车一起吊起的事故时有发生，而这种多发事故的危害是非常大的，轻则拖车锁销损坏、拖车损坏，     

集装箱码头出口箱集港堆存模型研究

介绍了与集装箱堆场相关的业务,针对非自动化集装箱码头最常见的岸桥-集卡-轮胎吊装卸系统,以最复杂的出口箱场箱位分配为切入点,提出了从计划分配到动态分配的三阶段箱位分配法,给出了各阶段的优化目标.重点研究了三阶段中的具体箱位分配问题,详细分析了该问题的影响因素,提出了基于不同优先级的决策模型框架.各级子模型适用于不同的堆场密度,可分别构建并求解,并可嵌入到集装箱码头的生产营运信息系统中,为最终实现箱位分配智能决策支持系统奠定了理论基础.     

一种基于最佳优先搜索算法的集装箱堆场场桥调度策略

集装箱堆场管理承担着集装箱码头较多的业务,对整个集装箱码头的运作效率有着较大的影响．由于堆场中各箱区作业量是实时变化的,因此对堆场设备的动态调度就显得尤为重要．在以提供一种新颖的场桥调度策略为目标的情况下,构建了一种基于整数规划的场桥动态调度模型,该模型以各箱区各时段预测的工作量为前提,以达到各时段中剩余的总工作量最小的目标．由于该模型的求解属于NP（nondeterministic polynomial）难问题,所以采用了一种启发式算法：最佳优先搜索算法,来作为求解该模型的算法．最后,通过对某集装箱码头堆场的仿真来说明该系统,结果表明该模型和算法的有效性和实用性．     

集装箱码头装船贝内发箱顺序决策

随着世界集装箱海运量的不断增加及集装箱船舶的日益大型化,集装箱装卸作业的稳定高效已成为港口经营者关注的重点,所以在装船作业中如何通过优化发箱顺序决策提高装船效率也变得尤为重要.针对集装箱码头装船贝内发箱顺序的决策问题,考虑船舶大型化对于防悬空约束、分舱盖板约束,以翻箱次数最少、移机次数最少和转场次数最少为目标,建立集装箱装船贝内发箱顺序的决策模型.然后设计模型算例,通过对于算例结果的分析验证模型的有效性.相关思路及研究方法对于集装箱码头装船作业时的贝内发箱顺序决策具有借鉴意义,同时,模型的构建方法对于研究同类基于空间布局的组合优化问题具有一定借鉴意义.     

集装箱堆场道口选箱资源配置协同决策

以集装箱后方堆场以及无水港的提箱作业为主要研究对象,针对无水港及集装箱后方堆场设备资源配置紧张的现状,提出了一种道口选箱与机械资源配置协同决策的方法.该方法将机械资源配置融入了道口选箱的决策过程之中,并突破了传统的以道口为中心的单点决策方式,将提箱任务以类似招标的模式发布到各个可能的提箱点,进而由各邻近场吊智能终端来进行协同决策,并将决策结果以投标的形式反馈至服务器从而形成最终的方案.经过算例分析,证明了方法的有效性,同时该方法对于提高集装箱堆场的生产作业效率具有一定的应用价值.     

集装箱龙门起重机吊具与集装箱拖车快速对位系统研究

在港口集装箱堆场装卸作业过程中,集装箱龙门起重机发挥着巨大作用。随着港口集装箱吞吐量的上升,提高装卸效率势在必行。现场分析场桥装卸工艺会发现,场桥吊具与集装箱拖车的对位是制约场桥装卸效率的瓶颈环节之一。因此,开发了一种利用激光测距技术来完成场桥吊具与集装箱拖车快速对位的系统。实践证明该系统可以提高场桥装卸效率,降低拖车司机劳动强度,避免安全隐患。     

浅谈轮胎式集装箱门式起重机的安全检验

集装箱起重机包括集装箱门式起重机和集装箱装卸桥（以下简称岸桥）。前者分为轨道式和轮胎式2种,目前港口多采用轮胎式,主要用于集装箱堆场（以下简称场桥）装卸作业。毫无疑问,无论是数量的增加,还是新技术的运用,都对从事起重机安全检验工作的广大同仁提出了新挑战,故应不断掌握新技术,适应新形势的发展。     

考虑外集卡的混堆集装箱码头多场桥调度

针对混堆模式下集装箱码头的多场桥调度问题,考虑该模式下内外集卡等待对码头作业成本影响程度的不同,以及多场桥作业时相互间的干扰和堆场内集卡等待时间上限等约束,提出一个多场桥调度整数规划模型。为提高遗传算法的全局寻优能力,设计了新的变异操作,引入了解空间切割方法,并在算法框架中嵌入基因修复技术,提出改进遗传算法进行求解。通过多次数值实验,验证了算法的优越性;基于不同任务规模的实验分析,验证了所提调度方法的有效性。     

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.     

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。     

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....     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.