2800mm超快冷全液压预矫直机项目

预矫直机在国内外均属于新开发项目,主要是为了改善ACC超快冷的冷却效果。南钢2 800 mm超快冷全液压预矫直机项目将原ACC装置全部拆除,在原ACC区域新增预矫直机及超快冷装置,不仅提高了热板矫直机矫直的一次通过率,而且有效地提高了板材质量。     

ACC水处理淬火变频自动化控制系统的创新

宽厚板项目ACC水处理控制系统是MULPIC区域的水处理系统。研究了ACC水处理淬火变频自动化控制系统,提出了一个新的控制方案,达到了稳定产品质量和轧制节奏的目的,为提高中厚板厂的效益创造了有利条件。     

胎儿不同类型胼胝体发育不全的MRI诊断价值

目的:分析核磁共振成像(Magnetic resonance imaging,MRI)对胎儿不同类型胼胝体发育不全(Agenesis of corpus callosum,ACC)的诊断价值,总结诊断依据。方法:2014年7月至2017年1月筛查孕妇中74例经超声产前检查发现疑似胎儿颅内异常,于常规超声检查后3 d内行MRI检查。根据其MRI表现判断ACC发生情况,并与分娩或引产后诊断结果进行对比,计算其诊断价值并总结诊断依据。结果:所有新生儿或引产儿均获得明确诊断,58例确诊为ACC,其中完全型ACC 36例,部分型ACC 22例。MRI诊断ACC的准确率为84.48%,灵敏度、特异性分别为96.55%、75.00%。ACC的MRI图像特点为枕角不对称增大、呈"泪滴"状,以及胼胝体缺如、侧脑室前角呈牛角形。结论:MRI诊断ACC的灵敏度及特异性均较为理想,且有助于ACC分型及合并畸形的判断。     

汽车ABS/ASR/ACC集成控制系统设计

以JettaGTX轿车为样车，设计了ABS／ASR／ACC集成控制系统。集成系统采用压力源供能装置实现主动制动，并利用原车的ABS压力调节器实现各轮缸压力的独立调节；通过控制电磁离合器和步进电机进行节气门控制。集成系统控制主程序确保了ABS、ASR、ACC各子系统在资源共享的同时实现各自的功能。     

加大农业综合开发力度，确保农业经济稳步增长

邵阳县农业综合开发工作紧紧嗣绕农业增效、农民增收这一目标,不断加大农业综合开发力度,促进了农业经济持续增长.通过项目建设有效改善水利条件,提高了抵御自然灾害的能力.以农业综合开发项目区为平台,按照"三合"要求,创新开发模式,整合支农项目,实行规模开发,引领助推新农村建设.     

发动机产品研发项目管理体系探讨——玉柴国六产品开发项目管理改革实践

基于玉柴传统功能型组织架构下产品开发管理存在需求多头对接、信息传递慢、开发工作串行、内耗严重等诸多问题下,玉柴痛定思痛对标行业内多家优秀企业,开展项目体系改革,持续不断的变革求新、博采众长,构建能高效协同的项目管理体系.通过不断的实践,在国六项目开发上产品开发从职能型管理向矩阵式强项目管理模式转变,并取得一定的成效.为...     

基于智能前视摄像头的ACC目标车辆探测

针对搭载传统雷达传感器的自适应巡航控制系统(Adaptive Cruise Control,ACC)误识别率高的问题,在Mobileye图像探测功能的基础上,提出利用智能前视摄像头,进行ACC目标车辆探测研究。阐述目标车辆距离与速度的探测原理以及误差值的大小,同时介绍智能前视摄像头的硬件设计,包括图像检测设备、中央控制单元MCU以及CAN收发器和保护电路。分别在直道高速场景、弯道场景,前方有车辆切入、主目标切出这四种工况下进行ACC目标车辆探测,并从多个目标中识别出主目标,验证主目标识别的准确度和可信度。     

基于ISO 26262的电动四驱混合动力系统功能安全概念设计

叙述ISO 26262功能安全标准的基本概念,在此基础上,以电动四驱混合动力车的开发为案例,介绍ISO 26262功能安全规范的第三部分-概念阶段的设计开发。包括项目定义,危险分析和风险评估以及功能安全概念工作。     

基于组态技术的自动控制系统仿真研究

随着集散式工业控制系统的不断发展,在各种控制设备之间进行数据、命令的传输与交换的要求,促使工业控制装置的联网与通讯不断地发展。基于参与老师的一个关于金山电厂水源监测系统设计的项目研究的成果,本文简单介绍了KingView软件,详细讲述了应用"组态王6.53"的强大功能开发系统的方法,尤其详细讲述了几个重要部分的开发过程,画面制作、趋势曲线、数据报表和报警功能的具体实施方法,以及如何利用KingView软件中的仿真PLC对系统进行仿真,并给出了主要程序加以说明。将自动化技术、计算机技术、通信技术融为一体,计算精度高,性能稳定、实用性强,可以提高工作效率。     

面向项目型企业的项目管理信息系统的设计与实现

针对传统项目管理系统已经不适用项目型企业的发展需求,开发出基于Web的项目管理系统。构建系统的功能概念模型和数据库结构模型并简单介绍了系统开发和运行环境。实践运行结果表明,该系统满足及时性和跨地域性的办公信息化的需求,大大地改善了管理方式。     

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.     

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.