偏心缸筒与活塞杆同轴装配技术研究

对偏心缸筒与活塞杆同轴装配进行技术研究，异型液压缸缸筒设计带有销轴连接形式长挂板，与环状缸体组焊后组成缸筒，因不规则外置长挂板重量大于环状缸体重量，导致缸筒重心偏移，通过阶梯型定制式固定竖直装置结构实现了竖直固定配重液压缸缸筒偏心部件，使活塞杆与之同轴装配，避免因不同轴造成孔用密封装切发生液压缸内泄等质量失效问题。     

臂式挂装车工作装置液压系统试验分析

臂式挂装车的挂装工作装置要实现升降、纵移、横移、回转、俯仰、滚转六个自由度的动作,工作装置液压系统的性能直接影响这些动作的实现;通过对该液压系统的测试,获取空载和满载工况下各种动作的压力曲线,以此为依据对于挂装工作装置液压系统进行分析,并给出结果。     

客运索道弹簧组件装配设备的设计

针对当前客运索道脱挂抱索器中的弹簧组装配效率低、劳动强度高、可控性差等问题,提出了相应的解决方案,设计了脱挂抱索器弹簧组装配专用设备;该设备的筒形工装可对弹簧组进行封闭、导向和保护,液压系统可对弹簧组件施加平稳可控的压装力,控制系统可对压装力和压装位移实现准确控制。设备实现了高效准确自动的弹簧组装配作业。     

液压推削油槽

连杆铜套上有四条均布的深1毫米的油槽。以往在车床上逐条进行加工,劳动强度大,工作效率低,油槽质量差。为此,我们革新成液压推削油槽装置。缸体8固定在刀架上,活塞杆9头部铣四条槽,装四把刀头,活塞     

四轮转向挂装车液压系统的设计

该文主要介绍了四轮驱动挂装车液压系统的设计原理,简要介绍了挂装车的结构设计。该挂装车采用后轮驱动、四轮转向的方式,其工作装置可以在6个自由度上进行调整,并在驻车制动、工作装置液压系统中设置应急系统,确保挂装车的作业安全。样机的研制成功证明了该挂装车液压系统的设计是合理、适用的。     

热连轧窜辊装置改造计算及热装工艺

热连轧生产线同类窜辊装置中均存在窜辊缸活塞杆与调心头脱开的现象,通过对窜辊装置中窜辊缸活塞杆与调心头的联接方式进行改造,由螺纹联接改为过盈联接后,解决了这一问题,本文详细介绍了活塞杆与调心头过盈联接的理论计算及热装工艺.     

便携式挂装装置传动机构设计

便携式挂装装置用于将武器等被挂物从转运设备上升起,将其提升到所需的高度。其具有手动和电动模式,传动结构是重要组成部分,是挂装装置提升效率的关键。从便携式挂装装置的功能出发,对电动传动、手动传动部分及钢索排线传动部分及安全保护装置进行了设计,并提出了存在问题及改进方向。     

咬口机自动上下料控制系统设计

设计了一种咬口机自动上下料系统。以 PLC为主控制器,以触摸屏为人机界面,利用伺服电机、液压装置和交流电机等为执行机构,实现了咬口机自动上下料,从而大大提高了生产效率,减轻了劳动强度,并保证了产品质量。     

挖掘机液压缸活塞杆镀层局部漏镀原因分析

工程机械行业机械装备液压缸装备中活塞杆电镀为防护-耐磨性电镀镍/铬,该文主要介绍活塞杆在电镀过程中产生的局部漏镀缺陷,并根据工作经验从多个角度对其进行原因分析及提出相应的预防对策和解决方法,对快速排除挖掘机液压缸活塞杆镀层局部漏镀的原因具有一定的指导作用。     

大型船闸活塞杆表面检测机器人的设计及有限元分析

针对大型船闸活塞杆表面检测的恶劣环境,设计一种自动化的检测机器人.通过主体电推杆来实现沿着活塞杆表面的攀爬动作;通过磁力吸附步进装置,实现对活塞杆表面的吸附、松弛;通过直流编码电机控制检测装置位于活塞杆表面的不同方位,从而获取活塞杆表面二维信息图.有限元分析结果表明:磁力步进吸附装置能够实现对活塞杆表面的吸附,检测装置...     

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.