含混合间隙的登机桥动力学分析

以机场旅客登机桥为研究对象,针对该系统建立多体系统运动学模型,对登机桥转动运动副和移动运动副的间歇进行力学分析,得出含混合间隙的登机桥动力学运动方程,对某型号登机桥的二种工况进行计算.上述工作对研发新一代登机桥有指导意义.     

浅析登机桥发展现状及机电桥升降驱动下置的研发

随着登机桥市场的竞争已不断加剧,国际主要企业将产品设计、技术研发创新作为其核心竞争力,以不断创新来拓展巩固企业在市场上的地位,如新型TeleRadial登机桥、无障碍式登机桥等。分析了登机桥发展的现状,介绍了新机电桥升降驱动系统的研制情况。     

液压登机桥升降系统调节与维护

旅客登机桥是现代机场的主要设备之一,其控制系统的正常工作是登机桥稳定运行的重要保障。为了保证登机桥升降系统能正常、可靠的工作,本文基于蒂森登机桥,对其液压升降系统控制原理和各阀的功能进行探讨,并且详细介绍了液压控制系统的调节与维护。     

登机桥接机口安全保护探讨及辅助制动装置的研制

接机口安全保护是欧洲登机桥标准和即将出台中国登机桥标准新提出的要求,它对防控接机口发生溜车,确保登机桥安全运行有着非常重要作用。通过对相关资料的调查,对各种制动方案进行了探讨、研究,针对登机桥运行特点,开发了独特的无源液压辅助制动装置。     

登机桥结构的参数化有限元分析系统设计

研究了基于ANSYS的登机桥结构参数化有限元分析系统。该系统根据登机桥结构系列化的特点,利用APDL语言的参数化特性,实现了登机桥建模、载荷施加与求解的参数化有限元分析全过程。这样对不同型号的登机桥进行有限元分析时,能够避免大量的建模、划分网格、加载等重复性工作。     

集装箱运输的登机桥模块化设计

模块化设计可将登机桥各部分分解为一个个较小的标准模块,以装入集装箱运输,节省运输成本,提高生产效率。主要探讨登机桥的模块化设计方案,并与当前的登机桥进行了成本比较分析,对运输线路较远的项目具有明显的优势。     

基于流固耦合的辅助登机设备抗风性分析

辅助登机设备是为应对航空运输过程中某些起降机场缺乏地面登机梯而设计的,其在使用过程中会承受风力载荷。通过对相关规范标准的研究,联立ANSYS Workbench的流体动力学分析模块和瞬态动力学分析模块对辅助登机设备进行了基于流固耦合的抗风性仿真分析。分析结果表明:在规定级别风速作用下辅助登机设备的变形量很小,且整机结构满足强度要求。     

登机桥行走机构的安全防护装置设计探讨

处于高度重视安全的社会,行走机构的防护已开始成为登机桥的必备装置,文中概括介绍了几种实用、新颖的防护装置,并提出了将超声波传感器、视频技术应用于登机桥行走的安全防护方案,可为今后登机桥行走机构的安全防护设计提供参考。     

基于C51单片机的行车用语音联系盒的设计

介绍了用于行车的人员登机联系的语音信号装置.采用AT89S51系列单片机为核心控制器,实现语音提醒司机人员登机、离机过程;可根据用户需要增加区分登机、离机过程的功能,并有防止误报及可靠闭锁大车的功能.     

WS—750T型登机桥的改进

针对登机桥电器及液压件出现的故障,了ＷＳ－７５０Ｔ型登机桥的改造原理及实践中应用的经验。     

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.