深水滑道井字梁自动化、数字化调位系统总体设计

提出了一种基于CAN(Controller Area Network)总线的自动化调位系统,通过对多个三向千斤顶协同工作的联动,实现了液压同步技术和计算机通信技术在深水滑道井字梁自动化精确调位方面的应用,解决了长期以来困扰水下工程高精度定位的难题.     

地铁隧道内钻孔设备的结构设计

针对传统隧道内刚性悬挂接触网汇流排安装施工中钻孔作业施工效率低、施工环境差以及现有钻孔设备自动化程度低的特点,设计了一种新型的隧道内钻孔装置。基于钻孔设备的工况要求,采用液压传动系统控制钻孔平台的运动,使得设备功率密度大和调速方便。定位装置的设计主要包括定位方案的设计、升降机构的设计、旋转机构的设计、调平机构的设计以及XY向运动平台的设计。通过CAD软件建立了其三维模型,并通过ANSYS Workbench软件对其结构作了优化。采用基于CCD智能相机的光学定位和人工控制定位相辅相成的定位方案,使该钻孔设备具有较高的自动化程度和可靠性。最终开发出了具有较强实用性的隧道内钻孔设备。     

基于液压伺服和虚拟仪器技术的脉冲试验机设计

针对现有液压脉冲试验机自动化程度低、测试精度差等不足,设计出基于液压伺服和虚拟仪器技术的脉冲试验机。采用液压伺服系统进行无级调速,由控制系统进行自动跟踪补偿,提高系统的自动化程度和控制精度。采用虚拟仪器技术开发测试系统的软件和硬件部分,提高该试验机的测试精度和效率。最后给出了基于虚拟仪器软件LabVIEW进行试验及记录的结果,验证了该试验机能够满足冷却器疲劳性能测试的各项指标要求。     

液压顶推整体平移施工技术在设备安装领域的应用

文章介绍了液压顶推整体平移施工技术在大型设备安装时的具体应用。该技术取代了传统的起重吊装,开创了大型设备安装整体平移施工的新途径。在水泥厂新型辊压机安装施工中,首次使用了液压顶推整体平移技术,成功地将大型设备辊压机整体平移就位,缩短了工期,确保了工程质量,提高了施工安全性,降低了施工成本。     

液压系统安装调试技术综述

工业设备液压系统发展至今，已经向高科技方向发展，当今的液压系统技术更加先进，控制精度更高，是现代工业设备主要动力源及控制源。宝钢三期冷轧液压系统，采用当今世界的先进技术，其系统复杂，控制精度高，对设备的使用要求也很高。本文对液压系统的安装调试技术作简要的综述。一、液压系统安装阶段1、液压元件的安装液压设备在安装就位之前，设备基础及其周围环境必须清除垃圾和积水，通风和排水设备投入使用后，方可施工，防止污染液压元件。油箱的纵横向水平度允差为lmm／m；泵水平度允差为0．lmm／m；控制阀架、蓄能器、冷却器、过…     

水下液压同步控制系统研究

结合某型UUV水下液压同步控制系统研制,分析了水下液压系统在设计上的特殊要求及解决措施,分析了同步马达同步控制误差的产生原因以及如何在设计、安装及调试过程中消除或减小同步误差。介绍了闭式水下液压系统的注油及排气方法;对同步控制系统进行了均载及偏载同步测试,分析了偏载、温度及油液黏度对同步精度的影响。     

一种剥离设备

阴极剥片机组属于铜精炼的自动化专用设备,论文介绍的阴极剥片机组主要用于剥离电积和电解过程中沉积在不锈钢阴极板两面的阴极铜.重点介绍了剥片技术、两自由度极板转移技术、三段喷淋可调向洗涤技术.该设备具有结构紧凑,运行速度快,能耗低、不损伤阴极板等优点.     

一种应用于液压提升设备的智能监测系统

利用多种智能传感器感知结构变化,构建分布式通信网络,通过云服务技术和编制智能控制策略,实现液压提升设备智能监测系统施工过程的全自动化控制、数据智能记录与管理、云服务远程监管等功能.基于智能监测系统的应用,提高了液压提升设备施工精度和效率,同时也提升了施工品质和安全性.     

进口工业设备液压润滑系统管道的安装

重点介绍了进口大型冶金、加工设备的液压润滑系统管路安装时，如何与国内技术标准，施工方法打结合以达到设备所要求的精度以及施工时应注意的问题。     

基于全向轮驱动的重型设备转运安装平台设计

针对柴油发电动机组、降湿机组等重型设备转运安装受场地条件限制,不适宜起重吊装设备使用的现状,设计了基于全向轮驱动的重型设备转运安装平台,研究确定了液压泵站、油缸、行走机构、全向轮、调整装置、升降装置及卡具的规格型号、连接方式、安装形式等,同时完成了结构设计计算。该平台可实现重型设备在狭小空间条件下的快速装载、转运、就位及找平找正,提高设备转运安装自动化程度,降低安全隐患,提高施工效率。     

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.