CBM系统与设备状态监测

本文从设备维修需求与技术出发,给出了目前装备维修的主要方式及其优缺点,分析了当前基于状态的维修(CBM)研究与应用现状,提出了基于状态的维修分析决策系统框架,给出了CBM适用的条件和分析流程,探讨了预先维修、CBM与以可靠性为中心的维修(RCM)的融合.结合某设备中一齿轮箱的状态检测信息,给出了基于声音的设备状态监测案例.     

从机构零件磨损特性谈设备维修制

从设备故障发生规律和零件磨损规律分析传统的设备维修制的不足,通过对设备维修相关问题的分析得出如下结论(1)机械维修应以计划预防维修制为基础;(2)深入研究设备诊断手段,以补充和完善计划预防维修制;(3)加强对设备故障规律的宏观研究,逐步建立以可靠性为中心的设备维修制;(4)不论采用何种设备维修制,设备的精心保养都是重要的.     

基于PDCA循环持续改进的企业设备精益化维修

随着设备复杂化、精密化的发展,设备的维修方式进入到以可靠性为基础的精益维修阶段.通过对PDCA(Plan、Do、Check、Action)循环和设备精益维修理论的综合考虑,研究了如何利用PDCA循环对设备的精益维修进行持续不断的改进,并将利用PDCA循环改进的设备精益维修理论与传统的维修理论进行对比,总结了该模型在设备寿命周期、寿命周期费用(LCC)及产品质量等各方面的优点,使得现代化设备的精益化维修过程得到了良好的改进.     

基于IETM的航空装备虚拟维修训练的研究

虚拟维修是利用虚拟现实技术构建虚拟维修环境并进行装备的维修操作仿真,并越来越多的应用于IETM系统中。本文提出了虚拟训练手册编辑软件VPE和VTE在IETM中的虚拟维修训练的编制和应用方法,使维修训练程序可视化,具有简单的操作性、强大的交互功能,大大简化和降低了交互式虚拟训练的三维制作过程和技术难度。     

船舶设备维修性与维修费用相关分析

从船舶设备维修费用的基本组成来论述船舶设备维修性与维修费用之间的定性关系.主要论述了维修材料费用、备品备件费用、保障设备费用、维修设施费用、维修人员工资费用等与维修性的关系.     

数控机床IETM系统中异构数据集成技术研究

交互式电子技术手册(IETM)是当前信息化领域研究的一个热点,通过电子显示系统向操作维护人员提供一个与操作维修过程相融合的、多格式的、人机交互的技术信息查询和维护环境.根据IETM研究和开发的需要,分析了IETM的技术数据,探讨了技术数据的XML描述,阐述了利用XML技术集成异构数据的方法,并设计了数控机床IETM系统的结构,有效地实现了IETM技术数据的数据库管理.     

构建RCM与CMMS的集成系统

在分析以可靠性为中心的维修(RCM)实施过程的基础上,将RCM与计算机维修管理系统(CMMS)密切结合.构建了RCM-CMMS综合模型,建立了RCM-CMMS集成系统.该集成系统可以将RCM分析过程与系统设计情况、当前和历史运行状况、维修状况等信息密切结合,可以根据设备运行状况动态地改变维修策略,因而增强了维修决策的适应性.     

数控电火花机床IETM设计方法研究

数控电火花机床维修的快速与准确对于延长数控电火花机床的使用寿命、保证其可靠性、保证学生实训的效率起到非常重要的作用,而交互式电子技术手册(IETM)是指导维修、方便培训、提高学生实训水平的重要保障资源.本文以欧洲标准S1000D为基础,研究数控电火花机床IETM的设计方法,并应用标准化、互操作性、模块化的方法设计了数控电火花机床的IETM.     

交互式电子技术手册在工程装备上的应用

1.基本原理和用途(1)基本原理IETM是运用计算机技术、网络技术以及数据库技术,将内容丰富的操作手册、维修手册等技术信息以数字形式存储起来,采用文字、表格、图像、音频和视频等形式,通过人机交互方式提供有关工程装备的基本原理、操作使用和维修等内容的电子技术出版物。IETM使用自动生成技术,可根据使用者的需求,从分布式存储的技术信息数据库中自动提取所需信息,生成、管理、发布和修订技术解决方案。同时可利用交互显示功能,以最优的解决方案     

发挥服务功能 深化维修市场管理

上海市是国家三委局六个设备维修市场管理试点城市之一.本文回顾了4年来上海市设备维修市场试点工作取得的成绩;提出进口设备的修理是维修市场面临的重要课题,介绍了上海市维修办拟重点抓好的有关建立设备维修热线、组织进口设备维修及配件消化吸收社会化大协作等工作情况.     

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。     

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.     

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....     

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.