会展信息

一、机电零件 1、铸件、锻件、冲压件、粉末冶金件,标准件、紧固件、弹簧、链、链轮、齿轮、轴、曲轴、连杆、轴套、轴承、轴瓦、传动带,气动元件、液压件、密封件、电动工具零配件 2、各类电子元器件、接插件、电路板、集成块、线圈、电感、各类传感器、继电器     

电子万能材料试验机

电子万能材料试验机主要适合于橡胶、轮胎、胶管、胶带、鞋底、塑料、薄膜、压克力、FRP、ABS、EVA、PU、铝塑管、复合材料、防水材料、纤维、纺织、电线电缆、纸张、金属箔、带、丝线、弹簧、木材、医药包装材料、胶带等进行拉伸、压缩、撕裂、剥离等力学性能的测试、分析。     

企业名录

主要经营品种及范围:泵、减速机、风机、压缩机、输送设备、起重设备、建筑机械、机床、电动机、发动机、锅炉、电焊机、等离子切割机及以上机械设备配、附件。传动带、传动链、皮带轮、链轮、齿轮、蜗轮、蜗杆,联轴器、轴承、轴承座、轴瓦。紧定衬套、锁紧螺母、锁紧垫圈等。制动器,管、阀门、法兰、水表、管接,机械密封、橡胶密封、羊毛毡密封、石棉密封、油墨、铅粉等。润滑用具及装置、润滑油,化工反应釜,紧固件,有色金属,板、棒、保湿材料、     

书讯

代码专辑名称专辑光盘学科范围M－A理工辑A（数理科学）半年刊数学、力学、物理、生物、天文、地理、测绘、资源、气象、水文、海洋、地质、地球物理学M－B理工辑B（化学化工能源与材料）半年刊化学、化工、矿冶、石油、天然气、金属及金属工艺、煤炭、轻工、劳动保护、环境、材料M－C理工辑C（工业技术）半年刊工业通用技术及设备、机械、仪表、航空、航天、交通运输、水利工程、农业工程、建筑、动力、原子能技术、电工技术M－D农业辑半年刊农业基础科学、农艺学、植保、农作物、园艺、林业、畜牧、动物医学、狩猎、蚕蜂、水产、渔业…     

CCMT2018刀具量具量仪展前综述

正本届CCMT有来自境内外的230多家企业将展出工量具产品,主要境内展商包括株洲钻石、成都工具所、上海工具、哈量、成量、厦门金鹭、郑州钻石、恒锋工具、苏州阿诺、上海山田、大连远东、森泰英格、株洲华锐、苏州锑玛、无锡方寸、欧科亿、成都成林、澳克泰、广陆、青量、桂量、上量、深圳中图等;境外展商包括伊斯卡、瓦尔特、三菱综合材料、欧士机、玛帕、埃莫克法兰肯、泰珂洛、多马工具、雄克、翰默、申克、卡尔蔡司、京瓷、柯尔柏     

我国紧固件产品质量状况综述

紧固件是一种公认的量大面广的通用基础件，包括螺栓、螺钉、螺柱、螺母、自攻螺钉、木螺钉、垫圈、挡圈、销、铆钉、连接副和组合件及其他12大类，广泛用于机床、通用机械、汽车、拖拉机、农业机械、工程机械、电力工程、发电及输变电设备、石油化工、桥梁、轨道车辆、军用车辆、冶金机械、重型、矿     

军队院校科技信息

袁氏话屏用途:适用于办公自动化、企业管理、公共公益信息服务、监视、调度及通信指挥等方面。也适用于各级政府、军事部门、公安、邮电、管理、旅游业、商业、金融、海关、电力、采矿、石油、化工、铁路、机场、车站、码头、医院、学校、图书馆和各种咨     

书讯

本书全面、系统地介绍了胶粘剂和密封剂在合成与生产中以及在粘接实践中所用的各种原材料,如树脂、橡胶、单体、乳液、溶剂、固化剂、交联剂、催化剂、促进剂、增韧剂、增塑剂、稀释剂、增稠剂、乳化剂、引发剂、偶联剂、阻燃剂、填充剂、防腐剂、消泡剂、发泡剂、软化剂、光敏剂等20几个类     

读者来信

MM《机电信息》编辑部: 您好!我公司专业生产、销售冷饮、速冻食品设备及其配套设备。对贵刊以下几种产品感兴趣,请您帮助提供资料: 变频器、传感器、电动机、继电器、指示灯、低压元器件、PLC、开关、空气干燥器、活塞式空压机、罗茨风机、制冷设备、阀、气动产品、气缸、软管及接头、摆线、齿轮、蜗轮蜗杆、密封产品、垫圈、风机、流量计、物位计、轴承、齿轮、轴、弹簧、喷涂、热处理、砂磨、抛光设备等。 谢谢!     

《仪表工业》第二届编辑委员会人员名单

顾问 王良檐朱良漪主任 马少梅副主任 苗隽咎福祥委员(按姓名笔划排列) 万鸿定马林 王宏成王国强 尹翼开史天保 江红生江海标 沈忠康陈令 周鹏飞胡士凌 侯尔志姜继增 黄缉熙藏公玉徐文海郭志坚杯饮脚分尹l诀刁不作r王永健王治化刘铁推李万玲陈耕燕赵大伟秦起佑王岐山王善元庄松林吴钦炜季欧赵安东徐岱润了.、厂、犷、犷、了、犷、了、,.,、,..、沙.、了、了、厂、了、犷、了、了、了、犷、了、了、厂、了、了、犷、厂飞了、了、了、厂、:*'..'犷、-*'、扩气︸了..'了..':'飞犷、了、犷、犷、厂、了、犷、了、厂、挤、;:-..、..'、..'、..'…     

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.     

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....     

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.