冷焊及化学密封技术在设备修理中的应用

介绍了"冷焊"及密封锁固技术较传统热焊接、热喷漆、电镀及密封锁固技术以及圆柱固持技术的不同、基本工作原理及技术特点。详细介绍了固化反应过程及反应过程中温度控制点和控制时限。列举了典型零件的"冷焊"工艺及方法、平面密封技术和圆柱固持技术的工艺、方法及注意事项。还介绍了"冷焊"及密封锁固技术的安全要求及应用范围。     

齿轮加工机床的绿色设计与制造技术

在对传统齿轮加工机床技术特征及其资源环境影响状况进行分析的基础上,总结提出齿轮加工机床的绿色设计和制造技术框架,对干式切削技术、少无切屑加工技术、数控化技术、模块化及结构优化设计技术、再制造重用等技术及策略进行详细论述分析,指出齿轮高速干式切削技术及成套装备的开发是未来绿色齿轮加工机床发展的重点领域及主要趋势。     

中药制备新技术

阐述了提取新技术中超临界流体萃取、分子蒸馏、膜分离、大孔树脂及冷冻干燥技术,对中药制剂新技术中包合技术、微型包囊技术及中药缓控释技术的特点及应用也做了说明。     

机械工业出版社期刊读者服务部推荐书目

《行业节能减排技术与能耗考核》本书共分十四章。对《中国节能技术政策大纲》;石油化工、冶金及有色金属、电力、水泥及建材、机电、纺织、轻工及造纸、农业、交通运输、建筑等行业的节能减排技术及能耗考核;商用、民用、通用节能减排技术等内容,进行了全面的、具体的、     

《新技术新工艺》杂志征稿启事

为加强学术交流,促进制造业的发展,热忱欢迎高等院校的科技工作者和企业技术人员踊跃投稿。 1．论文内容范围 机械制造与切削、高效加工工艺与装备、制造业信息化、焊接与切割技术、刀具材料及工艺装备、旋压技术、节能产品及技术、减排环保技术、热加工及表面处理技术、检测技术与设备应用、设备故障分析与诊断、设备维修改造与更新方面的新技术、新设备、新材料、新工艺。     

异型烟全自动码垛及包装流水线的研究与应用

针对目前烟草物流中心采用的人工分拣包装效率低下的问题,项目研发团队研发了一套具有良好适应性、安全高效全自动异型烟码垛及包装流水线。采用了伺服控制技术、PLC控制技术、图像识别技术、机器人技术以及人机交互技术等多项先进技术实现了全自动异型烟码垛及包装流水线系统的功能并详细论述了系统的特点、原理、控制过程及关键技术。通过现场的安装调试,全自动异型烟码垛及包装流水线运行性能良好,完成了对异形烟全自动码垛及包装流水线的要求。     

绿色铸造标准研究

在分析我国铸造行业企业推行绿色铸造必要性的基础上,重点识别铸造生产过程中的污染物产生特征及能耗、物耗关键因素,对铸件产品全生命周期进行考察,应用系统工程学方法,提出了从铸件及铸造工艺设计技术、工艺及装备技术、原辅材料应用技术、检测及控制技术、铸造生产过程的污染物末端治理技术等五个方面,进行绿色铸造标准编制的研究方案。     

微机电系统测试技术及方法

微机电系统 (MEMS)测试技术及方法是MEMS设计、仿真、制造及质量控制和评价的关键环节之一,本文对MEMS测试技术及方法所涉及的微机械量、微几何量、微材料特性以及系统综合参数与性能的测试技术及方法进行了讨论。重点介绍了光学及光电检测技术在微机电系统检测中的应用,对计算机微视觉检测技术在微机电系统检测中的应用进行了探讨。     

敏捷制造工程最佳工艺探讨

对现有快速制造设备的工作特点及应用领域进行了分析,结合应用实例探讨了敏捷制造工程最佳工艺。涉及快速成形技术、快速复制技术、快速非金属注塑模具技术、快速冷喷技术、快速石墨电极制造技术及CNC技术等。     

基于产品生命周期主线的绿色制造技术内涵及技术体系框架

以产品生命周期为主线,提出一种绿色制造的技术内涵流程。从产品生命周期过程技术层、绿色制造特征技术层、绿色制造评估及监控技术层、绿色制造支撑技术层四个层面对绿色制造的技术体系展开,建立一个较为系统的技术体系框架;其中,产品生命周期过程技术层由绿色设计技术、绿色工艺技术、绿色包装技术、绿色回收处理技术以及绿色再制造技术构成;绿色制造特征技术层从技术特征角度对产品生命周期过程技术层进行分解;绿色制造评估及监控技术层由绿色制造评估技术、绿色制造数据采集技术和绿色制造过程监控技术等构成;绿色制造支撑技术层由绿色制造数据库和知识库、绿色制造技术规范及标准、信息化支持技术等构成。上述框架可为当前我国绿色制造的研究和应用提供一种技术体系参考模型。     

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.