振动时效新工艺的研究及应用

本文简述了振动时效（ＶＳＲ）的机理，介绍了振动时效的处理过程。结合钢套的具体应用，证明了振动时效的处理效果。最后，通过总结振动时效的特点对这一新工艺的推广应用提出了几点看法     

振动时效新工艺的研究及应用

本文简述了振动时效（ＶＳＲ）的机理，介绍了振动时效的处理过程。结合钢套的具体应用，证明了振动时效的处理效果。最后，通过总结振动时效的特点对这一新工艺的推广应用提出了几点看法。     

振动时效技术在工程机械上的应用

介绍了振动时效技术在挖掘机工程机械上的应用，包括振动时效技术、设备、工艺、工艺效果、工艺管理和经济效益，对振动时效技术的推广应用有抛砖引玉的作用。     

振动时效过程中动态参数变化规律的理论研究

本文简要介绍了振动时效的机理，建立了振动时效的力学模型，应用振动理论分析了振动时效处理过程中各个动态参数的变化规律，从而对振动时效处理效果判据在理论上作出了解释。     

振劝时效技术机理

为配合国家经贸委技术进步与装备司推广应用《振动时效技术》，从本期开始，我们将陆续刊登有关此项技术的以下内容：振动时效技术机理；振动时效技术标准制修订动态；振动时效技术的应用与验证；振动时效技术在企业实际应用中所获得经济效益等。在对振动时效技术介绍的同时，本刊还将与机械科学研究院共同开展有关此项技术、设备的咨询和组织召开振动时效技术的现场演示活动，希望关心此项技术推广和应用的广大企业能够积极参加此项活动。     

振动时效在消除焊接内应力上的应用

本文以ＷＹ３２型液压挖掘机动臂为例，通过振动时效和热时效两种方式的比较，证明振动时效消除焊接内应力具有良好效果。通过试验论证了振动时效在生产中的应用，并可取代热时效。     

振动时效技术在曲柄件生产上的应用

采用振动时效技术，对铸铁件曲柄进行了振动时效处理。应用这种技术，生产效率高，经济效益显著，节能９６．４０％，降低成本９８．７６％。     

绿色制造 节能减排——访北京翔博科技有限责任公司总经理车孟刚先生

GM记者：请您介绍一下目前国内的振动时效行业的总体发展概况是怎样的？ 车孟刚：振动时效技术起源于二战以后的欧美国家，于20世纪70年代被引进我国。而国内从事振动时效设备生产的厂家大约有几十家，基本上都是采用亚共振技术。但如何提高激振器的转速，以期解决高刚性材料的找频问题，把如何合理地制订各种工件的振动工艺方案作为主要研究和突破方向，似乎进入了一个技术瓶颈。在21世纪初，一种新的振动时效技术在中国出现了，它摒弃了原有振动时效技术攻关方向，独辟蹊径，     

振动时效技术应用的社会效益和经济效益分析

振动时效技术的应用，从我国“六五”期间作为38个重点攻关项目之一，至今已经历了近半个世纪。但由于人们受旧工艺习俗的影响较深，振动时效标准又不健全，以及计划经济管理体制的束缚，振动时效技术的应用和推广可以说是不甚理想的。 改革开放以后，随着国家对环保工程的重视，国外振动时效技术设备的引进，以及企业对节约资金、能源及劳动力等的重视程度的提高，使得振动时效在技术上、设备上和标准的制修订上都有了飞跃的发展。政府、行业、企业及大专院校在这一技术领域的投资和关注，也有了前所未有的力度，从而加速了该项技术的推广…     

振动时效技术的重型机械产品生产上的应用研究

本文阐述了振动时效技术的原理，技术特性以及重型机械产品生产上对典型工件进行振动时效的应用研究。     

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.