纳米激光偏振干涉仪

本文介绍的干涉仪属于毫微米级测量仪，其分辨率为０．１ｎｍ（即０．０００１uｍ）。发展超精密加工工艺，很需要开发各种纳米级测量仪。     

双焦干涉球面微观轮廓仪

本文论述一种高分辨率的球面微观轮廓仪，仪器三部分组成：双焦透镜偏振共路干涉系统，五维球面扫描工作台及其驱动系统；共模抑制电子处理系统。可用于各种球形表面的无损精密材料。实测结果表明该仪器的纵向分辨率可达０．１ｍｍ，横向分辨率小于２μｍ。     

大面积液晶面板光刻机新型工作台设计

论述曝光面积可达３３５．６ｍｍ×３５５．６ｍｍ（４″×１４″），套刻精度为±２μｍ，接近式（０～２５μｍ）液晶面版光刻机的新型工作台设计。     

亚纳米级超精细表面微观形貌光电测量技术的现状与发展

通过对亚纳米级超精细表面微观形貌光电测量技术发展现状的介绍，着重阐述了激光差动干涉到同轴式激光表面微观测量的原理，对四种典型同轴式激光轮廓仪的特点以及影响表面微观形貌测量精度和限制测量分辨率的因素进行了分析，介绍了作者关于同轴式激光轮廓仪运用到超精加工金刚石车床上进行纳米级微观形貌在线检测的研究成果。     

可转位深孔镗刀

本文介绍一种新型深孔镗刀，用于热轧无缝管的粗镗及半精镗加工，镗孔尺寸精度可达ＩＴ９～ＩＴ１１级，表面粗糙度可达Ｒ．６．３～Ｒａ３．２μｍ，孔的直线度在０．１０～０．１５ｍｍ／ｍ，并通过切削实验，优选合适的刀片材料和几何参数，推荐合理的切削用量，应用此项研究成果加工Φ２００ｍｍ长度为３ｍ的２７ＳｉＭｎ调质钢缸筒，取得较好效果。     

超精密光学非球曲面磨削系统的研制

为磨削加工出高精度,高质量的非球曲面器件,从理论上分析影响已加工表面粗糙度,轮廓精度的各种主要因素;设计研制一套超精密非球曲面磨削系统,其工件主轴,横溜板,纵溜板及磨头主轴均采用气浮形式,工件主轴的回转精度为０．０５μｍ,磨头主轴最高转速为８００００ｒ／ｍｉｎ,其回转精度为０．１μｍ,横溜板和纵溜板的直线位移分辨率可达４．９ｎｍ,而磨头中心高微调机构可实现０．１μｍ的精确微调;用已经研制成功的这套     

宽范围原子力显微镜在超精加工中应用研究

介绍了用于分析起精加工的原子力显微镜。其垂直方向和水平方向的分辨率可达纳米级，测量范围可达140×140μm。采用探头扫描方法和双扫描工作模式，扩大了该测量方法的应用范围。给出了金刚石刀具钝圆半径与精密玻璃光栅和超精密抛光陶瓷的轮廓形貌的测量结果。     

用于超精表面分析的宽范围扫描隧道显微镜

本文描述了一种能检测超精密度表面纳米级超微观形貌的扫描隧道显微镜，该装置可测到高定向石墨表面原子图象和精密光栅，金刚石切削表面和精密磨削表面的纳米级形貌。     

滚压技术

滚压技术兰州轴承厂程俊杰，刘祝山３ＭＨ４９３０型光球机的油缸缸体，其内孔尺寸为４００＋０．１１０ｍｍ×６６０ｍｍ，要求表面粗糙度Ｒａ≤０．８μｍ。由于缸体外形尺寸比较大，给磨损严重的缸体修复带来困难。如果采用镗削、车削等进行加工，其表面粗糙度达不到要...     

工件表面粗糙度的激光散斑测量

本文介绍用激光散斑对比度测量工件表面粗糙度原理和方法。其测量范围为Ｒａ≤０． ０７２μｍ。一般 Ｒａ标准偏差为 ０． ００２μｍ，并可分辨国际中划分的各细分级粗糙度数值。本方法为非接触式测量，具有分辨率高、测速快、对外界光的干扰和振动不敏感的特点。     

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.