京瓷推出加工效率与寿命达原来2倍的加工工具

日本京瓷公司正在开发加工效率与寿命提高到原来产品2倍左右的钢加工工具“CA5515”与“CA5525”，定于2005年1月下旬上市。面向高可靠加工的CA5515重视耐缺损性，面向长寿命加工的CA5525重视耐摩损性，均可以降低加工时的总成本。     

新型线切割放电加工机——三菱NA系列

三菱公司生产的NA系列机床是针对高精度加工的领域而开发，从机床结构、加工电源、控制系统、驱动系统等方面都作了全面更新，并同时考虑加工精度、速度、装夹性以及节能性。     

涡轮叶片经济性研磨加工方略

在加工制造涡轮叶片时要对弯曲面进行内加工和外加工，还有些涡轮叶片部位接近性差，而且涡轮叶片材料也难于切削，     

涡轮叶片经济性研磨加工方略

在加工制造涡轮叶片时要对弯曲而进行内加工和外加工，还有此涡轮叶片部位接近性差，而且涡轮叶片材料也难于切削。     

五轴数控加工中多刀加工自由曲面的刀具选择

针对自由曲面的五轴数控加工，提出一种新的刀具选择方法，此算法可以自动地选择出最优刀具组合，每个刀具对应一个或多个特定的加工区域。多刀具组合的加工方法既可以保证加工曲面的精确性，又可以实现大刀具的高效加工。此外，还提出了种五轴教控加工时间的近似算法，通过对比用刀具组合加工时间和单个刀具加工时间，从而证明了该方法的有效性。     

系统柔度的不均匀性对加工精度的影响

本文从理论上证明了车削加工工艺系统柔度的不均匀性对加工精度的影响规律，提出了一些提高加工精度的措施和建议。     

汽车细长传动轴类零件的加工工艺

本文针对汽车细长传动轴类零件的加工，讨论了此类零件在加工工艺方案、工艺方案经济技术性、工装配置、刀具选择、设备选型及加工生产线布置等方面的共性问题，并在一个实际零件的加工中得到了应用，取得了良好的效果。     

高效、节能、短流程加工技术在有色金属加工中的应用

由于资源具有不可再生性和有限性，开发和推广高效，节能，短流程加工技术，实施可持续性发展的资源战略是十分重要的。有色金属的连铸连轧，连续铸轧是典型的高效，节能，短流程加工技术，半固态金属成形技术，复合材料加工技术等都能提高材料的利用率，达到节能，节材的目的，制定相关的政策和建立我国有色金属绿色加工的评价标准能有效地促进高效，节能，短流程加工技术在有色金属加工中的应用。     

数控加工与传统机加工工艺比较

在科学技术突飞猛进的发展背景下，加工工艺也发生了极大的改变。由传统机加工发展为数控加工标志着技术的进步及完善。本课题笔者从多方面对数控加工与传统机加工工艺进行了比较，希望以此为加工工艺的完善及发展提供一些具有价值性的参考依据。     

实验室钛合金车削加工技术

钛合金具有强度高、热强度好和抗蚀性强等优点，已广泛应用于航空、航天、航海、化工等工业重要领域。由于钛合金的特性，其切削加工性较差，属于难加工材料，通过多年钛合金加工的生产实践总结研究，探索出一些合理的车削加工刀具几何角度及切削参数选择原则及切削注意事项，为钛合金的切削加工提供有益的参考。     

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.