径向圆跳动与圆度误差同轴度误差关系的研究

本文采用统计分析的方法,研究了径向圆跳动与圆度误差同轴度误差的关系,得出了它们之间关系的统计规律,并发现存在径向圆跳动有时会小于同轴度误差的这一特殊情况。     

径向圆跳动与圆度误差同轴度误差关系的研究

本文采用统计分析的方法，研究了径向圆跳动与圆度误差同轴度误差的关系，得出它们之间关系的统计规律，并发现存在径向圆跳动有时会小于同轴度误差的这一特殊情况。     

重型卧式车床高精度主轴装配工艺研究

在主轴回转误差的基本概念中,主轴回转轴线的运动误差有径向圆跳动、端面圆跳动和倾角摆动三种基本形式。回转误差产生的原因有主轴（轴径圆度、同轴度、轴肩端面垂直度）、轴承（内圈精度、外圈精度、滚动体精度）、箱体轴承孔（轴承孔圆度、同轴度、端面垂直度）三种基本零件的误差。     

重型卧式车床高精度主轴装配工艺研究

1 概述 在主轴回转误差中,主轴回转轴线的运动误差有径向圆跳动、端面圆跳动和倾角摆动三种基本型式. 回转误差产生的原因有:主轴(轴径圆度、同轴度、轴肩端面垂直度)、轴承(内圈精度、外圈精度、滚动体精度)、箱体轴承孔(轴承孔圆度、同轴度、端面垂直度)三种基本零件的误差引起的.     

基于径向圆跳动检测的锭子弹性管组件同轴度误差分析

针对细纱锭子锭脚内上下支撑的同轴度误差检测问题,以YD61系列细纱锭子内弹性管组件为例,分析了锭子上下支撑的同轴度的检测原理,通过SDT理论建立弹性管组件公差模型,在公差矢量化模型的基础上考虑零件装配要求,以分组装配方式选择组成环,计算了弹性管组件上下支撑的径向圆跳动与同轴度误差。结果表明,当弹性管组件装配工序无轴线歪斜,上下支撑同轴度最大为0.0776 mm;径跳检测大于0.058 mm时,轴承座与弹性管存在轴线歪斜同轴度误差增大需进行校调;以径向圆跳动公差替代同轴度公差检测是合理、有效的。     

轴类零件形位误差微机综合量仪的研制

以ＭＣＳ－５１单片机为核心组成的轴类零件形位误差综合量仪，可检测轴类零件的圆度误差、轴线直线度误差、同轴度误差和径向圆跳动误差，文章介绍了综合量仪的机械结构，微机控制系统硬件和软件设计，并对测量误差来源进行了分析。     

测量跳动原则分析与应用

在盘类零件的生产过程中，为了保证工艺基准的垂直度，工艺人员往往对基准提出端面圆跳动的要求。为满足轴类零件图样上同轴度的要求，加工时习惯用径向圆跳动代替同轴度要求。实际上工艺人员都在不知不觉地使用测量跳动原则对产品进行快速经济的检测。为了保证产品质量提高工序合格率，利用这种替代方法是否准确可靠，又如何把握？是工艺人员值得共同探讨的问题。     

曲轴径向圆跳动误差的工艺试验

通过工艺试验,研究了曲轴在加工过程中产生的径向圆跳动误差,并运用工艺链理论分析法分析了误差的种类和遗传方式 .最后提出了减小曲轴主轴颈径向圆跳动误差的措施.     

曲轴径向圆跳动误差的试验研究

本文通过工艺试验,研究了曲轴在加工过程中产生的径向圆跳动误差,并运用工艺链理论分析法分析了误差的种类和遗传方式.最后提出了减小曲轴主轴颈径向圆跳动误差的措施.     

曲轴径向圆跳动误差的试验研究

本文通过工艺试验，研究了曲轴在加工过程中产生的径向圆跳动误差，并运用工艺链理论分析法分析了误差的种类和遗传方式。最后提出了减小曲轴主轴颈径向圆跳动误差的措施。     

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.