深孔直线度检测装置的设计及应用

提出用臂杆法测量深孔直线度.设计出深孔直线度检测装置的结构,并进行了系统误差分析.经实测深孔油缸直线度,测量数据表明该深孔直线度测量系统能满足测量要求,对深孔零件直线度现场检测具有一定的实际意义.     

深孔直线度检测装置的设计及应用

提出用臂杆法测量深孔直线度。设计出深孔直线度检测装置的结构,并进行了系统误差分析。经实测深孔油缸直线度,表明该深孔直线度测量系统能满足测量要求,对深孔工件直线度现场检测具有一定的实际意义。     

基于PSD的深孔轴线度测量机器人设计

针对目前深孔轴线度测试技术的不足,设计了一种基于PSD的自定心深孔轴线度测量机器人。通过螺旋管道机器人驱动,带动内径自定心装置沿管道轴线前进,置于定心轴端的激光头发出激光束并照射到外置的四象限PSD面板,通过电路转换和数据采集实时显示当前管道位置的轴线位置,并完成所测深孔轴线的测量。与现有测量系统相比,该机器人可以实现精密仪器中深孔、盲孔任意截面直线度参数的测量。     

基于光轴法的深孔直线度测量装置设计

针对深孔直线度检测装置存在的环境适应性差、操作复杂以及直线度评定方法计算时间长等问题,提出了一种基于光轴法测量深孔直线度的方法,设计了以光电自准直仪为测量基础的深孔直线度测量装置。装置由反射镜、光电自准直仪、激光测距传感器组成的测量单元,与测量单元配合的高精度的自定心单元以及精密的行走单元组成。采用最小区域法与最小二乘法相结合的一种直线度评定算法更好地完成了深孔直线度测量,提高了深孔直线度测量的环境适应性,实现了深孔直线度的自动检测。     

深孔直线度检测系统设计与测算

深孔直线度的准确检测是深孔加工行业亟待解决的难题。为解决该难题,设计了一套深孔直线度检测系统,对不同深孔截面边界上多个点的坐标利用阻尼牛顿法求解深孔截面圆心,得出被测工件的实际轴线,最后通过"两端点连线法"计算出深孔直线度。为深孔直线度检测提供了一套检测系统与测算方案,该系统有利于提高测量精度与效率+;是深孔直线度检测的一个创新。     

精密深孔直线度测量技术的现状与发展

对国内外各种深孔直线度测量方法及装置，深孔直线度评定方法的原理和特点进行了分析对比，并对精密深孔直线度测量技术存在的问题和未来的发展趋势进行了综合评述。     

基于三点法检测深孔直线度的测量系统

介绍了一种应用三点定圆原理测量深孔直线度的测量系统;随着测量杆的移动,通过传感嚣可获得被测孔的直线度误差数据,经数字信号处理,即对深孔的直线度误差做出评价.分析了测量误差对测量值的影响,验证了测量系统的精确性;并阐述了使用该系统可检测深孔直线度、圆柱度等形状误差值的多功能性.     

深孔综合参数测试装置设计及测试方法研究

针对目前深孔测试技术的不足,设计了一种基于激光测距的深孔综合参数测量装置,给出了测试方法,并基于最小二乘原理建立了测试数学模型。与现有测量系统比较,该装置可以实现精密仪器中深孔、盲孔的任意截面直径和直线度等孔径参数的测量。     

基于相对比较测量法的深孔直线度测量系统

在分析国内外直线度测量方法和相对比较测量法原理的基础上,设计出了基于相对比较测量法的深孔直线度测量系统,对于解决深孔零件加工中的直线度检测具有实际意义。     

深孔直线度的测量装置设计及其算法

深孔直线度是深孔零部件质量的重要指标,由于深孔的自身特点目前尚无高精度高效率的测量手段。为此提出了一种利用超声波与反转法原理测算深孔直线度的理论及相关计算方法,设计了相应的测量装置。通过所设计的装置进行深孔直线度的测量及数据处理,实验证明该装置能满足测量要求,且效率高,具有一定的工程应用价值。     

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.