数字图像处理原理在光刻自动对准技术中的应用

本文介绍一种用于DSW投影光刻机的电视扫描同轴对准装置及数字信号处理方法。装置采用电视摄象机作为图像信息传感器,模拟量积分压缩数字量,微处理机精确计算硅片和模版的偏移量并控制工作台作微小调整。该装置已具有刻出1.2μ宽线条所需的±0.3μ对准精度。     

新型JC-50D自动送钻绞车的设计与计算

重点介绍了新型JC-50D自动送钻绞车的设计方案、结构性能特点和主要技术参数。该绞车采用两台800kW直流电机驱动,配备了自动送钻装置、PSZ75B液压盘式刹车、换档机构、润滑系统、绞车气管道及DSW70水冷电磁涡流刹车等主要部件。该绞车具有整体结构紧凑、效率高、能耗低、刚性好、性价比高、易于安装和运输等优点。     

应用H型驱动结构设备精度检验项目分析与研究

本文通过对应用H型驱动结构设备的几何精度检验项目进行分析和分类研究,阐述了应用H型驱动结构典型设备几何精度对设备工作精度的影响,提出了提高此类结构设备几何精度的设计制造方法。希望可以为此类设备制造精度的进步和提高提供有价值的参考。     

基于卡尔曼滤波的微压电陀螺的误差补偿

卡尔曼滤波是提高陀螺精度的重要手段。陀螺原始信号中常常含有大量随机误差,这使得陀螺的精度大大降低。研究了适用于陀螺精度的滤波方法,探讨了基于卡尔曼滤波的方法在提高陀螺精度上的应用,并通过分析验证了所研究的算法的有效性和适用性。     

一体化智能型固体内耗仪的机械系统精度分析与提高

通过对MRS-2型一体化智能型固体内耗仪机械系统中倒扭摆的精度分析,从理论上揭示了固体内耗仪诸多系统中机械系统是内耗测量中的根本和核心所在,其精度是决定整个内耗仪内耗测量精度的关键,同时提出了应用激光二维扫描传感器实时检测与提高内耗仪机械系统精度的方法,填补了该领域的研究空白,具有一定的工程应用价值。     

应用精度诊断排除机床传动精度误差

金属切削机床的精度诊断是近年来出现的一门新兴科学,把精度诊断应用到设备维修方面在国外一些发达国家已相当普遍,在我国尚属初始阶段。本文通过应用精度诊断排除机床传动精度误差这一实例,论述了开展金属切削机床精度诊断应用的重要性。     

金属管浮子流量计的测量精度与保证措施

本文介绍了浮子流量计精度的定义方法,在选用该系列产品时有关精度方面的注意事项和在应用该产品时如何实现相应的测量精度.     

嵌入式计算机辅助圆柱齿轮精度设计系统研究

为实现齿轮精度设计的自动化和智能化,基于嵌入式技术开发了计算机辅助齿轮精度设计系统,给出了嵌入式计算机辅助圆柱齿轮精度设计系统的总体框架,研究了齿轮精度设计中的关键技术和嵌入式计算机辅助齿轮精度设计系统的实现技术。实例验证结果表明:所开发的系统具有操作简单、能快速准确地进行齿轮的精度设计。该系统的研究为齿轮设计的自动化和智能化创造了条件,具有较好的工程应用价值。     

多关节三坐标控制车身焊接精度

影响车身装焊精度的因素有很多,其中焊接夹具的稳定性是最重要的因素,因而夹具精度测量是保证焊接夹具使用稳定性的最主要途径.近年来,多关节三坐标的应用大大提高了夹具精度测量的效率和准确度,成为维护夹具精度,改善车身几何精度的重要手段。     

基于卧式加工中心结构特点提高其加工精度的方法研究

综合分析了卧式加工中心各直线轴定位精度和重复定位精度、工作台角度定位精度和重复定位精度、两轴联动插补铣圆精度和调头镗孔精度,应用数控补偿技术,提高卧式加工中心加工精度。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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.     

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....