一种风电设备发电机底座组对焊接工装的设计与应用

本文介绍了一种风电设备发电机底座组对焊接工装的设计与应用情况。首先介绍了设计原理;其次介绍了基本结构,具体的制作方法;最后介绍了具体实施方法及应用前景等。     

基于比例阀和伺服阀的恒减速液压站的研究

本文分介绍了液压制动系统在煤矿上的应用情况,对二级制动时减速度进行了简单的分析,并介绍了二级制动和恒减速制动的工作原理和它们的区别。简要介绍了电液比例阀和伺服阀各自的原理和区别。针对E141A液压站介绍了恒减速液压站的基本组成和主要作用,然后简要介绍了该液压站在工作制动时的电气控制原理和液压原理。最后主要介绍了安全制动的工作过程,并介绍了他的电气和液压系统的控制原理。     

西门子810数控系统维修实例

本文简单介绍了西门子810系统的基本构成，详细介绍了一些影响数控系统正常工作的原因，并且介绍了诊断这些故障的一些方法和实际经验。其中第一部分介绍了两例由于机床为数控系统供电的电源出现问题而影响系统的正常工作的故障处理过程，第二部分介绍了7例引起系统死机故障的处理过程，第三部分介绍了系统出现的11号报警和22号报警的处理过程。     

恶臭污染及其治理技术

本文介绍了恶臭的来源及危害,并介绍了恶臭的治理技术、重点介绍了亚臭生物汉理技术的发展及应用。     

国产首条绿色环保型自动镀锌生产线介绍及WP321称重模块的应用

本文首先介绍了国内热镀锌行业的现状,其次介绍了欧洲热镀锌业的现状及发展,然后介绍了绿色环保型自动生产线的组成模块及WP321称重模块在其中的应用,最后介绍了自动生产线技术的实现工艺。     

IC卡计费水表的设计

本文介绍了一种ＩＣ卡计费水表的设计方法,重点介绍了水表的硬件与软件结构,并结合实际,介绍了水表的应用。     

悬臂式张力传感器的应用介绍

本文主要介绍了一种悬臂式张力传感器,介绍了该种传感器的设计注意要点和安装使用的注意事项,并对张力的计算公式进行了介绍。     

第五届国际电子测试与测量专业研讨会

在2005年秋季（第66届）全国电子产品展览会期间。主办单位在上海新国际博览中心举办了电子测试与测量专业研讨会。会上，中国工程院院士张钟华先生介绍了“‘十一五’电子测试与测量技术的发展”、美国吉时利公司介绍了“半导体器件特性测试的新技术”、日本横河公司介绍了“高性能便捷的电子元件测试技术”、美国NI公司介绍了“高效、模块化的消费电子测试解决方案”、凌华集团介绍了“PXI系统于各式量测应用开发环境中的实际案例”、北京航天测控公司介绍了“故障诊断技术研究与应用”、赛宝实验室介绍了“电磁兼容测试仪器的计量校准”、南京长盛公司介绍了“电子设备（电器设备）的防触电措施和安全测试（试验）”等。     

零件精度检测技巧实践

汽车是由无数的精巧零件组成的,所以零件的质量会直接影响到汽车的质量,进而要想保证汽车的质量,首先就要保证零件的质量。而决定零件质量的最主要的因素之一的就是零件的精度。本文就主要对零件精度的检测技术进行了介绍,首先介绍了计算机视觉和图像处理技术,汽车零件的计算机视觉检测技术进行了介绍,基于CAD的计算机视觉检测技术进行了介绍,基于CAD的计算机视觉检测技术存在的问题进行了介绍,优化基于CAD的计算机视觉检测技术的措施进行了介绍,最后对计算机视觉检测技术展望进行了介绍并进行了总结。     

直线电机在精密加工中的应用

介绍了直线电机的特点及工作特性，并针对永磁动圈式直线电机介绍了其性能测试与控制方法。最后介绍了直线电机的精密磨削加工中的应用实例。     

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。     

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....     

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.