基于虚拟仪器的车辆振动测量分析

虚拟仪器技术是目前自动测试技术及测量系统的重要发展方向,本文介绍了虚拟仪器技术及其软件、硬件特点,利用图形化虚拟仪器编程软件LabVIEW完成了车辆平顺性测试应用程序的设计,以某车辆为研究对象进行了道路行驶测量试验,实验结果表明,测量系统可较好的完成车辆振动测量、分析.     

基于虚拟仪器的电子设备自动测试系统

给出了一种先进的基于虚拟仪器的电子设备自动测试系统，论述了系统硬件和软件的设计原理。所述系统充分利用虚拟仪器的先进技术，具有状态实时监测，在线／离线故障诊断功能，可以实现几十个点的模拟、数字混合电路的电子设备自动测试。实现起来简单方便，开发周期短，成本低，是新一代的自动测试系统。     

基于虚拟仪器技术的水泥性能自动测试系统

介绍了虚拟仪器技术及其在水泥性能自动测试系统中的应用，此系统采用主、从式虚拟仪器体系结构，下位单片机完成数据采集、转换及步进电机控制功能，通过RS232与上位机PC进行通讯。主机为PC机是系统的核心既虚拟仪器，软件系统采用VB为开发平台，为基于虚拟仪器的面向对象及数据库技术的模块化结构。     

基于虚拟仪器的控制器自动测试系统

构建了一种以LabVIEW为软件开发平台,以公司数据采集卡作为基础硬件的自动测试系统,实现对控制器输入输出端口电气性能的自动测试.文中简要介绍了现代测试技术的发展及虚拟仪器技术的概念,详细叙述了系统总体方案设计及软件实现,并以实例验证了系统的高精度性能指标,该系统具有高度开放性、自动化和实用性的特点.     

一种可视化自动测试环境中的虚拟仪器技术

本文讨论了一种通用的可视化自动测试环境中的虚拟仪器的实现技术。该环境采用面向对象设计方法设计了虚拟仪器的面板及控件;设计了虚拟仪器管理器以管理虚拟仪器数据库。本文的最后通过一个例子说明了虚拟仪器在可视化自动测试环境中的具体实现方法。     

基于虚拟仪器的汽车离合器性能测试系统开发

根据虚拟仪器理论与技术,采用PC-DAQ式虚拟仪器自动测试系统模式,进行汽车离合器总成性能测试系统的开发。介绍测控系统的组成,阐述测控软件的结构及工作原理。     

基于VXI总线的直升机驾驶仪综合自动测试系统

面向航空、航天机载设备的自动测试、故障检测与维修,应用VXI总线技术和虚拟仪器技术为某型直升机自动驾驶仪设计了综合自动测试系统。介绍了设计要求、硬件组成、软件结构和系统特点。最后说明所设计的VXI总线测试平台是一个通用型综合自动测试平台。     

虚拟风机功率自动测试系统

简单介绍了一种基于虚拟仪器技术的风机功率自动测试系统。该系统采用图形化编程软件LabVIEW编制程序，可实现对风机主轴转速及功率的同时测量，并可实现数据的自动采集、保存及处理。而且该自动测试系统信息采集与信号处理相分离，其应用范围广。     

基于PXI平台的弹上计算机自动测试系统

基于PXI平台设计了弹上计算机自动测试系统,该系统采用虚拟仪器技术,软件基于Labview7.1开发设计.该自动测试系统可实现某型导弹弹上计算机系统的自动测试、检验和分析,大大提高了产品检测的效率和可靠性.     

基于LabVIEW的状态机的实现方法和编程技巧

随着测试技术的进步和计算机的快速发展，以虚拟仪器为代表的高效的自动测试系统出现并迅速普及。LabVIEW是美国NI公司推出的一种基于G语言的虚拟仪器软件开发工具，是目前应用最广、发展最快、功能最强的图形化软件开发集成环境。     

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.