基于PC的电动机机械特性自动测试系统

为实现电动机机械特性的自动化测试,提出了一种电动机机械特性自动测试方法,采用能提供均匀、稳定负载的磁粉制动器与可高速、高精采样的转矩转速传感器,搭建了系统硬件平台,利用Visual C++编写了配套测试软件,从而组成了基于PC的电动机机械特性自动测试系统,并以直流电动机为例给出了测试结果。试验结果表明,该系统可实现对电动机机械特性的高效、精确测试。     

计算机自动测试系统的应用

该文简述了计算机自动测试系统的特点,介绍了计算机自动测试系统的组成方式,以热处理炉炉温均匀性自动测试系统为例,详细分析了热处理炉炉温均匀性自动测试系统的系统结构以及工作原理。介绍了计算机自动测试系统数据处理过程、接口总线的应答方式,分析了热处理炉炉温均匀性自动测试系统采用RS232C通信方式的实现过程。     

摩擦试验机计算机测试系统的设计与应用

摩擦试验机用于试验磨阻材料的摩擦性能,基于MM-1000型摩擦试验机,本文设计了测试C/C复合材料机械摩损性能的自动测试系统。利用变频器控制电动机自动升速和降速,采用组态软件和VC编程对测试过程进行动态监视和管理,实现自动连续测试。结果表明实际应用效果良好。     

自动测试系统软件开发模式研究

软件是自动测试系统的关键组成部分,对于综合性自动测试系统的研制而言,所采用的软件开发模式将直接影响到系统各方面的性能和功能的实现。该文对目前常用的测试软件开发模式进行分析,主要介绍了各开发模式软件设计思想,总结了它们的优缺点,使得自动测试系统软件开发人员能够以此为参考,合理、快速地组建自动测试系统软件框架。     

嵌入式PLC系统自动测试中数字滤波算法研究

嵌入式PLC系统自动测试是对嵌入式PLC系统进行全面的功能、性能测试,以保证嵌入式PLC系统的可靠性。数字滤波算法决定了自动测试系统的速度和精度,是自动测试中信号采集最重要的部分。在介绍了嵌入式PLC系统整体架构以及自动测试系统组成后,分析了现有滤波算法的优缺点,在此基础上结合嵌入式PLC系统的测试要求,修改与改进了一种滤波算法,为测试提供了精确、高效的数据来源。     

某型编码卡自动测试系统的设计

本文基于LabVIEW和VXI总线设计了莱型编码卡的自动测试系统.在人工干预较少的情况下,该自动测试系统可以软件生成测试所需的各种数字激励信号,并将被测编码卡的数字输出信号读到计算机与理想数据进行对比,然后评判测试结果是否满足相应的要求.该自动测试系统实现了编码卡的自动测试、检验和分析,大大提高了相关产品检测的效率和可靠性.     

变压器自动测试系统的设计与实现

针对变压器的测试方法和标准进行了调查,并对使用单位原有的测试系统进行了设备概况分析,在充分考虑先进性、实用性、可靠性以及经济效益的基础上,设计了变压器自动测试方案,并完成了变压器自动测试系统的运行调试。     

自动测试技术发展综述

随着高新技术的广泛应用,电子系统在机电设备中所占的比重越来越大,已成为机电设备的重要组成部分.因此加强通用设备电子系统技术保障,对提高设备效能有重要作用.描述了自动测试技术的基本概念、系统构成,总结了自动测试系统的发展概况,分析了自动测试系统的发展趋势,论述了新一代自动测试系统的关键技术.     

基于Chroma8000自动测试系统的测试技术浅析

介绍了自动测试系统的发展趋势,以及ATS开发平台Chroma8000系统的特点。阐述了OBCM的关键电气性能指标和测试方法。使用指数平均和移动平均的数据采集方法创建了基于Chroma8000的OBCM自动测试系统,解决了自动测试系统测试效率低、量测误差大的问题。工厂端大批量产品的测试结果证明,该系统是一个可实际使用的精确高效的自动测试系统。     

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.     

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.     

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....     

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。     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.