抗干扰的16位LED显示模块软硬件设计

介绍用单片机89C2051和数字电路等设计的16位LED显示模块。仪表通过串行口与显示模块进行数据更新，不影响仪表与PC机的通讯功能。该模块具有较强的抗干扰能力。     

钻井液泥浆参数监测系统的研究

通过单片机控制超声波的发射和接收,测量已知参数超声波的衰减值。然后通过计算机计算出当前位置钻井液泥浆的实时密度,间接计算泥浆的黏度,同时测量当前测量点泥浆温度和泥浆的流速。单片机通过接口与外部显示设备相连接,将所计算和测量当前泥浆参数在显示器上实时显示出来,并进行数值记录,微机内可以列表或曲线列表将测量数值显示,实现井场固控系统智能辅助功能。     

基于CAN总线的嵌入式超声波测距仪

介绍了一种基于CAN总线的嵌入式超声波测距仪设计,在该系统中主要采用微处理器作为控制核心,运用超声波传感器及相应的放大电路组成超声波的发射与接收电路.在发送与接收超声波信号时,通过微处理器和程序计算出发送与接收超声波的时间差,再由已知的超声波传播速度,求出障碍物与超声波传感器之间的距离.同时,微处理器可以对测量的数据结果进行处理后送到LED显示器进行显示,也可以通过CAN总线将数据传送给上位机,实现远程监视和网络控制的智能化仪表功能.     

坐姿体压分布测量系统的研究

介绍了一套坐姿压力分布测量系统,该系统由硬件和软件两大部分组成,系统硬件包括压力传感器平板矩阵、信号切换电路、信号采集卡及计算机系统;系统软件主要由实时数据采集模块、数据存贮模块、数据计算分析和显示模块等组成。该系统能够对人体与座椅之间的压力分布进行测量,经计算机采集后的数据通过自行开发的软件处理直接以可视化方式显示结果。     

流量测量仪表──第十讲 超声波流量计

流量测量仪表──第十讲　超声波流量计开封流量仪表研究所邵朋诚概述利用超声波测量流速、流量的技术在医疗、海洋观测、河流特别是工业管道的各种测试中有着广泛的应用，它不但可以用于液体、液固两相流的测量，而且可用于气体流量测量。研究利用超声波测量液体和气体的...     

基于ARM的水文测量报警系统

介绍了一种基于ARM的水文测量报警系统的设计.该系统以LPC2148微处理器为控制核心,基于超声波测距原理测量系统距水面的距离;使用变频雷达传感器测量水面流速.在软件设计中使用滤波法、中值法提高超声波测距精度;编程设计控制雷达波发射频率精确的测量水面流速.系统使用LCD显示测量结果、报警值和报警状态;使用RS-232串口和嵌入式无线数据传输模块通信和数据传输;通过按键扫描调整水面距报警值,实现了系统液面距的声光报警.     

一种节省电量的超声波热量表的设计与实现

为了延长超声波热量表的使用周期,设计了一种能够自动降低功耗的超声波热量表。该设备采用智能测量频率技术,即根据检测到的流速情况调节检测频率,从而达到降低功耗,延长电池寿命的目的,此外还简单介绍了专门设计的数据采集模块、模数转换器、时钟模块和串口模块。     

基于LabVIEW的超声波坐标定位仪设计

为提供一种新型的物体平面定位方法,设计一种操作简单、工程上容易实现的坐标定位仪。将超声波测距原理应用到物体的平面定位中,利用AT89S52单片机作为核心处理器,驱动两舵机进行旋转,带动两超声波测距模块US-100进行扇形扫描,分时发射超声波信号并采集反馈信号,计算测量距离,由RS-232串行口与计算机连接通信,将测量数据传输给主计算机,利用虚拟仪器LabVIEW,实时动态显示物体的坐标方位并绘制其移动路线。结果表明:单个超声波收发装置4 500mm以内测量误差在0~17mm之间,测量盲区为23mm。整个超声波定位仪样机各项功能完成良好。     

基于MSP430超声波液位测量仪的设计及无线收发

介绍了利用MSP430F149作为主控芯片的超声波测距的基本原理,开发了具有无线收发功能的超声波测距仪表,适合复杂环境安装应用。给出了设计方法和系统框图。该系统包含脉冲发射电路、接收电路、温度补偿电路和相应的控制电路。采用nRF905无线收发芯片,实现数据的实时开路传输。实验结果表明该仪表提高了超声波测距的测量精度、可靠性高,可满足工业现场使用要求。     

基于LabVIEW的超声波相关法流速流量测量仪

讨论和分析了相关法超声波流量计的测量原理和数学模型，据此完成了相关法超声波流速流量测量虚拟仪器系统的结构设计和基于Lab-VIEW的软件设计，通过对该系统进行软件模块测试和系统信号仿真实验，论证了将虚拟仪器技术应用于超声波相关法流量测量领域的可行性，在相关法超声波流量计的理论研究和实验开发上具有一定的应用价值。     

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.     

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.