基于LabVIEW的数据采集、监测系统设计

介绍了虚拟仪器领域中最具有代表性的图形化编程语言LabVIEW,在此平台的基础上,对数据采集系统软硬件进行了设计,主要包括传感器的选择、数据采集卡的选用、信号调理电路、数据采集、分析及监测系统的设计。以实验台齿轮泵泵壳振动信号作为研究对象,利用拉依达法确定报警阈值,利用MATLAB与LabVIEW混合编程的形式,来实现监测系统的功能。最后,在实验室液压实验台上进行了实验,结果表明,本系统能够较好的完成数据的采集及设备状态的监测。     

基于薄膜热电偶的高速切削动态温度监测系统设计

提出了一种基于薄膜热电偶传感器的高速切削动态温度监测新方法.采用磁控溅射、光刻技术、PECVD等方法在立方氮化硼(PCBN)高速切削车刀前刀面上沉积多层薄膜,制备NiCr/NiSi薄膜热电偶传感器.详细阐述了薄膜温度传感器的制备过程,设计了高速切削温度和切削力的数据采集与监测系统.以高速数据采集卡PCI-9118为硬件,结合Tchart控件,采用VC ++编制简洁友好的人机界面来实现对高速切削温度和切削力数据的实时采集、显示与分析.试验表明,设计的数据采集和监测系统使用方便、灵活、可靠.     

海水淡化远程数据采集及监测系统的设计与应用

为满足海水淡化工程信息化管理需求,该文设计了一套远程数据采集及监测系统。系统包括数据采集端和远程监测端,数据采集端具有多通道采集、存储、显示及网络传输功能,远程监测端具有显示分析功能。将该系统应用于某海岛100 t/d海水淡化工程,运行结果表明:系统误差率小、实时性高、可靠性好,能够精确采集和传输现场数据,实时监测工程状况。     

汽轮发电机组状态监测与故障诊断系统

介绍了所研制的汽轮发电机组状态监测与故障诊断系统的结构、功能和特点,同时给出了监测与诊断子系统软件的设计思想与实现方法。系统采用了网络分布式结构,由多机共同完成数据采集、分析、监测与诊断任务,可以实时地进行数据采集与分析、状态监测、故障诊断。该系统已成功地在某电厂运行。     

基于STM32的波浪能发电装置远程监测系统

针对波浪能发电装置的监测需求,结合波浪能发电装置的工作环境,设计了一个基于STM32的波浪能发电装置远程监测系统,该监测系统包括数据采集处理模块、数据远程传输模块以及数据监控终端三部分。数据监控终端通过数据远程传输模块与数据采集处理模块建立通信,数据监控终端向数据采集处理模块发送查询信息,数据采集处理模块将监测数据按照Modbus通信协议打包,通过数据远程传输模块发送至数据监控终端。实验结果表明,该监测系统运行可靠,可以满足发电装置远程监测的需要。     

基于PowerPC的嵌入式远程数据采集与监测系统设计

介绍了一种基于32位高性能芯片PowerPC8248的嵌入式远程数据采集、监测系统的设计,以实现对大型电站设备的数据采集、监测和故障诊断;并介绍了系统整体构架、PowerPC8248的主要特性,设计了系统软、硬件结构.     

基于无线网桥的远程数据采集实时状态监测系统

基于LabVIEW虚拟仪器研发了远程数据采集实时状态监测系统,应用于骨骼服数据采集和工业现场的远程监测和故障诊断。系统采用低成本无线网桥,数据传输可靠实现400~1 000 m,稳定传输速率约2 M/s,24位A/D多通道实时同步数据采集,同步采样率最高52 kHz,动态响应110 dB.系统具有成本低、可靠性高、实时性好的特点,为工业现场远程实时监测和无线数据传送提出了一种实用方法。     

基于SMS现场数据监测系统的设计与实现

考虑到工业现场数据监测的方便和实用，该文提出了一种基于SMS的现场数据监测传输系统．该系统以C8051F320单片机为核心，用西门子手机来发送数据．测试结果表明该系统实时性好、性能可靠、实用性强．适用于数据监测点分布广．数据采集量不大的场合。     

基于虚拟仪器和DataSocket技术的机械振动远程监测系统

针对目前机械振动监测远程化的需要,应用虚拟仪器技术中的数据采集、信号处理与分析等技术以及网络通信中的DataSocket技术,设计了一机械振动网络化远程监测分析系统。实验表明：基于虚拟仪器技术的机械振动状态网络化监测分析系统不仅集数据采集、分析及显示于一体,而且利用DataSocket技术实现了网络化远程监测,解决了一般网络化远程监测系统的开发复杂的问题,同时提高了网络通信的可靠性和实时性。该项目的研究工作为远程机械振动状态监测与故障诊断提供了一种新的手段和方法。     

滚动轴承数据采集系统的设计

滚动轴承是一种重要的机械部件,它也是最易被损坏的机械零件之一。为了提高滚动轴承检测系统的稳定性和降低检测的成本,设计了一种基于Cortex-M4微处理器的滚动轴承数据采集系统。通过振动分析法来对轴承进行有效监测,利用三轴加速传感器和数据采集器获取滚动轴承的工作参数,同样也对工作曲线的分析来达到对轴承诊断的目的。硬件部分设计了传感器数据采集电路、数据处理电路以及RS485数据通信电路。实验数据表明,该系统能有效地采集轴承的数据,为滚动轴承的检测和诊断提供坚实的基础。     

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.