USB接口智能传感器标定数据采集系统的设计

传统智能传感器标定系统数据采集通常采用专用的板卡，成本高，采集点数十分有限。通用串行总线USB为传感器标定系统的多点数据采集和传感器的网络化标定提供了很大的便利。利用USB可以实现较传统方式更有效、更方便、更经济的多传感器标定系统数据采集。介绍利用USB接口来实现智能传感器网络化标定系统的设计。     

机床温度与热误差实时检测系统的开发

介绍了温度和位移数据实时采集系统的构成和实现方法,硬件以温度、位移传感器和凌华的PCI总线数据采集卡为核心;软件开发利用NI公司的虚拟仪器（LabVIEW）不平台。为实现较高的测量精度,设计制作了无源RC滤波电路和被测芯棒,对涡电流位移传感器进行了精确标定。经过试验,此采集系统完全满足测量精度和自动采集的要求。     

方向盘转角传感器性能标定及检测系统设计

针对某企业方向盘转角传感器性能标定和检测的需求,设计了一套方向盘转角传感器性能标定及检测系统,该系统能够实现对方向盘转角传感器的性能标定补偿和自动检测。基于PCI数据采集卡设计的高精度数据采集模块实现了对过程数据的实时采集;基于低惯性伺服电机、MPC08运动控制板卡设计的驱动加载系统实现了方向盘转角传感器静态标定时的驱动角度精准控制;采用高速CAN总线通信对方向盘转角传感器信号进行高速通信,实时读取方向盘转角传感器角度信息;使用LabVIEW编程软件,完成对方向盘转角传感器标定检测流程的实时控制、数据采集处理显示等功能。在方向盘转角传感器完成灵敏度标定后,经检测,其非线性误差、迟滞误差等均在允许范围之内。对方向盘转角传感器性能标定及检测系统进行大量重复性试验,得出输出角度的合成标准不确定度为0.145°,试验数据表明,该系统能够满足企业对于方向盘转角传感器性能标定和检测功能的测试要求。     

传感器自动标定系统在南瑞研制成功

2011年5月26日,南瑞水利水电分公司自行研制成功的系列传感器自动标定系统——“位移类传感器自动标定系统”、“应变类传感器自动标定系统”实现了位移类、应变类传感器的自动标定,目前该系统已通过南京市计量监督检测院检验,取得相关合格证书。     

反射式光纤位移传感器现场应用快速定标

介绍了一种快速、便捷、高精度的反射式光纤位移传感器标定系统。可在不同使用环境、不同测量材料条件下对反射式光纤位移传感器快速定标,具有很好的可靠性和稳定性。该系统由计算机控制器、高分辨率的激光位移传感器、高精度步进电机、高刚度的标定工作台和待标定光纤位移传感器组成。激光位移传感器作为标定参考设备;步进电机作为固定被测材料的推动设备。对电机运动实现闭环伺服控制,精确控制被测材料的移动。对光纤位移传感器在不同环境和不同材料条件下自动标定并输出标定曲线。经测试,该系统在高精度测量的条件下仍具有很好的可靠性和稳定性。     

基于虚拟仪器的位移传感器在线标定

通过对一实验系统中的位移传感器使用环境设王、实验数据的测定、拟合的方法选择等措施,实现了位移传感器在虚拟仪器环境中的在线标定.数据拟合时用Madab进行最小二乘曲线拟合.结果证明对直线度较差的位移传感器采用曲线拟合可取得较好拟合精度,标定取得良好结果.     

1D-PSD数据采集电路设计及线性度标定

本研究旨在实现光斑位移的测量,选用一维光电位置传感器(PSD),根据其工作原理及输出特性,设计并搭建了一套基于单片机的PSD信号数据采集系统。通过单片机控制HCF4052多路转换、AD7606模/数转换等实现对PSD信号的转换采集,并对PSD进行线性度标定。实验结果表明,单片机数据采集电路精度优于10μm,满足实验精度要求。标定出PSD线性度小于等于0.055%的有效距离为9~16.5mm,这为PSD应用于光电检测等方面的一系列研究奠定了基础。     

高精度角度传感器自动标定系统

采用直流力矩电机分度,同步采集系统进行数据采集,对高精度两路关联角度传感器自动标定。为了实现秒级角度的自动标定,采用了闭环控制系统和角度误差补偿,在±3°范围内,控制精度可达到0.2″。利用虚拟仪器技术整合数据采集和控制系统,使得标定高效方便。     

基于LabVIEW的汽车电子油门踏板测试系统研究

简要介绍了基于虚拟仪器图形化语言LabVIEW开发的汽车电子油门踏板测试系统。系统采用高精度力传感器与位移传感器进行前端数据采集,在计算机控制下实现了对汽车电子油门踏板的动态数据采集,在显示器上生成即时的力-位移、电压-位移、接触电阻-位移等多条曲线以及其他诸多参数的测试结果,同时实现了LabVIEW环境下大量测试数据的数据库管理,对不合格的踏板自动进行声光报警。     

多维力传感器的动态标定研究

提出了一套对六维力传感器经行标定的系统,用于动态载荷情况下六维力传感器动态标定。该系统以lab VIEW为软件系统,以高精度伺服电机为精确动力源,以高精度砝码作为标准质量,通过伺服电机带动标准质量做匀速圆周运动产生标准动态力。配合有限元分析软件PATRAN对设计工装的强度、刚度及固有频率的分析。实现了在特定频率范围内的传感器的精确动态标定。实验结果表明系统对六维力传感器的标定是合理可靠的。     

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.