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。     

一种闭环控制圆光栅角度分度测量装置

研制闭环控制的用于角度标定与测量的分度装置,该装置以永磁直流力矩电机驱动精密轴系主轴的运转带动角度分度盘的转动,以圆光栅测量系统检测主轴的转动角度.由电流环、速度环和位置环组成的闭环控制系统实现零误差分度定位控制.研究圆光栅测量信号处理中信号细分形成的系统非线性误差对分度精度的影响,建立误差修正模型.经检定,系统在±5°的角度范围内分度精度达到±0.2",定位重复性0.06".     

大口径光学薄膜透反射率测量方法的研究

设计了大口径光学薄膜透、反射率自动测量系统,该系统能在宽波段、大角度范围内进行自动测量;重点论述了大角度测量厚度较大的样品时机械结构的实现;介绍了系统光路的设计和数据采集部分的实现;分析了测量误差的主要来源,并提出相应的解决办法。     

基于LabVIEW的LED光强角度分布自动测量实验系统

为了提高LED光强角度分布测量的精度和速度,本文通过LabVIEW与单片机系统相结合的控制方式,设计了一套光强角分布自动测量实验系统。该系统利用单片机作为下位机,负责步进电机的转动控制及光强探头的数据采集控制;利用具有LabVIEW平台的微机作为上位机,负责给下位机发送控制指令并记录光强数据,最后以图形方式显示测量结果。该系统不但可以提高LED光强角度分布的测量效率,还提供了一个开放的LabVIEW平台,使学生可以自主搭建完成该实验的控制系统和采集系统的程序框图。     

一种测量用标杆自动竖直保持装置

本文旨在设计开发出一种测量用标杆自动竖直保持装置,用于土木建筑、水利工程和国土调查等测量时标杆的自动竖直调整定位与状态保持,以适应GPS技术应用对测量精度提高的要求,并减轻人工操作劳动强度.所设计的标杆自动竖直保持装置主要由机电执行机构、二维角度传感器、单片机控制系统等构成.二维角度传感器安装在执行机构前端并与标杆轴线保持平行以获得标杆与竖直位置的角度信息,控制系统通过采集到的角度信息驱动呈极坐标结构的执行机构对标杆进行二维调整,从而将其调整到竖直状态并予以保持.完成的样机调整精度为±1',达到使用要求水平.     

高轨遥感卫星光轴指向误差夹角测量系统标定方法研究

针对空间环境应用中航天器结构形变夹角测量系统因系统误差导致测量精度较低的问题,提出一种基于自准直对比系 统的夹角测量系统标定方法。 通过该方法对夹角测量仪进行标定后得到标定系数,并应用仿真数据对系数进行验证。 验证结 果表明,夹角测量系统量程可达到±25′,测量分辨率可达到 0. 1″。 使用标定后的夹角测量系统进行角度检测,并将测量结果与 自准直仪进行对比。 结果表明,该标定方法简单方便精准度高,计算测量结果与标准值的差值的绝对值,夹角测量仪测量精度 达到±0. 2″,标定后夹角测量仪精度满足卫星使用要求,该方法的应用将为卫星在轨结构微形变研究提供技术支撑。     

高精密位移传感器标定技术的研究

为实现对高精密位移传感器的自动标定,提出一种采用微位移发生系统产生标准被测量,激光传感器作为标准量检测系统,同步数据采集系统进行数据采集,计算机系统控制采集系统与处理数据的标定系统。通过合理设计压电陶瓷微动调节装置,实现其控制精度约为5%/FS.实验表明该标定系统方便高效。     

数据采集系统内部自动校准模型的建立

提出了由数据采集系统内部自动校准以零偏误差和增益误差为主的日常测试误差。依据若干合理的假设,建立了适用于数据采集系统中每次上电后通道自动校准的一系列模型:调零模型、标定模型、测量模型,并得出了如下结论:这三个模型均满足分段线性关系;测试模型的零偏可由调零模型消除;测试模型的增益可由标定模型确定。经实际操作验证,该方法正确、简便。     

数据采集卡在流量标定装置控制系统改造中的应用

介绍了数据采集卡在流量标定装置控制系统改造中应用的关键技术。     

高温压力传感器测试标定系统的研究

高温压力传感器的标定对于传感器的应用和开发具有非常重要的意义。为了适应高温环境下的气体压力传感器标定,设计实现了由压力控制系统和温度控制系统组成的测试标定系统总体方案。结合单片机自动控制系统和LabView上位监控程序,实现了压力3M Pa和高温150℃下的压力传感器标定测试。     

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.