一种角位移电涡流传感器的原理及应用

设计并实现了一种小角度双E形电涡流角位移传感器，可用于加速度计及陀螺仪闭环控制的校正回路。运用涡流等效原理，从理论和计算上分析了其原理，分析了其反力矩的形成，推导了电涡流传感器的输出方程。对该传感器的输出特性和频率响应特性的实验结果作了分析，结果表明了其可行性，对设计和应用同类传感器有一定的指导意义。     

我国高性能传感器集成电路取得突破性进展北大核心

近日,南京理工大学一篇关于物理传感器方面的论文在微电子学与集成电路领域顶级国际期刊IEEE JOURNAL OF SOLID-STATE CIRCUITS（JSSC）刊出。该研究成果表示我国在MEMS惯性传感器专用集成电路设计方面取得突破性进展。     

电涡流传感器温度漂移的自动补偿

电涡流传感器温度漂移的自动补偿＊方秋华茅佩田新启高（东南大学振动工程研究所南京２１００９６）０引言电涡流传感器具有众多的优点，是一种很有发展前途的传感器，在电力、石化、机械、航空、冶金等部门得到广泛的应用，特别适宜于旋转机械运行参数的测量和监视。它...     

基于高频响电涡流传感器的汽轮机带冠叶片振动测量技术（英文）

针对汽轮机带冠叶片的健康监测需求,提出了一种基于高频响电涡流传感器的带冠叶片振动参数测量方法。转子旋转时,电涡流传感器感知叶冠面积变化,通过检测叶片发生振动时叶冠面积变化信号的到达时间,并应用叶尖定时(Blade tip timging, BTT)数据分析方法获取叶片振动参数。设计了一种适用于汽轮机工作环境的电涡流传感器和一种高带宽调幅解调电路,使响应带宽达到250 kHz以上。某型汽轮机末级叶片振动试验结果表明所设计的高频响电涡流传感器和变面积型叶尖定时测振技术在汽轮机带冠叶片的应用是可行的。     

机器人测距传感器的研究

采用超声波专用集成电路LM1812研制了超声波测距传感器，并进行实验标定，该传感器能够连续适时的测距、显示和传输数据，可用于移动机器人进行测距、导航等。     

信息之窗

由吉林工业大学电焊机研究所研制成功的专用集成电路控制的晶闸管逆变焊机已通过鉴定。此晶闸管逆变焊机ZXT─400Z与国内外同类焊机相比有如下特点：①此焊机将主电路与控制电路共同构成一可控环型振荡系统，在控制电路中无单独脉冲源，这种变频控制法简单可靠。②将控制电路中的主要部分集成在仅有2×3（mm）的专用集成电路芯片上，提高了控制电路抗电磁场干扰的能力。③控制电路的核心是一片专用集成电路，使控制电路大为简化，整个控制电路只有84只元件，安装在140×100（mm）的一块印刷板上。洛阳市孟津传感器制造厂最近研制成功“牙…     

基于厚膜混合集成的硅微机械加速度传感器

采用厚膜混合集成技术实现了硅微机械加速度传感器工程样机。介绍了厚膜混合集成电路工艺的原理和特点、传感器的结构和工作原理，研究了信号提取和处理方法，优化了反馈控制校正电路网络，利用电容转换专用集成电路，通过厚膜技术组装了工程样机。实验结果表明：该单片加速度传感器具有较高的精度和零偏稳定性。     

频差法超声波气体流量计的设计

介绍以频差法为依据，应用超声波专用集成电路LM1812设计的一种超声波气体流量计。     

磁光成像使亚表面缺陷探测可视化的研究

根据间歇式脉冲激励电涡流，以及法拉第磁光效应使反射光的偏振面发生偏转的原理，提出了一种磁光／涡流显微成像技术，目标是实现对亚表面细小缺陷的可视化无损检测。介绍了基本原理和新型传感器的设计，并通过实验与传统涡流传感器进行了比较。     

一种新型熔铝电阻率测量装置

在采用电涡流原理测量熔铝电阻率的研究中变通使用LVDT专用芯片AD598，合理设计传感器结构和标定方法，从而简化了硬件电路，消除了温度影响，在熔铝及铝基合金的凝固研究中得到实用。     

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.