基于MATLAB和单片机的数字滤波器的设计

本文从MATLAB和单片机的角度，实现了数字低通滤波器的设计。本设计搭建了以单片机为核心的硬件电路，通过MATLAB工具箱来设计数字低通滤波器，得到滤波器的系数，而后在单片机中编写汇编程序，用Proteus实现信号的仿真。     

PC机与无通讯功能的单片机系统数据交换

在实际单片机应用系统中，单片机本身不一定有通讯功能。针对这种系统，本文以电子锁为例，探讨了上位机与这种单片机系统的数据传递方法。     

基于89C2051单片机的热表通讯模块的开发

介绍了利用89C2051单片机开发某热表的通讯模块，并将其应用于实验用主从分布式控制系统中，实现了工控机同多个热表的串行通讯。阐述了串行通讯规程，利用单片机的普通I／O端口实现串行口功能的方法，从而解决了该单片机在实际的串行通讯应用中串口资源少的问题。通讯模块通过RS-485通讯方式实现了热表与工控机的远距离通讯。在充分利用单片机端口资源的基础上完成了工控机与多台单片机通讯。     

单片机控制系统中实现DMA数据传送的方法

为实现单片机控制系统中高速数据的传送，应用接口扩展电路和DMA控制器，通过存储器扩展，在几乎不占用单片机资源的情况下，实现了单片机控制系统的DMA数据传送。该方法可用于软盘驱动器或高速采样的接口设计。     

基于USB接口的条形码数据采集系统

介绍一种利用单片机进行条形码数据采集的方法，讨论了条形码扫描器与单片机的硬件接口设计和软件编程。通过USB接口实现单片机与微机的数据通信，完成条形码数据的上传。     

基于Keil和Proteus的单片机课程改革

《单片机原理与应用》是机电、自动化控制等专业的核心课，该门课程基于职业教育为理念，培养实用性人才为目标，对单片机课程的教学内容、方法等方面进行一系列的研究，本文主要针对单片机实践环节进行改革探索，提高学生学习兴趣，改善教学效果。     

热轧机热辊的单片机自动控温系统的设计

介绍一种单片机控制的非织造布设备热轧机热辊的单片机恒温控制系统，它是以８０９８单片机为核心，以温度传感器、毫伏放大单元、多路Ａ／Ｄ变送单元、多路可控硅触发单元等组成的一个多路闭环控温系统。     

提高单片机系统灵敏度的一种方法

提高单片机系统灵敏度的一种方法黄勤（重庆大学自动化系重庆市６３００４４）１提高８０９８单片机内Ａ／Ｄ转换器小信号分辨率的方法实验证实。８０９８单片机内部Ａ／Ｄ转换器在零点附近存在不转换区，它严重影响单片机系统的灵敏度。为此，我们采取了以下措施：（１）...     

RO反渗透制水机组控制系统的设计

介绍了RO反渗透制水机组控制系统的设计，给出了GP显示器与单片机实现通信的技术，同时还介绍在一个系统中使用两个单片机并行工作和使用并行总线实现两个单片机通信的方法。     

热轧机热辊的单片自动控温系统的设计

介绍一种单片机控制的非织选布设备热轧机热辊的单片机恒温控制系统，这是以８０９８单片机为核心，以温度传感器、毫伏放大单元、多路Ａ／Ｄ变送单元、多路可控硅触发单元等组成的一个多路闭环控温系统。     

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.