基于单片机高速数据采集系统的设计实现

介绍MAX121芯片的特点以及数据采集电路的构成,给出了MAX121芯片与单片机PIC的接口方法及部分应用程序。     

基于PIC单片机控制的智能巡线小车

介绍了一种智能巡线小车的制作方法,给出了控制系统的硬件电路和软件设计.控制系统的硬件电路部分主要包括控制器、传感器和电机驱动芯片.控制器和传感器分别采用8位PIC系列单片机PIC16F84A和光电判读器TLP909.巡线小车的驱动采用直流电机.     

阵列气体传感器信号检测系统的研究

介绍在一个VC平台下与PIC单片机互连的数据采集系统。利用PIC单片机实现硬件的数据采集,利用VC＋＋编写上位机界面,实现数据的动态曲线显示。     

PM_(2.5)小流量采样器数据采集与导出系统优化研究

基于PM2.5小流量采样器在数据采集与导出系统的需求,设计一种双CH376文件管理控制芯片分别管理U盘与SD卡的系统。陈述系统整体框图,并介绍了系统原理图与单片机ds PIC33控制数据采集与导出的程序流程图。结果表明,该方案成功地解决了之前PM2.5小流量采样器在数据采集与导出过程中出现的效率低且不稳定的问题。     

基于PIC单片机的直流电机PWM调速系统

介绍了基于PIC16F877单片机构成的直流电机调速系统,电机控制芯片采用了L298芯片,该系统使用光电编码器作为检测传感器,通过PWM的输出信号实现对直流电机的调速。同时介绍PIC16F877单片机中与PWM相关的寄存器设置,给出硬件电路和控制程序的简要设计。     

基于电力载波与短信报警的智能楼宇监控系统

设计了一种基于电力载波和短信报警的智能楼宇监控系统,并以PIC16F873A,Yitran载波芯片,STM32 F103 C8 T6单片机为核心开发了由数据采集器、控制板、载波传输模块和短信报警器等组成的监控系统。该系统结构简单,控制方便,数据传输安全可靠,实现了故障点本地声光报警与短信报警相结合的楼宇综合监控。     

基于PIC单片机的工业数据采集卡的研究与设计

介绍了一种基于PIC单片机的工业数据采集卡的设计方案,论述了系统结构、工作原理,着重阐述了硬件电路、软件流程与实现方法.该数据采集卡在SF6微水检测中得到应用,实验证明,该数据采集卡可靠性高、成本低、使用方便.     

PIC单片机在家用电器中的应用

PIC16F87X是美国Microchip公司近年来生产的PIC系列单片机的中级产品。本文介绍了该系列芯片的主要功能，应用该芯片设计了一种带有记忆功能的全自动洗衣机，并给出了该应用系统的硬件组成和软件设计，其具有功能强、结构简单、不需扩展外围器件、成本低等特点。     

由PIC16C74单片机构成的电瓶车控制系统

介绍了用PIC16C74单片机控制的电瓶车控制系统及其驱动芯片HIP4082，阐述了控制方案中的要点及电机保护措施，并给出了电路示意图和软件框图。     

多费率电能表的设计

介绍了一种基于PIC单片机的多费率电能表主电路及通信接口电路，阐述了电能表电路的工作原理。电量的测量采用AD7755专用芯片，可保证测量脉冲数的准确性；硬件日历时钟及参数存储采用串行I2C总线器件，减少了电路连线，提高了电能表工作可靠性。     

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.