输液器温控装置中用2051单片机实现A/D转换

由于单片机所处理的信号是数字信号,对模拟电压信号进行检测处理时首先要用A/D转换器件对其进行A/D转换,然后再进行处理.本论文利用89C2051系列单片机内部独特的结构,不用A/D转换器件即可实现A/D转换,尽可能地降低成本和简化电路结构,并对其测量范围及转换精度进行分析和讨论.     

ADXRS150单轴陀螺仪数据采集系统的实现

通过单片机对ADXRS150陀螺仪传感器进行A/D转换,然后ARM9通过IIC总线读取单片机AD转换后得到的角度值。根据角度值,ARM9做出相应指示,通过IIC发送给单片机,单片机控制机器人左右两个电机运动,从而运动出相应轨迹。单片机主要负责陀螺仪数据采集、AD转换、控制电机运动,而ARM负责运动决策、人机交互等。实验表明,该系统运行稳定可靠,陀螺仪数据采集正确无误。     

提高A/D转换速度的方法

数字仪表及单片机测控系统中,A／D变换是不可缺少的环节。对于模拟量变化较快的系统,A／D变换速度也相应要求快些,才不至于丢失信息。然而A／D变换速度和成本是矛盾的。本文试以MSP430F11X1系列单片机为例,探讨以较低成本提高A／D转换速度的方法。     

电梯轿厢微机化电子称重仪

介绍了用8031单片机设计了用较少的硬件电路完成A/D转换、漂移跟踪、载荷量指示、载荷信息输出等功能的电子称重仪.     

提高单片机A/D转换分辨率的系统设计方法

单片机中内置的A/D转换器的分辨率大多数为10位分辨率,在高精度的应用中需要外扩更高分辨率的A/D转换器,这将增加系统的硬件成本。该文介绍一种利用模拟开关、集成运放和少量电阻在单片机外围构成硬件电路,利用逐次逼近的转换原理,用以将单片机A/D转换器的分辨率从10位提高到13位。     

橡胶炉膛多点温度检测系统

介绍一种以8031单片机,D/A转换器和可编程增益放大器,实现16路模拟量输入、8路模拟量输出的温度检测系统。     

改进双积分A/D转换技术

介绍了一种利用单片机资源软硬件结合，双极性输入、高精度、低成本双积分A／D转换技术，详细分析了A／D转换速度、精度，输入幅度等因素影响，使用非常灵活，接口简单，特别适合仪器仪表中作传感器A／D转换用途。     

高精度自动含气量测量装置设计

设计了一种高精度自动含气量测量装置.通过传感器及流量计对气体体积流量信号进行收集,再经过高速串行A/D转换芯片MCP3202进行A/D转换,转换后的数据由单片机送入片外RAM存储器.选用可串行编程的STC12C5410AD单片机来实现对数据的计算和分析,将测量结果存储在EEPROM中,等待PC机的响应,并最终将结果送给PC机,PC机负责显示流量曲线.     

基于AT89S51单片机的微型土壤湿度检测仪设计

为便于掌握土壤的湿度状况,设计了微型土壤湿度检测仪。其硬件系统包括信号放大电路、A/D转换电路、单片机、微型液晶显示器和报警电路等;软件系统包括A/D转换的驱动程序、液晶驱动程序两个模块。基于Proteus软件平台对系统的设计进行了仿真,结果表明系统的软硬件设计正确,运行可靠。     

飞机蓄电池输出电压微型监测仪的设计与仿真

为便于掌握飞机蓄电池的工作状态,设计了输出电压微型监测仪。其硬件系统包括串联分压电路、A/D转换电路、单片机、微型液晶显示器和报警电路等;软件系统包括A/D转换的驱动程序、液晶驱动程序和监测数据处理三个模块。基于Proteus软件平台对系统的设计进行了仿真,结果表明,系统的软硬件设计正确,运行可靠。     

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.