蓝牙技术在汽车驾驶盘控制系统的应用

控制系统采用蓝牙模块,主控设备采用STM32F103微控制器,将驾驶盘上触摸按键的信号采集并处理后送入蓝牙芯片进行无线发送;从控设备蓝牙模块接收到主控设备的信号后,从控芯片STM32F103根据不同的信号发送相应的指令通过CAN总线控制车辆导航、车载音响、车窗升降和车灯照明4大系统的操作,同时在触摸液晶屏显示。通过实验证明,本控制系统使大部分操作在驾驶盘上实现,汽车驾驶更便捷更安全,有较高的应用价值。     

基于MCU和CPLD的HID类自定义键盘研究与实现

在一些特殊应用场合,需要设计一种满足USB接口HID类协议的自定义按键功能的键盘,按照应用场合可扩充或裁剪按键数目,系统应用程序根据接收的按键码调用相应的功能子函数。文章研究的是基于带有USB接口控制器的单片机和CPLD组合设计实现的HID类自定义按键功能键盘操控模块,通过编写单片机固件驱动程序和CPLD控制程序,把操控模块映射为windows系统标准HID类设备,windows应用程序接收按键码,回复并发送控制信息给控制模块。实验结果表明,设计合理、系统适应性强、硬件构造模块化,可扩展至其他应用场合如工业现场控制环境使用。     

车载音响系统收音方案的技术发展

车载音响系统收音机部分是一个必不可少的功能,并且人们对收音质量的要求越来越高。随着芯片科技的发展,收音方案也在不断地发展变化。通过对收音方案的技术研究,希望能对车载音响开发生产起到帮助作用。     

车载触摸控制的人机交互系统

随着电子设备在车辆中大量应用,监测信息与控制按键也不断增多,现有车载中控平台已难以满足功能需求。因此,设计了一种触控人机交互系统,采用ARM作为处理器,通过移植Linux内核与Qt/E对系统加以实现。该系统可通过触控界面实现车载CAN网络中各设备的控制,并实时显示车辆状态信息,经测试,运行稳定、可靠,达到了设计要求。     

国产车载蓝牙系统上市

由重庆舍瓯科技发展公司研发的蓝牙车载免提系统已投入市场。该通信系统由车上点烟器供电，拥有扬声器和音量控制按键，无需额外的数据线和卡座，直接通过控制接键切换接电话。     

基于FPGA的车载多路图像采集传输系统的设计

论文提出了一种基于FPGA的多路图像采集传输系统的设计方案,应用于车载环境中;系统结构包括4个图像采集节点和1个中心控制节点,采集节点由FPGA控制CMOS图像传感器采集图像,并实时存储于FLASH中;为屏蔽车载环境中的电磁干扰,采集节点与控制节点之间采用塑料光纤作为通信介质。论文设计了一种适合车载图像数据传输的通信协议,实验验证表明,系统能够实现多路图像数据的实时采集和存储,并将各路图像数据稳定地传回PC机进行显示。     

按键双物料注射成型的模具设计

字符按键,采用双物料注射成型工艺成型,由于字符中存在封闭回圈,必须将塑件结构与模具结构相配合,才能使熔融塑料填充到字符嵌件中成型。本文阐述了该成型工艺的模具设计,实际应用证明该模具符合产品生产的要求。     

按键ESD触发问题分析及防护研究

某车载信息娱乐主机在ESD静电试验中,出现按键被ESD触发的现象。调查发现面壳按键之间的装饰条有导电性,且没有采取任何接地措施。研究面壳结构与静电放电路径之间的关系,发现因为装饰条有导电性,缩短了面壳缝隙到内部电路板的空气间距,导致ESD击穿。最终采取了两项改善措施:(1)更换为绝缘的装饰条;(2)优化PCB布置。     

基于SINUMERIK 828D BASIC数控系统的三轴五面铣床立卧刀库换刀的用户界面开发

SINUMERIK 828D BASIC系统是紧凑型数控系统,能够较为灵活地解决大型复杂机械结构类问题,充分发挥应用工程师的开发创造力。用户界面开发工具在使用过程中可以减少按键,实现组合检测,使开发更加直观和简便。     

车载平台变形对测角误差的影响分析与修正

为了分析车载平台变形对经纬仪测角误差的影响,将平台变形分为平移和旋转两类。采用数值模拟实验论证了平台旋转变形是影响测角误差的主要因素,建立了车载经纬仪测角误差与旋转变形角的     

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.