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...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

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...