石英晶体微天平气敏传感器阵列测量系统

为克服现有单气敏传感器测量系统非自动识别气体种类和浓度的缺陷,采用一种基于以太网传输协议的32通道石英晶体微天平(QCM)测量系统。该系统由QCM气敏传感器阵列起振模块和高精度频率计数卡组成。起振模块产生32路石英晶体频率信号;高精度频率计数卡通过FPGA内部计数器直接采样频率信号,通过以太网高速传输到上位机进行数据存储、数据处理及信号波形显示。测试结果表明:系统可以实现实时、多通道、高速、高精度采集和发送数据。     

基于FPGA的嵌入式QCM检测系统设计

针对目前检测仪器灵敏度低、实时性较差等问题,设计了以FPGA为核心的高精度QCM检测系统。并行处理、预测技术和FPGA可重构功能相结合,加快了数据处理速度,提升了硬件集成度,抑制了噪声干扰,提高了检测分辨率。为验证系统性能,在阻尼介质中进行了测试。结果表明,与QCM传感器一起配合,该系统完全满足高精度、实时测量的要求。     

宝德公司全自动原子荧光光度计和流动注射分析仪通过鉴定

正日前,北京宝德仪器有限公司的全自动原子荧光光度计和全自动流动注射分析仪通过中国分析测试协会组织的鉴定会。专家组组长为清华大学张新荣教授。BDFIA-8000全自动流动注射分析仪采用小型化、一体机设计,实现了16个通道可同时工作,提高了检测的效率;通道间无共用装置,通过WLAN通讯接口,可实现多通道、多地点布控,实时采集数据;蠕动泵采用自行设计加工的整体金属压块,无     

基于LXI的数据采集管理软件设计与实现

开发一套基于标准Lx I协议的24通道桥梁微应变采集器的上级采集管理软件,具备数据采集管理的软件系统,能进行连续不间断的数据采集,实现应变参数的动静态测量。采用了优化的多线程并发队列技术,提高了采集软件的实时性,并具有通道独立的应变传感器调零和灵敏度修正功能。对下级多个微应变采集器统一管理,实现对任意采集器的各通道独立参数配置、并以多种采集方式进行数据采集、传输控制、采集数据实时显示与回放、数据库存储等功能的基于Lx I的C/S模式上位机软件提供给用户。控制仪器完成操作并反馈仪器执行的结果,实现用户和仪器模块之间的远程交互控制。同时,提供给用户动态链接库,实现数据采集器与用户软件的接口,能够进行二次开发。     

液相单片阵列QCM传感器及测量系统研究

研究一种用于液相检测的单片阵列QCM传感器及测量系统.在一个石英基片上制作多个QCM单元,封装成适于液相检测的阵列QCM器件;基于同一振荡电路,通过选通激励方式,测量阵列中的各敏感单元,消除振荡电路的差异性影响.采用嵌入式微处理器LPC2132和CPLD器件XC9572构建并行频率测量及控制系统,实现多通道QCM测量﹑控制﹑计算显示和数据通讯等功能,构成一个完整的液相QCM阵列传感器系统平台.     

电子立柱锁ESCL功能检测系统设计

设计了基于LabVIEW平台的汽车电子立柱锁ESCL(selectrical steering column lock)的检测系统.该系统由检测机构、下位机、上位机和检测仪器组成,由下位机控制气缸实现电子立柱锁的夹紧、上电、行程测量和打标等功能,上位机远程控制检测仪器,并实时采集数据,软件结构采用了主/从设计模式,集成了通信、实时测量、质量判别和分析、数据记录和查询等几大功能模块.检测系统具有检测准确、稳定可靠、功能完善的特点,满足了电子立柱锁检测的实际需求.     

基于PXIe总线的高速数据采集程控系统

针对单粒子撞击测试中窄脉冲信号的长时间检测问题,提出了一种基于PXIe总线以及数据采集卡的高速数据采集程控系统,实现了高速数据采集存储、实时脉冲数量统计、数据回放、远程控制仪器等方面功能,采用NI-PXI-5122数据采集卡实现了4通道、50 MSPS/Ch采样率、14 bit采样精度的同步采样,采用NI-HD-8265磁盘阵列实现了380 Mbyte/s以上数据流量1 h的连续流盘存储,应用Lab VIEW开发了系统软件,对采集流盘和程控仪器进行控制,利用模拟实验平台产生脉冲信号对系统的采集存储能力进行了测试。研究结果表明,该系统能以高采样率进行多通道的长时间数据采集,能够实现实时脉冲数量统计、数据回放、计算机远程控制等多项功能。     

石英晶体微天平传感器在生物和化学领域的应用

石英晶体微天平技术(QCM)由于操作简单、低成本、无危害、实时在线分析和省时省力等优点,在生物传感器、材料科学、环境监测、临床医学和电化学等领域有很好的应用.本文综述了近期基于QCM的传感器技术在挥发性有机物、双酚A、二恶英化合物和敌敌畏、气体分析、手性识别和成分分析、生物分子监测和细菌监测等化学和生物监测领域的应用,并对其今后的发展进行了展望.     

基于LabVIEW的汽车遥控钥匙自动检测系统设计

设计了基于LabVIEW平台的汽车遥控钥匙自动检测系统,替代了传统的人工检测.检测系统由自动检测机构、下位机、上位机和检测仪器组成,由下位机控制机械手和气缸等实现自动取料、自动送料、自动加压和自动分拣等功能,上位机与检测仪器通过多总线方式实时采集钥匙的检测参数,采用了状态机结构,集成了实时测量、通信、质量判别、数据记录和查询等几大功能模块.检测系统具有稳定可靠、自动化程度高和测量精度高等特点,满足了遥控钥匙产品检测现代化生产的需要.     

石英晶体微天平的研究进展及应用

介绍了石英晶体微天平的基本原理和结构,重点介绍了仪器研究进展及应用,包括常规石英晶体微天平（QCM）、耗散型石英晶体微天平（QCM-D）、阵列式石英晶体微天平与电化学石英晶体微天平（EQCM）。     

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...     

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。     

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。     

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.     

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。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

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.     

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.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.