虚拟仪器技术及计算机辅助教学

本文分析了虚拟仪器技术，概括了虚拟仪器特性，讨论虚拟仪器的硬件平台和软件开发平台及其进展情况。最后从虚拟仪器技术支撑角度阐述计算机辅助教学。     

虚拟仪器技术引入测试技术教学的研究与实践

探计了测试技术课程教学中引入虚拟仪器技术的意义,结合课程的性质和虚拟仪器的特点对教学过程的虚拟仪器实现进行了研究,并通过典型实例阐述了教学过程的虚拟仪器实现方法.实践表明,将虚拟仪器技术引入测试技术课程的教学,具有明显的教学效果.     

虚拟仪器技术及其应用

虚拟仪器技术是现代仪器技术与计算机技术相结合的产物。文中较全面系统地介绍了虚拟仪器技术的发展，包括虚拟仪器的概念、系统的构成、特点及其应用实例。     

虚拟仪器技术及其发展趋势

介绍虚拟仪器的硬件技术和软件技术，并指出虚拟仪器的三个发展趋势：以通用串行总线USB接口方式的外挂式虚拟仪器、PXI虚拟仪器和网络化虚拟仪器。     

虚拟仪器技术及其新进展

虚拟仪器是以一种全新的理念来设计和发展的仪器。本文通过高效的软件、模块化的I/O硬件、用于集成的软硬件平台3个方面介绍了虚拟仪器的组成特点,阐述了虚拟仪器技术高性能、强扩展性、开发时间少以及出色的集成4大优势,并从与PC技术及网际网络技术的融合、可编程的虚拟硬件以及虚拟仪器核心——应用软件的可移植开发等几方面分析了当前虚拟仪器技术的新进展。     

国内虚拟仪器技术的应用研究现状及展望

回顾了仪器技术的发展历史,简要介绍了各代仪器的结构和基本特点;全面介绍了虚拟仪器概念的提出,它的基本原理、主要结构、性能特点和分类方法,比较分析了虚拟仪器与传统仪器的性能特点上的异同,对虚拟仪器技术的发展趋势作了展望;分为四种类型对国内虚拟仪器技术的应用研究现状作了详细阐述;最后,展望了未来国内虚拟仪器技术的应用研究     

可重构虚拟仪器系统

针对可重构制造模式对测试系统提出的在线升级和功能调整要求,提出软件总线结构的装配式可重构虚拟仪器系统。主要技术观点包括采用COM技术实现的支持虚拟仪器软件芯片热插/拔的虚拟仪器软件总线模型、动态虚拟仪器脚本解释器模型和自解释型虚拟仪器软件芯片模型,以及基于XML的虚拟仪器装配语言。     

虚拟仪器的数据管理技术

文章介绍了在开发虚拟仪器同时应注意数据管理技术的重要性 ;指出了当前虚拟仪器的数据管理技术存在的一些缺陷 ;在向网络化发展的虚拟仪器必须应用基于数据库的管理技术 ,并提出了构建虚拟仪器测试平台系统的方法     

基于虚拟仪器技术的远程实验室的研究

本文介绍了虚拟仪器技术的概念和特点,重点讨论了如何利用虚拟仪器技术组建虚拟实验室及远程虚拟实验室系统,并说明了虚拟仪器技术在实验教学中的应用。     

虚拟仪器流技术的研究

虚拟仪器流是电子商务技术与虚拟仪器技术相融合的一种仪器信息技术，可以实现虚拟仪器的网络销售、租用、远程调用等功能。介绍了虚拟仪器流的核心技术，如仪器流载体、网络虚拟仪器库、网络数据库、网络仪器加密技术、网络仪器技术支持、电子商务等。探讨了虚拟仪器流运作平台系统的总体设计、模块开发、安装部署等环节，着重开发了电子商务、虚拟仪器库、运行管理服务等功能模块，并进行了实例展示。     

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。     

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.     

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。     

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%.