共查询到20条相似文献，搜索用时 187 毫秒
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《科学中国人》2020,(9)
正一种基于"磁扭电"效应的新型磁场传感器西安交通大学电子科学与工程学院刘明教授课题组设计了一种基于"磁扭电"效应的新型磁场传感器,该传感器采用了一种全新的力-电耦合结构,能够将磁扭矩转化成应力,并施加在压电材料上,实现了磁场作用下电信号的输出。相关研究成果发表于IEEETransactionsonIndustrialElectronics。该器件的结构通过有限元仿真软件优化后,可有效去除干扰信号,提高输出信号的纯度;力-电耦合结构可显著改善输出信号对探测方向的敏感性。基于"磁扭电"效应,课题组开发了可用于二维平面磁场大小和方向探测的磁电罗盘,该传感器可同时测量面内交流磁场的强度和方向。 相似文献
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《内蒙古科技与经济》2021,(10)
针对地质勘探中的微弱信号,提出了微弱信号测量系统前通道噪声模型,并设计了一款基于FPGA的12通道微弱振动信号采集系统;该系统以FPGA为主控制单元,以ICP压电式加速度传感器为前端信号采集单元实现对微弱振动信号的采集,信号经过程控增益放大、信号衰减、模数转换、数据处理、数据传输、上位机显示等流程,实现了对12通道微弱振动信号的实时采集和分析;该系统采集信号的频带范围在0.05kHz～10kHz,采样间隔在0.01ms～8.0ms,输出噪声10uV;该系统满足使用需求,具有精度高,传输速率快,多通道,体积小,功耗低等优点,具有广泛的应用前景和社会效益。 相似文献
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本文提供了一种带自适应拼接的移相采样技术,利用FPGA技术在各种环境下都可以稳定可靠的利用较低的工作频率下完成高速脉冲采样,可以广泛应用于脉冲信号的脉宽、到达时间等特性参数的测量. 相似文献
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针对复杂地质环境里地下位移测量中的距离测量困难的问题,设计了一种应用于复杂地质环境的距离监测装置。测距装置中安装螺管式线圈的圆管作为发射管,包含霍尔传感器与对磁力线具有导向作用的导磁结构的圆管作为接收管,两节圆管组成一组装置,将多组装置埋于岩土中。当岩土中发生位移时,两节圆管间距离发生变化,数据采集电路采集霍尔输出的电信号利用通信总线发送给上位机。通过实验模拟建立发射管与接收管相邻两个面圆心间的距离与霍尔输出电信号间的数学关系,从而通过测量霍尔输出电信号实现距离的实时在线测量。实验结果表明,发射管与接收管间距离不变但轴线夹角在0°～30°变化时霍尔输出电信号保持恒定,测量结果可以实时显示,10～40 mm距离范围内,距离测量误差小于0. 91186 mm。 相似文献
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智能电动两轮平衡车的稳定性很大程度上取决于车体姿态信息检测的准确性。为解决低成本传感器测量精度不高的问题,实现对平衡车俯仰角和横滚角的高精度测量,本文采用卡尔曼滤波算法,利用加速度计所解算的姿态角建立观测方程,利用陀螺仪输出的角速度建立状态预测方程,建立卡尔曼滤波器,实现陀螺仪和加速度两传感器数据的融合,最终完成对平衡车姿态角的估计。 相似文献
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利用新型斩波式内反馈高压调速电机,采用微机实时控制技术,讨论并设计了一种基于管网压力反馈的节能供水系统。运行结果表明,该系统稳定可靠,控制简便,节能效果显著。 相似文献
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Xiaobo Chi Xinchun Jia Fangqin Cheng Maohong Fan 《Journal of The Franklin Institute》2019,356(6):3661-3691
This paper studies networked H∞ filtering for Takagi–Sugeno fuzzy systems with multi-output multi-sensor asynchronous sampling. Different output variables in a dynamic system are sampled by multiple sensors with different sampling rates. To estimate the signals of such a system, a continuous multi-rate sampled-data fusion method is proposed to design a novel networked filter. By considering a class of decentralized event-triggered transmission schemes, multi-channel network-induced delays, and the updating modes of the MOMR sampled-data, a networked jumping fuzzy filter is proposed to estimate system signals based on the transmitted multi-rate sampled-data of fuzzy system and the multi-rate sampled states of filter, and the jumping among filter modes is governed by a Markov process which depends on the arrival times of sampled output sub-vectors. To deal with asynchronous membership functions, the networked fuzzy filtering system is modeled as an uncertain fuzzy stochastic system with membership function deviation bounds. Based on stability and H∞ performance analysis, several membership-function-dependent conditions are presented to co-design the event-triggered transmission schemes and the fuzzy filter such that the filtering error system is robustly mean-square exponentially stable with a prescribed H∞ attenuation level. Finally, the improvement in estimation performance and comparison with the existing filtering methods are discussed through simulation examples. 相似文献
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针对多通道MUXDAC系统的同步问题,采用数字相关法进行反馈时钟鉴相,提出一种适于FPGA的低采样率反馈算法.对算法原理、实现方法及影响算法精度的各参数进行了分析.该算法在雷达双通道信号发生器系统中得以应用,证明了其正确性.算法简单易行,提高了系统可靠性. 相似文献
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本文讲述了在地球物理磁法数据处理领域中,数据库查询系统开发所遇到的特殊问题,如区域查询,并给出了系统的设计与实现. 相似文献
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本文介绍了无中心多信道选址移动通信系统,为这一系统的全面数字化设计了新的数字信令,并详细介绍了这套数字信令的帧构造过程及关键域的参考设置。同时这套数字信令还具有良好的差错控制性能,最后通过在Systemview下的仿真证明了它的差错控制确实能大幅优化系统误码率。 相似文献
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随着Web2.0技术的广泛普及和科学研究任务的复杂性提高,信息查寻领域的单用户范式越来越显示出局限性。基于此,本文阐述了科研工作者合作信息查寻行为研究的基本进展,从个案观察分析法、访谈法、调查统计分析法3个不同视角反映学术信息合作查寻的通用研究方法,并针对研究任务的复杂性、研究任务的创新性、科研工作者的知识结构和认识能力、信息查寻的社会性4个层面,提出了科研工作者合作信息查寻行为发生的动机,讨论了其对信息查寻环境优化、查寻系统构建与改进的影响。Abstract： With the wide popularization of Web2.0 technology and the growing complexity of the task for scientific research,the single user paradigm in information seeking field has more and more limitations.Based on this,this paper introduces the basic development of the research on collaborative information seeking behaviors of scientific research personnel.The paper reflects the general research method of academic information collaborative seeking from 3 different perspectives of case observation analysis,interviews,and investigation statistical analysis.The paper puts forward the motivation of scientific research personnel in collaborative information seeking from 4 aspects,that is,the complexity of research task,the innovation of research task,the knowledge structure and cognition capability of scientific research personnel,and the sociality of information seeking.Finally,the paper discusses the influences on the optimization of information seeking environment,and the construction and improvement of the information seeking system. 相似文献
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我国农业物联网发展现状及对策 总被引：9，自引：0，他引：9
文章分析了现阶段农用传感器、农业数据采集与传输、GIS和GPS以及农业智能数据处理等核心农业物联网技术在我国的发展现状及其应用情况;重点阐述了农业物联网在农业生产、农产品市场、农业管理及电子政务领域的应用进展,论述了农业物联网对改造与提升我国传统农业发展模式的重要意义,同时对我国农业物联网未来的发展趋势做出了科学预测。 相似文献
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This paper studies the asynchronous state fusion estimation problem for multi-sensor networked systems subject to stochastic data packet dropouts. A set of Bernoulli sequences are adopted to describe the random packet losses with different arriving probabilities for different sensor communication channels. The asynchronous sensors considered in this paper can have arbitrary sampling rates and arbitrary initial sampling instants, and may even sample the system non-uniformly. Asynchronous measurements collected within the fusion interval are transformed to the fusion time instant as a combined equivalent measurement. An optimal asynchronous estimation fusion algorithm is then derived based on the transformed equivalent measurement using the recursive form of linear minimum mean squared error (LMMSE) estimator. Cross-correlations between involved random variables are carefully calculated with the stochastic data packet dropouts taken into account. A numerical target tracking example is provided to illustrate the feasibility and effectiveness of the proposed algorithm. 相似文献