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Fast measurement and prediction method for electromagnetic susceptibility of receiver
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作者 CHEN Yan LU Zhonghao LIU Yunxia 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2024年第2期275-285,共11页
Aiming at evaluating and predicting rapidly and accurately a high sensitivity receiver’s adaptability in complex electromagnetic environments,a novel testing and prediction method based on dual-channel multi-frequenc... Aiming at evaluating and predicting rapidly and accurately a high sensitivity receiver’s adaptability in complex electromagnetic environments,a novel testing and prediction method based on dual-channel multi-frequency is proposed to improve the traditional two-tone test.Firstly,two signal generators are used to generate signals at the radio frequency(RF)by frequency scanning,and then a rapid measurement at the intermediate frequency(IF)output port is carried out to obtain a huge amount of sample data for the subsequent analysis.Secondly,the IF output response data are modeled and analyzed to construct the linear and nonlinear response constraint equations in the frequency domain and prediction models in the power domain,which provide the theoretical criteria for interpreting and predicting electromagnetic susceptibility(EMS)of the receiver.An experiment performed on a radar receiver confirms the reliability of the method proposed in this paper.It shows that the interference of each harmonic frequency and each order to the receiver can be identified and predicted with the sensitivity model.Based on this,fast and comprehensive evaluation and prediction of the receiver’s EMS in complex environment can be efficiently realized. 展开更多
关键词 electromagnetic susceptibility(ems) RECEIVER dualchannel multi-frequency nonlinear response frequency domain power domain
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EMS型中低速磁浮列车悬浮架技术研究综述 被引量:8
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作者 马卫华 胡俊雄 +2 位作者 李铁 罗世辉 刘树洪 《西南交通大学学报》 EI CSCD 北大核心 2023年第4期720-733,共14页
悬浮架是承载EMS(electro-magnetic suspension)型中低速磁浮列车运行的关键子系统,影响列车的悬浮稳定性、舒适性和安全性,需要对其进行深入研究.围绕国内外EMS型中低速磁浮列车应用案例,介绍了(悬挂)端置式悬浮架、(悬挂)中置式悬浮... 悬浮架是承载EMS(electro-magnetic suspension)型中低速磁浮列车运行的关键子系统,影响列车的悬浮稳定性、舒适性和安全性,需要对其进行深入研究.围绕国内外EMS型中低速磁浮列车应用案例,介绍了(悬挂)端置式悬浮架、(悬挂)中置式悬浮架的技术方案和特征,总结了主要技术指标.结合悬浮架技术研究、发展现状,讨论了磁轨作用关系、运动解耦能力、动力学性能、结构强度以及悬浮冗余设计五大研究方向,通过对研究内容梳理和总结,归纳了现有前沿科学问题和工程技术挑战:一是轨距亟须统一;二是动态磁轨关系研究欠缺;三是悬浮架横向动力学有待研究;四是悬浮架疲劳强度分析及试验不足;五是悬浮架机械结构冗余设计方案较少. 展开更多
关键词 电磁悬浮(ems) 中低速磁浮列车 悬浮架 发展动态
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Improved direct power injection model of 16-bit microcontroller for electromagnetic immunity prediction 被引量:3
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作者 高雪莲 田聪颖 +2 位作者 落丽媛 陈银红 陈彦宇 《Journal of Central South University》 SCIE EI CAS 2011年第6期2031-2035,共5页
To promote the modeling standardization process of the integrated circuits, an improved electrical simulation model for a direct power injection (DPI) setup which was used to measure the conducted immunity of a 16-b... To promote the modeling standardization process of the integrated circuits, an improved electrical simulation model for a direct power injection (DPI) setup which was used to measure the conducted immunity of a 16-bit microcontroller to radio frequency aggression was investigated. Based on the existing model of the same microcontroller, the PDN module was modified by adding the core, PLL and MD network models, which could reflect the actual electric distribution situation within the microcontroller more accurately. By comparing the simulation results with the measurement results, the effectiveness of the modified model can be improved to 500 MHz, and its uncertainty is within +1.8 dB (+2 dB is acceptable). Then, to improve the simulation accuracy of the complete model in the high frequency range, the I/O model which contained the dynamic and nonlinear characteristics reflecting the variation of the internal impedance of the microcontroller with increasing the frequency of the external noise was introduced. By comparing the simulation results with the measurement results, the effectiveness of the second modified model can be improved up to 1.4 GHz with the uncertainty of ~1.8 dB. Thus, a conclusion can be reached that the proposed model can be applied to a much wider frequency range with a smaller uncertainty than the latest model of the similar type. Furthermore, associated with the electromagnetic emission testing platform model, the PDN module can also be used to predict the electromagnetic conducted and radiated emission characteristics. This modeling method can also be applied to other integrated circuits, which is very helpful to the standardization of the IC electromagnetic compatibility (EMC) modeling process. 展开更多
关键词 electromagnetic immunity MICROCONTROLLER direct power injection passive distribution network
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Progress of Expert Systems in Electromagnetic Engineering 被引量:1
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作者 赖生建 王秉中 《Journal of Electronic Science and Technology of China》 2005年第4期328-333,共6页
It is urgent to solve various problems in electromagnetic (EM) engineering under the increasingly complicated environment. Some expert systems (ES) come into being just to keep up with the demand for solving these... It is urgent to solve various problems in electromagnetic (EM) engineering under the increasingly complicated environment. Some expert systems (ES) come into being just to keep up with the demand for solving these problems. Combined with the analysis of development orES technology and the development trend of EM engineering software in recent years, the application orES technology in EM engineering is discussed, and especially the progress of complete ES in electromagnetic compatible (EMC) is introduced. 展开更多
关键词 electromagnetic (EM) engineering expert system KNOWLEDGE-BASE engineering software electromagnetic compatible (EMC) electromagnetic interfere(EMI)
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EMS型磁浮列车悬浮静磁场电磁环境仿真研究 被引量:3
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作者 潘强强 逯迈 《中国铁道科学》 EI CAS CSCD 北大核心 2023年第2期102-110,共9页
为量化评估常导电磁悬浮(EMS)型磁浮列车的电磁环境风险,在确定位于磁浮列车悬浮架两侧的直线电机转子励磁线圈为辐射源的基础上,采用有限元软件COMSOL Multiphysics,建立长定子轨道和EMS型磁浮列车三维结构模型,对直线电机的悬浮电磁... 为量化评估常导电磁悬浮(EMS)型磁浮列车的电磁环境风险,在确定位于磁浮列车悬浮架两侧的直线电机转子励磁线圈为辐射源的基础上,采用有限元软件COMSOL Multiphysics,建立长定子轨道和EMS型磁浮列车三维结构模型,对直线电机的悬浮电磁特性以及它在周围空间和磁浮列车车厢内产生的静磁场进行仿真计算,并将车厢内的磁通密度计算结果与静磁场暴露限值标准进行对比。结果表明:长定子直线电机在励磁电流为25 A时,悬浮间隙中心线处磁通密度最大模值约为0.9 T,悬浮电磁力约为19.7 kN·m^(-1);磁浮列车夹层位置处磁通密度最大模值在9.39~53.6 uT范围内,车厢内磁通密度最大模值约为6.93 uT;悬浮励磁线圈在车厢内产生的磁通密度最大值远低于国际非电离辐射防护委员会(ICNIRP)对一般公众推荐的400 mT静磁暴露限值,且满足标准EN 45502-2-1—2003和GB 16174.2—2015中小于1 mT的静磁场暴露控制限值。 展开更多
关键词 ems型磁浮列车 直线电机 静磁场 电磁环境 暴露控制标准
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Reduced technique for modeling electromagnetic immunity on braid shielding cable bundles
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作者 肖培 杜平安 +1 位作者 聂宝林 任丹 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期175-183,共9页
In this paper, an efficient multi-conductor simplification technique is proposed to model the electromagnetic immunity on cable bundles within a braid shielding structure over a large frequency range. By grouping toge... In this paper, an efficient multi-conductor simplification technique is proposed to model the electromagnetic immunity on cable bundles within a braid shielding structure over a large frequency range. By grouping together the conductors based on the knowledge of Z-Smith chart, the required computation time is markedly reduced and the complexity of modeling the completely shielding cable bundles is significantly simplified with a good accuracy. After a brief description of the immunity problems in shielding structure, a six-phase procedure is detailed to generate the geometrical characteristics of the reduced cable bundles. Numerical simulation is carried out by using a commercial software CST to validate the efficiency and advantages of the proposed approach. The research addressed in this paper is considered as a simplified modeling technique for the electromagnetic immunity within a shielding structure. 展开更多
关键词 cable bundles electromagnetic immunity braid shielding structure numerical simulation
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Deep learning-based method for detecting anomalies in electromagnetic environment situation
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作者 Wei-lin Hu Lun-wen Wang +2 位作者 Chuang Peng Ran-gang Zhu Meng-bo Zhang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第8期231-241,共11页
The anomaly detection of electromagnetic environment situation(EMES) has essential reference value for electromagnetic equipment behavior cognition and battlefield threat assessment.In this paper,we proposed a deep le... The anomaly detection of electromagnetic environment situation(EMES) has essential reference value for electromagnetic equipment behavior cognition and battlefield threat assessment.In this paper,we proposed a deep learning-based method for detecting anomalies in EMES to address the problem of relatively low efficiency of electromagnetic environment situation anomaly detection(EMES-AD).Firstly,the convolutional kernel extracts the static features of different regions of the EMES.Secondly,the dynamic features of the region are obtained by using a recurrent neural network(LSTM).Thirdly,the Spatio-temporal features of the region are recovered by using a de-convolutional network and then fused to predict the EMES.The structural similarity algorithm(SSIM) is used to determine whether it is anomalous.We developed the detection framework,de-signed the network parameters,simulated the data sets containing different anomalous types of EMES,and carried out the detection experiments.The experimental results show that the proposed method is effective. 展开更多
关键词 electromagnetic environment situation(EMES) Anomaly detection(AD) Regional features integration LSTM CNN
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基于改进SBR技术的地面目标SAR图像快速生成技术
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作者 单敬喆 曲晓杰 +1 位作者 晁坤 许小剑 《电波科学学报》 CSCD 北大核心 2024年第2期322-331,共10页
传统的弹跳射线(shooting and bouncing ray,SBR)技术主要适用于自由空间目标的电磁散射计算,当用于地面目标与背景复合场景的电磁散射计算和合成孔径雷达(synthetic aperture radar,SAR)图像建模与仿真时,在小擦地角下其计算误差显著... 传统的弹跳射线(shooting and bouncing ray,SBR)技术主要适用于自由空间目标的电磁散射计算,当用于地面目标与背景复合场景的电磁散射计算和合成孔径雷达(synthetic aperture radar,SAR)图像建模与仿真时,在小擦地角下其计算误差显著增大。针对此问题,提出了一种基于“四路径”模型的改进SBR技术,其考虑了目标与邻域地面之间的多次反射效应以及目标与远区地面之间的多径散射效应对地面目标散射回波的影响。首先构建一个尺寸略大于目标包围盒的粗糙地面实体模型;然后结合“镜像法”改进射线追踪技术,分析电磁波在目标各部件间、目标同实体地面之间以及同虚拟半空间分界面之间的射线传播过程;最后结合高频渐近方法完成电磁散射计算。利用精确数值法计算结果对所提出技术进行了验证,并将其应用于地面目标的SAR图像高逼真度仿真,同实测SAR图像比对表明了所提技术具有良好的适用性。 展开更多
关键词 电磁散射 合成孔径雷达(SAR) 地面目标 弹跳射线(SBR)技术 “四路径”模型
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基于电磁超材料的射频能量收集器设计及性能验证 被引量:1
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作者 尉易庆 杨慧敏 《传感器与微系统》 CSCD 北大核心 2024年第1期91-94,98,共5页
设计了一种用于2.45GHz射频(RF)能量收集的超材料能量收集器,为典型的三明治结构,超材料谐振结构为互补开口谐振环(CSRR),介质层选用具有低损耗角正切特性的F4B材质。通过在CSRR的开口处打孔并加载负载电阻,实现了WiFi频段电磁(EM)能量... 设计了一种用于2.45GHz射频(RF)能量收集的超材料能量收集器,为典型的三明治结构,超材料谐振结构为互补开口谐振环(CSRR),介质层选用具有低损耗角正切特性的F4B材质。通过在CSRR的开口处打孔并加载负载电阻,实现了WiFi频段电磁(EM)能量的完美吸收。通过对收集器输入阻抗及多物理场分布的仿真,从不同方面分析了超材料能量收集器的吸波机理。样品的测试结果表明:所设计的超材料能量收集器能够在2.5 GHz达到89.3%的能量收集效率。验证了所设计的超材料谐振结构用于WiFi能量收集的可行性,可用于低功耗消费电子、医疗植入设备、物联网传感器节点等的主要或供电辅助来源。 展开更多
关键词 超材料 能量收集 欧姆损耗 电磁谐振
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人参皂苷Rg3对EMs患者免疫功能的影响 被引量:1
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作者 任艺婷 王莉娜 +1 位作者 常涛 李兆艾 《中国妇幼健康研究》 2013年第3期427-428,440,共3页
目的比较人参皂苷Rg3与孕三烯酮联合手术对Ⅲ~Ⅳ期子宫内膜异位症(EMs)患者免疫功能的影响。方法将100例经腹腔镜手术后Ⅲ~Ⅳ期子宫内膜异位症患者分为两组:研究组50例,口服人参皂苷Rg320mg/次,1次/日,连用3个月;对照组为50... 目的比较人参皂苷Rg3与孕三烯酮联合手术对Ⅲ~Ⅳ期子宫内膜异位症(EMs)患者免疫功能的影响。方法将100例经腹腔镜手术后Ⅲ~Ⅳ期子宫内膜异位症患者分为两组:研究组50例,口服人参皂苷Rg320mg/次,1次/日,连用3个月;对照组为50例,口服孕三烯酮2.5mg/次,2次/周,连用3个月。分别于术后1个月及3个月检测T细胞亚群含量及白介素-6含量。结果研究组血清CD3’、CD3+CD8+、CD4+/CD8+比率在用药治疗1个月及3个月时比术前明显上升,与对照纽相比差异有统计学意义(F值分别为15.877、6.437、4.227、51.956、42.366、32.788,均P〈0.05)。研究组血清CD3+CD4+比率及白介素-6在用药治疗1个月及3个月时比术前明显下降,与对照组相比差异有统计学意义(F值分别为19.289、39.197、6.383、147.432,均P〈0.05)。结论人参皂苷Rg3对改善子宫内膜异位症患者的免疫功能较孕三烯酮明显,是临床上子宫内膜异位症患者手术后的辅助药物。 展开更多
关键词 子宫内膜异位症 人参皂苷RG3 孕三烯酮 免疫
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基于平行双线结构的低频场发生器设计
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作者 陈亮凡 吴钟杰 +1 位作者 赵李刚 王正斌 《电波科学学报》 CSCD 北大核心 2024年第1期167-172,共6页
针对电磁辐射抗扰度测试天线在低频时辐射效率低、体积大、难以生成高电场强度的问题,设计了一款平行双线传输线电场发生器。该场发生器输入端使用阻抗比为1∶4的传输线变压器巴伦,实现了输入端与负载的阻抗匹配,以及非平衡端转化为平衡... 针对电磁辐射抗扰度测试天线在低频时辐射效率低、体积大、难以生成高电场强度的问题,设计了一款平行双线传输线电场发生器。该场发生器输入端使用阻抗比为1∶4的传输线变压器巴伦,实现了输入端与负载的阻抗匹配,以及非平衡端转化为平衡端;为保证场发生器电气性能的稳定性和可靠性,平行双线传输线采用直径为100 mm的铜管,负载采用耐大功率的无感陶磁电阻,能够承受2 500 W的连续波输入功率。实验结果显示该场发生器在10 kHz~100 MHz的频率范围内电压驻波比均小于1.9,在距场发生器中心0.5 m远处可产生高达200 V/m的电场强度,在1 m远处可产生50~100 V/m的场强。该电场发生器可旋转改变电极化方向,具有覆盖范围广、场强分布均匀、场强幅度高的特点,广泛应用于低频辐射抗扰度测试。 展开更多
关键词 电场发生器 传输线变压器 大功率 宽带 电磁兼容 辐射抗扰度
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Electromagnetic characteristic analysis and design of a linear motor used for ultra-high-speed EMS maglev train
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作者 GAO Han SHI TingNa +4 位作者 GAO XinMai LEI YanXiao YAN Dong GUO LiYan YAN Yan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第6期1957-1973,共17页
The operating speed of the commercial electromagnetic suspension(EMS)maglev train has been over 430 km/h,making it the fastest means of land transportation.With the increasing demands of people traveling,it is necessa... The operating speed of the commercial electromagnetic suspension(EMS)maglev train has been over 430 km/h,making it the fastest means of land transportation.With the increasing demands of people traveling,it is necessary to further improve the operating speed of maglev trains.Aiming to examine whether the existing EMS system can meet the requirements of ultra-highspeed operation(more than 600 km/h),the electromagnetic characteristics of an EMS linear motor under the operating speed of 600–1000 km/h fed by a square-wave voltage supply is investigated in this article.First,an electromagnetic field model of the EMS system under the square-wave voltage supply is established to investigate its electromagnetic performance,e.g.,the characteristics of phase current,the magnetic flux density,and the electromagnetic force.Second,the relationship between the harmonic components of the air-gap magnetic flux density and electromagnetic force is investigated using the two-dimensional fast Fourier transform(2D-FFT)to reveal the mechanism of electromagnetic force ripple.Third,to address the issues of excessive armature current density and significant electromagnetic force ripple,the linear motor is re-designed by enlarging the stator slot area and reshaping the mover's main magnetic poles.Furthermore,the Taguchi method is used to further improve the electromagnetic characteristics of the linear electric motor.Finally,the effectiveness of the proposed optimal design is validated by the finite-element analysis(FEA)based co-simulation. 展开更多
关键词 ultra-high-speed maglev transportation electromagnetic suspension(ems) linear motor electromagnetic force ripple suppression
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Biological perspectives in geotechnics:Application and monitoring
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作者 Partha Narayan Mishra Surabhi Jain +9 位作者 Thierry Bore Ilhan Chang Yeong-Man Kwon Yijie Wang Hirak Ranjan Dash Ashutosh Kumar Satyam Tiwari Ningjun Jiang Sarat Kumar Das Alexander Scheuermann 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2854-2878,共25页
This paper builds on exploring the applications of biomediated pathways to solve geotechnical challenges.First,the state of the art of biological remediation strategies including microbial remediation and phytoremedia... This paper builds on exploring the applications of biomediated pathways to solve geotechnical challenges.First,the state of the art of biological remediation strategies including microbial remediation and phytoremediation have been introduced and critically reviewed in the context of decontaminating the soils.Next,biopolymerisation,biomineralisation and bioneutralisation processes have been depicted with a special emphasis on the applications including but not limited to soil stabilisation,soil erosion prevention,anti-desertification and pH neutralisation.Each of these methods have their own limitations and bottlenecks while scaling up,and these challenges have been summarised and some possible paths to overcome the challenges have also been discussed.The state of the art of electromagnetic(EM)monitoring methods to capture the effects of biomediation on spatio-temporal soil properties are then highlighted as a non-invasive and rapid pathway to track the progress of biomediated soil processes.Finally,each of the technologies discussed have been evaluated for their maturity level using the principles of technology readiness level(TRL).A majority of the technologies amounting to around 77%are still in the TRL 4e7,i.e.in the valley of death.It is thus evident that development of these technologies needs to be supported with appropriate funding for improving their maturity to a level of industrial deployment. 展开更多
关键词 Biogeotechnics BIOREMEDIATION PHYTOREMEDIATION Biopolymers BIOMINERALISATION electromagnetic(EM)methods technology readiness level(TRL)
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IC静电放电瞬态场测试系统校准方法探讨
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作者 张成 吕刚 +1 位作者 陈彦 强晓霄 《电子产品可靠性与环境试验》 2024年第3期90-93,共4页
随着集成电路的集成度呈几何级数增长和高分子材料的广泛应用,集成电路静电放电(ESD)危害越发严重。据估计,仅美国每年因此造成的损失就高达100亿美元。为了降低研发成本、减少周期时长,把电磁兼容(EMC)测试提前到了集成电路阶段进行,... 随着集成电路的集成度呈几何级数增长和高分子材料的广泛应用,集成电路静电放电(ESD)危害越发严重。据估计,仅美国每年因此造成的损失就高达100亿美元。为了降低研发成本、减少周期时长,把电磁兼容(EMC)测试提前到了集成电路阶段进行,各测试仪器开发商研发了多种ESD瞬态场抗扰度测试系统,因其具有设备小巧、价格便宜、操作简单等优点而受到热捧,但相关的计量校准研究很少。介绍了测试系统的工作原理,提出采用标准传感器和矢量网络分析仪测量瞬态电磁场强度的校准方案。详细论述了校准原理和参数计算方法,并进行了校准验证,测量结果重复性最好可达0.3 dB。 展开更多
关键词 校准 集成电路 电磁兼容 静电放电 瞬态场 抗扰度
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EMS频率对应电能表计量误差值精确测量的方法 被引量:2
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作者 赵波 封志明 陈道升 《上海计量测试》 2011年第2期18-20,共3页
针对目前电能表EMS试验中人工干预过多、驻留时间无法确定等问题,提出一种与EMS频率相对应的电能表计量误差值精确测量的方法。利用该方法可使EMS频率点与电能表计量误差值一一匹配,同时可动态设置驻留时间,提高测量数据的精确性和测量... 针对目前电能表EMS试验中人工干预过多、驻留时间无法确定等问题,提出一种与EMS频率相对应的电能表计量误差值精确测量的方法。利用该方法可使EMS频率点与电能表计量误差值一一匹配,同时可动态设置驻留时间,提高测量数据的精确性和测量速度,并以实例说明该方法的有效性。 展开更多
关键词 电能表计量误差 电磁抗扰度(ems) 自动检测
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EMS测试系统中的主要设备选型 被引量:1
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作者 王建 刘志珍 王锋 《电子质量》 2010年第2期12-13,16,共3页
结合标准和实际测试对EMS测试设备的要求,分别对射频电磁场辐射抗扰度和传导骚扰抗扰度测试系统的主要设备技术指标要求和选型,进行了详细阐述和分析,为如何选择满足用户要求的测试系统提供参考。
关键词 电磁敏感度 电磁抗扰度 传导骚扰 设备
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复合磁场作用下板坯结晶器内钢液流动、传热与凝固的数值模拟
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作者 韦忍 苏志坚 +1 位作者 杜以达 王燕斌 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第4期514-522,共9页
为利用板坯连铸过程中电磁搅拌技术和电磁制动技术各自的优点克服自身缺点,本文应用了结合电磁搅拌和电磁制动的分体式复合磁场并提出电磁制动的结构为单条型电磁制动,对板坯连铸结晶器流场和温度场进行控制.建立了该磁场下结晶器内钢... 为利用板坯连铸过程中电磁搅拌技术和电磁制动技术各自的优点克服自身缺点,本文应用了结合电磁搅拌和电磁制动的分体式复合磁场并提出电磁制动的结构为单条型电磁制动,对板坯连铸结晶器流场和温度场进行控制.建立了该磁场下结晶器内钢液流动、传热、凝固耦合的三维数值模拟模型.对复合磁场给予结晶器内钢液流动及传热与凝固的影响进行了分析.结果表明:施加复合磁场后,结晶器内上、下返流流速明显减小,钢液主流股对窄面的冲击深度变小,上返流整体下移,弯月面钢液形成顺时针循环流;结晶器内整体温度分布更均匀,弯月面处温度较无磁场时基本不变;结晶器出口处凝固坯壳更为均匀,其厚度较无磁场下有所增加,钢液射流对窄面附近初生坯壳冲刷程度减小. 展开更多
关键词 板坯连铸结晶器 电磁搅拌 电磁制动 传热 数值模拟
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工业智能仪器仪表电磁兼容技术研究
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作者 俞磊 《自动化仪表》 CAS 2024年第9期110-114,120,共6页
日趋智能化、网络化和集成化的自动化仪表与控制系统的电磁兼容现象和问题正得到更多的关注和重视,而仪器仪表面临的电磁环境也越来越复杂。因此,电磁兼容创新性研究尤为重要。通过对工业智能仪器仪表的应用场景分析,以及相关仪器仪表... 日趋智能化、网络化和集成化的自动化仪表与控制系统的电磁兼容现象和问题正得到更多的关注和重视,而仪器仪表面临的电磁环境也越来越复杂。因此,电磁兼容创新性研究尤为重要。通过对工业智能仪器仪表的应用场景分析,以及相关仪器仪表电磁兼容现象产生机理的研究,根据相关电磁兼容试验的结果,提出了针对于工业智能仪器仪表的电磁兼容防护措施。通过电磁环境模拟、电磁兼容试验室定量测试等方法,验证电磁兼容防护措施的有效性。该研究可有效提升工业智能仪器仪表的性能和可靠性,确保仪器仪表在复杂的电磁环境中的稳定运行。 展开更多
关键词 工业智能仪器仪表 电磁兼容性 电磁发射 电磁环境 电磁抗扰度 电磁防护措施
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Application of geophysical methods in fine detection of urban concealed karst:A case study of Wuhan City,China
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作者 Dao-han Liu Lei Wang +3 位作者 Lei Liu Jun-jie Xu Jian-qiang Wu Pan Liu 《China Geology》 CAS CSCD 2024年第3期517-532,共16页
The construction of modern livable cities faces challenges in karst areas,including ground collapse and engineering problems.Wuhan,with a population of 13.74×10^(6) and approximately 1161 km^(2)of soluble rocks i... The construction of modern livable cities faces challenges in karst areas,including ground collapse and engineering problems.Wuhan,with a population of 13.74×10^(6) and approximately 1161 km^(2)of soluble rocks in the urban area of 8569.15 km^(2),predominantly consists of concealed karst areas where occasional ground collapse events occur,posing significant threats to underground engineering projects.To address these challenges,a comprehensive geological survey was conducted in Wuhan,focusing on major karstrelated issues.Geophysical methods offer advantages over drilling in detecting concealed karst areas due to their efficiency,non-destructiveness,and flexibility.This paper reviewed the karst geological characteristics in Wuhan and the geophysical exploration methods for karst,selected eight effective geophysical methods for field experimentation,evaluated their suitability,and proposed method combinations for different karst scenarios.The results show that different geophysical methods have varying applicability for karst detection in Wuhan,and combining multiple methods enhances detection effectiveness.The specific recommendations for method combinations provided in this study serve as a valuable reference for karst detection in Wuhan. 展开更多
关键词 Ground Penetrating Radar(GPR) Electric Resistivity Tomography(ERT) Opposing-coils Transient electromagnetic Method(OCTEM) Microtremor Array Measurements(MAM) Multi-channel Analysis of surface wave(MASW) Multi-source surface wave exploration(MSSW) electromagnetic wave CT(EM CT) Surface Nuclear Magnetic Resonance(SNMR) Concealed karst Urban geological survey engineering
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电磁兼容仪器的核查方法研究 被引量:1
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作者 魏伟 《仪器仪表用户》 2024年第6期16-18,共3页
本文主要研究了试验仪器选用和期间核查方法。首先介绍了电磁兼容基础知识,包括电磁兼容的概念、特性以及干扰形式与影响,以及电磁兼容设计的原则。然后详细介绍了电磁兼容试验仪器的种类与特性,并探讨了其选用、操作、维护与校验的相... 本文主要研究了试验仪器选用和期间核查方法。首先介绍了电磁兼容基础知识,包括电磁兼容的概念、特性以及干扰形式与影响,以及电磁兼容设计的原则。然后详细介绍了电磁兼容试验仪器的种类与特性,并探讨了其选用、操作、维护与校验的相关内容。接着,提出了电磁兼容试验过程中的核查重要性与方法,并列举了试验过程中的重点核查项目。最后,总结了本研究的主要成果,并展望了未来的研究方向。 展开更多
关键词 实验室仪器 电磁兼容 发射和抗扰度 期间核查 稳定性
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