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交直流电弧炉的用电比较及电磁干扰解决措施
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作者 赵作宝 《电力需求侧管理》 2003年第2期53-54,共2页
关键词 交直流电弧炉 供电负荷 电磁干抗 炼钢炉
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A novel approach to conductive EMI noise source modeling 被引量:1
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作者 邱晓晖 赵阳 +2 位作者 谢少军 褚家美 姜宁秋 《Journal of Southeast University(English Edition)》 EI CAS 2009年第2期161-166,共6页
A new approach to conductive electromagnetic interference (EMI) noise source modeling, i. e. the source internal impedance extraction, is presented. First, the impedance magnitude is achieved through an exciting pro... A new approach to conductive electromagnetic interference (EMI) noise source modeling, i. e. the source internal impedance extraction, is presented. First, the impedance magnitude is achieved through an exciting probe and a detecting probe, or through calculations based on insertion loss measurement results when inserting a series nigh-value known impedance or a shunt low-value known impedance in the circuit. Then the impedance phase is extracted by the Hilbert transform (HT) of the logarithm of the obtained impedance magnitude. Performance studies show that the estimated phase error can increase greatly at a zero frequency in the Hilbert transform because of the existence of a singular point, and this effect can be eliminated by introducing a zero-point when the noise source does not include a series-connected capacitive component. It is also found that when the frequency is nigher than 150 kHz, the estimated phase error is not sensitive to the inductive source but sensitive to the capacitive source. Finally, under the conditions of the same measurement accuracies for impedance magnitude, the accuracy of complex impedance based on the HT can be improved about 10 times when compared with the accuracy of estimated parameters based on the impedance magnitude fitting method (IMFM). 展开更多
关键词 noise source modeling impedance estimation electromagnetic interference
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用现场总线实现高清生产线的高效灵活生产
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作者 郑震宇 《电气时代》 2005年第8期66-67,共2页
PROFIBUS-DP使用是基于RS485标准的物理层,是一个两线差分系统,具有极好的抗电磁干扰性能,通常采用主-从方式工作,通信速率9.6Kbit/s~12Mbit/s,扫描1000个I/O点时间少于1ms,一个系统最多可以有126个节点,数千个模拟量和数字量,但若无... PROFIBUS-DP使用是基于RS485标准的物理层,是一个两线差分系统,具有极好的抗电磁干扰性能,通常采用主-从方式工作,通信速率9.6Kbit/s~12Mbit/s,扫描1000个I/O点时间少于1ms,一个系统最多可以有126个节点,数千个模拟量和数字量,但若无中继器的每一段最多32个节点。 展开更多
关键词 现场总线 生产线 PROFIBUS 差分系统 RS485 通信速率 电磁干抗 I/O点 物理层
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解决让电脑别再“尖叫”——电脑“啸叫”故障
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作者 清竹 《微型计算机》 北大核心 2003年第23期99-99,共1页
笔者1998年买的兼容机最近出现问题,使用一段时间,音箱会发出剌耳的“啸叫”声。众所周知,音箱发出“啸叫”声的原因可分为两个方面:
关键词 计算机 “啸叫”故障 音箱故障 声卡 滤波电容 电磁干抗
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Application of pseudo-random frequency domain electromagnetic method in mining areas with strong interferences 被引量:7
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作者 Yan-fang HU Di-quan LI +2 位作者 Bo YUAN Guang-yun SUO Zi-jie LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期774-788,共15页
Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagneti... Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagnetic method(WFEM),in which the pseudo-random signal is taken as the transmitter source,can extract high quality resistivity data in areas with sever interference by only measuring the electric field component.We use the WFEM to extract the resistivity information of the Dongguashan mine in southeast China.Compared with the audio magnetotelluric(AMT)method,and the controlled source audio-frequency magnetotelluric(CSAMT) method,the WFEM can obtain data with higher quality and simpler operations.The inversion results indicate that the WFEM can accurately identify the location of the main ore-body,which can be used for deep mine exploration in areas with strong interference. 展开更多
关键词 pseudo-random signal frequency domain electromagnetic method wide field electromagnetic method(WFEM) strong interference anti-interference capability Dongguashan copper deposit
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Formation and characterization of self-lubricated carbide layer on AA6082 Al-Mg-Si aluminum alloy by electrical discharge alloying process 被引量:1
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作者 Wang-Chih CHEN Hung-Mao LIN Jun-Yen UAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3205-3218,共14页
The surface modification on the AA6082 Al?Mg?Si aging-hardenable aluminum alloy was investigated by electricaldischarge alloying (EDA) process. Kerosene, used as a dielectric fluid, was pyrolytically decomposed into c... The surface modification on the AA6082 Al?Mg?Si aging-hardenable aluminum alloy was investigated by electricaldischarge alloying (EDA) process. Kerosene, used as a dielectric fluid, was pyrolytically decomposed into carbon for the formationof a self-lubricated carbide layer on the aluminum alloy surface during EDA process. Transmission electron microscopy (TEM)image found that the self-lubricated carbide layer was a multi-phase material with carbides and graphite. As a result, theEDA-modified aluminum alloy had a negligible wear rate of ~2?10?4 mg/m (c. f. ~1.1?10?2 mg/m for aluminum alloy substrate).Notably, a new characteristic was found that the EDA-processed carbide layer was a soft magnet, which improved theelectromagnetic interference (EMI) shielding performance of the alloy. 展开更多
关键词 Al-Mg-Si aluminum alloy surface modification electrical discharge alloying SELF-LUBRICATING pyrolytic carbon electromagnetic interference shielding
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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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Application of Optical Fiber in Radiation Detection Systems 被引量:1
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作者 Francisco Antonio Brandao Junior Antonella Lombardi Costa Amo Heeren de Oliveira 《Journal of Chemistry and Chemical Engineering》 2016年第3期120-127,共8页
In the last years, the production of optical fibers cables has made possible the development of a range of spectroscopic probes for in situ analysis performing beyond nondestructive tests, environmental monitoring, se... In the last years, the production of optical fibers cables has made possible the development of a range of spectroscopic probes for in situ analysis performing beyond nondestructive tests, environmental monitoring, security investigation, application in radiotherapy for dose monitoring, verification and validation. In this work, a system using an optical fiber cable to electromagnetic signal transmission from a NaI(TI) radiation detector is presented. The innovative device takes advantage mainly of the optical fibers large passband, small signal attenuation and immunity to electromagnetic interference to application for radiation detection systems. The main aim was to simplify the detection system making it to reach areas where the conventional device cannot access due to its lack of mobility and external dimensions. Some tests with this innovative system are presented and the results stimulate the continuity of the researches. 展开更多
关键词 NaI(T1) optical fiber radiation detection scintillator
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EFT/B interference transmission model and method of anti-interference in a coal mine monitoring substation 被引量:2
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作者 MA Fengying 《Mining Science and Technology》 EI CAS 2010年第3期391-394,399,共5页
Coal mining monitoring system has been enforcing tests for the immunity of Electromagnetic Compatibility(EMC) since 2006.However,not all monitoring substations can pass the Electrical Fast Transient/Burst(EFT/B) immun... Coal mining monitoring system has been enforcing tests for the immunity of Electromagnetic Compatibility(EMC) since 2006.However,not all monitoring substations can pass the Electrical Fast Transient/Burst(EFT/B) immunity test and the explosion-proof test simultaneously.In order to enhance EMC,the EFT/B interfere transmission model was presented at the substation power port,after the EFT/B test method was used to analyze the monitoring substation power ports.Hence,a low-pass filter was designed by using the simulation software PIPICE and an anti-jamming method was proposed by way of a parallel connection of the discharge interfere circuit and the low-pass filter.The improved complex EMI filter was made up of an interference discharge device and a filter.The dynamic equivalent circuit was proposed for the EFT/B immunity test.As a result,the monitoring substation has passed the EFT/B immunity and explosion-proof tests with the complex filter.It is concluded that the complex EMI filter has significantly enhanced the immunity of the coal mining monitoring system. 展开更多
关键词 coal mining monitoring system EXPLOSION-PROOF electrical fast transient/burst complex filter
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金属网的屏蔽效能试验及分析研究 被引量:3
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作者 刘涤尘 《武汉水利电力大学学报》 CSCD 1996年第4期69-74,共6页
采用不同频率的稳态场和单次变化的瞬态场对4种材料11种不同规格的金属网进行了屏蔽效能的测试比较,其试验结果对于具有敏感的集成电路芯片的电子装置和计算机的电磁防护研究。
关键词 屏蔽 金属网 电磁干抗 试验
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