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本文介绍了电磁干扰和电磁兼容的基本概念,对电磁干扰的成因、耦合途径进行了分析。给出了防止干扰、实现电磁兼容的方法及在通信中的应用。 相似文献
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分析了互连电缆的电磁干扰机理,建立了多导体互连线串扰耦合数学模型;运用有限元分析软件Ansys提取了矿用四芯电缆互联线的电容矩阵和电感矩阵;应用场路结合的方法对电子设备互连电缆进行电磁干扰预测分析,得到了与理论分析相一致的数值计算结果。 相似文献
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为抑制火药压伸成型控制系统中的电磁干扰,提出了一种有效的抗干扰解决方案.根据电磁干扰的三要素,对火药压伸成型控制系统中的电磁干扰源、耦合路径及敏感设备等方面进行分析,主要研究了变频器谐波干扰的产生机理和主要传播路径.在此基础上,综合利用滤波、接地、屏蔽和隔离等硬件抗干扰技术设计了合理有效的抗干扰方案.实验结果表明,该方案有效地提高了系统的稳定性和安全性,实现了火药压伸成型控制系统的电磁兼容. 相似文献
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计算机的电磁干扰研究 总被引:8,自引:0,他引:8
李海泉 《计算机自动测量与控制》2001,9(6):1-3,6
较全面地阐述了来自外部的和内部的电磁干扰形式及其影响,讨论了干扰的耦合方式,分析了计算机工程中常用的干扰抑制和隔离方法,提出了一种较理想的供电、接地和避雷的电磁兼容系统方案,可供有关方面参考。 相似文献
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计算机的电磁干扰研究 总被引:1,自引:1,他引:0
李海泉 《计算机测量与控制》2001,9(6):1-3
较全面地阐述了来自外部的和内部的电磁干扰形式及其影响 ,讨论了干扰的耦合方式 ,分析了计算机工程中常用的干扰抑制和隔离方法 ,提出了一种较理想的供电、接地和避雷的电磁兼容系统方案 ,可供有关方面参考。 相似文献
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由于光纤优良的抗电磁干扰能力、低损耗等特点,使光纤CAN网络在微波加热等复杂工业环境中得到越来越广泛的应用。在分析了CAN总线通信协议和光纤媒介拓扑结构的基础上,提出了一种基于LPC2292微控制器的光纤CAN环形网络的设计方案。采用光收发一体模块和2X2光分路器相结合的方式,设计了相应的接口电路和CAN控制器软件,并根据信号衰减和延时计算出网络可容纳的最大节点数。通过3个节点的光纤CAN环网实验,验证了该网络设计方案的有效性。 相似文献
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This article presents and discusses a unifying simulation procedure aimed at providing more realistic performance prediction of basic imaging systems, combining 3D EM (3 Dimensions Electro‐Magnetic) simulations and nonlinear receiver circuit simulation. New methods are proposed to emulate the radiated emissivity profile of a target body and to use harmonic balance simulation to emulate nonlinear circuit/system response to a broadband noisy stimulus. The procedure focuses mainly on passive imaging, but active imaging including illuminated passive imaging is dealt with and some elemental experiments are presented and discussed for comparisons. The method enables the extrapolation of the frequency response of a single pixel detector to an array with more elements suitable for providing a complete set of pixels and can help in evaluating the most suitable bandwidth according to the operation mode (passive/active), frequency range of operation, desired resolution, and the pixel number‐image resolution tradeoff. 相似文献
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电液伺服加载广泛用于航空工业中模拟飞行器的气动力.对于运动加载进行了大量的研究,但在实践中,还不能有效地解决多余力问题,因为舵机系统在加载系统的输出加入了强干扰.与一般从外部引入信号消除多余力方法不同,提出一种通过内部反馈减少多余力的新控制方法,可测量的内部反馈信号补偿伺服阀的流量变化,从而消除了加载系统跟踪的滞后,反馈以后,强耦合效应已不是主要的问题,舵机运动的速度干扰多余力消除了.通过模型仿真进行了验证.文章结论:运动加载中,内部反馈能够消除多余力,具有一般的适用性,工程实现上,反馈函数简单,反馈信号可以在实际中测量到. 相似文献
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针对地球物理勘探中高精度磁场测量以及远距离数据同步的需求,本文基于低温超导量子干涉仪和图形化系统开发平台构建了一种可通过GPS同步的新型磁力仪,并可采用简便的直读方式进行磁场测量.首先介绍了新型低温超导磁力仪的工作原理,并重点阐述了由其程控直读电路以及软硬件设计方案;然后在分析影响超导磁力仪数据同步因素的基础上,给出了GPS同步实现及其同步精度标定的方法;最后在良好的磁屏蔽环境中对超导磁力仪的性能以及电磁兼容进行了评估,并对影响其同步的相关因素进行了测试和标定,试验表明传感器的本底噪声约为6 fT/ Hz@1 kHz,数据同步精度可达1 ms,满足实用要求. 相似文献
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A novel, completely transparent bio-MEMS (bio-Micro Electro Mechanical System) device has been devised and manufactured using finite element analysis (FEA) and micro-fabrication techniques. The device has been designed to be used for testing the mechanical properties of single living cells, it is versatile and suitable for coupling with other analysis techniques. Furthermore, being completely transparent, it can be used with either transmission or reflection microscopes. The transparent bio-MEMS is based on a silicon dioxide?Csilicon nitride structure and, since the main goal is to test living cells, it is meant to work in a liquid environment and allow for cell stretching. Sensors for cell deformation and for platform displacement are also present and the required sensitivity for single cell analyses is granted. The device will moreover allow the recording of the stress?Cstrain curve for single living cells. 相似文献
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Ultra‐compact dual mode dual band filter based on separate electric and magnetic coupling paths
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A pair of dual mode independent controllable resonators used to realize dual band pass filter with good frequency selectivity and isolation is presented. The resonators are directly connected to input/output and are coupled through electric and magnetic coupling in two different paths. Magnetic coupling between the resonators is achieved using a common grounded via‐hole between the two set of quarter‐wavelength resonators. Electric coupling is achieved through open edge coupling of the resonators. Two independent resonators with Separate Electric and Magnetic Coupling (SEMC) paths produce an independently controllable dual band filter response and also additional transmission zeros (TZs) at the edges of the pass bands. The TZs are introduced to improve the selectivity of the filter. Filter exhibits desired pass band response at the Universal Mobile Telecommunications System (UMTS) band (1.95‐2.2 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) band (3.4‐3.6 GHz). Proposed compact filter is implemented on RT/Duroid 5880 (εr = 2.2) substrate with thickness of 0.785 mm and surface area of 15 × 12 sq. mm. 相似文献