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2019 ESA Workshop on Aerospace EMC (Aerospace EMC)最新文献

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EMC Investigations on Ethernet Link for Avionic Application 航空电子应用中以太网链路的电磁兼容研究
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788936
R. Perraud, C. Marot, G. Martins, V. Kretzschmar, B. Theillaumas, J. Sperandio
This paper presents part of an Airbus research study on the possibility to integrate in near future high speed communications onboard such as 100BaseT1, a 100Mb/s physical layer, quite well known in automotive industry. Significant improvements could be achieved with such technology: easier system installation, weight and cost savings, … But as environmental conditions are quite different in aeronautics, a deep study has been launched to assess the performances of this new physical layer and especially regarding electromagnetic environment. A focus is given here for conducted emissions, conducted immunity and crosstalk. Many combinations of lengths, transceivers and lighting protections were assessed during measurements. For the alien crosstalk, a simulation analysis is presented.
本文介绍了空中客车公司一项关于在不久的将来将100BaseT1 (100Mb/s物理层,在汽车行业非常有名)等高速通信集成到机载的可能性的研究的一部分。这种技术可以实现显著的改进:更容易的系统安装,重量和成本的节省,但由于环境条件在航空领域有很大的不同,一项深入的研究已经开始评估这种新的物理层的性能,特别是在电磁环境下。重点讨论了传导辐射、传导抗扰和串扰。在测量期间,对长度、收发器和照明保护的许多组合进行了评估。针对异形串声,进行了仿真分析。
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引用次数: 0
High-Frequency Electromagnetic Coupling Calculation Using the Dynamical Energy Analysis by Discrete Flow Method 离散流法动态能量分析高频电磁耦合计算
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788963
S. Phang, Shukai Ma, S. Creagh, G. Gradoni, S. Anlage, David W. P. Thomas, T. Antonsen, G. Tanner
We introduce the Dynamical Energy Analysis (DEA) as a method to calculate high-frequency electromagnetic radiation inside a complex geometry which is not-restricted to either weak-coupling between sub-cavities or weak-damping limitation. A comparison between the results obtained using DEA and Power Balance (PWB) methods shows that, while the PWB method is sufficiently accurate in the weak-damping limit, this is not the case when damping is strong. The DEA approach may therefore be more applicable to conditions such as a fully manned cabin or other practical situations in the aerospace sector.
本文介绍了一种不受子腔间弱耦合和弱阻尼限制的复杂几何结构内高频电磁辐射的动态能量分析方法。将DEA和功率平衡(PWB)方法的结果进行比较,结果表明,虽然PWB方法在弱阻尼极限下具有足够的精度,但在强阻尼极限下则不具有足够的精度。因此,DEA方法可能更适用于全载人舱或航空航天部门的其他实际情况。
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引用次数: 1
Scattering interference from large spacecraft and causal effects on launch vehicle antenna performance 大型航天器散射干扰及其对运载火箭天线性能的影响
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8844189
P. Edwards, W. Jones
In this work, we investigate after the performance of an S-band, circularly polarized patch antenna installed on a Launch Vehicle (LV) compromised by the launching spacecraft structure and the unpredicted loss of critical telemetry. During any space launch, on-board Radio Frequency (RF) Telemetry, Tracking & Command (TT&C) systems must satisfy RF link requirements for monitoring of launch vehicle system health, and trajectory tracking for launch range safety. Preprogrammed flight manoeuvres attempt to provide best line-of-sight (LOS) visibility to scheduled receiving satellite and ground stations along the launch trajectory path. Traditional link margin analysis conservatively predicts telemetry margin using measured element radiation patterns for scheduled stations that are in the view. Using advanced computational electromagnetic modelling methods, the compromised radiation pattern is investigated and the causal effect on LV telemetry performance is discussed after the fact without the need for integrated system testing.
在这项工作中,我们研究了安装在运载火箭(LV)上的s波段圆极化贴片天线的性能,该天线受到发射航天器结构和关键遥测的不可预测损失的影响。在任何空间发射过程中,机载射频(RF)遥测、跟踪和指挥(TT&C)系统必须满足射频链路要求,以监测运载火箭系统的健康状况,并对发射范围的安全进行轨迹跟踪。预编程飞行演习试图提供最佳的视线(LOS)能见度预定接收卫星和地面站沿发射轨迹路径。传统的链路余量分析保守地预测遥测余量使用测量元素辐射模式的预定站在视图中。采用先进的计算电磁建模方法,在不需要进行集成系统测试的情况下,研究了受损的辐射方向图,并在事后讨论了对低压遥测性能的因果影响。
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引用次数: 0
Decoupling of Ground Plane Effect on Low Frequency Magnetic and Electric Field Measurements & Modeling 地平面解耦对低频磁场和电场测量及建模的影响
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788906
E. G. Chatzineofytou, S. Spantideas, C. D. Nikolopoulos, A. T. Baklezos, I. Marziali, M. Nicoletto, D. Boschetti, Christos N. Capsalis
In the present work, the theory of image sources is employed to account for the contribution of the ground plane in low frequency electric and magnetic field measurements. The developed method targets at estimating a dipole model source from the near field measurements of an Equipment Under Test (EUT), taking into consideration its image source(s) due to the presence of a ground plane. For the evaluation of the proposed approach, the electric and magnetic field emissions generated by a-priori known sources are captured and the respective models are predicted using the spectral field values. The present study and the verification measurements have been carried out in the frame of ESA's study on Pre-Verification of THOR Electro-Magnetic Cleanliness Approach.
在本工作中,采用像源理论来解释地平面在低频电场和磁场测量中的贡献。所开发的方法旨在从被测设备(EUT)的近场测量中估计偶极子模型源,同时考虑到由于地平面的存在而产生的图像源。为了评估所提出的方法,捕获了先验已知源产生的电场和磁场发射,并使用光谱场值预测了各自的模型。本研究和验证测量是在ESA的THOR电磁洁净度方法预验证研究框架下进行的。
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引用次数: 1
Towards a Magnetically Clean Reaction Wheel with Active Magnetic Field Mitigation 一种具有主动磁场缓解的磁清洁反应轮
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788947
A. Nicolai, S. Stoltz, O. Hillenmaier, J. Ludwig, C. Strauch, D. Grivon, L. Rossini, E. Onillon, T. Hellwig, S. Scheiding
This paper describes the necessary steps and mitigation techniques to minimize the magnetic field of a reaction wheel. Stringent magnetic emission requirements resulted in the design of an active compensation system to counteract the changing wheel magnetic field. The motor emissions are measured for different operational modes and are modelled according to these measurements. The opposite field is then applied to the active compensation. The paper will discuss feasibility and challenges of the approach as well as other magnetic field mitigation strategies employed in the design. Findings from the Breadboard tests will be discussed and the magnetically clean design will be presented.
本文介绍了减少反力轮磁场的必要步骤和缓解技术。严格的磁发射要求导致了主动补偿系统的设计,以抵消变化的车轮磁场。电机排放测量不同的操作模式,并根据这些测量建立模型。然后将相反场应用于主动补偿。本文将讨论该方法的可行性和挑战,以及设计中采用的其他磁场缓解策略。将讨论面包板测试的结果,并介绍磁清洁设计。
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引用次数: 7
Ways of Improvement for HIRF Transfer Function Assessment on Rotorcraft 旋翼机HIRF传递函数评估改进方法
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788908
C. Bastard, M. Meyer, C. Guiffaut, A. Reineix
According to the rotorcraft certification requirements, the helicopters must withstand High Intensity Radiated Field. The certification substantiation partly relies on the elaboration of transfer functions based on modeling results and therefore on the precision of the numeric model. The limitation of the state of the art modeling approach is pointed out and some ways of improvement are proposed in order to prevent the overestimation of the transfer functions. The modification's benefits of the model are confirmed by the comparison between models and experimental results.
根据旋翼机认证要求,直升机必须承受高强度辐射场。证明的依据部分依赖于基于建模结果的传递函数的阐述,因此依赖于数值模型的精度。指出了现有建模方法的局限性,并提出了一些改进方法,以防止传递函数的高估。通过模型与实验结果的对比,验证了模型修正的有效性。
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引用次数: 3
Transmission Factor Measurement Based Impedance Characterisation Utilising a Double Current Probe Assembly 基于传输系数测量的阻抗特性利用双电流探头组件
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788922
M. Harm, O. Kerfin
For efficiency reasons the power electronic devices of future aircrafts will be most likely equipped with fast switching semiconductors which will be challenging in terms of EMC compliance. The knowledge of the high frequency behaviour of the implemented system components would support innovative and also efficient EMI suppression techniques. Calibrated impedance probes can be used to examine the HF properties of built-in devices contactlessly. However DC or low frequency currents lead to saturation effects in the impedance probe's core, which distorts the measurement results. In this contribution two classic EMC current probes in combination with an in-situ calibration technique are utilised to perform contactless impedance measurements in the presence of DC bias currents.
出于效率原因,未来飞机的电力电子设备很可能配备快速开关半导体,这在EMC合规方面将具有挑战性。所实施的系统组件的高频行为的知识将支持创新和高效的EMI抑制技术。校准后的阻抗探头可用于检测内置器件的非接触高频特性。然而,直流或低频电流会导致阻抗探头芯部的饱和效应,从而使测量结果失真。在这个贡献中,两个经典的EMC电流探头与原位校准技术相结合,用于在直流偏置电流存在的情况下进行非接触阻抗测量。
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引用次数: 3
EMC Testing Approach for Power Distribution Unit of Small Satellite 小卫星配电单元电磁兼容测试方法
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788915
M. Borsi, Dániel Skirba, F. Lénárt, A. Bánfalvi, J. Szabó, Z. Váradi
In this paper the EMC test campaign of a high-reliability onboard small-satellite subsystem, the central distribution unit of the power subsystem is presented. Beside the description of the European Student Earth Orbiter (ESEO) mission which is a student satellite project of ESA, and the brief functional overview of the Power Distribution Unit (PDU), those challenges, techniques and experiences furthermore exact measurement methods are detailed that made base to carry out the required EMC tests and provided the proper qualification of the flight model of PDU on the board of ESEO. Since the mentioned unit was designed and manufactured in the Laboratory of Space Technology, the guidelines for the measurement campaign were also elaborated by the staff of the Laboratory, boosted by the professional heritage of several past space projects, so as the proper performance of test phases with strong contribution of university students.
本文介绍了高可靠性星载小卫星分系统——电源分系统的中心配电单元的电磁兼容试验。介绍了欧空局学生卫星项目欧洲学生地球轨道飞行器(ESEO)任务,简要介绍了配电单元(PDU)的功能概况,详细介绍了配电单元(PDU)所面临的挑战、技术和经验以及精确的测量方法,为开展所需的电磁兼容测试奠定了基础,并为配电单元的飞行模型在ESEO板上的适当认证提供了依据。由于上述装置是在空间技术实验室设计和制造的,因此实验室的工作人员也在过去几个空间项目的专业遗产的推动下制定了测量活动的指导方针,因此在大学生的大力贡献下,测试阶段的适当表现。
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引用次数: 0
Numerical Investigation of the Stochastic Field-to-Wire Coupling to Transmission Lines with Small Bend Angles 小弯角输电线路随机场线耦合的数值研究
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788925
J. Kasper, R. Vick
This work deals with and combines two important topics of electromagnetic compatibility. First, there exist so called stochastic electromagnetic fields, like they occur in overmoded cavities like reverberation chambers or e.g. satellite bodies and airplanes [1]. On the other hand, this work focuses on transmission lines (TLs), as they may act as receiving antennas. Transmission lines often do not run in a straight line, but must be bent or curved due to environmental restrictions. In [2], the field-to-wire coupling to bent and curved transmission lines was investigated via measurements in a reverberation chamber. It has turned out that for large bending angles there are nearly no changes in the coupled voltage. For bending angles smaller than 30°, however, interesting effects occur. These smaller bending angles will be examined in more detail in this paper. Furthermore, it was found out that the bent and the coupling of the conductors must be taken into account in the transmission line model, which is based on the BLT-equations (named after Baum, Liu and Tesche) [3]. For the investigation, a single conductor transmission line (SCL) over a conducting ground plane is considered, which is terminated at the beginning and at the end with a certain load. Now, the coupled voltage for different bending angles shall be investigated with the help of simulations in CONCEPT-II. Moreover, the bent in the already existing simulation model from [3] is taken into account using a location-dependent characteristic impedance.
这项工作涉及并结合了电磁兼容性的两个重要主题。首先,存在所谓的随机电磁场,就像它们发生在混响室或卫星体和飞机b[1]等过度模态腔中一样。另一方面,这项工作的重点是传输线(TLs),因为它们可能充当接收天线。输电线路往往不是直线运行,而是由于环境的限制而必须弯曲或弯曲。在[2]中,通过混响室的测量研究了弯曲和弯曲传输线的场线耦合。结果表明,当弯曲角度较大时,耦合电压几乎没有变化。然而,对于小于30°的弯曲角,会发生有趣的效果。这些较小的弯曲角度将在本文中进行更详细的研究。此外,还发现在基于blt方程(以Baum, Liu和Tesche命名)的传输线模型中必须考虑导线的弯曲和耦合。在研究中,考虑在导电接地面上的单导体传输线(SCL),该传输线在起点和终点都有一定的负载。现在,我们将借助CONCEPT-II的仿真来研究不同弯曲角度下的耦合电压。此外,利用位置相关特性阻抗考虑了已有的[3]仿真模型中的弯曲。
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引用次数: 1
Enhanced Geometrical Model of Complex Cable Bundles Through Polynomial Representation of Cable Trajectories 基于电缆轨迹多项式表示的复杂电缆束几何模型的改进
Pub Date : 2019-05-01 DOI: 10.23919/AeroEMC.2019.8788917
X. Liu, F. Grassi, G. Spadacini, S. Pignari
In this paper, a novel approach for modelling hand-assembled random cable bundles is presented. The proposed method foresees to represent each cable position in the bundle via analytical polynomial curves, assuring smoothness of trajectories, as well as flexibility in accounting for bundle randomness. The generated bundle geometry is used in combination with full-wave and transmission-line based simulation, providing accurate predictions of the noise induced at the bundle terminals due to crosstalk between wires and due to an external EM field. The proposed examples, run in comparison with the more computationally-efficient yet approximate model in [1], prove the validity of the proposed generation algorithm and the need for accurate representation and discretization of the bundle if reliable predictions in a wide frequency interval are the target.
本文提出了一种模拟手工组装随机电缆束的新方法。该方法预计通过解析多项式曲线表示束中的每个电缆位置,保证了轨迹的平滑性,以及考虑束随机性的灵活性。生成的束几何形状与全波和基于传输在线的模拟相结合,可以准确预测由于电线之间的串扰和外部电磁场引起的束终端噪声。通过与[1]中计算效率更高的近似模型进行比较,所提出的示例证明了所提出的生成算法的有效性,如果目标是在较宽的频率区间内进行可靠的预测,则需要对束进行准确的表示和离散化。
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引用次数: 0
期刊
2019 ESA Workshop on Aerospace EMC (Aerospace EMC)
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