Bibliografías temáticas / Time-domain analysis. Frequency selective surfaces

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Literatura académica sobre el tema "Time-domain analysis. Frequency selective surfaces"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 7 de febrero de 2022

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Artículos de revistas sobre el tema "Time-domain analysis. Frequency selective surfaces"

Skinner, Neal G. y Dale M. Byrne. "Finite-difference time-domain analysis of frequency-selective surfaces in the mid-infrared". Applied Optics 45, n.º 9 (20 de marzo de 2006): 1943. http://dx.doi.org/10.1364/ao.45.001943.

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Qing, Anyong. "VECTOR SPECTRAL-DOMAIN METHOD FOR THE ANALYSIS OF FREQUENCY SELECTIVE SURFACES". Progress In Electromagnetics Research 65 (2006): 201–32. http://dx.doi.org/10.2528/pier06091401.

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Wang, D. X., E. K. N. Yung y R. S. Chen. "Spectral domain analysis of frequency-selective surfaces on biaxially anisotropic substrate". IET Microwaves, Antennas & Propagation 1, n.º 2 (2007): 335. http://dx.doi.org/10.1049/iet-map:20060003.

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Xue, Wei, Chen Liu, Nan Zhu y Xiao Xiang He. "Electromagnetic Analysis of Frequency Selective Surfaces Using the SSED Method". Applied Mechanics and Materials 130-134 (octubre de 2011): 1365–69. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1365.

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The Simplified sub-entire domain (SSED) basis function method has been introduced and modified to analyze some planar and curved Frequency selective surfaces (FSSs) with finite size. The number of unknowns and memory consumption of the methods are discussed in detail. The reflection coefficients and transmission coefficients are given, which agree well with the reference results.

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Yahaghi, A., A. Fallahi, H. Abiri, M. Shahabadi, C. Hafner y R. Vahldieck. "Analysis of Frequency Selective Surfaces on Periodic Substrates Using Entire Domain Basis Functions". IEEE Transactions on Antennas and Propagation 58, n.º 3 (marzo de 2010): 876–86. http://dx.doi.org/10.1109/tap.2009.2039327.

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Rogier, Hendrik, Daniël De Zutter y Frank Olyslager. "Rigorous analysis of frequency selective surfaces of finite extent using a hybrid finite difference time domain-boundary integral equation technique". Radio Science 35, n.º 2 (marzo de 2000): 483–94. http://dx.doi.org/10.1029/1999rs001911.

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Yu, Yan Xin, Chun Yang Wang, Yan Jun Sun y Wen Ting Jiang. "Study on Analysis and Simulation of Novel Frequency Selective Surfaces". Advanced Materials Research 1049-1050 (octubre de 2014): 790–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.790.

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Frequency selective surface (FSS) is a two-dimensional periodic structure. It exhibits total reflection and transmission in the neighborhood of the element resonances. As it performs as a filter, FSS is widely used in the fields of microwave and optics. In this paper, the finite element method is used to analysis frequency selective surface and study on the feasibility of Ansoft HFSS software for frequency selective surface simulation. Hexagonal element of frequency selective surface is as an example to explore the simulation method and the process of Ansoft HFSS. Through the comparison of the simulation curves and the measured curves of hexagonal element frequency selective surface film by photoetching technology, the simulation method of Ansoft HFSS software for frequency selective surface is correct. At the same time, this paper further verified the reliability of the simulation through the example of the ring and the cross unit structure.

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Mai, Wending, Benjamin Zerbe y Douglas Werner. "Discontinuous Galerkin Time Domain Method with Dispersive Modified Debye Model and its Application to the Analysis of Optical Frequency Selective Surfaces". Applied Computational Electromagnetics Society 36, n.º 1 (27 de febrero de 2021): 27–34. http://dx.doi.org/10.47037/2020.aces.j.360104.

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We develop a discontinuous Galerkin time domain (DGTD) algorithm with an experimentally validated modified Debye model (MDM) to take metal dispersion into consideration. The MDM equation is coupled with Maxwell’s equations and solved together through the auxiliary differential equation (ADE) method. A Runge-Kutta time-stepping scheme is proposed to update the semi-discrete transformed Maxwell’s equations and ADEs with high order accuracy. Then we employ the proposed algorithm to analyze an infinite doubly periodic frequency selective surface (FSS) operating in the optical regime that exhibits transmission enhancement due to the surface plasmatic effect. The accuracy and the efficiency enhancements are validated through a comparison with commercial simulation software. This work represents the first integration of MDM with DGTD, which enables the DGTD algorithm to efficiently analyze metallic structures in the optical regime.

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Wang, Quan-Quan, Hong-Bo Zhu, Ru-Shan Chen y Yun-Qin Hu. "Analysis of finite frequency selective surfaces backed by dielectric substrate using sub-entire-domain basis function method". COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, n.º 4 (6 de julio de 2015): 1144–55. http://dx.doi.org/10.1108/compel-08-2014-0205.

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Purpose – Analysis of the frequency selective surface (FSS) is of great significance. In the method of moments, when the electric size of the FSS increases, huge in-core memory and CPU time are required. The purpose of this paper is to efficiently analyze the finite FSS backed by dielectric substrate utilizing sub-entire-domain (SED) basis function method. Design/methodology/approach – Different types of SED basis functions are generated according to the locations of the cells in the entire structure, and a reduced system is constructed and solved. The couplings of all cells of the FSS are taken into account by using Green’s function and Galerkin’s test procedure. The spatial Green’s function is obtained with the discrete complex image method. The reflection and transmission coefficients of the FSS are calculated using the far field of the FSS and the metallic plate with the same size. Findings – Moderate problems of the finite FSS backed by dielectric substrate are solved with the SED basis function method. The original problem can be simplified to two smaller problems. It enables a significant reduction to the matrix size and storage, and efficient analysis of FSS can be performed. The band-stop type of FSS can be composed of periodic conductive patch cells on the dielectric substrate, and shows total reflection property at the resonant frequency. Originality/value – The SED basis function method is mostly used to analyze periodic PEC structures in free space. The layered medium Green’s function is successfully employed and several dielectric substrate backed finite FSSs are discussed in this paper. The calculation of reflection and transmission coefficients, which are more effective rather than far field scattering of the FSS, are described.

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Don, Nataliya, Maurizio Bozzi, Anatoly Kirilenko y Luca Perregrini. "Analysis of inductive frequency selective surfaces by the method of moments with entire-domain basis functions". Microwave and Optical Technology Letters 49, n.º 12 (2007): 2929–32. http://dx.doi.org/10.1002/mop.22923.

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Tesis sobre el tema "Time-domain analysis. Frequency selective surfaces"

Silva, T?rcio de Lima. "An?lise de onda completa de superf?cie seletiva em freq??ncia do tipo anteparo duplo". Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15383.

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Made available in DSpace on 2014-12-17T14:55:55Z (GMT). No. of bitstreams: 1 TercioLS_DISSERT.pdf: 2173183 bytes, checksum: 0473c9e56e2e2ec2462372a52af84fd3 (MD5) Previous issue date: 2011-12-21
This work presents a theoretical analysis and numerical and experimental results of the scattering characteristics of frequency selective surfaces, using elements of type patch perfectly conductor. The structures are composed of two frequency selective surfaces on isotropic dielectric substrates cascaded, separated by a layer of air. The analysis is performed using the method of equivalent transmission line in combination with the Galerkin method, to determine the transmission and reflection characteristics of the structures analyzed. Specifically, the analysis uses the impedance method, which models the structure by an equivalent circuit, and applies the theory of transmission lines to determine the dyadic Green's function for the cascade structure. This function relates the incident field and surface current densities. These fields are determined algebraically by means of potential incidents and the imposition of the continuity of the fields in the dielectric interfaces. The Galerkin method is applied to the numerical determination of the unknown weight coefficients and hence the unknown densities of surface currents, which are expanded in terms of known basis functions multiplied by these weight coefficients. From the determination of these functions, it becomes possible to obtain numerical scattered fields at the top and bottom of the structures and characteristics of transmission and reflection of these structures. At work, we present numerical and experimental results for the characteristics of transmission and reflection. Comparisons were made with other results presented in literature, and it was observed a good agreement in the cases presented suggestions continuity of the work are presented
Esse trabalho apresenta uma an?lise te?rica e resultados num?ricos e experimentais das caracter?sticas de espalhamento de superf?cies seletivas em frequ?ncia, que usam elementos do tipo patch perfeitamente condutor. As estruturas s?o compostas por duas superf?cies seletivas em frequ?ncia sobre substratos diel?tricos isotr?picos cascateadas, separadas por uma camada de ar. A an?lise ? efetuada utilizando-se o m?todo da linha de transmiss?o equivalente em combina??o com o m?todo de Galerkin, visando determinar as caracter?sticas de transmiss?o e reflex?o das estruturas analisadas. Especificamente, a an?lise usa o m?todo da imped?ncia, que modela a estrutura por meio de um circuito equivalente e, aplica-se a teoria de linhas de transmiss?o para determinar a fun??o di?dica de Green, para a estrutura em cascata. Esta fun??o relaciona os campos incidentes e as densidades superficiais de corrente. Estes campos s?o determinados algebricamente por meio dos potenciais incidentes e da imposi??o da continuidade dos campos nas interfaces diel?tricas. O m?todo de Galerkin ? aplicado na determina??o num?rica dos coeficientes pesos desconhecidos e, consequentemente, das densidades superficiais de correntes desconhecidas, que s?o expandidas em termos de fun??es de base conhecidas multiplicadas por esses coeficientes peso. A partir da determina??o destas fun??es, torna-se poss?vel a obten??o num?rica dos campos espalhados no topo e na base das estruturas e das caracter?sticas de transmiss?o e de reflex?o destas estruturas. No trabalho, s?o apresentados resultados num?ricos e experimentais para as caracter?sticas de transmiss?o e de reflex?o. Foram efetuadas compara??es com outros resultados apresentados na literatura, tendo-se observado uma boa concord?ncia nos casos analisados Sugest?es de continuidade do trabalho s?o apresentadas

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Gregory, Skinner Neal. "FDTD studies of frequency selective surfaces /". 2006. http://proquest.umi.com/pqdweb?did=1221710221&sid=2&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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Actas de conferencias sobre el tema "Time-domain analysis. Frequency selective surfaces"

Mai, Wending, Sawyer D. Campbell, Douglas H. Werner, Yifan Chen y Huaguang Bao. "Prism-based Discontinuous Galerkin Time Domain Analysis of Frequency Selective Surfaces in Lossy Water". En 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf35879.2020.9330257.

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Mao, Yunfei, Bin Chen y Baoshan Fang. "Analysis of frequency selective surfaces using alternating-direction-implicit spectral finite-difference time-domain method". En 2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2012. http://dx.doi.org/10.1109/icmmt.2012.6230130.

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Qing, Anyong y Xin Xu. "Vector Spectral-domain Method for the Analysis of Frequency Selective Surfaces". En Proceedings of the Symposium R. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701718_0047.

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Chen, Xin-yi, Jian-bo Wang, Gui-bo Chen, Guan-cheng Sun y Jun Lu. "Numerical analysis of curved frequency selective surface by finite-difference time-domain". En International Symposium on Photoelectronic Detection and Imaging 2011. SPIE, 2011. http://dx.doi.org/10.1117/12.899578.

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Zhuang, W., Z. H. Fan, D. Z. Ding y R. S. Chen. "An Efficient Technique for Analysis of Frequency Selective Surface in Spectral Domain with RWG Basis Functions". En 2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components (IMWS). IEEE, 2008. http://dx.doi.org/10.1109/imws.2008.4782306.

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Grimm, Felix, Jean-Michel Lourier, Oliver Lammel, Berthold Noll y Manfred Aigner. "A Selective Fast Fourier Filtering Approach Applied to High Frequency Thermoacoustic Instability Analysis". En ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63234.

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A method for selective, frequency-resolved analysis of spatially distributed, time-coherent data is introduced. It relies on filtering of Fourier-processed signals with periodic structures in frequency-domain. Therefrom extracted information can be analyzed in both, frequency- and time-domain using an inverse transformation ansatz. In the presented paper, the approach is applied to a laboratory scale, twelve nozzle FLOX®-GT-burner for the investigation of high-frequency thermoacoustic pressure oscillations and limit-cycle mechanisms. The burner is operated at elevated pressure for partially premixed combustion of a hydrogen and natural gas mixture with air. At a certain amount of hydrogen addition to fuel injection, the burner exhibits self-sustained high-frequency thermoacoustic oscillation. This unstable operation is simulated with the fractional step approach SICS (Semi Implicit Characteristic Splitting), a pressure based solver extension of the Finite Volume based research code THETA (Turbulent Heat Release Extension for the TAU Code) for the treatment of weakly compressible flows with combustion. A hybrid LES/URANS simulation delivers time-resolved simulation data of the thermoacoustically unstable operation condition, which is analyzed with the presented SFFFA (Selective Fast Fourier Filtering Approach). Acoustic pressure distribution in the combustion chamber is explicitly resolved and assigned to different characteristic modes by signal decomposition. Furthermore, the SFFFA is used for the analysis of acoustic feedback mechanism by investigating filtered transient heat release, acoustic pressure, velocity and mixture fraction. Coherent structures in flow field and combustion as well as periodic convective processes are resolved and linked to transient acoustic pressure, extensively describing the acoustic feedback of the examined burner configuration.

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Kim, Booki, Min-Cheol Ryu, Jun-Hyung Jung y Yungsup Shin. "Identification of Critical Sea States for Sloshing Model Tests". En SNAME Maritime Convention. SNAME, 2010. http://dx.doi.org/10.5957/smc-2010-t38.

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This paper presents a methodology for identifying a set of irregular sea states for sloshing model test conditions that are most likely to produce large sloshing pressures on tank walls. To identify the critical sea states, the sloshing pseudo-response amplitude operator (RAO) is defined based on the total sloshing wave energy that is the sum of kinetic and potential energies on the free surface. The mathematical model is formulated in the frequency domain within the regime of potential flow theory. A concept of sloshing intensity is then introduced to define the sloshing severity in an irregular sea state based on the area under the sloshing wave energy response spectrum curve. The tank is expected to induce violent fluid motions for high sloshing intensity values and, as a result, its walls can experience large sloshing impact pressures. The validity of the proposed methodology is investigated by comparing the results of the numerical analysis to those of the model test for the cargo tank of a floating liquefied natural gas terminal. Favorable results in identifying the critical sea states are obtained for tested filling levels. The proposed methodology can be utilized as a pre-screening procedure for selecting relevant sea states at the initial phase of the sloshing model test and for use in the selection of sloshing flow simulation conditions.

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Gharbia, Yousef, Said Grami y Aref Wazwaz. "Vacuum Cavity Parabolic Trough Collector". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37103.

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Without frequent cleaning, dust accumulation on parabolic trough collectors can lead to significant degradation of the performance of trough collectors over time. Owing to the nature of the trough profile and the presence of the receiving tube in the middle of the trough, automatic cleaning has not been a feasible option. The problem of dust accumulation is of particular interest in the Middle East/North African (MENA) region with the high frequency of dusty days throughout the year. This paper presents a thermal numerical analysis of a novel vacuum cavity parabolic trough collector (VCPTC) in which the top and the sides of the trough were covered with borosilicate sheets and a vacuum was assumed inside the cavity. The typical vacuum tube used in conventional troughs was replaced by a bare stainless steel pipe with selective coating. The new trough with its flat top surface should now be much easier to clean with an automatic cleaning machine. This paper compares the performance of a conventional trough with the new VCPTC in terms of overall heat loss. The results have shown that the VCPTC has slightly outperformed the conventional trough.

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Kurdi, Mohammad H., Tony L. Schmitz, Raphael T. Haftka y Brian P. Mann. "Simultaneous Optimization of Removal Rate and Part Accuracy in High-Speed Milling". En ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60231.

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High-speed milling provides an efficient method for accurate discrete part fabrication. However, successful implementation requires the selection of appropriate operating parameters. Balancing the multiple process requirements, including high material removal rate, maximum part accuracy, sufficient tool life, chatter avoidance, and adequate surface finish, to arrive at an optimum solution is difficult without the aid of an optimization framework. In this paper an initial effort is made to apply analytical tools to the selection of optimum cutting parameters (spindle speed and depth of cut are considered at this stage). Two objectives are addressed simultaneously, maximum removal rate and minimum surface location error. The Time Finite Element Analysis method is used in the optimization algorithm. Sensitivity of the surface location error to small changes in spindle speed near tooth passing frequencies that are integer fractions of the system’s natural frequency corresponding to the most flexible mode is calculated. Results of the optimization algorithm are verified by experiment.

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Wang, Xingtao, Robert E. Williams, Michael P. Sealy, Prahalada Rao y Yuebin Guo. "Stochastic Modeling and Analysis of Spindle Energy Consumption During Hard Milling With a Focus on Tool Wear". En ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6511.

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The rapid development of modern science and technology brings with it a high demand for manufacturing quality. The surface integrity of a machined part is a critical factor which needs to be considered in the selection of the appropriate machining processes. By monitoring and predicting tool wear, it is possible to improve sustainability by reducing the scrap rate due to poor surface integrity. In this work, Data Dependent Systems (DDS), a stochastic modeling and analysis technique, was applied to study spindle motor energy consumption during a hard milling operation. The objective was to correlate the spindle power to tool wear conditions using DDS analysis. The spindle power was monitored and the time series trends were decomposed to study the frequency variation with different severities of tool wear conditions and processing parameters. Analysis of Variance (ANOVA) was also used to determine factors significant to the energy consumption by a spindle motor. Experiments indicate that low-level frequency of spindle power is correlated with the amount of tool wear, cutting speed, and feed per tooth. Results suggest that effective tool wear monitoring may be achieved by focusing on low-level frequencies (0.1 rad/sec) highlighted by DDS methodology.

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