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Physics-Based Automatic Recognition of Small Features Located in Highly Similar Structures With Electromagnetic Scattering Data 基于物理的电磁散射数据高度相似结构中的小特征自动识别
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-11-09 DOI: 10.1109/JMMCT.2022.3220716
Zi-Liang Liu;Chao-Fu Wang
{"title":"Physics-Based Automatic Recognition of Small Features Located in Highly Similar Structures With Electromagnetic Scattering Data","authors":"Zi-Liang Liu;Chao-Fu Wang","doi":"10.1109/JMMCT.2022.3220716","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3220716","url":null,"abstract":"A physics-based automatic target recognition (ATR) technique is developed to accurately identify small features located in highly similar structures with electromagnetic (EM) scattering data. Automatic target recognition is important due to its widely practical applications. The traditional ATR is usually based on images produced from EM scattering data and sophisticated algorithms. Wideband angular and frequency sweeps are necessary to generate sufficient EM scattering data to produce images with high resolution for the imagery-based ATR to obtain correct recognition results, especially for multiscale structures with small local features. These seriously limit the efficiency of the imagery-based ATR and its practicability. To implement ATR more efficiently, we turn to the physics-based ATR and employ principal component analysis (PCA). The physics-based ATR with PCA can exactly classify objects of different types with one-frequency scattering data and avoid expensive frequency sweeps. However, the pre-existing average feature center (AFC) criterion model for PCA in the literature can only distinguish objects with significant differences and fails to recognize small features located in highly similar structures. Hence, an improved classification criterion for PCA is proposed to precisely identify highly similar structures with different small features. Some numerical examples illustrate the satisfactory performance of the proposed technique.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Variability in Specific Absorption Rate From Variation in Tissue Properties 组织特性变化引起的比吸收率变异性
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-10-25 DOI: 10.1109/JMMCT.2022.3216642
Khadijeh Masumnia-Bisheh;Cynthia Furse
{"title":"Variability in Specific Absorption Rate From Variation in Tissue Properties","authors":"Khadijeh Masumnia-Bisheh;Cynthia Furse","doi":"10.1109/JMMCT.2022.3216642","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3216642","url":null,"abstract":"This study evaluates the variance of specific absorption rate (SAR) due to expected variance in the dielectric properties of tissues in a 3D anatomical human head model exposed to a half-wave dipole antenna at 835 and 1900 MHz. Stochastic finite difference time domain (S-FDTD) is applied to calculate variations in the local SAR, and the 1- and 10-gram averaged SAR values. These are also compared at 835 MHz to variations found from Monte Carlo FDTD. It is found that for both frequencies dielectric property variance results in a variance of peak 1- or 10-gram SAR of approximately 30% to 55% of the mean SAR, depending on the frequency. These results show that to reach 95% confidence with the calculated SAR values for evaluating exposure guidelines, statistical variations in tissue electrical properties must be taken into account.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation and Experiment for the Bottom Boundary of Riprap of Seawall by GPR 海堤抛石底边界探地雷达数值模拟与试验
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-10-19 DOI: 10.1109/JMMCT.2022.3215804
Xiongwu Hu;Bingqing Kong;Xiaoyi Jiang;Guanqun Zhou;Lei Tan;Hu Xu
{"title":"Numerical Simulation and Experiment for the Bottom Boundary of Riprap of Seawall by GPR","authors":"Xiongwu Hu;Bingqing Kong;Xiaoyi Jiang;Guanqun Zhou;Lei Tan;Hu Xu","doi":"10.1109/JMMCT.2022.3215804","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3215804","url":null,"abstract":"Seawall engineering is essential in preventing typhoon storm surge disasters in coastal areas. Usually, the engineering measure of throwing the stone to form a riprap layer is adopted to enhance seawall stability and anti-erosion property. Determining the thickness of the riprap layer is an essential step in the evaluation of engineering measurement, and the key is to determine the burial depth of the bottom boundary of the riprap. A seawall is taken as the research object. The propagation process of the electromagnetic wave in the seawall is simulated by the finite difference time domain (FDTD) method, the propagation law and profile response characteristics of the electromagnetic wave are obtained, and the method's feasibility is confirmed theoretically. Further field test and drilling detection results are used to calibrate the electromagnetic wave velocity, and the top and bottom interface of the riprap layer is divided, which provides a basis for the measurement of the riprap body.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimating Fields in Spacecraft Cavities: Experimental Validation and Optimization of Finite-Difference Time-Domain and Power Balance Computational Tools 航天器空腔场估计:时域有限差分和功率平衡计算工具的实验验证与优化
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-10-13 DOI: 10.1109/JMMCT.2022.3211784
Javier Jair Pazos;Matthew C. Miller;Jeff Phillips;Eric Miller;Tim McDonald;Jennifer Kitaygorsky
{"title":"Estimating Fields in Spacecraft Cavities: Experimental Validation and Optimization of Finite-Difference Time-Domain and Power Balance Computational Tools","authors":"Javier Jair Pazos;Matthew C. Miller;Jeff Phillips;Eric Miller;Tim McDonald;Jennifer Kitaygorsky","doi":"10.1109/JMMCT.2022.3211784","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3211784","url":null,"abstract":"Electromagnetic fields in representative spacecraft cavities were successfully predicted using finite-difference time-domain and power balance computational tools. Results were validated with measurements of two test articles, showing excellent correlation in shielding effectiveness from 300 MHz to 18 GHz. The validated tools were then extended to predict fields inside representative, to-scale payload fairings including common systems and components like satellite payloads, antennas, acoustic blankets, and a cable harness. Various computational techniques were used to compare their speed and accuracy. Ultimately, we conclude that a multi-fidelity approach – combining full-wave, statistical, and hybrid solutions – is beneficial and necessary for complex and large cavity problems. The tools and techniques presented here can serve as part of a toolkit to rapidly estimate shielding effectiveness, the impact of payloads, and overall fields in spacecraft cavities.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Machine Learning Generative Method for Automating Antenna Design and Optimization 天线自动设计与优化的机器学习生成方法
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-09-30 DOI: 10.1109/JMMCT.2022.3211178
Yang Zhong;Peter Renner;Weiping Dou;Geng Ye;Jiang Zhu;Qing Huo Liu
{"title":"A Machine Learning Generative Method for Automating Antenna Design and Optimization","authors":"Yang Zhong;Peter Renner;Weiping Dou;Geng Ye;Jiang Zhu;Qing Huo Liu","doi":"10.1109/JMMCT.2022.3211178","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3211178","url":null,"abstract":"To facilitate the antenna design with the aid of computer, one of the practices in consumer electronic industry is to model and optimize antenna performances with a simplified antenna geometric scheme. The ease of handling multi-dimensional optimization problems and the less dependence on the engineers' knowledge and experience are the key to achieve the popularity of simulation-driven antenna design and optimization for the industry. In this paper, we introduce a flexible geometric scheme with the concept of mesh network that can form any arbitrary shape by connecting different nodes. For such problems with high dimensional parameters, we propose a machine learning based generative method to assist the searching of optimal solutions. It consists of discriminators and generators. The discriminators are used to predict the performance of geometric models, and the generators to create new candidates that will pass the discriminators. Moreover, an evolutionary criterion approach is proposed for further improving the efficiency of our method. Finally, not only optimal solutions can be found, but also the well trained generators can be used to automate future antenna design and optimization. For a dual resonance antenna design, our proposed method is better than the other mature algorithms.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Two-Dimensional Thermal Diffusion Equation Solver Based on Unstructured Transmission-Line Modelling and Optimal Delaunay Triangular Meshes 基于非结构化输电在线建模和最优Delaunay三角网格的二维热扩散方程求解器
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-09-23 DOI: 10.1109/JMMCT.2022.3209071
Kaiqi Yan;Ana Vukovic;Phillip Sewell;Trevor M. Benson
{"title":"Two-Dimensional Thermal Diffusion Equation Solver Based on Unstructured Transmission-Line Modelling and Optimal Delaunay Triangular Meshes","authors":"Kaiqi Yan;Ana Vukovic;Phillip Sewell;Trevor M. Benson","doi":"10.1109/JMMCT.2022.3209071","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3209071","url":null,"abstract":"The transmission-line modelling (TLM) method has been widely applied to many areas including electromagnetic and heat conduction problems. Its unstructured version, unstructured TLM (UTLM), however, has not hitherto been fully exploited in thermal diffusion problems. This paper derives in detail a thermal UTLM scheme to solve the two-dimensional diffusion equation numerically based on the optimal Delaunay triangular (ODT) mesh.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EM Wave Scattering by Random Surfaces With Different Contrast and Large Roughness Heights 不同对比度和大粗糙度高度随机表面的电磁波散射
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-09-07 DOI: 10.1109/JMMCT.2022.3204722
Mohsen Eslami Nazari;Weimin Huang
{"title":"EM Wave Scattering by Random Surfaces With Different Contrast and Large Roughness Heights","authors":"Mohsen Eslami Nazari;Weimin Huang","doi":"10.1109/JMMCT.2022.3204722","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3204722","url":null,"abstract":"A solution for electromagnetic (EM) scattering over a two-dimensional random rough surface (three-dimensional scattering problem) with large roughness height using the generalized functions approach is proposed in this paper. The EM field derivation incorporates rough surface profile with small-slope, a radiation source and involves all scattering orders of the scattered electric field (E-field) for high and moderate contrast media. Subsequently, the first-order scattered E-field is calculated using the Neumann series solution for transverse magnetic (TM) polarization. By considering pulsed dipole antenna and a two-dimensional Gaussian rough surface distribution with different root mean square heights and correlation lengths, the scattered E-field along with the radar cross-section is calculated. Using the result of the method of moments (MoM) as reference, a numerical evaluation of the solution for different roughness heights and contrast media demonstrates that the proposed solution is better than those of the small perturbation method (SPM), Kirchhoff approximation (KA) and small-slope approximation (SSA).","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A Stable Weighted Residual Finite Element Formulation for the Simulation of Linear Moving Conductor Problems 线性运动导体问题模拟的稳定加权剩余有限元公式
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-08-30 DOI: 10.1109/JMMCT.2022.3202913
Sethupathy Subramanian;Sujata Bhowmick
{"title":"A Stable Weighted Residual Finite Element Formulation for the Simulation of Linear Moving Conductor Problems","authors":"Sethupathy Subramanian;Sujata Bhowmick","doi":"10.1109/JMMCT.2022.3202913","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3202913","url":null,"abstract":"The finite element method is one of the widely employed numerical techniques in electrical engineering for the study of electric and magnetic fields. When applied to the moving conductor problems, the finite element method is known to have numerical oscillations in the solution. To resolve this, the upwinding techniques, which are developed for the transport equation are borrowed and directly employed for the magnetic induction equation. In this work, an alternative weighted residual formulation is explored for the simulation of the linear moving conductor problems. The formulation is parameter-free and the stability of the formulation is analytically studied for the 1D version of the moving conductor problem. Then the rate of convergence and the accuracy are illustrated with the help of several test cases in 1D as well as 2D. Subsequently, the stability of the formulation is demonstrated with a 3D moving conductor simulation.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Computational Techniques for Design and Analysis of Time-Varying Capacitor Loaded Transmission Lines Using FDTD and Simulink 基于FDTD和Simulink的时变电容负载传输线设计与分析计算技术
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-08-30 DOI: 10.1109/JMMCT.2022.3202990
Anand Kumar;Jogesh Chandra Dash;Debdeep Sarkar
{"title":"Computational Techniques for Design and Analysis of Time-Varying Capacitor Loaded Transmission Lines Using FDTD and Simulink","authors":"Anand Kumar;Jogesh Chandra Dash;Debdeep Sarkar","doi":"10.1109/JMMCT.2022.3202990","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3202990","url":null,"abstract":"In this paper, MATLAB based computational approaches for the design and analysis of time-varying capacitor- loaded transmission lines using the finite-difference time-domain (FDTD) technique and the Simulink design environment are presented. The FDTD formulation for multiple lumped capacitors loaded in series on a transmission line is discussed and extended to include time variation of capacitance. The design methodology for the same is also discussed using MATLAB's Simulink using the RF Blockset Library. The developed FDTD formulation and the Simulink method are then used to design a mixer with time-varying capacitors loaded transmission line.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Heat Transfer in a Ferrofluid-Based Transformer: Multiphysics Modeling Using the Finite Element Method 铁磁流体变压器的传热:多物理场有限元建模
IF 2.3
IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2022-08-19 DOI: 10.1109/JMMCT.2022.3200019
Sleimane Nasser El Dine;Xavier Mininger;Caroline Nore
{"title":"Heat Transfer in a Ferrofluid-Based Transformer: Multiphysics Modeling Using the Finite Element Method","authors":"Sleimane Nasser El Dine;Xavier Mininger;Caroline Nore","doi":"10.1109/JMMCT.2022.3200019","DOIUrl":"https://doi.org/10.1109/JMMCT.2022.3200019","url":null,"abstract":"This paper deals with a thermal-fluid-magnetic analysis based on the 3D finite element method to study the cooling efficiency inside a ferrofluid-based transformer. This cooling approach is first tested, both experimentally and numerically, on an axisymmetric coil. After cross-validation of the numerical and experimental results, a 400/230V transformer with a non-axisymmetric ferromagnetic core is modeled. The device is immersed in a steel tank filled with cobalt ferrite nanoparticles-based Midel vegetable oil. The time evolution of the temperature is recorded whether the Helmholtz magnetic force is activated or not. A decrease in the local temperature of the coil sensors by about 10 K is observed when the impact of the magnetic force is considered. Numerical results prove the beneficial effect of thermomagnetic convection on transformer cooling.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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