IEEE Journal on Multiscale and Multiphysics Computational Techniques最新文献_第8页

Optimization Using Backtracking Search Algorithm for the Design of Magnetron Anode Block and Pill-Box RF Window 基于回溯搜索算法的磁控管阳极块和药盒射频窗口设计

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-08-14 DOI: 10.1109/JMMCT.2023.3304970

Patibandla Anilkumar;Dobbidi Pamu;Tapeshwar Tiwari

{"title":"Optimization Using Backtracking Search Algorithm for the Design of Magnetron Anode Block and Pill-Box RF Window","authors":"Patibandla Anilkumar;Dobbidi Pamu;Tapeshwar Tiwari","doi":"10.1109/JMMCT.2023.3304970","DOIUrl":"https://doi.org/10.1109/JMMCT.2023.3304970","url":null,"abstract":"Determining the design variables of the magnetron sub-assemblies using empirical equations is a challenge. In this article, with the help of the popular backtracking search algorithm (BSA), the bare anode block of the magnetron and pill-box RF window are designed at frequency of 2.998 GHz. The convergence results with BSA are validated with the harmony search algorithm (HSA) and particle swarm optimization (PSO). The optimized design variables of bare anode are hole radius (\u0000<inline-formula><tex-math>$a$</tex-math></inline-formula>\u0000), slot length (\u0000<inline-formula><tex-math>$l_{s}$</tex-math></inline-formula>\u0000), slot width (\u0000<inline-formula><tex-math>$W_{s}$</tex-math></inline-formula>\u0000), and anode height (\u0000<inline-formula><tex-math>$h_{a}$</tex-math></inline-formula>\u0000) which are found to be 3.1, 2.9, 12.8, and 100 mm, respectively, and converge within 150 iterations with BSA. The optimized results are compared to simulated results which are nearly identical with a negligible relative difference of \u0000<inline-formula><tex-math>$pi$</tex-math></inline-formula>\u0000-mode is 1.08%. From the pill-box RF window design, multi-objective optimization is carried out to reach the desired frequency and to achieve minimized reflections by maximizing the bandwidth. The corresponding design variables dielectric thickness (\u0000<inline-formula><tex-math>$t_{w}$</tex-math></inline-formula>\u0000), cavity length (\u0000<inline-formula><tex-math>$C_{l}$</tex-math></inline-formula>\u0000), and cavity radius (\u0000<inline-formula><tex-math>$C_{r}$</tex-math></inline-formula>\u0000) which are 2.5, 30.4, and 41.5 mm, respectively. Pareto multi-objective BSA (PMBSA) is validated with the weighted sum approach (WSA). Due to its simplicity and lower latency, optimization approach is helpful to designers to develop the microwave devices.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"8 ","pages":"314-321"},"PeriodicalIF":2.3,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49962808","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

Electromagnetic Field Reconstruction and Source Identification Using Conditional Variational Autoencoder and CNN 基于条件变分自编码器和CNN的电磁场重建与源识别

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-08-14 DOI: 10.1109/JMMCT.2023.3304709

Sami Barmada;Paolo Di Barba;Nunzia Fontana;Maria Evelina Mognaschi;Mauro Tucci

引用次数: 0

Lorentz-Invariant Meshless Vector Basis Function for Translational Motion of Coordinates in Computational Electromagnetics 计算电磁学中坐标平移运动的洛伦兹不变无网格向量基函数

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-08-09 DOI: 10.1109/JMMCT.2023.3303813

Arman Afsari;Paulo de Souza;Amin Abbosh;Yahya Rahmat-Samii

{"title":"Lorentz-Invariant Meshless Vector Basis Function for Translational Motion of Coordinates in Computational Electromagnetics","authors":"Arman Afsari;Paulo de Souza;Amin Abbosh;Yahya Rahmat-Samii","doi":"10.1109/JMMCT.2023.3303813","DOIUrl":"https://doi.org/10.1109/JMMCT.2023.3303813","url":null,"abstract":"Laws of physics remain unchanged under translational motion of coordinates. To guarantee the above postulate in electromagnetics, Lorenz gauge eliminates the additional terms generated in the wave equation of magnetic vector potential during translational motion. When it comes to computational electromagnetics, nonetheless, Coulomb gauge is still preferred to represent the divergence of the magnetic vector potential; the vector basis functions involved in the computation of magnetic vector potential are thus divergence-free. There is, however, an immediate consequence that we shall consider here. These vector basis functions cannot incorporate any kinematic transformation of the system of coordinates. The solution achieved by them is, therefore, invalid under translational motion of the system of coordinates as a whole. Less attention has been paid to this side of computational electromagnetics, as the problems that we solve do not usually undergo any kinematic transformation. The new meshless vector basis function presented in this article is Lorentz-invariant. The solution achieved by it is, therefore, valid under translational motion. Even in local problems, the solution achieved by the newly-introduced Lorentz-invariant vector basis function demonstrates more accuracy and efficiency with respect to the solution achieved by the divergence-free vector basis functions in meshless method.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"8 ","pages":"281-295"},"PeriodicalIF":2.3,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49962914","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

Accurate Prediction of Measured Microwave-Induced Thermoacoustic Signals via Multiphysics Simulations Augmented With an Acoustic Detection System Transfer Function 基于声探测系统传递函数的多物理场模拟对微波热声信号的精确预测

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-08-09 DOI: 10.1109/JMMCT.2023.3303871

Audrey L. Evans;Chu Ma;Susan C. Hagness

{"title":"Accurate Prediction of Measured Microwave-Induced Thermoacoustic Signals via Multiphysics Simulations Augmented With an Acoustic Detection System Transfer Function","authors":"Audrey L. Evans;Chu Ma;Susan C. Hagness","doi":"10.1109/JMMCT.2023.3303871","DOIUrl":"https://doi.org/10.1109/JMMCT.2023.3303871","url":null,"abstract":"Multiphysics simulation tools for modeling the generation and propagation of microwave-induced thermoacoustic (TA) signals aid in the development of emerging applications in medical imaging and communications. Simulation models of microwave-induced TA signals that lack consideration of the impact of the acoustic detection system result in a mismatch in the temporal characteristics of simulated and measured TA signals. We address this discrepancy by introducing an acoustic detection system transfer function that captures the combined effects of the ultrasound transducer and the acoustic signal filtering/amplification system and can be applied to simulated signals to improve their predictive accuracy. We determine the transfer function of a microwave-induced TA signal measurement system by comparing simulated and measured TA signals in a training testbed. We apply this transfer function to a set of simulated TA signals obtained from a performance evaluation testbed (differing from the training testbed) and compare to measured TA signals from that same testing scenario. We show that this technique resolves a long-standing discrepancy between simulation and experiment. Our proposed methodology for determining the acoustic detection system transfer function can be extended to other acoustic detection applications that require high-fidelity simulation models.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"8 ","pages":"306-313"},"PeriodicalIF":2.3,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49962916","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

Reduced Order Modeling for Parameterized Electromagnetic Simulation Based on Tensor Decomposition 基于张量分解的参数化电磁仿真降阶建模

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-08-04 DOI: 10.1109/JMMCT.2023.3301978

Xiao-Feng He;Liang Li;Stéphane Lanteri;Kun Li

引用次数: 0

Multi-Mode Analysis of Scattering by Bodies of Revolutions via the Combined-Field Integral Equation 用联合场积分方程分析旋转体散射的多模态

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-07-21 DOI: 10.1109/JMMCT.2023.3297926

Fahimeh Sepehripour;Bastiaan P. de Hon;Martijn C. van Beurden

引用次数: 0

Accuracy Analysis of Div-Conforming Hierarchical Higher-Order Discretization Schemes for the Magnetic Field Integral Equation 磁场积分方程的非一致性分层高阶离散化格式精度分析

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-07-20 DOI: 10.1109/JMMCT.2023.3297548

Jonas Kornprobst;Thomas F. Eibert

引用次数: 0

Rapid Flux Concentration Factor Determination for Halbach Array Based PM Rotors Using Composite FE Based Method 基于复合有限元法的Halbach阵列永磁转子通量浓度因子快速测定

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-07-06 DOI: 10.1109/JMMCT.2023.3292979

Sharankumar Shastri;Bhim Singh

{"title":"Rapid Flux Concentration Factor Determination for Halbach Array Based PM Rotors Using Composite FE Based Method","authors":"Sharankumar Shastri;Bhim Singh","doi":"10.1109/JMMCT.2023.3292979","DOIUrl":"https://doi.org/10.1109/JMMCT.2023.3292979","url":null,"abstract":"Conventional empirical-formulae (CEF) based permanent magnet (PM) motor design employs the use of several assumptions in the form of magnetic material non-linearity, air-gap and magnet reluctances derived from assumed leakage factors leading to the incorrect estimation of air-gap flux densities. This problem is much more prevalent in various forms of hybrid PM magnetization topologies such as Halbach array based PM (HAPM) or Halbach array based consequent pole based PM (HACPPM) rotors. In order to improve the air-gap magnetic flux density estimation using the CEF design method, a flux density adjustment factor is proposed in this work, which utilizes a look-up table formed upon a reduced electromagnetic finite-element simulation search space to improve the accuracy of flux density estimation in both Halbach and Consequent-Halbach PM rotors using the flux concentration factor (FCF). First, the derivation of the FCF is introduced. Then the effectiveness of the FCF + CEF method is analyzed quantitatively, in comparison with conventional CEF and 2D-FE (electromagnetic) methods and performance is analyzed.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"8 ","pages":"241-251"},"PeriodicalIF":2.3,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49981547","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

Multiscale EMC Modeling, Simulation, and Validation of a Synchronous Step-Down DC-DC Converter 同步降压DC-DC变换器的多尺度电磁兼容建模、仿真和验证

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-06-05 DOI: 10.1109/JMMCT.2023.3276358

Rajen Murugan;Jie Chen;Ambreesh Tripathi;Bibhu Prasad Nayak;Harikiran Muniganti;Dipanjan Gope

{"title":"Multiscale EMC Modeling, Simulation, and Validation of a Synchronous Step-Down DC-DC Converter","authors":"Rajen Murugan;Jie Chen;Ambreesh Tripathi;Bibhu Prasad Nayak;Harikiran Muniganti;Dipanjan Gope","doi":"10.1109/JMMCT.2023.3276358","DOIUrl":"https://doi.org/10.1109/JMMCT.2023.3276358","url":null,"abstract":"The proliferation of power electronics in automotive and industrial applications raises compliance challenges in meeting electromagnetic compatibility (EMC) regulatory standards. In this work, we develop a robust multiscale system-level modeling and simulation methodology for predicting CISPR 25 conducted emission (CE) and radiated emission (RE). The method is based on a novel two-stage process. In the first stage, the IC model is generated either by non-linear time-domain simulation using a device-level physics model or oscilloscope measurements if a prototype is available. In the second stage, the IC model waveforms are used in a simulation environment comprising 3D full-wave frequency domain analysis and specially prepared macro-models for the laboratory equipment. Silicon validation of CISPR 25 EMC measurements on a “low-EMI,” high-performance DCDC automotive/industrial synchronous step-down converter is presented to validate the integrity of the predictive modeling methodology. Good correlations between modeling and EMC-certified testing laboratory emission measurements are achieved (i.e., within +/- 3 dBuV for CE and +/- 6 dBuV for RE). As a result, the predictive EMC modeling methodology can be implemented, early in the design cycle, to ensure first-pass EMC-compliant design.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"8 ","pages":"269-280"},"PeriodicalIF":2.3,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49962913","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

Mixed-Potential Integral Equation (MPIE) Formulation for Arbitrarily Shaped Conducting Objects in Plane-Stratified Uniaxial Media—A New Look 平面分层单轴介质中任意形状导电物体的混合势积分方程(MPIE)公式——新观点

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2023-04-27 DOI: 10.1109/JMMCT.2023.3271290

Krzysztof A. Michalski

引用次数: 0