IEEE Journal on Multiscale and Multiphysics Computational Techniques最新文献_第5页

Multiphysics Numerical Method for Modeling Josephson Traveling-Wave Parametric Amplifiers 约瑟夫森行波参数放大器建模的多物理场数值方法

IF 1.8

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-07-15 DOI: 10.1109/JMMCT.2024.3428344

Samuel T. Elkin;Michael Haider;Thomas E. Roth

{"title":"Multiphysics Numerical Method for Modeling Josephson Traveling-Wave Parametric Amplifiers","authors":"Samuel T. Elkin;Michael Haider;Thomas E. Roth","doi":"10.1109/JMMCT.2024.3428344","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3428344","url":null,"abstract":"Josephson traveling-wave parametric amplifiers (JTWPAs) are wideband, ultralow-noise amplifiers used to enable the readout of superconducting qubits. While individual JTWPAs have achieved high performance, behavior between devices is inconsistent due to wide manufacturing tolerances. Amplifier designs could be modified to improve resilience towards variations in amplifier components; however, existing device models often rely on analytical techniques that typically fail to incorporate component variations. To begin addressing this issue, a 1D numerical method for modeling JTWPAs is introduced in this work. The method treats the Josephson junctions and transmission lines in an amplifier as coupled subsystems and can easily incorporate arbitrary parameter variations. We discretize the transmission line subsystem with a finite element time domain method and the Josephson junction subsystem with a finite difference method, with leap-frog time marching used to evolve the system in time. We validate our method by comparing the computed gain to an analytical model for a traditional JTWPA architecture and one with resonant phase matching. We then use our method to demonstrate the impact of variations in Josephson junctions and phase-matching resonators on amplification. In future work, the method will be adjusted to incorporate additional amplifier architectures and extended to a 3D full-wave approach.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"247-257"},"PeriodicalIF":1.8,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141965524","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

Sheet Element Approximation for Numerical Study of Current on Armature and Rail Interface 用于电枢和导轨界面电流数值研究的片元近似法

IF 1.8

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-07-03 DOI: 10.1109/JMMCT.2024.3422609

Jinghan Xu;Shengguo Xia;Lixue Chen;Chengxian Li;Hongdan Yang

{"title":"Sheet Element Approximation for Numerical Study of Current on Armature and Rail Interface","authors":"Jinghan Xu;Shengguo Xia;Lixue Chen;Chengxian Li;Hongdan Yang","doi":"10.1109/JMMCT.2024.3422609","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3422609","url":null,"abstract":"The armature and rail (A/R) interface is an imperfect contact that is made at discrete asperities at the microscale resulting from high contact pressure. The current distribution of the interface differs significantly from the bulk behavior. In this paper, based on the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), sheet element approximation and boundary conditions are proposed to analyze the electromagnetic properties of the A/R interface. Assuming zero gradients of the magnetic vector in the thickness direction, there are two ways for the approximation, which are mathematical approximation (MA) and physical approximation (PA). Results from both methods show high agreement, consistent with results from slit boundary conditions. Current distributions on both stationary and sliding A/R interfaces are numerically investigated. On the stationary interface, current diffuses from the edges to the central part of the real contact area, whereas on the sliding interface, current concentration occurs at the trailing edge due to the velocity skin effect (VSE). Furthermore, the contour of the current distribution aligns with the erosion pattern observed in experiments, validating the accuracy of the computational method.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"228-235"},"PeriodicalIF":1.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141725682","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

Two-Dimensional Coupled Electrothermal Method Based on the Unstructured Transmission-Line Modelling Method for Lightning Protection Simulations 基于非结构化输电线路建模法的二维耦合电热法用于雷电防护模拟

IF 1.8

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-07-02 DOI: 10.1109/JMMCT.2024.3421958

Kaiqi Yan;Ana Vukovic;Phillip Sewell

引用次数: 0

Electrostatic Boundary Integral Method for 3D Structures in a Layered Conducting Medium 层状导电介质中三维结构的静电边界积分法

IF 1.8

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-06-19 DOI: 10.1109/JMMCT.2024.3416688

Stephen D. Gedney;Nastaran Hendijani;John C. Young;Robert J. Adams

引用次数: 0

LB-ADI: An Efficient Method for Transient Thermal Simulation of Integrated Chiplets and Packages LB-ADI：集成芯片和封装瞬态热模拟的高效方法

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-04-09 DOI: 10.1109/JMMCT.2024.3386842

Jie Li;Min Tang;Lin-Sheng Wu;Liguo Jiang;Wenliang Dai;Junfa Mao

引用次数: 0

A Hybrid Electromagnetic Optimization Method Based on Physics-Informed Machine Learning 基于物理信息机器学习的混合电磁优化方法

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-04-05 DOI: 10.1109/JMMCT.2024.3385451

Yanan Liu;Hongliang Li;Jian-Ming Jin

{"title":"A Hybrid Electromagnetic Optimization Method Based on Physics-Informed Machine Learning","authors":"Yanan Liu;Hongliang Li;Jian-Ming Jin","doi":"10.1109/JMMCT.2024.3385451","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3385451","url":null,"abstract":"In this article, we present an optimization method based on the hybridization of the genetic algorithm (GA) and gradient optimization (grad-opt) and facilitated by a physics-informed machine learning model. In the proposed method, the slow-but-global GA is used as a pre-screening tool to provide good initial values to the fast-but-local grad-opt. We introduce a robust metric to measure the goodness of the designs as starting points and use a set of control parameters to fine tune the optimization dynamics. We utilize the machine learning with analytic extension of eigenvalues (ML w/AEE) model to integrate the two pieces seamlessly and accelerate the optimization process by speeding up forward evaluation in GA and gradient calculation in grad-opt. We employ the divide-and-conquer strategy to further improve modeling efficiency and accelerate the design process and propose the use of a fusion module to allow for end-to-end gradient propagation. Two numerical examples are included to show the robustness and efficiency of the proposed method, compared with traditional approaches.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"157-165"},"PeriodicalIF":2.3,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10493126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140813892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient Iterative Solution of Combined Source Integral Equation Using Characteristic Basis Function Method With Initial Guess 使用带初始猜测的特征基函数法高效迭代求解组合源积分方程

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-03-28 DOI: 10.1109/JMMCT.2024.3382725

Zhiwen Dong;Xinlei Chen;Fan Gao;Changqing Gu;Zhuo Li;Wu Yang;Weibing Lu

引用次数: 0

A 3-D Spectral Element Time-Domain Method With Perfectly Matched Layers for Transient Schrödinger Equation 针对瞬态薛定谔方程的完美匹配层的三维谱元时域法

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-03-13 DOI: 10.1109/JMMCT.2024.3399911

Kangshuai Du;Shilie He;Chengzhuo Zhao;Na Liu;Qing Huo Liu

{"title":"A 3-D Spectral Element Time-Domain Method With Perfectly Matched Layers for Transient Schrödinger Equation","authors":"Kangshuai Du;Shilie He;Chengzhuo Zhao;Na Liu;Qing Huo Liu","doi":"10.1109/JMMCT.2024.3399911","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3399911","url":null,"abstract":"A spectral element time-domain (SETD) method with perfectly matched layers (PML) is proposed to simulate the behavior of electron waves, interference effects and tunneling effects, in three-dimensional (3-D) devices by solving Schrödinger equation. The proposed method employs Gauss-Lobatto-Legendre (GLL) polynomials to represent the wave function. Easy construction of higher-order element makes refinement straightforward and spectral accuracy can be obtained from the SETD. Meanwhile, by utilizing the GLL quadrature, a diagonal mass matrix is obtained which is meaningful in the time-stepping process. Numerical experiments confirm that, for open boundary problems, employing PML yields results characterized by high numerical efficiency, remarkable flexibility and ease of implementation. These findings underscore the effectiveness of SETD-PML in addressing the challenges posed by open boundary conditions, making it a reliable choice for numerical simulations. Some illustrative numerical examples are presented to demonstrate the performance of the proposed method.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"188-197"},"PeriodicalIF":2.3,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141292484","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

Coupled Mechanical and Electromagnetic Analysis of Current on Armature and Rail Interface With Dynamic Contact 带动态触点的电枢和导轨接口电流的耦合机械和电磁分析

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-03-07 DOI: 10.1109/JMMCT.2024.3397464

Jinghan Xu;Shengguo Xia;Hongdan Yang;Lixue Chen

{"title":"Coupled Mechanical and Electromagnetic Analysis of Current on Armature and Rail Interface With Dynamic Contact","authors":"Jinghan Xu;Shengguo Xia;Hongdan Yang;Lixue Chen","doi":"10.1109/JMMCT.2024.3397464","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3397464","url":null,"abstract":"The electrical contact between the armature and rail (A/R) in a railgun is acknowledged as a dynamic sliding interface, exhibiting properties distinct from bulk. This paper employs a 3-D finite element method (FEM) for coupled mechanical and electromagnetic analysis and proposes boundary conditions for dynamic sliding contact to investigate current distribution on the A/R interface. Results show that contact pressure and area have similar trends as the driving current, which confines current distributed areas. The current distributions on stationary and sliding interfaces reveal different patterns but the distributed areas both locate within the contact areas. In the case of the stationary scenario, the current concentrates at the trailing edge when the current increases and diffuses to the leading edge when the current declines. However, due to the velocity skin effect (VSE), the current fails to diffuse into the interior during all stages. Besides, comparative calculations with constant contact indicate that forced shifts of current occur when the contact is dynamic, dominating the current distributions of the A/R interface. Moreover, the influence of the VSE on forced shifts of current is notable, with significant current variations observed near the trailing edge, whereas those around the leading edge are less pronounced.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"198-207"},"PeriodicalIF":2.3,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141292551","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

Equivalent Circuit Model Development Accounting for Mutual-Coupling Effects 考虑相互耦合效应的等效电路模型开发

IF 2.3

IEEE Journal on Multiscale and Multiphysics Computational Techniques Pub Date : 2024-03-06 DOI: 10.1109/JMMCT.2024.3396801

Chandan Roy;Ke Wu

{"title":"Equivalent Circuit Model Development Accounting for Mutual-Coupling Effects","authors":"Chandan Roy;Ke Wu","doi":"10.1109/JMMCT.2024.3396801","DOIUrl":"https://doi.org/10.1109/JMMCT.2024.3396801","url":null,"abstract":"Mutual-coupling effects are of utmost importance in the development of high-frequency circuits and systems. However, it is a common practice to ignore those couplings when establishing equivalent circuit models. Neglecting these couplings leads to inaccurate circuit modelling. Therefore, it becomes imperative to account for mutual couplings in the development of accurate equivalent circuit models. This work presents a holistic process for synthesizing the equivalent circuit model of an electromagnetic (EM) field structure that incorporates mutual couplings of varying orders. The proposed high-order framework begins by developing equivalent circuit models for each individual transmission line discontinuity within the target circuit. Subsequently, the mutual couplings of different orders are extracted in a step-by-step manner. Throughout this process, full-wave EM simulations are deployed, along with a circuit parameter extraction method that utilizes de-embedded circuit responses. By combining these techniques, a comprehensive and accurate equivalent circuit model is generated, enabling a detailed analysis of the target field model structure, and facilitating a deeper understanding of its electrical and magnetic behavior and performance. This paper utilizes a three-step microstrip discontinuity structure and a third-order parallel coupled microstrip filter as examples for theoretical and experimental demonstration of the proposed technique.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"9 ","pages":"166-178"},"PeriodicalIF":2.3,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140919115","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