检索结果-南通市图书馆

A Symmetric Inertial Alternating Direction method of Multipliers for Elliptic Equation Constrained Optimization Problem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2022年第3期14卷 596-621页

作者： MengyueWu Wenbao Ai Jianhua Yuan Hui Tian School of Science Beijing University of Post and TelecommunicationsBeijing 100876China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

A new algorithm,called symmetric inertial alternating direction method of multipliers(SIADMM),is designed for separable convex optimization problems with linear constraints in this *** convergence rate of the SIADMM is proved to be O(1/√k).Two kinds of elliptic equation constrained optimization problems,the un-constrained cases as well as the box-constrained cases of the distributed control and the Robin boundary control,are analyzed theoretically and solved ***,the existence and uniqueness of the solutions to these problems are ***,these continuous optimization problems are transformed into discrete optimization problems by theﬁnite element method,and then the discrete optimization problems are solved by the proposed *** experiments with different problems are investigated to demonstrate the efﬁciency of the *** the numerical per-formance of the SIADMM is better than the performance of the ***,the numerical results show that the convergence rate of the SIADMM tends to be faster than O(1/√k)in calculation process.

关键词： Symmetric inertial alternating direction method of multipliers convergence rate elliptic equation constraint ﬁnite element method

Parallel Iterative FEM Solver with Initial Guess for Frequency Domain Electromagnetic Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第5期36卷 1585-1602页

作者： Woochan Lee Woobin Park Jaeyoung Park Young-Joon Kim Moonseong Kim Department of Electrical Engineering Incheon National UniversityIncheon22012Korea Department of Computer Engineering Hongik UniversitySeoul04066Korea Department of Electronic Engineering Gachon UniversitySeongnam13120Korea Department of IT Convergence Software Seoul Theological UniversityBucheon14754Korea

The finite element method is a key player in computational electromag-netics for designing RF(Radio Frequency)components such as *** frequency-domain analysis is fundamental to identify the characteristics of the *** the conventional frequency-domain electromagnetic analysis using FEM(Finite element method),the system matrix is complex-numbered as well as indeﬁ*** iterative solvers can be faster than the direct solver when the solver convergence is guaranteed and done in a few ***,such complex-numbered and indeﬁnite systems are hard to exploit the merit of the iterative *** is also hard to beneﬁt from matrix factorization techniques due to varying system matrix parts according to ***,it is hard to adopt conventional iterative solvers even though the system matrix is sparse.A new parallel iterative FEM solver for frequency domain analysis is implemented for inhomogeneous waveguide structures in this *** this implementation,the previous solution of the iterative solver of Matlab(Matrix Laboratory)employ-ing the preconditioner is used for the initial guess for the next step’s solution *** overlapped parallel stage using Matlab’s Parallel Computing Toolbox is also proposed to alleviate the cold starting,which ruins the convergence of early steps in each parallel *** experiments based on waveguide structures have demonstrated the accuracy and efﬁciency of the proposed scheme.

关键词： Computational electromagnetics numerical simulation ﬁnite element method parallel processing iterative solvers

Investigation of the Effect of the Force Arm on the Bending Capability of Prestressed Glulam Beam

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2024年第5期18卷 641-661页

作者： Yan Zhao Yuanyuan Wu Shengliang He Zhenglu Gao Ziyan Huang Chenzheng Lv Department of Civil Engineering and Architecture Wuyi UniversityWuyishan354300China Experimental Forest Farm in Qingyuan County Lishui323000China Fujian Zhuanghe Bamboo Industry Technology Co. Ltd.Nanping353000China Fujian Liuzheng New Materials Technology Co. Ltd.Nanping353000China

Prestress enables the Glulam beam could make full use of the compression strength,and then increase the span,but it still could not reduce all drawbacks,such as cross-section weakening and small force *** avoid slotting and ensure suitable tension and compression couple,one kind of novel anchor has been proposed,which could meet the bearing capacity *** then the bending test of prestressed Glulam beams with a geometric scale ratio of 1:2 was simulated,to investigate the effect of the force arm on bending capacities,failure modes,and deformation *** show that increasing the force arm could improve the ultimate bending per-formance of the beam signiﬁcantly,and the anchor arm length has a certain effect on the performance,but it is not ***,based on Finite element method analysis,the practice design suggestions have been offered.

关键词： Force arm prestressed Glulam beam ﬁnite element method bearing capacity

Superconvergence of Finite element Approximations of the Two-Dimensional Cubic Nonlinear Schrodinger Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2022年第3期14卷 652-665页

作者： Jianyun Wang Zhikun Tian School of Science Hunan University of TechnologyZhuzhouHunan 412007China School of Computational Science and Electronics Hunan Institute of EngineeringXiangtanHunan 411104China

The superconvergence of a two-dimensional time-independent nonlinear Schrodinger equation are analyzed with the rectangular Lagrange typeﬁnite element of order ***,the error estimate and superclose property are given in H^(1)-norm with order O(h^(k+1))between theﬁnite element solution u_(h) and the interpolation func-tion uI by use of the elliptic projection ***,the global superconvergence is obtained by the interpolation post-processing *** addition,some numerical examples with the order k=1 and k=2 are provided to demonstrate the theoretical analysis.

关键词： Superconvergence nonlinear Schrodinger equation ﬁnite element method elliptic projection

Numerical Investigation on Vibration Performance of Flexible Plates Actuated by Pneumatic Artificial Muscle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sound & Vibration 2022年第4期56卷 307-317页

作者： Zhimin Zhao Jie Yan Shangbin Wang Yuanhao Tie Ning Feng School of Electrical and Mechanical Engineering Pingdingshan UniversityPingdingshan467000China Henan Province Engineering Research Center of Ultrasonic Technology Application Pingdingshan UniversityPingdingshan467000China College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin150040China School of Mechanical and Transportation Engineering Guangxi University of Science and TechnologyLiuzhou545006China College of Mechanical and Electrical Engineering Xinjiang Agricultural UniversityUrumchi830052China

This paper theoretically introduced the feasibility of changing the vibration characteristics ofﬂexible plates by using bio-inspired,extremely light,and powerful Pneumatic Artiﬁcial Muscle(PAM)*** structural plates or shells are typicallyﬂexible and show highvibration *** this reason,this paper provides a way toachieve active vibrationcontrolfor suppressing the oscillations ofthese structuresto meet strict stability,safety,and comfort *** dynamic behaviors of the designed plates are modeled by using theﬁnite element(FE)*** is known,the output force *** curve of PAM is nonlinear *** this presentﬁnite element model,the maximum forces provided by PAM in different air pressure are adopted as controlling forces for applying for the *** non-linearity between the output force and displacement of PAM is avoided in this *** dynamic behaviors of plates with several independent groups of controlling forces are observed and *** results show that the natural frequencies of the plate can be varying and the max amplitude decreases signiﬁcantly if the controlling forces are *** present work also demonstrates the potential of the PAM actuators as valid means for damping out the vibration ofﬂexible systems.

关键词： Pneumatic artiﬁcial muscle active vibration control ﬁnite element method composite plate