检索结果-内蒙古大学图书馆

Geometrically Nonlinear Deformation Reconstruction Based on iQS4 Elements Using a Linearized iterative iFEM algorithm

引用

Acta Mechanica Solida Sinica 2023年第1期36卷 166-180页

作者： Mengying Li Dawei Jia He Huang Ziyan Wu Adnan Kefal School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710129China Faculty of Engineering and Natural Sciences Sabanci UniversityTuzlaIstanbul 34956Turkey Integrated Manufacturing Technologies Research and Application Center Sabanci UniversityTuzlaIstanbul 34956Turkey

Structural shape monitoring plays a vital role in the structural health monitoring *** inverse finite element method(iFEM)has been demonstrated to be a practical method of deformation reconstruction owing to its unique *** iFEM formulations have been applied to small deformation of structures based on the small-displacement assumption of linear ***,this assumption may be inapplicable to some structures with large displacements in practical ***,geometric nonlinearity needs to be *** this study,to expand the practical utility of iFEM for large displacement monitoring,we propose a nonlinear iFEM algorithm based on a four-node inverse quadrilateral shell element *** the advantage of an iterative iFEM algorithm,a nonlinear response is linearized to compute the geometrically nonlinear deformation reconstruction,like the basic concept of nonlinear FE *** examples are solved to verify the proposed *** is demonstrated that large displacements can be accurately estimated even if the in-situ sensor data includes different levels of randomly generated *** is proven that the nonlinear iFEM algorithm provides a more accurate displacement response as compared to the linear iFEM methodology for structures undergoing large ***,the proposed approach can be utilized as a viable tool to effectively characterize geometrically nonlinear deformations of structures in real-time applications.

关键词： Deformation reconstruction iQS4 element iterative algorithm Nonlinear iFEM Geometric nonlinearity

来源：评论

学校读者我要写书评

暂无评论

An iterative algorithm for POD basis adaptation in solving parametric convection-diffusion equations

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 391卷 114498-114498页

作者： Wu, Zhizhang Zhang, Zhiwen Univ Hong Kong Dept Math Pokfulam Rd Hong Kong Peoples R China

In this paper, we develop an iterative algorithm for proper orthogonal decomposition (POD) basis adaptation in solving linear parametric PDEs. Specifically, we consider the convection-diffusion equations with diffusivity as a parameter. To construct POD basis functions for the convection-diffusion equation with a small diffusivity, we need a fine-grid solver to obtain accurate solution snapshots, which leads to a large amount of computation and memory costs. Meanwhile, a coarse-grid solver is sufficient for obtaining accurate solution snapshots for the convection-diffusion equation with a large diffusivity. We aim to adapt the POD basis functions extracted from the solution snapshots of a large diffusivity for the construction of a reduced order model at a small diffusivity without resorting to a fine-grid solver. Our POD basis adaptation method exploits the implicit dependence of solutions on diffusivity. The POD basis functions are adapted through an iterative algorithm, where the full-order model simulation at a large diffusivity and the POD-based reduced-order model simulation at a small diffusivity are implemented, alternatively. We also provide convergence analysis for our POD basis adaptation method. The algorithm and convergence analysis can be generalized to other types of linear parametric PDEs without any difficulty. Finally, we present numerical results to demonstrate the performance and accuracy of the proposed method.(c) 2021 Elsevier B.V. All rights reserved.

关键词： Convection-diffusion equations Model reduction Basis adaptation Proper orthogonal decomposition (POD) method iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

Separable joint gradient-based iterative algorithm for multi-frequency sine signals 33

Separable joint gradient-based iterative algorithm for multi...

引用

33rd Chinese Control and Decision Conference (CCDC)

作者： Xu, Ling Wuxi Vocat Inst Commerce Sch Internet Things Technol Wuxi 214153 Jiangsu Peoples R China

ISBN: (纸本)9781665440899

This paper considers a problem of signal modeling for multi-frequency signals. Because many characteristic parameters are contained in the multi-frequency signals, it is difficult to obtain these estimates of these characteristic parameters. According to the different relations between the signal output and the amplitude parameters and frequency parameters of the multi-frequency sine signal, the signal parameters are divided into two parameter sets. In terms of these two different parameter sets, two identification sub-models are constructed for deriving two identification sub-algorithms by means of the gradient search and iterative technique. By uniting two identification algorithms, a joint gradient-based iterative signal modeling method is presented for estimating the total parameters of the multi-frequency sine signal. The performance of the proposed signal modeling method is validated through the computer simulations.

关键词： Signal processing Gradient search Parameter estimation iterative algorithm multi-frequency sine signal

来源：评论

学校读者我要写书评

暂无评论

An iterative algorithm to approximate the solution of a weighted fractional integral equation

引用

ASIAN-EUROPEAN JOURNAL OF MATHEMATICS 2024年第1期17卷

作者： Das, Anupam Rabbani, Mohsen Hazarika, Bipan Cotton Univ Panbazar Dept Math Gauhati 781001 Assam India Islamic Azad Univ Dept Math Sari Branch Sari Iran Gauhati Univ Dept Math Gauhati 781014 Assam India

In this paper, we present a new version of Darbo's theorem to establish the solvability of a weighted fractional integral equation with respect to another function. To justify the validity of our results, a suitable example is provided and we construct an iterative algorithm by Sinc function to approximate the solution of the example.

关键词： Functional integral equations weighted fractional integral measure of noncompactness fixed point theorem (FPT) Sinc function iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of generalised Maxwell-type viscous dampers with an efficient iterative algorithm

引用

MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2022年第0期170卷 108795-108795页

作者： Chang, Theodore L. Lee, Chin-Long Univ Canterbury Dept Civil & Nat Resources Engn Christchurch 8041 New Zealand

In this work, an extended numerical model for viscous dampers, which can be deemed as a generalised Newtonian fluid model, is proposed based on the conventional power-law fluid viscosity. With a flexible definition of damping coefficient, a wide range of damper response can be simulated using the new damper model. An efficient direct integration algorithm with an iterative scheme is proposed for the state determination of the corresponding Maxwell model that employs the proposed dashpot and spring with either elastic or elastoplastic response. Compared to an ODE solver based approach, which has limitations in terms of applicability/accuracy, compatibility/consistency and efficiency/robustness, the proposed algorithm has a higher computational performance and is less sensitive to numerical instability issues. The proposed viscous damper model and the state determination algorithm can be readily used in simulations of various damped dynamic systems.

关键词： Rate-dependent viscous damper Maxwell model iterative algorithm Response history analysis Negative-stiffness

来源：评论

学校读者我要写书评

暂无评论

Existence of solution for two dimensional nonlinear fractional integral equation by measure of noncompactness and iterative algorithm to solve it

引用

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2020年第0期370卷 112654-000页

作者： Rabbani, Mohsen Das, Anupam Hazarika, Bipan Arab, Reza Islamic Azad Univ Dept Math Sari Branch Sari 19318 Iran Rajiv Gandhi Univ Dept Math Rono Hills Doimukh 791112 Arunachal Prade India Gauhati Univ Dept Math Gauhati 781014 Assam India

In this article, we establish the existence of solution for two dimensional nonlinear fractional integral equation using fixed point theorem and measure of noncompactness. Applicability of our results is shown by some examples and for validity of the proposed method we make an iterative algorithm by semi-analytic technique that finds a closed form of the solution with an acceptable accuracy. Ability of the proposed method is granted by comparison with another method found in existing literature. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Fractional integral equation Fixed point theorem Measure of noncompactness iterative algorithm Semi-analytic method

来源：评论

学校读者我要写书评

暂无评论

Dynamic Analysis of Tram Vehicles Coupled With the Track System Based on Staggered iterative algorithm

引用

JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS 2020年第6期15卷 061002页

作者： Shan Yao Wang Binglong Zhou Shunhua Zhang Jiawei Huang Aijun Tongji Univ Shanghai Key Lab Rail Infrastruct Durabil & Syst Key Lab Rd & Traff Engn Minist Educ Caoan Highway 4800 Shanghai 201804 Peoples R China Shanghai Urban Construct Design & Res Inst Dongfang Rd 3447 Shanghai 200125 Peoples R China

In recent years, a large number of tram-tracks have been constructed in typical soft soil area of China. Infrastructure defects due to the differential foundation settlement are serious issues in this area. To ensure the operation safety of the tram, the influence of different infrastructure defects on the dynamic response of the tram-track system has been investigated in this paper. A dynamic model of a five-module 100% low-floor tram vehicle coupled with a slab track system is developed based on a finite element (FE) method and multibody kinematics. The articulation between different vehicle modules, the wheel-rail nonlinear contact, pad failures, and a cavity in the subgrade have been taken into account in this model. The dynamic response of the vehicle-track coupling system to different operation speeds and infrastructure defects are calculated. Results indicate that the vibration energy of the vehicle body is mainly distributed in the frequency range below 1.5 Hz. This frequency range should be paid special attention in the durability design for the vehicle structure. When the number of the failure pads is larger than 3, the pad failure in tram-track has significant influence on the system dynamic response. A cavity in subgrade has a limited effect on high frequency vibrations (above 100 Hz) of the rail, while the low frequency vibrations (below 75 Hz) of the rail can be obviously increased by cavities in subgrade. The model can be used in the optimization of suspension parameters and the tram vehicle-track coupled vibration analysis.

关键词： tram-track vehicle-track interaction iterative algorithm pad failure differential settlement

来源：评论

学校读者我要写书评

暂无评论

A Simple and Effective iterative algorithm for Elliptic Localization

IEEE SENSORS LETTERS

引用

IEEE SENSORS LETTERS 2022年第10期6卷 1页

作者： Wu, Liehu Zou, Yanbin Fan, Jingna Shantou Univ Dept Elect Informat Engn Shantou 515063 Peoples R China

Elliptic localization, where a transmitter illuminates the target of interest and multiple receivers collect the reflected signal to determine its position, appears in many practical applications. In this letter, we propose a simple and effective iterative algorithm for locating a target using the time-delay measurements from the indirect paths. The proposed algorithm, which only requires addition, multiplication, and root-squares, has a lower complexity. Unlike most existing schemes, the proposed algorithm does not has approximation in its derivation. Moreover, a multiple initial values scheme is designed to improve the robustness of the algorithm. Simulation results verify that the proposed algorithm outperforms the existing approaches.

关键词： Transmitters Receivers Location awareness iterative methods Sensors Cost function Approximation algorithms Sensor signal processing sensor applications elliptic localization iterative algorithm time-delay measurements

来源：评论

学校读者我要写书评

暂无评论

An Extended Integral Unit Commitment Formulation and an iterative algorithm for Convex Hull Pricing

引用

IEEE TRANSACTIONS ON POWER SYSTEMS 2020年第6期35卷 4335-4346页

作者： Yu, Yanan Guan, Yongpei Chen, Yonghong Univ Florida Gainesville FL 32611 USA MISO Carmel IN 46032 USA

To increase market transparency, independent system operators (ISOs) have been working on minimizing uplift payments based on convex hull pricing theorems. Along this direction, in this paper, based on the analysis of specific generator features in the Midcontinent ISO (MISO) system, besides reviewing integral formulations for several special cases, we develop two integral formulations of a single generator that can capture these features. We then build a compact convex hull pricing formulation based on these integral formulations, which guarantees to obtain an exact convex hull price by solving a large-scale linear program. Meanwhile, to address the computational challenges caused by the large-scale MISO system, we propose innovative iterative algorithms with convergence properties, plus a complementary algorithm, to obtain an approximated convex hull price. The case studies on MISO instances with and without transmission constraints indicate that our algorithms lead to an exact convex hull price for all numerical studies and, the solutions can be obtained within 20 minutes.

关键词： Generators MISO communication Pricing iterative methods ISO Production Time factors Convex hull pricing iterative algorithm integral formulation

来源：评论

学校读者我要写书评

暂无评论

The periods and periodic solutions of nonlinear jerk equations solved by an iterative algorithm based on a shape function method

引用

APPLIED MATHEMATICS LETTERS 2020年 102卷 106151-000页

作者： Liu, Chein-Shan Chang, Jiang-Ren Hohai Univ Coll Mech & Mat Nanjing 210098 Jiangsu Peoples R China Natl Taiwan Ocean Univ Ctr Excellence Ocean Engn Ctr Excellence Oceans Keelung 20224 Taiwan Natl Taiwan Ocean Univ Dept Syst Engn & Naval Architecture Keelung 20224 Taiwan

The present paper develops two iterative algorithms to determine the periods and then the periodic solutions of nonlinear jerk equations. We consider two possible cases: initial values unknown and initial values given. A shape function method is introduced, by which we can transform the periodic problem to an initial value problem for the new variable, while the period and the terminal values of the new variable at the end of a period are determined iteratively. The initial value problem method (IVPM) can satisfy the periodic conditions exactly. Three examples reveal the advantages of the new iterative algorithms based on the IVPM, which converge fastly and also provide very accurate periodic solutions and periods of the nonlinear jerk equations. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Nonlinear jerk equations Periodic problem Shape function Initial value problem method iterative algorithm

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：