Computers & Structures最新文献_第6页

Approximated and neural network assisted quadratic programming and its applications in structural topology optimization 近似神经网络辅助二次规划及其在结构拓扑优化中的应用

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-05 DOI: 10.1016/j.compstruc.2025.107825

Yi Xing, Liyong Tong

{"title":"Approximated and neural network assisted quadratic programming and its applications in structural topology optimization","authors":"Yi Xing, Liyong Tong","doi":"10.1016/j.compstruc.2025.107825","DOIUrl":"10.1016/j.compstruc.2025.107825","url":null,"abstract":"<div><div>In this article, we present approximated and Neural Network assisted Quadratic Programming (NNaQP) methods to accelerate the solution process for solving the constrained and unconstrained optimization problems using gradient and Hessian matrix of objective function. Firstly, three schemes are presented for the approximation of diagonalizing inversed Hessian matrix; Secondly, the NNaQP method is presented by using the gradient online learning and prediction (GoLap) to learn and predict gradient and approximated inverted Hessian matrix. Several scaling and restoration schemes for GoLap are also proposed. The combination of NNaQP and the three approximation schemes of inversed Hessian matrix reduces the number of routine iterations involving complex derivative computing and thus decreases the total computational time. Thirdly, the three approximation schemes of the Hessian and the NNaQP are used to solve structural topology optimization problems. The performance and the benefits of approximated quadratic programming and NNaQP, in terms of prediction accuracy and the computational efficiency, are demonstrated by numerical results of solving one unconstrained minimization problem, and one 2D and one 3D minimum compliance topology optimization problems. For the selected structural topology optimization problems, the total computational timesaving can reach up to 98 %.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"316 ","pages":"Article 107825"},"PeriodicalIF":4.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robustness of a flux-intensifying permanent magnet-assisted synchronous reluctance machine focusing on shifted surface-inset ferrite magnets 聚焦于移位表面插入铁氧体磁体的磁通强化永磁辅助同步磁阻电机的鲁棒性

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-04 DOI: 10.1016/j.compstruc.2025.107845

Mihály Katona, Tamás Orosz

{"title":"Robustness of a flux-intensifying permanent magnet-assisted synchronous reluctance machine focusing on shifted surface-inset ferrite magnets","authors":"Mihály Katona, Tamás Orosz","doi":"10.1016/j.compstruc.2025.107845","DOIUrl":"10.1016/j.compstruc.2025.107845","url":null,"abstract":"<div><div>Flux-intensifying permanent magnet-assisted synchronous reluctance machines use relatively small amounts of non-rare earth permanent magnets, making them viable alternatives for remanufacturing older machines, aligning with EU directives and circular economy principles. The asymmetric rotor topology is particularly suited for micromobility applications, which benefit from shifting inset magnets, as reverse motoring is rarely required. However, this design could be more sensitive to manufacturing and positioning errors of the magnets. To investigate the effects of the uncertainties of the shifted surface inset magnets, first, an optimal topology is selected based on average torque, torque ripple, and cogging torque using the NSGA-II optimisation method. The effects of the magnet shifting and its robustness are analysed using the Taguchi and ANOVA methods, validated by Full Factorial calculations. Results indicate a 31.25 % reduction in permanent magnet volume without compromising torque output with magnet shifting. The machine’s average and cogging torque remain within a 5 % robustness threshold for a <span><math><mo>±</mo></math></span>0.06 mm discrete manufacturing tolerance. Torque ripple may exceed this limit up to 14.77 %. However, the likelihood of exceeding the threshold is only 12.10 %. The reduced magnet volume and maintained performance make this topology a promising option for remanufactured machines in micromobility applications, supporting circular economy goals.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"316 ","pages":"Article 107845"},"PeriodicalIF":4.4,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Collocation-based robust variational physics-informed neural networks (CRVPINNs) 基于配置的鲁棒变分物理信息神经网络（crvpinn）

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-03 DOI: 10.1016/j.compstruc.2025.107839

Marcin Łoś , Tomasz Służalec , Paweł Maczuga , Askold Vilkha , Carlos Uriarte , Maciej Paszyński

引用次数: 0

Explicit topology optimization for piezoelectric energy harvester with ensured connectivity of polarization profile 保证极化线连通性的压电能量采集器显式拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-03 DOI: 10.1016/j.compstruc.2025.107836

Weisheng Zhang , Qi Lai , Jian Zhang

{"title":"Explicit topology optimization for piezoelectric energy harvester with ensured connectivity of polarization profile","authors":"Weisheng Zhang , Qi Lai , Jian Zhang","doi":"10.1016/j.compstruc.2025.107836","DOIUrl":"10.1016/j.compstruc.2025.107836","url":null,"abstract":"<div><div>This paper proposes an explicit topology optimization approach for simultaneous design of both the structure and polarization profile of piezoelectric energy harvesters (PEHs), with particular emphasis on the connectivity of polarization profile. The approach is established under the Moving Morphable Component (MMC) framework. Two independent sets of MMC components are adopted to simultaneously describe the structural topology of the PEH and the polarization profile of the piezoelectric material. Resorting to the explicit geometry description of MMC, the connectivity of the polarization profile related to PEH manufacturability can be addressed in a straightforward manner using graph theory. A novel connectivity constraint is formulated by considering both connected and disconnected graphs. Meanwhile, the proposed approach is applicable to both subtractive and additive manufacturing strategies under different manufacturing processes. Some numerical examples are provided for cantilever-type PEH. The results demonstrate the effectiveness of the proposed approach in improving energy harvesting efficiency and the connectivity control of the polarization profile for PEH.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"316 ","pages":"Article 107836"},"PeriodicalIF":4.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strong form meshless analysis of solids using partially constrained polynomial finite-difference operators and overdetermined equilibrium 使用部分约束多项式有限差分算子和超定平衡的固体强形式无网格分析

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-03 DOI: 10.1016/j.compstruc.2025.107841

S. Sharma , N. Potnuru , P. Sideris

{"title":"Strong form meshless analysis of solids using partially constrained polynomial finite-difference operators and overdetermined equilibrium","authors":"S. Sharma , N. Potnuru , P. Sideris","doi":"10.1016/j.compstruc.2025.107841","DOIUrl":"10.1016/j.compstruc.2025.107841","url":null,"abstract":"<div><div>This paper proposes a new strong-form meshless method for arbitrary (non-rectangular) grids that combines a new class of finite-difference (FD) differential operators with overdetermined equilibrium. The proposed new class of FD operators combine short-range interpolation with long-range approximation over their support. Polynomial approximation is realized using weighted least squares, whereas polynomial interpolation is enforced using Lagrange multipliers. This partially constrained polynomial (PCP) FD operator is implemented through a proposed algorithm that automatically selects the stencil size and short range radius, such that the numerical error of the stencil weights due to potential ill-conditioning is below a selected tolerance. Using the PCP-FD operators, a meshless method for 2D elasto-static problems was formulated. Instabilities that are often inherent in strong form methods are addressed by introducing additional equations of field equilibrium over a set of additional points within the solid/domain. The resulting overdetermined set of equations is solved as a constrained least squares problem using Lagrange multipliers to enforce traction BCs, which bypasses the need for scaling of the traction BC equations, as is often the case in weighted collocation methods. The proposed meshless method is evaluated in several examples and is shown to achieve high accuracy that is usually better than that of the finite element method.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"316 ","pages":"Article 107841"},"PeriodicalIF":4.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A dissipative orthotropic non-local approach for objective modelling of masonry structures 砖石结构客观建模的耗散正交各向异性非局部方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-06-02 DOI: 10.1016/j.compstruc.2025.107802

Héloïse Rostagni , Cédric Giry , Frédéric Ragueneau

引用次数: 0

Corrigendum to “Multi-vehicle responses for high-resolution bridge mode shape identification integrating Kalman filter and compressive sensing” [Comput. Struct. 315 (2025) 107837] “集成卡尔曼滤波和压缩感知的高分辨率桥梁模态形状识别的多车辆响应”的勘误表[计算机]。结构。315 (2025)107837]

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-05-31 DOI: 10.1016/j.compstruc.2025.107846

Yi He , Judy P. Yang

引用次数: 0

Advanced continuation and iterative methods for slope stability analysis in 3D 三维边坡稳定性分析的先进延拓迭代方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-05-31 DOI: 10.1016/j.compstruc.2025.107842

Stanislav Sysala , Michal Béreš , Simona Bérešová , Tomáš Luber , Zdeněk Michalec

引用次数: 0

Proper generalized decomposition surrogate modeling with application to the identification of Rayleigh damping parameters 适当的广义分解代理模型及其在瑞利阻尼参数识别中的应用

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-05-29 DOI: 10.1016/j.compstruc.2025.107826

Clément Vella , Serge Prudhomme

引用次数: 0

Editorial to the special issue on “Research progress and applications of deformation reconstruction for smart sensing and Structural Health Monitoring of aerostructures” 《航空结构智能传感与结构健康监测中变形重构的研究进展与应用》专刊编辑

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-05-27 DOI: 10.1016/j.compstruc.2025.107844

Adnan Kefal (Guest Editor), Marco Gherlone (Guest Editor), Alexander Tessler (Guest Editor)

引用次数: 0