Article
Computer Science, Interdisciplinary Applications
Van-Nam Hoang, Trung Pham, Sawekchai Tangaramvong, Stephane P. A. Bordas, H. Nguyen-Xuan
Summary: This paper presents a novel robust concurrent topology optimization method for the design of uniform/non-uniform porous infills under the accidental change of loads. The method directly models multiscale structures and seeks robust designs by simultaneously optimizing macro- and microscopic structures through the minimization of the weighted sum of the expected compliance and standard deviation.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Engineering, Electrical & Electronic
Xiaolu Wang, Yuen-Man Pun, Anthony Man-Cho So
Summary: This paper investigates the problem of learning a graph from a set of noisy graph signal observations, aiming to find a graph that provides a smooth representation of the signal and is robust against uncertainties. A novel graph learning model based on distributionally robust optimization methodology is proposed, with statistical out-of-sample performance guarantees and a smooth non-convex optimization formulation. The developed projected gradient method is shown to converge. Extensive numerical experiments on synthetic and real-world data demonstrate that the proposed model outperforms existing models in terms of robustness across different populations of observed signals according to various metrics.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Weichen Li, Xiaojia Shelly Zhang
Summary: This article presents a momentum-based accelerated mirror descent stochastic approximation approach to efficiently solve robust topology optimization problems, reducing computational cost while ensuring design accuracy.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Computer Science, Hardware & Architecture
Hoon Lee, Sang Hyun Lee, Tony Q. S. Quek
Summary: This article presents a structural learning solution called PLAyDO, which models dynamic interactions among wireless devices through a series of deep neural network models. The framework identifies distributed mechanisms, such as decentralized computations and communication protocols, to handle arbitrary interaction topologies in wireless networks.
Article
Mathematics, Applied
Gourav Agrawal, Abhinav Gupta, Rajib Chowdhury, Anupam Chakrabarti
Summary: The study examines a SIMP-based robust topology optimization design for NPR metamaterials under material uncertainty, showing that RTO produces more stable designs with variations ranging from 1.72% to 2.54%, significantly lower than deterministic topology optimization.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Chemistry, Analytical
Murad Tukan, Alaa Maalouf, Matan Weksler, Dan Feldman
Summary: The study introduces an algorithm for compressing neural networks that utilizes modern techniques in computational geometry to approximate lp instead of k-rank l2 for effective compression. Experimental results confirm the practicality and theoretical advantage of this method in compressing networks such as BERT, DistilBERT, XLNet, and RoBERTa on the GLUE benchmark.
Article
Engineering, Multidisciplinary
Sheng Chu, Mi Xiao, Liang Gao, Yan Zhang, Jinhao Zhang
Summary: This paper focuses on robust topology optimization for fiber-reinforced composite structures under loading uncertainty, presenting an effective method for simultaneous optimization of fiber angles and structural topology. The study uses a new parameterization scheme and Monte Carlo simulation method to handle the optimization problem, sensitivity analysis, and Kriging metamodel for reducing computational cost.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Onat Gungor, Tajana S. Rosing, Baris Aksanli
Summary: This paper proposes a new approach for sensor placement in wireless sensor networks that takes into account the robustness of the system. Experimental results show that this method is more effective than existing approaches. The paper further improves the method by considering distance uncertainty, leading to an increased probability of target detection.
IEEE SENSORS JOURNAL
(2022)
Article
Computer Science, Artificial Intelligence
Ilker Golcuk, Fehmi Burcin Ozsoydan, Esra Duygu Durmaz
Summary: This paper introduces an improved Arithmetic Optimization Algorithm (AOA) for training artificial neural networks (ANNs) in dynamic environments. The proposed algorithm optimizes the connection weights and biases of the ANN under concept drift, outperforming state-of-the-art metaheuristic optimization algorithms in training ANNs for dynamic classification tasks. The findings demonstrate the potential of the improved AOA for dynamic data-driven applications.
KNOWLEDGE-BASED SYSTEMS
(2023)
Article
Engineering, Multidisciplinary
Seyyed Ali Latifi Rostami, Amin Kolahdooz, Jian Zhang
Summary: This research introduces a novel algorithm for robust topology optimization of continuous structures under material and loading uncertainties by combining ESO method with XFEM. The method eliminates the need for post-processing and improves reliability in material and loading uncertainty, showcasing advantages over traditional methods.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Mechanics
Xingjun Gao, Weihua Chen, Yingxiong Li, Gongfa Chen
Summary: This paper proposes an efficient method for robust multimaterial topology optimization problems of continuum structures under load uncertainty. The method minimizes the weighted sum of the mean and standard deviation of structural compliance for each material phase, separates the Monte Carlo sampling from the topology optimization procedure, and establishes an efficient procedure for sensitivity analysis. By using an alternating active-phase algorithm of the Gauss-Seidel version, the multi-material topology optimization problem is split into a series of binary topology optimization sub-problems, leading to the demonstration of the effectiveness of the proposed method through several 2D examples.
COMPOSITE STRUCTURES
(2021)
Article
Automation & Control Systems
Yunfan Zhang, Feng Liu, Yifan Su, Yue Chen, Zhaojian Wang, Joao P. S. Catalao
Summary: This paper investigates a class of two-stage robust optimization problems that involve decision-dependent uncertainties. A novel iterative algorithm based on Benders dual decomposition is proposed, which guarantees the computational tractability, robust feasibility and optimality, and convergence performance with theoretical proof. Four motivating application examples that feature decision-dependent uncertainties are provided.
IEEE-CAA JOURNAL OF AUTOMATICA SINICA
(2022)
Article
Computer Science, Interdisciplinary Applications
Subhayan De, Kurt Maute, Alireza Doostan
Summary: This paper proposes a topology optimization approach for structures made of engineered materials, taking into account uncertainty in material properties. It describes a method to optimize the structural shape and topology at the macroscale while assuming uncertain microstructures. The proposed approach proves computationally efficient and enables the consideration of new design problems that are currently beyond the reach of conventional tools.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Akatsuki Nishioka, Yoshihiro Kanno
Summary: This paper addresses a worst-case robust topology optimization problem under load uncertainty, which can be formulated as a minimization problem of the maximum eigenvalue of a symmetric matrix. The objective function is nondifferentiable when multiple maximum eigenvalues occur. To tackle the numerical instabilities caused by nondifferentiability, a smoothing method is employed. The proposed method is guaranteed to converge to a point satisfying the first-order optimality condition and has low computational cost per iteration even in large-scale problems. Numerical experiments demonstrate that the proposed method outperforms existing methods in terms of oscillation suppression and convergence speed.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Multidisciplinary Sciences
Zhengcai Li, Xinmin Hu, Chun Chen, Chenyang Liu, Yalu Han, Yuanfeng Yu, Lizhi Du
Summary: This paper investigates the optimization algorithms based on machine learning for settlement prediction. By comparing the performance of different algorithms, the study finds that Sparrow Search Algorithm (SSA) significantly improves the optimization effect of the gradient descent model and enhances its stability to a certain degree.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Vahid Keshavarzzadeh, Hadi Meidani, Daniel A. Tortorelli
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2016)
Article
Computer Science, Interdisciplinary Applications
V. Keshavarzzadeh, S. F. Masri
JOURNAL OF COMPUTATIONAL PHYSICS
(2016)
Article
Engineering, Multidisciplinary
V. Keshavarzzadeh, R. G. Ghanem, S. F. Masri, O. J. Aldraihem
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2014)
Article
Engineering, Multidisciplinary
Vahid Keshavarzzadeh, Robert M. Kirby, Akil Narayan
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2019)
Article
Engineering, Multidisciplinary
Vahid Keshavarzzadeh, Roger G. Ghanem, Daniel A. Tortorelli
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2019)
Article
Computer Science, Interdisciplinary Applications
Vahid Keshavarzzadeh, Kai A. James
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2019)
Article
Computer Science, Interdisciplinary Applications
Vahid Keshavarzzadeh, Robert M. Kirby, Akil Narayan
JOURNAL OF COMPUTATIONAL PHYSICS
(2020)
Article
Engineering, Multidisciplinary
Reza Pejman, Vahid Keshavarzzadeh, Ahmad R. Najafi
Summary: This study presents a computational framework for Hybrid Topology/Shape optimization of actively-cooled microvascular composites under uncertainty. The novel HyTopS optimization scheme allows for topological changes during shape optimization, expanding the design space beyond the initial configuration. Integration of the non-intrusive polynomial chaos expansion method provides a robust and reliable design approach that can efficiently incorporate various sources of uncertainty. Numerical examples demonstrate the advantages of the proposed optimization scheme over deterministic methods for microvascular composites, showing optimized designs under uncertainty outperform deterministic configurations in reducing sensitivity to random variables.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Vahid Keshavarzzadeh, Robert M. Kirby, Akil Narayan
Summary: Inverse problems are common in engineering simulations, and Bayesian inference is a predominant approach to infer unknown parameters. This paper presents a variational inference method that incorporates observation data and the gradient information of the forward map to invert unknown latent parameters. The method utilizes a trained neural network to generate samples for statistical calculations. The effectiveness of the method is demonstrated through examples, and future research directions are discussed.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Aerospace
Roger Ghanem, Iman Yadegaran, Charan Thimmisetty, Vahid Keshavarzzadeh, Sami Masri, John Red-Horse, Robert Moser, Todd Oliver, Pol Spanos, Osama J. Aldraihem
JOURNAL OF AEROSPACE INFORMATION SYSTEMS
(2015)