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SSRN 2024年

作者： Zhang, Baidu Qiu, Wei Liao, Xiangbiao He, Linghui Ni, Yong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Anhui Hefei230026 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China

The effects of out-of-plane deformation on atomic relaxation in twisted van der Waals bilayers are investigated by comprehensive multiscale modeling and simulations. The model integrates the DFT-informed generalized stacking-fault energy for interlayer interaction between layers and the Föppl–von Kármán plate theory for elastic energy in each layer with minimization of the total free energy for atomic relaxation governed by a gradient flow method. Our simulation results elucidate twist-angle dependent moiré pattern, strain field, tortional displacement field and stacking domain structures, in good agreement with recent experimental observations. In particular, we derive the strain soliton solution at a small twist angle and the elastic solution at a large twist angle for the reconstructed van der Waals bilayer with out-of-plane deformation. These results show that out-of-plane deformation not only narrows the strain soliton width but also induces substantial alterations in the strain field, local rotation, and stacking structures. Our findings reveal the pivotal role played by out-of-plane deformation in the atomic relaxation of twisted van der Waals bilayers, particularly at smaller twist angles. The intricate interplay between in-plane atomic relaxation and out-of-plane deformation provides opportunities for strain engineering in twisted van der Waals bilayers. © 2024, The Authors. All rights reserved.

关键词： Atoms

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Consistency Guaranteed Multi Container Migration for Smart Community Network Services

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2021年第12期141卷 1453-1461页

作者： Abeysiriwardhana, W.A.P. Shanaka Morishima, Ryo Miura, Tatsuki Nishi, Hiroaki School of Science for Open and Environmental Systems Keio University Faculty of Science and Technology Yagami Campus 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan Department of System Design Engineering Keio University Faculty of Science and Technology Yagami Campus 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan

Smart Community (SC) uses IoT sensors to provide smart grid control, traffic management, and similar IoT services. These services expect to run at the network edge or fog layer to provide low latency network services, encapsulate citizens' private information, support low-cost IoT terminals from cyber-attacks, and support other cutting-edge fog and edge services. SC edge is a service platform that supports edge/fog services for IoT terminals by using Docker containers. Initially, SC edge/fog computing nodes did not support the function of service migration. However, service migration is necessary to support remote deployment and service distribution in SC networks. The existing container migration techniques focus mainly on resource utilization. However, SC services should handle loss-free data stream processing and order-preservation of network packets to gather IoT sensor data after migration. In addition, SC services require one-to-many migration to support high throughput loads when required. Therefore, this paper focuses on enhancing SC service flexibility by introducing migration for relocatable and network consistency guaranteed containerized services. SC edge proposes multiple container migration techniques that are suitable for network services. The proposed techniques can improve resource consumption, guarantee network traffic consistency, and apply one-to-many migration patterns. Layer leveraging migration (LLM) reduces the overall migration time by 10.8% for an elastic search Docker container than available Docker migration methods. Additionally, consistency guaranteed migration (CGM) is proposed to guarantee network consistency. However, CGM consumes additional resources compared to LLM for IoT data management. Finally, One to N Consistency Guaranteed Migration (O2NCGM) is proposed to support one-to-many migration with data consistency that shows similar performance to CGM. © 2021 The Institute of Electrical Engineers of Japan.

关键词： Containers

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Adhesive-less bonding of incompatible thermosetting materials

RSC Applied Polymers

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RSC Applied Polymers 2024年第1期3卷 247-256页

作者： Khairkkar, Shhyam Pansare, Amol V. Pansare, Shubham V. Chhatre, Shraddha Y. Sakamoto, Junji Barbezat, Michel Terrasi, Giovanni P. Patil, Vishwanath R. Nagarkar, Amit A. Naito, Masanobu Data-Driven Polymer Design Group Research and Services Division of Materials Data and Integrated System (MaDIS) National Institute for Materials Science (NIMS) 1-2-1 Sengen Ibaraki Tsukuba 305-0047 Japan Composites Group Mechanical Systems Engineering Swiss Federal Laboratories for Materials Science and Technology-Empa ETH Domain Dübendorf 8600 Switzerland Department of Chemistry University of Mumbai Santacruz (E) Mumbai 400098 India National Chemical Laboratory (NCL) Dr Homi Bhabha Road Pune 411008 India Advanced Material Technology Center Technology Division Panasonic Holdings Corporation 1006 Kadoma Kadoma City Osaka 571-8508 Japan Datacule Inc. 529 Main St. Boston 02129 MA United States

We show that dynamic covalent exchange at the interface of two thermosetting polymers results in strong bonding between the materials via creation of a new material at the interface. Thus, polymers of significantly different polarities can be bonded without the use of adhesives. We also show that such dynamic covalent exchange is not only limited to the interface but also penetrates into the bulk material (ca. 20 microns), thereby creating a strong bond. The creation of a new material at the interface was confirmed by Energy Dispersive X-ray (EDX) elemental mapping as well as a new glass transition temperature at the interface. Using this phenomenon, we show that hydrophobic, compliant polymers can also be used as adhesives for polar, stiff materials. We also show that such dynamic exchange also takes place in the presence of fillers like nano-silica. Lastly, using this technique, we demonstrate the adhesive-less fabrication of layered materials where each layer has vastly different polarities and mechanical properties, thereby tuning the failures modes of the resulting composite material. © 2025 RSC.

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Coordinated Defense Allocation in Reach-Avoid Scenarios with Efficient Online Optimization

arXiv

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arXiv 2023年

作者： Liu, Junwei Ouyang, Zikai Yang, Jiahui Chen, Hua Lu, Haibo Zhang, Wei School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China Peng Cheng Laboratory Shenzhen518000 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China

In this paper, we present a dual-layer online optimization strategy for defender robots operating in multiplayer reach-avoid games within general convex environments. Our goal is to intercept as many attacker robots as possible without prior knowledge of their strategies. To balance optimality and efficiency, our approach alternates between coordinating defender coalitions against individual attackers and allocating coalitions to attackers based on predicted single-attack coordination outcomes. We develop an online convex programming technique for single-attack defense coordination, which not only allows adaptability to joint states but also identifies the maximal region of initial joint states that guarantees successful attack interception. Our defense allocation algorithm utilizes a hierarchical iterative method to approximate integer linear programs with a monotonicity constraint, reducing computational burden while ensuring enhanced defense performance over time. Extensive simulations conducted in 2D and 3D environments validate the efficacy of our approach in comparison to state-of-the-art approaches, and show its applicability in wheeled mobile robots and quadcopters. © 2023, CC BY-NC-ND.

关键词： Iterative methods

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A Feedback-inspired Super-network Shrinking Framework for Flexible Neural Architecture Search

A Feedback-inspired Super-network Shrinking Framework for Fl...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Xuan Rao Bo Zhao Derong Liu Haowei Lin School of Automation Guangdong University of Technology Guangzhou China School of Systems Science Beijing Normal University Beijing China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China School of Advanced Manufacturing Guangdong University of Technology Jieyang China

Neural architecture search (NAS) has been proved to be effective in automatically designing the architectures of deep neural networks (DNNs). Currently, most of cell-based NAS methods are subjected to the prior rules of human experts on neural architectures (e.g., the topology-sharing strategy), but it is not in line with the sustainable development of automated machine learning (Auto-ML). In this paper, a feedback-inspired super-network shrinking (FSS) method is developed under the framework of differentiable architecture search (DARTS) such that neural networks with flexible architectures are derived without strong reliance on human experts. In FSS, the information entropy is utilized to measure the sparsity of the super-network and an adaptive shrinking method is developed to balance the cross-entropy and the sparsity entropy. The experiments on CIFAR10/100 demonstrate that the proposed ESF derives a set of neural architectures with competitive performance-computation trade-offs in one single search procedure, which is superior to the state-of-the-art NAS methods.

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Distributed Robust Containment Control for Multi-Robot systems via Adaptive Critic designs

Distributed Robust Containment Control for Multi-Robot Syste...

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International Conference on Industrial Artificial Intelligence (IAI)

作者： Yongwei Zhang Haowei Lin Bo Zhao Derong Liu School of Automation Guangdong University of Technology Guangzhou China School of Advanced Manufacturing Guangdong University of Technology Jieyang China School of Systems Science Beijing Normal University Beijing China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

This article develops a distributed robust containment control approach for multi-robot systems via adaptive critic designs. To begin with, the distributed robust containment control problem of multi-robot systems with modeling uncertainties is transformed into an optimal containment control problem of its nominal plant by designing discounted value functions for all following robots. Hereafter, the distributed optimal containment control law is derived by solving the coupled Hamilton-Jacobi-Bellman equation of each following robot via the critic-only structure. Moreover, theoretical analysis shows that the developed adaptive critic design-based distributed robust containment control scheme guarantees the containment errors of all following robots to be asymptotically stable. Finally, the effectiveness of the present control approach is verified by simulation studies.

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A numerical method for predicting bursting strength of composite rocket motor case considering filament winding process-induced stress

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Chinese Journal of Aeronautics 2025年第2期 509-522页

作者： Jiqiu LIANG Fei ZHAO Dan WU Anxin DING Hubei Key Laboratory of Advanced Aerospace Propulsion Technology System Design Institute of Hubei Aerospace Technology Academy School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A numerical method to predict the bursting strength of filament wound composite rocket motor case is proposed here. This method can evaluate the longitudinal stress evolution of each composite layer as impregnated filaments with fiber tension are wound layer by layer, and consider the effects of accumulated stress and deformation during filament winding on the bursting strength of composite case. Taking ?520 mm composite cases as a case study, the filament-winding-processinduced stress and deformation as well as progressive damage behavior are numerically predicted,followed by a comparison with experimental results. The numerical results show that the predicted bursting pressures for composite cases manufactured on the mandrels with and without a flexible component are 14.20 MPa and 21.40 MPa, respectively. These values exhibit slight deviation from the measured pressures of 13.50 MPa and 21.57 MPa. Moreover, the predicted damage locations,situated respectively in the dome and cylinder, agree well with the experimental observation. These observations indicate that use of flexible component reduces the load-bearing capacity of the ***, it validates the reliability and accuracy of the proposed numerical method in predicting the bursting strength of composite cases.

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Lithium-Ion Battery State-of-Charge and State-of-Health Co-Estimation with Feasible Real-Time Implementation

Lithium-Ion Battery State-of-Charge and State-of-Health Co-E...

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Conference on Vehicle Control and Intelligence (CVCI)

作者： Mingding Shao Jian Chen Ke Xu Yong Wang School of Mechanical Engineering Zhejiang University Hangzhou China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Department of System Engineering Wanxiang Al23 Systems Corp. Hangzhou China

ISBN: (数字)9798331504892

ISBN: (纸本)9798331504908

The key to improving the efficiency of lithium-ion battery systems and reducing safety incidents is that the battery management system can accurately estimate the state of lithiumion batteries, including the state of charge and the state of health. At present, the commonly used algorithms do not achieve an effective balance between accuracy and complexity, and it is difficult to apply them in practice. Therefore, on the basis of the existing algorithms, this paper proposes to reduce the order of the equivalent circuit model, simplify the observer polynomial, achieve low computational complexity, and use a processor with limited storage to complete the estimations. The simulation and experimental results confirm that the maximum absolute error of the state of charge and state of health of the lithium-ion battery systems fully meet the requirements of practical use. Compared with the reference method, there is no obvious difference in convergence speed and stability, but the run time is relatively faster. The proposed method has a significant simplification effect.

关键词： Lithium-ion batteries Employee welfare Space vehicles Estimation Observers Polynomials Stability analysis Temperature control State of charge Thermal stability

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Modal Analysis of Lead-Bismuth Eutectic Flow in a Single Wire-Wrap Rod Channel

SSRN

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SSRN 2022年

作者： Zhao, Xielin Cheng, Qian Yu, Xiaofei Huang, Qian Zhang, Ke Feng, Zhipeng Zhou, Jinxiong State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi'an Jiaotong University Xi'An710049 China Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu610200 China

The thermal-hydraulics as well as flow-induced vibration of wire-wrapped rod bundles calls for accurate and efficient liquid metal flow simulation and prediction, yet it remains a challenge due to the complex geometries and high Reynolds number flow in wire-wrapped rod channel. Previous efforts towards this goal exclusively adopts full-order modeling (FOM), which is prohibitively computation-intensive. This work reports the first reference on modal analysis of the turbulent lead-bismuth eutectic (LBE) flow in a single wire-wrapped rod channel by a data-driven dynamic mode decomposition (DMD) method. The spatio-temporal data of fluid velocities and pressure were modelled and collected by using the Reynolds-averaged NavierStokes equations (RANS) approach with stress-omega RSM turbulence model. Model analysis was performed over the snapshot matrices and DMD modes and corresponding eigenvalues were calculated. The DMD modes and eigenvalues were then used to construct a reducedorder modeling (ROM) system for fast fluid field reconstruction and short-term forecasting. The correctness and feasibility of the method was demonstrated and compared with groundtruth CFD simulation results. Our method offers a fast and reliable approach for ROM of turbulent flow in wire-wrapped rod fuel assemblies. We publicize all the data and codes via https://***/XJTU-Zhou-group/Wire-wrapped-fuel-pin-CFD-DMD. © 2022, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

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Verification of the 2D/1D coupling 3D transport code TIGER with C5G7 benchmarks

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International Journal of Advanced Nuclear reactor design and technology 2019年 1卷 43-50页

作者： Wu, Wenbin Yu, Yingrui Li, Qing Yao, Dong Luo, Qi Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

TIGER is a 2D/1D coupling 3D transport code developed by Nuclear Power Institute of China based on large-scale parallel computation. It employs 2D domain-decomposed parallel Matrix MOC in the radial direction and 1D finite difference diffusion in the axial direction. 2D domain-decomposed parallel Matrix MOC is accelerated with multi-group and multi-domain coupled PGMRES algorithm. Generally, 2D planar problem are solved independently and parallel degree is natural in the axial direction. Combination of the parallel degrees of both radial and axial directions is adopted in TIGER to achieve the large-scale parallel computation. In this paper, a few variations of C5G7 benchmarks were created based on the published benchmarks. Reference results of these variations were provided by the Monte Carlo code RMC. To demonstrate the accuracy and efficiency of TIGER, C5G7 benchmarks and these relevant variations were calculated by TIGER, and the comparisons were made with the published results and Monte Carlo results. © 2019 Xi'an Jiaotong University

关键词： Matrix algebra

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