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SSRN 2023年

作者： Wang, Zuojiang Cao, Ziqi Wu, Mengjie Li, Yuanming Ran, Guang College of Energy Xiamen University Fujian Province Xiamen City361102 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610213 China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen361102 China Nuclear Power Institute of China Chengdu610213 China

Al-based composites containing high neutron absorption cross section elements are the most promising shielding materials for spent fuel storage, but their irradiation performance is the key to their long-term service stability. In the present work, an in-situ study on the evolution and characteristics of irradiation defect clusters including dislocation loops, gas bubbles and hydrogen platelets in Al-based Gd2O3-W composites during 30 keV H2+ irradiation was carried out in a transmission electron microscope and analyzed in detail. The delamination of bubbles and the formation of tunnel structure in Al matrix were found for the first time. Hydrogen platelets in Al5W particles was first observed, and their formation and evolution and corresponding mechanism were investigated in detail. Platelets with different orientation had different growth rates, and the relationship between growth rate and dose was constructed. Besides, the irradiation-induced increment of yield strength in Al matrix was estimated. This study will provide new insights for the design and development of new Al-based rare earth composites with high resistance to irradiation damage. © 2023, The Authors. All rights reserved.

关键词： Platelets

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Fractional Order Sliding-Mode Observer for Speed and Flux of Induction Motor 11th

Fractional Order Sliding-Mode Observer for Speed and Flux of...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Zhou, Minghao Jia, Mingzhe Wang, Dong Chen, Jiaxin Wu, Weiwei Chi, Ying Yu, Shaohuo School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin150080 China Suzhou Huichuan United Power System Co. Ltd. Suzhou215128 China The China Ship Development & Design Institute Wuhan430064 China Zhejiang Fengli Grinding Equipment Co. LTD Shengzhou312400 China

ISBN: (纸本)9789819788231

A speed-flux observer for the induction motor (IM) based on the fractional order sliding mode (FOSM) is proposed in this paper. Aiming at the problems of system parameter variation, external disturbance, and chattering, a new FOSM observer is designed. The anti-interference of the observer is improved, at the same time, the flux and speed of the motor are estimated, and the smoothness of the output of the estimation curve is improved, so that the estimation results haven shown high accuracy and advantages in dynamic response. Finally, the effectiveness and flexibility of the proposed FOSM method are proved by experiment results. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sliding mode control

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Revealing Controllable Zn2sio4 Nanotube Transformation Through Kirkendall Effect for Rram Application

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SSRN 2024年

作者： Huang, Chun-Wei Liao, Yi-Ju Shi, Wen-Wei Huang, Bang Hao Chang, Po-Hsueh Lin, Ru-Zheng Department of Materials Science and Engineering Feng Chia University Taichung City407 Taiwan MSSCORPS CO. LTD Taiwan Chip Technology & Design Division Electronic and Optoelectronic System Research Laboratories Industrial Technology Research Institute Taiwan Specialty Semiconductor Technology Department Chip Technology & Design Division Research Laboratories Industrial Technology Research Institute Taiwan

Recent research on transition metal oxides has gradually shifted towards developing more diverse ternary phases in one-dimensional functional metal oxides. Among these, Zn-based ternary phases have been prominent, with Zn2SiO4 materials being an important development material. Its various applications have garnered significant attention, but research in the field of resistive memory is still lacking. Therefore, this study focuses on one-dimensional ternary Zn2SiO4 nanotubes through a meticulous solid reaction synthesis and their resistive random-access memory (RRAM) application. The surface morphology and crystal structure of nanotubes are systematically investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). This study exposed single-crystal Zn2SiO4 nanotubes successfully synthesized after a careful annealing process at 900°C for three hours, which exhibit bipolar resistive switching behavior and simultaneously display resistive switching mechanisms involving electro-chemical metallization (ECM) and valence change mechanism (VCM). This promising result suggests a potential breakthrough in the field of resistive memory devices, inspiring further research and development. © 2024, The Authors. All rights reserved.

关键词： Silicates

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Integrated optimization design of smart morphing wing for accurate shape control

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Chinese Journal of Aeronautics 2021年第1期34卷 135-147页

作者： Xiaojun GU Kaike YANG Manqiao WU Yahui ZHANG Jihong ZHU Weihong ZHANG Unmanned System Research Institute Northwestern Polytechnical UniversityXi'an 710072China State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Poly technical UniversityXi'an 710072China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China

Smart morphing wing, which is equipped with smart materials and able to change structural geometry adaptively, can further improve aerodynamic efficiency of aircraft. This paper presents a new integrated layout and topology optimization design for morphing wing driven by shape memory alloys(SMAs). By simultaneously optimizing the layout of smart actuators and topology of wing substrate, the ultimately determined configuration can achieve smooth, continuous and accurate geometric shape changes. In addition, aerodynamic analysis is carried out to compare smart morphing wing with traditional hinged airfoil. Finally, the optimized smart wing structure is constructed and tested to demonstrate and verify the morphing functionality. Application setbacks are also pointed out for further investigation.

关键词： Layout optimization Morphing wing Shape memory alloy Shape morphing Topology optimization

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High-Precision Positioning with Continuous Delay and Doppler Shift using AFT-MC Waveforms

High-Precision Positioning with Continuous Delay and Doppler...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Cong Yi Haoran Yin Xianjie Lu Yanqun Tang Fan Liu School of Electronics and Communication Engineering Sun Yat-sen University China School of System Design and Intelligent Manufacturing Southern University of Science and Technology China

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

This paper explores a novel integrated localization and communication (ILAC) system using the affine Fourier transform multicarrier (AFT-MC) waveform. Specifically, we consider a multiple-input multiple-output (MIMO) AFT-MC system with ILAC and derive a continuous delay and Doppler shift channel matrix model. Based on the derived signal model, we develop a two-step algorithm with low complexity for estimating channel parameters. Furthermore, we derive the Cramér-Rao lower bound (CRLB) of location estimation as the fundamental limit of localization. Finally, we provide some insights about the AFT-MC parameters by explaining the impact of the parameters on localization performance. Simulation results demonstrate that the AFT-MC waveform is able to provide significant localization performance improvement compared to orthogonal frequency division multiplexing (OFDM) while achieving the CRLB of location estimation.

关键词： Location awareness Doppler shift Maximum likelihood estimation Lower bound Parameter estimation OFDM Simulation Approximation algorithms MIMO Delays

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High-order Fully Actuated Approach for Output Position Control of Two Mass systems based on Extended State Observer

High-order Fully Actuated Approach for Output Position Contr...

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Fully Actuated system Theory and Applications (CFASTA), Conference on

作者： Ping Li Guang-Ren Duan Bi Zhang Yuzhong Wang Shenzhen Key Laboratory of Control Theory and Intelligent Systems School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798350373691

ISBN: (纸本)9798350373707

This paper proposes a high-order fully actuated (HOFA) control approach for the output position control of two-mass systems (TMSs) based on extended state observer (ESO). TMSs belongs to a class of underactuated mechanical systems, which can be converted into an HOFA model using variable elimination. Based on the feature of HOFA model, it is extremely simple to solve the position control law such that a desired tracking error system can be achieved. To handle the control issues of high-order derivatives and unknown disturbances, a linear ESO is employed for state estimation and active disturbance rejection control, where the lumped disturbance is treated as an extended system state. The theoretical stability of control system is analyzed with the help of sliding manifold. Comparative simulations are performed to demonstrate the effectiveness of the proposed approach.

关键词： Robust control Uncertain systems Simulation Position control Observers Control systems Stability analysis

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66-3:Invited Paper:Standardizations of Ergonomics for Head Mounted Displays (HMDs)

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SID Symposium Digest of Technical Papers 2024年第1期55卷 913-916页

作者： Hiroyasu Ujike Kei Hyodo Mitsunori Tada Hiroshi Watanabe Tokyo Information Design Professional University(TID) Tokyo Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan Yuasa System Co. Ltd Okayama Japan

The recent main topics in ISO/TC159/SC 4/WG 2 and /WG12, which are in charge of display ergonomics in the International Organization for Standardization (ISO), is ergonomics of head-mounted displays (HMDs) realizing XR or Cross-Reality, which has attracted attention in recent years. The paper overviews the major issues related to visual comfortability and Image Safety using HMDs, and reports on the key points for standardization to reduce VR sickness and to maintain comfortable viewing of 3D images.

关键词： ISO human-system interaction ergonomics head mounted display 3D images VR sickness visual fatigue Image Safety

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BDGSE: A Symbolic Execution Technique for High MC/DC

BDGSE: A Symbolic Execution Technique for High MC/DC

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IEEE International Conference on Software Quality, Reliability and Security (QRS)

作者： Huangli Cai Zhiyi Zhang Yifan Jian Dan Li Zhiqiu Huang Collage of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Ministry Key Laboratory for Safety-Critical Software Development and Verification Nanjing University of Aeronautics and Astronautics Nanjing China

Modified Condition/Decision Coverage (MC/DC) is a test coverage standard with excellent fault detection capability, which is widely used in testing safety-critical software. Symbolic execution generates test cases automatically to achieve high code coverage. However, since symbolic execution uses short-circuit evaluation to evaluate decisions, it fails to guarantee the consistency of other conditions in a decision required by the MC/DC criterion. As a result, it is incapable of generating MC/DC test cases to test safety-critical systems adequately. To solve this problem, we propose Branch Dependence Guided Symbolic Execution (BDGSE), a symbolic execution technique for high MC/DC. The approach utilizes static analysis to compute the branch dependencies, then guides symbolic execution to selectively explore paths and simplify test cases, and finally generates a small number of test cases to achieve high MC/DC coverage. Our experimental results show that BDGSE can generate high-quality test cases. Although BDGSE generates fewer test cases, it can achieve higher MC/DC coverage than SPF and random methods, and the fault detection capability of test cases generated by BDGSE is comparable to that of test cases generated by SPF.

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Data-driven modeling fast-slow coupling delayed dynamics using noisy data and sparse enhancement 5

Data-driven modeling fast-slow coupling delayed dynamics usi...

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5th International Conference on Industrial Artificial Intelligence, IAI 2023

作者： Tang, Huifang Wu, Yuqiang Dong, Yingming Cheng, Cheng Li, Xiuting Huazhong Agricultural University College of Science Wuhan China Yunnan Mechanical Research and Design Institute of Machinery Research Institute Group Yunnan Key Laboratory of Mechatronics Applied Technology Yunnan China Ministry of Education of China Huazhong University of Science and Technology Autonomous Intelligent Unmanned System Engineering Research Center Wuhan430074 China Huazhong University of Science and Techonology School of Artificial Intelligence and Automation Wuhan430074 China

ISBN: (纸本)9798350325294

In this work, we focus on fast-slow delayed dynamical systems, which are usually described by coupled delayed differential equations with two-time scales. The purpose of this article is to propose a data-driven discovery method to identify the fast-slow delayed differential equations from noisy measurements. The proposed method blends delay dictionary-based sparse identification of nonlinear dynamics (SINDy) framework and a fixed interval sampling strategy. Specifically, we leverage the SINDy methodology to describe the fast-slow delayed differential equations by a few active terms of a large dictionary containing the delay terms and many candidate nonlinear basis functions. To identify the active terms and the corresponding coefficients, a sequential thresholded re-weighted 2 least squares algorithm is used to solve the resulting sparse regression problem to enhance the sparsity. Once a sparse model with fixed delay is selected, the proposed method further estimates the delayed time by calculating the reconstruction error from the sparse model until the one that makes the reconstruction error minimum. We verify the effectiveness of the proposed method with several classical fast-slow coupling delayed systems. The experimental results show that the proposed method can well automate the fast-slow delayed differential equations from noisy data and the delayed terms also can be detected accurately. © 2023 IEEE.

关键词： Dynamical systems

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MDSTC: A Dynamic Approach to Multi-Robot Coverage Path Planning

MDSTC: A Dynamic Approach to Multi-Robot Coverage Path Plann...

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International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： Weimin Mo Zhiyun Lin School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology Shenzhen China Peng Cheng Laboratory Shenzhen China

ISBN: (数字)9798331518493

ISBN: (纸本)9798331518509

Maximizing the efficiency of multi-robot systems is one of the primary objectives in solving the multi-robot coverage path planning (mCPP) problem. During coverage tasks, unexpected imbalances in the multi-robot systems, such as changes in speed, can lead to suboptimal utilization of the system's capabilities, subsequently reducing the efficiency of task execution. In this paper, we developed a multi-robot dynamic spanning tree coverage (MDSTC) algorithm, an online area-division-based approach that adjusts region allocation among robots based on their coverage status through an exchange-based mechanism to enhance multi-robot system efficiency. To validate the effectiveness of the proposed algorithm, we conducted extensive numerical simulations. The results demonstrate that our algorithm achieves a superior solution in scenarios where robot efficiency remains balanced, closely matching the performance of state-of-the-art mCPP methods. Furthermore, when differences in efficiency arise among the robots during task execution, the proposed algorithm provides a dynamic solution that enhances overall coverage efficiency.

关键词： Automation Heuristic algorithms Numerical simulation Dynamic scheduling Path planning Multi-robot systems Resource management Robots

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