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Effects of punch size, magnetic field, and magnetorheological elastomers medium on forming T-shaped thin-walled Inconel 718 tubes

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Chinese Journal of Aeronautics 2022年第1期35卷 226-237页

作者： Qiucheng YANG Cheng CHENG Ali Abd EL-ATY Chunmei LIU Shenghan HU Yao QIN Tao LI Cong WU Yong XU Xunzhong GUO College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Jiangsu Key Laboratory of Advanced Structural Materials and Application Nanjing 211100China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

This study aims at investigating the impact of using the Magnetorheological Elastomers(MREs)medium to improve the formability of T-shaped Inconel 718 tubes during the bulging ***,the influence of the punch size and the intensity of the magnetic field on the branch height and wall thickness distribution of the T-shaped Inconel 718 tubes are also *** results showed that the parts formed by the punch with a length of 5 mm in the pressurization zone have better forming *** external magnetic field can promote a high branch,and by increasing the intensity of the magnetic field,the branch height was increased and then *** the same time,the magnetic field reduced the amount of material accumulation between the guiding zone and the bulging ***,it promotes the material in the guiding zone to enter the bulging zone and improve the bulging ability of the T-shaped tube.

关键词： Magnetic field strength Magnetorheological Elastomers(MREs) Pressurization zone T-shaped tube Wall thickness distribution

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A fast simulation method for magnetically driven deformation of a sheet micro soft robot 8

A fast simulation method for magnetically driven deformation...

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2022 8th International Conference on Mechanical Engineering, Materials and Automation technology, MMEAT 2022

作者： Gao, Jian Rong, Weibin Gao, Peng Li, Dongjie Wang, Lefeng State Key Laboratory of Robotics and System Harbin Institute of Technology Heilongjiang Harbin150001 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Heilongjiang Harbin150080 China

The magnetically driven micro soft robot is a hot research topic in the field of micro robotics. The magnetic torque of each part of the robot rotates with its deformation, so the magnetic torque and magnetic force to which the robot is subjected are difficult to be calculated directly. The lack of physical interfaces for torque distribution in many finite element software reduces the speed and accuracy of calculating the deformation of a robot using finite element simulation methods. In this paper, a fast simulation method to convert the local magnetic torque into equivalent load density for the deformation mode of the sheet micro soft robot is proposed. A finite element model of the fabricated micro soft robot is established, and the deformation and total magnetic moment of the robot under different magnetic field strength and magnetic field gradient are simulated and calculated. Experiments are executed to verify the validity of the simulation results. © Published under licence by IOP Publishing Ltd.

关键词： Robots

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ViT-based Terrain Recognition System for wearable soft exosuit

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Biomimetic Intelligence & robotics 2023年第1期3卷 57-64页

作者： Fangliang Yang Chunjie Chen Zhuo Wang Hui Chen Yao Liu Gang Li Xinyu Wua Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Shenzhen College of Advanced Technology University of Chinese Academy of SciencesShenzhen 518055China Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory of Human–Machine Intelligence-Synergy Systems Shenzhen 518055China SIASUN Robot and Automation CO. LtdShenyang 110169China

Terrain classification and force assistance strategies in complex environments have always piqued the interest of many *** wearable soft exosuits,inaccurate terrain recognition can easily introduce undesired assist forces that can easily injure the *** of these problems,we introduced a depth camera into the exosuit system,perform classification of terrain based on a Vision Transformer(ViT),and optimized the control algorithm,which is known as a ViT-Based Terrain Recognition System(TTRS).First,we used the Transformer algorithm to achieve a considerable classification effect in terrain *** also introduced terrain recognition as prior knowledge into the force assistance strategy of the exosuit,providing different force assistance to the exosuit in different ***,we performed human experiments with seven able-bodied people(six males and one female).The promising results demonstrate that our classification accuracy can reach 99.2%under six different terrains and that it can smoothly switch the force–assist curve in different terrains to better adapt to the complex terrain and improve the walking *** aforementioned terrain recognition algorithms and force–assist strategies may positively influence the study of soft exosuit,powered prostheses,and orthotics.

关键词： Vision Transformer(ViT) Depth camera Wearable soft exosuit Force assistance strategy Terrain recognition

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Electron-Exciton Coupling in 1T-TiSe_(2)Bilayer

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Chinese Physics Letters 2023年第5期40卷 59-65页

作者：朱立赵伟民贾振宇李慧平谢学栋李启远汪琪玮窦立国胡聚罡张翼朱文光于顺利李建新李绍春 National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing 210093China International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at the Microscaleand Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Strongly Coupled Quantum Matter Physics of Chinese Academy of Sciences School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing UniversityNanjing 210093China

Excitons in solid state are bosons generated by electron-hole pairs as the Coulomb screening is sufficiently *** exciton condensation can result in exotic physics such as super-fluidity and insulating *** charge density wave(CDW)state,1T-TiSe_(2) is one of the candidates that may host the exciton ***,to envision its excitonic effect is still challenging,particularly at the two-dimensional limit,which is applicable to future ***,we realize the epitaxial 1T-TiSe_(2) bilayer,the two-dimensional limit for its 2×2×2 CDW order,to explore the exciton-associated *** means of high-resolution scanning tunneling spectroscopy and quasiparticle interference,we discover an unexpected state residing below the conduction band and right within the CDW gap *** corroborated by our theoretical analysis,this mysterious phenomenon is in good agreement with the electron-exciton *** study provides a material platform to explore exciton-based electronics and opto-electronics.

关键词： effect limit Electron

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Thermal-sensitive ionogel with NIR-light controlled adhesion for ultrasoft strain sensor

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Nano Research 2023年第4期16卷 5464-5472页

作者： Bing Lei Longxue Cao Xinyu Qu Yunlong Liu Jinjun Shao Qian Wang Shuhong Li Wenjun Wang Xiaochen Dong School of Physical Science and Information Technology Liaocheng UniversityLiaocheng 252059China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) School of Physical and Mathematical SciencesNanjing Tech University(NanjingTech)Nanjing 211816China School of Chemistry&Materials Science Jiangsu Normal UniversityXuzhou 221116China

With the widespread prevailing of flexible electronics in human-machine interfaces,health monitor,and human motion detection,ultrasoft flexible sensors are urgently desired with critical demands in ***,a temperature-sensitive ionogel with near-infrared(NIR)-light controlled adhesion is prepared by electrostatic interaction of poly(diallyl dimethylammonium chloride)(PDDA)and acrylic acid,as well as the incorporation of the conductive polydopamine modified polypyrrole nanoparticles(PPy-PDA NPs).The PPy-PDA NPs could weaken the tough interaction between polymer chains and depress the Young’s modulus of the ionogel,thus promoting the ionogel ultrasoft(34 kPa)and highly stretchable(1,013%)performance to tensile *** addition,the high photothermal conversion capacity of PPy-PDA NPs ensured the ionogel excellent NIR-light controlled adhesion and temperature sensitivity,which facilitated the ionogel on-demand removal and promised a reliable thermal ***,the resulted ultrasoft flexible sensor exhibited high sensitivity and stability to both strain and pressure in a broad range of deformations,enabling a precise monitoring on various human motions and physiological *** temperature-sensitive,ultrasoft,and controlled adhesive capabilities prompted great potential of the flexible ionogel in medical diagnosis and wearable electronics.

关键词： ultrasoft temperature-sensitive controllable adhesion photothermal effect flexible sensor

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Temperature-and field angular-dependent helical spin period characterized by magnetic dynamics in a chiral helimagnet MnNb_(3)S_(6)

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 171-177页

作者： Liyuan Li Haotian Li Kaiyuan Zhou Yaoyu Gu Qingwei Fu Lina Chen Lei Zhang Ronghua Liu National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China New Energy Technology Engineering Laboratory of Jiangsu Province&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application ***,we study the magnetic dynamics of several spin configurations on the monoaxial chiral magnetic crystal MnNb_(3)S_(6)via broadband ferromagnetic resonance(FMR)technique at cryogenic *** the high-field forced ferromagnetic state(FFM)regime,the obtained frequency f *** field H_(res) dispersion curve follows the wellknown Kittel formula for a single FFM,while in the low-field chiral magnetic soliton lattice(CSL)regime,the dependence of H_(res) on magnetic field angle can be well-described by our modified Kittel formula including the mixture of a helical spin segment and the FFM ***,compared with the sophisticated Lorentz micrograph technique,the observed magnetic dynamics corresponding to different spin configurations allow us to obtain temperature-and field-dependent proportion of helical spin texture and helical spin period ratio L(H)/L(0)via our modified Kittel *** results demonstrated that fieldand temperature-dependent nontrivial magnetic structures and corresponding distinct spin dynamics in chiral magnets can be an alternative and efficient approach to uncovering and controlling nontrivial topological magnetic dynamics.

关键词： chiral helimagnets magnetic solitons ferromagnetic resonance phase diagram

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A near-infrared multifunctional fluorescent probe for hypoxia monitoring and tumor-targeted therapy

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Chinese Chemical Letters 2022年第3期33卷 1589-1594页

作者： Yuxun Lu Jiajia Xu Zongyun Jia Siyu Kong Yimu Qiao Lin Li Qiong Wu Ying Zhou College of Chemical Science and Technology Yunnan UniversityKunming 650091China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University(NanjingTech)Nanjing 211816China

Hypoxia is one of the key characteristics of solid tumors. The over-expression of azoreductase resulting from hypoxia can be used as a target to visualize hypoxic levels and a trigger of the drug release system in tumor treatment. In this work, we developed a near-infrared fluorescent probe YLOD, composed of a near-infrared fluorophore, an azo bond, and an analogue of the anti-tumor drug melphalan. In the presence of azoreductase, YLOD displayed a red emission at 620 nm and released the anti-tumor drug concomitantly, thus achieving the integrated effects of hypoxic imaging and tumor treatment. Furthermore, YLOD successfully inhibited the growth of solid tumors during the tumor suppression experiments in nude mice. Considering all the results, YLOD emerges as a new fluorescence tool that can quickly determine the location and the edges of a tumor, showing concrete potential in clinical cancer treatment.

关键词： Azoreductase Hypoxia Theranostic Tumor

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CE-CGAN: Classification Enhanced Conditional Generative Adversarial Networks for Bearing Fault Diagnosis 12

CE-CGAN: Classification Enhanced Conditional Generative Adve...

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12th International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering, QR2MSE 2022

作者： Qi, Yang Su, Lei Gu, Jiefei Li, Ke Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology School of Mechanical Engineering Jiangnan University Wuxi China

ISBN: (纸本)9781839538360

Due to the limitations of actual working conditions and data acquisition equipment, the collected mechanical fault datasets are actually limited and class unbalanced, which limits the accuracy and stability of rolling bearing fault diagnosis. In this paper, we propose a classification-enhanced conditional generative adversarial network (CE-CGAN) to improve the quality of generated data and more importantly, to improve the accuracy of the diagnosis in the small samples and data imbalanced condition. The conditional generative adversarial network (CGAN) is used as the backbone. Aiming at the problem of inaccurate generation of data categories, the label embedding network of the generator is redesigned. The hinge loss is introduced to optimize network loss to improve the stability of this model. The new classification network is added to the model to improve fault diagnosis accuracy, which can collaborate with the generator to improve the quality of generated samples. The experiments show that our method can deal with the bearing fault diagnosis problem in the small samples case more effectively. The model could also improve the accuracy of classification and show better fault diagnosis performance in the case of class imbalance. © 2022 IEEE.

关键词： Failure analysis

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Person Following with Dynamic Obstacle Avoidance

Person Following with Dynamic Obstacle Avoidance

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Kong, Lingxin Jiang, Guolai Tang, Yifeng Ou, Yongsheng Xu, Sheng China Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9798350327182

Person following is essential for many human-robot interaction applications. However, many existing person-following methods do not consider obstacles that have a serious impact on the person-following. In this paper, we focus on the obstacle avoidance problem in the person-following process and propose a dynamic obstacle avoidance path planning method. Our method integrated trajectory prediction into global and local planning to follow a person and avoid obstacles. The proposed method is applied to a practical robot person-following task as an experiment. The experimental results show that the proposed method can achieve the target person following robustly in the case of obstacles. © 2023 IEEE.

关键词： Human robot interaction

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Zonotope-based fault estimation for Lipschitz nonlinear systems 3

Zonotope-based fault estimation for Lipschitz nonlinear syst...

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2024 3rd International Conference on Aerospace and Control Engineering, ICoACE 2024

作者： Ma, Siyuan Zhang, Wei Jiang, Qiang Gao, Sheng School of Automatic and Electrical Engineering Shenyang Ligong University Shenyang110158 China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China China-Portugal Belt and Road Joint Laboratory on Space & Sea Technology Advanced Research Shanghai200120 China

An estimation of fault intervals using a T-N-L structured observer is suggested for Lipschitz nonlinear systems. By augmenting state vectors, the augmentation system and its observer are established, enabling the observer to concurrently estimate fault and system states. The L∞ performance is applied to enhance the resilience of the fault interval estimation to external disturbances and unanticipated inputs. An adequate requirement for the observer design is also presented. The interval estimation of states and faults is ultimately created by using a zonotope. The proposed method exhibits advantages and feasibility when compared to existing simulation techniques. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Nonlinear systems

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