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Additive manufacturing of high-quality tritium breeding pebbles using ceramic precursors

Journal of the European Ceramic Society 2024年第7期44卷 4719-4730页

作者： Su, Fang Li, Yuzeng Xing, Huanhuan Liu, Yu Liu, Zhiyuan Liu, Changyong Jiang, Cho-Pei Chen, Zhangwei Additive Manufacturing Institute Shenzhen University Shenzhen518060 China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robotics Shenzhen University Shenzhen518060 China College of Mechanical & Electrical Engineering National Taipei University of Technology Taipei10608 Taiwan State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an710049 China

In this study, the fabrication of advanced lithium orthosilicate (Li4SiO4) ceramic tritium breeding pebbles through photopolymerization using ceramic precursors (i.e., SiO2 and Li2CO3) is reported for the first time. The pebbles exhibit excellent mechanical and physical properties. Through optimization of manufacturing parameters and a geometrical correction model to compensate printing deviations, the printing accuracy of the pebbles was enhanced. The resulting pebbles had a diameter of approximately 1 mm, a sphericity of 1.01, a uniformly distributed pore structure, a phase purity > 95%, and a satisfying relative density reaching 91.39%. The average crush load 25.7 ± 0.3 N, surpassed that achieved by previously reported methods. Furthermore, the thermal conductivity was enhanced compared to that of solid-phase synthesized Li4SiO4 powder, facilitating the tritium release process for fusion applications. This study may serve as a guidance for designing appropriate ceramic breeders, providing a cost-effective approach applicable to produce other high-precision ceramic components with complex compositions. © 2024 Elsevier Ltd

关键词： Lithium compounds

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Event-triggered H_(∞) PI state estimation for delayed switched neural networks

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Journal of Automation and Intelligence 2024年第1期3卷 26-33页

作者： Yuzhong Wang Changyun Wen Xiaolei Li Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore School of Electrical Engineering Yanshan UniversityQinhuangdao066004China

On state estimation problems of switched neural networks,most existing results with an event-triggered scheme(ETS)not only ignore the estimator information,but also just employ a fixed triggering threshold,and the estimation error cannot be guaranteed to converge to *** addition,the state estimator of non-switched neural networks with integral and exponentially convergent terms cannot be used to improve the estimation performance of switched neural networks due to the difficulties caused by the nonsmoothness of the considered Lyapunov function at the switching *** this paper,we aim at overcoming such difficulties and filling in the gaps,by proposing a novel adaptive ETS(AETS)to design an event-based H_(∞)switched proportional-integral(PI)state estimator.A triggering-dependent exponential convergence term and an integral term are introduced into the switched PI state *** relationship among the average dwell time,the AETS and the PI state estimator are established by the triggering-dependent exponential convergence term such that estimation error asymptotically converges to zero with H_(∞)performance *** is shown that the convergence rate of the resultant error system can be adaptively adjusted according to triggering ***,the validity of the proposed theoretical results is verified through two illustrative examples.

关键词： Switched neural networks H_(∞)performance PI state estimation Event-triggered scheme

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Flapping-Wing Robot Achieves Multi-Domain Locomotion Using Transformable Wheel Mechanism

Flapping-Wing Robot Achieves Multi-Domain Locomotion Using T...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Chai, Xiangxiao Wang, Shihua Pan, Erzhen Xu, Wenfu Shenzhen518055 China Key University Laboratory of Mechanism & Machine Theory and Intelligent Unmanned Systems of Guangdong Shenzhen518055 China Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin150001 China

ISBN: (纸本)9781665481090

The difficulty of moving from aquatic to aerial environment is one of the major challenges limiting the development of trans-medium multi-domain locomotion vehicles. In this paper, the concept of the transformable wheel, a feature commonly found in autonomous land vehicles (AL V s), is introduced into the design. Additionally, a flapping-wing robot equipped with multi-domain locomotion capability, which can not only realize aerial flight and surface navigation on water, but also ascend from water to land for subsequent takeoff is presented. The paper first introduces the system design of the robot and proposes the corresponding multi-domain locomotion strategy. Subsequently, the design of the transformable wheel mechanism is described in detail and the force analysis for the water-exit is conducted. The feasibility of the proposed strategy is experimentally validated, confirming the prototype's multi-domain locomotion performance finally. This research explores the feasibility of introducing the transformable wheel mechanism into trans-medium multi-domain vehicle platforms and provides a design example. © 2024 IEEE.

关键词： Machine design

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Study on the Active Movement Capsule Robot for Biopsy 17

Study on the Active Movement Capsule Robot for Biopsy

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17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Guo, Shuxiang Huang, Fang Guo, Jian Fu, Qiang Tianjin University of Technology Tianjin Key Laboratory for Control Theory Application in Complicated Systems Intelligent Robot Laboratory Binshui Xidao Extention 391 Tianjin China

ISBN: (纸本)9781728164151

In this paper, a novel biopsy robot is proposed. In order to solve the problem of the single function of the commercial capsule endoscope, this paper proposes a novel biopsy capsule robot driven by an external magnetic field. The module includes two radial magnetized magnetic rings and a biopsy mechanism. Without considering the addition energy consumption, using the coupling effect of the three-axis Helmholtz coil and the robot's built-in magnet, the crank slider mechanism converts the torque acting on the magnet by a uniform rotating magnetic field into the cutting force during biopsy. The magnetic switch used to control the switching between the motion function of the anchor biopsy robot and the anchor biopsy function. Finally, the functional modules in the pipeline of anchored biopsy robot is verified by experiments. The results show that the biopsy robot can realize the robot's anchoring in the intestine while performing the biopsy function. The realization of the biopsy capsule robot has important medical diagnostic significance. © 2020 IEEE.

关键词： Biopsy

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Design of a Mesh Crawling Robot with Beetle-Inspired Variable Stiffness Tarsus

Design of a Mesh Crawling Robot with Beetle-Inspired Variabl...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Chen, Hao Hu, Kai Hu, Longlong Zhou, Ziqi Li, Yao Li, Bing Key University Laboratory of Mechanism & Machine Theory and Intelligent Unmanned Systems of Guangdong Guangdong Provincial Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics Shenzhen518055 China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781665481090

Compared with large robots, micro-robots have the advantages of small size, low power consumption, and high concealment. For complex terrain, the crawling performance of micro-robots will be significantly reduced. In this study, the mesh surface was used as the crawling base of the robot, and a variable stiffness tarsus was designed with the beetle as a reference. This tarsus composed of multiple bending parts achieves a large range of stiffness changes, 0.070.495 N/mm. We have achieved stiffness control of the tarsus in a single actuation by trajectory planning of the claw ends. The proposed robot can achieve a big stiffness of the tarsus to resist the deformation of the tarsus due to external forces, which means that the robot can increase the adhesion ability when crawling at the stance phase. Therefore, even when the load was increased from 10g to 40g, the average crawling speed of the robot was not significantly reduced. This new tarsus can improve the crawling performance of the micro-robot on the mesh. © 2024 IEEE.

关键词： Microrobots

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Multiple Jumping and Perching of a Miniature Mobile Robot

Multiple Jumping and Perching of a Miniature Mobile Robot

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Hu, Longlong Tang, Lingqi Chen, Hao Li, Yao Li, Bing Guangdong Provincial Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics Shenzhen518055 China Machine Theory and Intelligent Unmanned Systems of Guangdong Key University Laboratory of Mechanism Shenzhen518055 China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781665481090

Many insects and miniature robots can traverse through narrow spaces via jumping motion;however, successful jumping and landing remains challenging in small-scale. No jumping robot within 90 g have yet demonstrated multiple jumping and perching successfully. Here, we demonstrate continuous jumping and perching of a miniature robot. The origami-inspired structure was manufactured by smart composite microstructure technology. A novel jumping mechanism was designed to load adjustable jump energy actuated by only one motor. A perching mechanism with two adhesive pads was designed to passively couple with the jumping mechanism, achieving perching on the ground and automatically detaching before the next jump. The jumping mechanism achieved adjustable jumping energy, corresponding to jumping height from 0.7 cm to 36.4 cm. The perching mechanism provided successful landing within a wide range (when velocity angle according to vertical direction =18, the velocity magnitude 3.4m/s, the body angle 30). Unlike typical jumping robots performing uncontrollable landing and free-rolling, our robot kept its body up-righted during the whole movement and avoided free-rolling after landing. The self-contained prototype had 18 g of mass, 6.5 cm of body height, and 36.4 cm of maximum jumping height. Finally, an eccentric motor was integrated to perform multiple omnidirectional jumping and perching movements;this represents significant improvement of motion ability for small-scale mobile robots. © 2024 IEEE.

关键词： Landing

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Linear active disturbance rejection control of phase-shifted full-bridge converter based on improved particle swarm optimization algorithm 20

Linear active disturbance rejection control of phase-shifted...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Wang, HongSen Wu, YanJuan Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Binshui Xidao 391 Tianjin China

ISBN: (纸本)9798350320831

In order to improve the dynamic performance and disturbance suppression ability of conventional PID control phase shift full-bridge converter, LADRC based on improved particle swarm optimization is proposed. The voltage loop transfer function of phase-shifted full-bridge converter is derived based on the state space average method. Secondly, LESO and LSEF are designed to estimate and compensate the external disturbance and internal uncertainty in real time. Finally, the advantages of linear active disturbance rejection controller are verified by simulation experiments. The experimental results show that the controller has better disturbance suppression performance and dynamic performance than the traditional PID controller. © 2023 IEEE.

关键词： controllers

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Based on Hybrid Densenet-121 with Support Vector Machine Algorithm for Lettuce and Chili 20

Based on Hybrid Densenet-121 with Support Vector Machine Alg...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： He, Yuzhe Wu, Yanjuan Wang, Caiwei Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Binshui Xidao 391 Tianjin China

ISBN: (纸本)9798350320831

In this paper, to improve the recognition accuracy of Densenet-121, we combine Densenet-121 with SVM to generate a new network Densenet-121-SVM. In this paper, the two datasets are combined to generate a new dataset named Mixed-dataset, which has four plants, namely: Lettuce, Chili, Chinee apple, and Lantana, and this dataset is used to train the network. Finally, the recognition accuracies of SVM, Densenet121 and Densenet-121-SVM are 84.144%, 96.211% and 98.181%, respectively, and it can be seen that the accuracy of Densenet-121-SVM is improved by 14% and 1.97% compared to SVM and Densenet-121, respectively. © 2023 IEEE.

关键词： Lettuce

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Uncertainty Treatment of Integrated Energy System Based on Scenario Reduction Method 20

Uncertainty Treatment of Integrated Energy System Based on S...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Wang, Caiwei Wu, Yanjuan Cong, Peizhi He, Yuzhe Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Binshui Xidao 391 Tianjin China

ISBN: (纸本)9798350320831

In the context of high permeability of renewable energy, a large number of uncertain energy sources, such as scenery, have brought a huge impact on the security and stability of the comprehensive energy system. In order to reduce the impact of renewable energy on the new power system and improve the system stability, In this paper, a comprehensive energy system of the park is set up, which consists of three kinds of energy loads including source side electricity, heat, gas and scenery, and electric heat. On this basis, Monte Carlo method is adopted to simulate multiple sets of scenes respectively for the scenery output. On this basis, scene reduction method is adopted to reduce them to obtain the final equivalent force diagram, so as to reduce the influence of the uncertainty of scenery on the system stability. Finally, the effectiveness of the proposed method is verified by simulation analysis. © 2023 IEEE.

关键词： Monte Carlo methods

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Real-time scheduling strategy for electric vehicles based on sliding window transmission optimization 20

Real-time scheduling strategy for electric vehicles based on...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Cong, Peizhi Wu, Yanjuan Wang, Caiwei Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Binshui Xidao 391 Tianjin China

ISBN: (纸本)9798350320831

In order to reduce the impact of electric vehicle(EV) charging load on the power grid, a real-time optimal scheduling scheme for charging and discharging Evs is proposed. Firstly, the objective is to reduce charging costs and network loss costs, aiming to minimize the total cost of EVs at the current time. An EV dispatching model is established, the grid node acceptance capacity performance is analyzed by constructing a network loss sensitivity index, and the EV charging and discharging strategy is obtained in real time based on the time-of-use tariff of the grid load by means of a tide calculation and a sliding window variable speed optimization algorithm as well as a second-order convex optimization calculation method. Finally, the proposed strategy is verified to be effective in reducing the charging cost and network loss cost, and has good real-time flexible dispatching performance, using an improved IEEE 39-node distribution network as an example. © 2023 IEEE.

关键词： Electric vehicles

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