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Interfacial Bonding Mechanism and Mechanical Performance of Continuous Fiber Reinforced Composites in Additive Manufacturing

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Chinese Journal of Mechanical Engineering 2021年第1期34卷 131-141页

作者： Congze Fan Zhongde Shan Guisheng Zou Li Zhan Dongdong Yan State Key Laboratory of Advanced Forming Technology and Equipment Beijing 100044China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China nanjing university of aeronautics and astron autics Nanjing 210016China China Academy of Mach inery Science&Technology Group Co. Ltd.Beijing 100044China

The additive manufacturing of continuous fiber composites has the advantage of a high-precision and efficient forming process,which can realize the lightweight and integrated manufacturing of complex ***,many void defects exist between layers in the printing process of additive manufacturing;consequently,the bonding performance between layers is *** bonding neck is considered a key parameter for representing the quality of interfacial *** this study,the formation mechanism of the bonding neck was comprehensively ***,the influence of the nozzle and basement temperatures on the printing performance and bonding neck size was ***,CT scanning was used to realize the quantitative characterization of bonding neck parameters,and the reason behind the deviation of actual measurements from theoretical calculations was *** the nozzle temperature increased from 180 to 220℃,CT measurement showed that the bonding neck diameter increased from 0.29 to 0.34 mm,and the cross-sectional porosity reduced from 5.48%to 3.22%.Finally,the fracture mechanism was studied,and the influence of the interfacial bonding quality on the destruction process of the materials was *** conclusion,this study can assist in optimizing the process parameters,which improves the precision of the printing parts and performance between the layers.

关键词： 3D printing Thermoplastic resin Continuous fiber Additive manufacturing

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Sliding mode fault tolerant consensus control for multi-agent systems based on super-twisting observer

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Journal of Systems Engineering and Electronics 2022年第6期33卷 1309-1319页

作者： YANG Pu HU Xukai WANG Zixin ZHANG Zhiqing College of Automation Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The fault-tolerant consensus problem for leader-following nonlinear multi-agent systems with actuator faults is mainly investigated.A new super-twisting sliding mode observer is constructed to estimate the velocity and undetectable fault information *** time-varying gain is introduced to solve the initial error problem and peak value problem,which makes the observation more accurate and ***,based on the estimated results,an improved sliding mode fault-tolerant consensus control algorithm is designed to compensate the actuator *** protocol can guarantee the finite-time consensus control of multi-agent systems and suppress ***,the effectiveness and the superiority of the observer and control algorithm are proved by some simulation examples of the multi-aircraft system.

关键词： multi-agent system sliding mode control fault-tolerant consensus control super-twisting sliding mode observer

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维普期刊数据库

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Participant attack on the deterministic measurement-device-independent quantum secret sharing protocol

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Science China(Physics,Mechanics & astronomy) 2021年第6期64卷 121-124页

作者： Yu-Guang Yang Yue-Chao Wang Yong-Li Yang Xiu-Bo Chen Dan Li Yi-Hua Zhou Wei-Min Shi Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Key Laboralory of Trusted Computing Beijing 100124China Guangxi Key Laboratory of Crptography and Information Security Guilin 541004China Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing 100876China College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In a recent article[Gao et al.,***.63,120311(2020)],a two-receiver measurement-deviceindependent quantum secret sharing(MDI-QSS)protocol was *** was proven to be secure against eavesdropping and generalized to the multireceiver ***,the participant attack is a fatal threat to QSS ***,we highlight that a dishonest participant can obtain a sender’s secret message alone without introducing any detectable error,evidencing the vulnerability of the MDI-QSS protocol to the participant attack.

关键词： quantum cryptography quantum secret sharing participant attack

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