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3rd International Conference on Computer technology, Information Engineering, and Electron Materials, CTIEEM 2023

作者： Hu, Shujun Li, Shibo Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510672925

Lightweight composites with flexibility and ideal electromagnetic interference (EMI) shielding performance are required for protecting electronic devices against electromagnetic wave pollution. Herein, binary flexible and conductive polyvinyl alcohol (PVA)/Ti3C2Tx composite film with a "brick-and-mortar"structure was prepared using a vacuum filtration self-assembly strategy. By the combination of PVA and Ti3C2Tx, the PVA/Ti3C2Tx composite films have been successfully obtained, leading to high electrical conductivity (≥12.3 S/cm) and superior EMI shielding efficiency (≥27 dB, 8.2-12.4 GHz). The preparation of PVA/Ti3C2Tx film offers a promising approach for designing and fabricating flexible high-performance MXene-based EMI shielding materials, which may be applied in various applications including flexible wearable electronic devices and portable equipment. © 2024 SPIE.

关键词： Electromagnetic pulse

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Microstructure and mechanical properties of as-cast(CuNi)100-xCox medium-entropy alloys

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China Foundry 2022年第6期19卷 511-518页

作者： Zhi-yong Yang Wei-ping Chen Liang-yan Hao Chen-liang Chu Da-hai Zeng Wei Xiong Zhi-qiang Fu Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou 510640China Physical Metallurgy and Materials Design Laboratory Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPittsburghPA15261USA National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China

Microstructure and mechanical properties of non-equiatomic(CuNi)_(100-x)Co_(x)(x=15,20,25 and 30,at.%)medium-entropy alloys(MEAs)prepared by vacuum arc-melting were *** show that all the as-cast MEAs exhibit dual face-centered cubic(fcc)solid-solution phases with identical lattice constant,showing typical dendrite structure consisting of(Ni,Co)-rich phase in dendrites and Cu-rich phase in *** positive enthalpy of mixing among Cu and Ni-Co elements is responsible for the segregation of *** the increase of Co content,the volume fraction of(Ni,Co)-rich phase increases while the Cu-rich phase decreases,resulting in an increment of yield strength and a decrement of elongation for the(CuNi)_(100-x)Co_(x) ***-indentation test results show a great difference of microhardness between the two fcc phases of the *** measured microhardness value of the(Ni,Co)-rich phase is almost twofold as compared to that of the Cu-rich phase in all the(CuNi)_(100-x)Co_(x) *** the deformation of the MEAs,the Cu-rich phase bears the main plastic strain,whereas the(Ni,Co)-rich phase provides more pronounced strengthening.

关键词： medium-entropy alloys microstructure mechanical properties nano-indentation

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Accelerated design for magnetocaloric performance in Mn-Fe-P-Si compounds using machine learning

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Journal of Materials Science & technology 2022年第1期96卷 241-247页

作者： Defang Tu Jianqi Yan Yunbo Xie Jun Li Shuo Feng Mingxu Xia Jianguo Li Alex Po Leung School of Material Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Macao University of Science and Technology MacaoChina Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai 200240China School of Engineering University of LeicesterLeicester LE17RHUnited Kingdom

Magnetocaloric performance is of vital importance for Mn-Fe-P-Si ***,when processes and compositions are considered,designing alloys with large magnetic entropy changes(ΔS_(m)),low thermal hysteresis(ΔT_(hys)),and Curie temperatures(T_(C))around room temperature become relatively *** this study,we adopt machine learning methods to predict the magnetocaloric performance of Mn-Fe-P-Si compounds for the first *** achieve this goal,503,465,and 660 data points for datasets with T_(C),ΔT_(hys),andΔS_(m)are collected,*** collected datasets contain parameters of compositions,preparations,heat treatment,and magnetic field *** search for the optimal configuration using various methods and also compare their mean squared errors(MSE)and allowable *** results show that the performance of neural networks(NNs)is better than other ***,we select NN to explore the T_(C),ΔT_(hys),andΔS_(m)values as a function of Mn,Si,metal/non-metal ratios,and B(Boron).We also propose to use the composition window with excellent magnetocaloric *** results not only help us gain deep insights into Mn-Fe-P-Si alloys but also accelerate the design process of alloys suitable for magnetocaloric *** work has the potential to solve the challenges and boost the research of Mn-Fe-P-Si alloys.

关键词： Mn-Fe-P-Si alloy Material design Magnetocaloric performance Machine learning Neural network

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Output Feedback Control of Hydraulic Driven Flexible Actuator with Imprecise Modeling

Output Feedback Control of Hydraulic Driven Flexible Actuato...

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第43届中国控制会议

作者： Huidong Hou Jinsong Zhao Yi Liu Xianwei Niu Yunpeng Zhang School of Mechanical Engineering Yanshan University State Key Laboratory of Crane Technology Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

In recent years,flexible soft robots have received increasing attention compared to rigid robots. The modeling of flexible actuators has always been difficult to solve. The control problem of hydraulic driven flexible actuators in this paper under the premise of imprecise modeling. In this paper,an innovative output feedback controller based on Unknown System Dynamics Estimator(USDE) is proposed to improve the position tracking accuracy of hydraulic driven flexible actuators with imprecise model. Firstly,the strict feedback high order electro-hydraulic servo system is transformed into a new standard form that incorporates servo valve dynamics. Therefore,controllers designed using traditional backstepping methods are rendered obsolete. Subsequently,a High-Gain Observer(HGO) is introduced for state reconstruction of the new system. To counteract the impact of lumped unknown system dynamics which include imprecise modeling dynamics of hydraulic driven flexible actuator,a USDE with straightforward parameter tuning and robust performance is introduced. Finally,both scalar containing error terms and USDE are integrated into the design of the output feedback controller. Experimental validation is conducted to demonstrate the effectiveness of the proposed method.

关键词： Electro-hydraulic servo system Flexible actuator Imprecise model estimation Output feedback control

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Preparation and regulation of electromagnetic parameters of Ti3C2Tx@Ni composite powders 2

Preparation and regulation of electromagnetic parameters of ...

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2024 2nd International Conference on Materials Science and Intelligent Manufacturing, MSIM 2024

作者： Hu, Shujun Li, Shibo Pan, Peng Ge, Feng Yang, Ming Yu, Jinxi Wang, Jinnan Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

Novel electromagnetic (EM) materials with adjustable EM properties are anticipated to fulfill the requirements of electronic communication, national defense, and aerospace fields. In this study, functional Ti3C2Tx@Ni composite powders with adjustable Ni content were successfully prepared using a facile electroless plating strategy. The EM parameters can be regulated by controlling the Ni content in Ti3C2Tx@Ni composite powders. As the Ni content increases, the values of real and imaginary parts of the complex permittivity of the Ti3C2Tx@yNi/wax (y = 10 ∼ 80) in the 2-18 GHz show a trend of initially decreasing and then increasing. The real and imaginary parts of the complex permeability of Ti3C2Tx@yNi/wax range from 0.95 to 1.03 and -0.10 to 0.07, respectively. After introducing magnetic Ni, Ti3C2Tx exhibits dielectric and magnetic losses on EM waves, with dielectric losses having a greater dissipation on the EM waves. © Published under licence by IOP Publishing Ltd.

关键词： Dielectric losses

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A novel architecture of electro-hydrostatic actuator with digital distribution

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Chinese Journal of Aeronautics 2021年第5期34卷 224-238页

作者： Jing YAO Pei WANG Zhaosheng DONG Dongting JIANG Tong SHA School of Mechanical Engineering Yanshan UniversityQinhuangdcio 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China Ycmshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Ycmshan UniversityQinhuangdao 066004China

To address the flow imbalance rapidly of the asymmetric Electro-Hydrostatic Actuator(EHA),this paper presents a novel architecture of asymmetric EHA with the Digital Distribution(EHA-DD).It also improves the flow nonlinearity and control accuracy of the pump,especially in the low-speed *** digital distribution with two High-Speed on–off Valves(HSVs)not only balances flow instead of the check valves,but also replaces the pump at the low-speed to control output flow by adjusting the PWM *** pump and HSVs are the crucial components to control flow ***,the flow calculation models of the pump and the duty ratio inversed model of the HSV are obtained through experimental tests and the identification *** get the control input signal for the required flow,the pump speed and PWM duty ratio for the HSVs are inversed to compensate for flow ***,a multimode digital flow distribution control method based on pump speed,mainly including the pump-controlled mode for large flow demand and valve-controlled mode for little flow demand,is proposed to control the accurate flow output *** step extension experiments based on the flow calculation models are conducted on the EHA-DD prototype under elastic,opposite varying *** results demonstrate that the EHADD realizes little position error by accurate flow control,and it is also beneficial to improve the service life of the pump.

关键词： Asymmetrical flow Digital distribution EHA High-speed on–off valve Nonlinearity PWM control

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Effect of Strontium Modification on Microstructure and Mechanical Property Al12SiCuMgNi Alloy in Squeeze Casting 7

Effect of Strontium Modification on Microstructure and Mecha...

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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Ji, Kaiwen Li, Longfei Liang, Junning Li, Chunming Zhao, Xuesheng Han, Qinghua Chen, Lin Zuo, Lingli Zhang, Yang China Academy of Machinery Science and Technology Beijing100044 China Beijing National Innovation Institute of Lightweight Ltd. Beijing100083 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science & Technology Group Beijing100083 China Hebei Fengwei Machinery Co. Ltd. Hebei Xingtai154500 China

The Al-Si series alloys, which have excellent fluidity and castability, are the most common aluminum material in the casting industry. However, the coarse eutectic Si phase with laminar morphology leads to the stress concentration of material and has a detrimental effect on the mechanical properties of aluminum alloy components. In this study, the Strontium (Sr) modifier was added to Al12SiCuMgNi alloy and the effect of Sr on microstructure and performance of Al12SiCuMgNi in squeeze casting was investigated. The experimental results show that the eutectic Si phase was well modified to fibrous morphology. Although the yield strength (YS) was leveled, the ultimate tensile strength (UTS) and elongation (EL) of the alloy were obviously enhanced after Sr addition. When the 0.012wt.% Sr was added to Al12SiCuMgNi alloy. The YS, UTS, and EL of alloys were up to 311 MPa, 401 MPa, and 3.4%, respectively. Moreover, the microstructure and performance of Al12SiCuMgNi alloy in the hot forging process were also compared to Al12SiCuMgNi alloy with and without Sr addition in squeeze casting. It is concluded that the Al12SiCuMgNi alloy in hot forging shows higher ductility (4.7%) and lower strength than Al12SiCuMgNi alloy in squeeze casting. © Published under licence by IOP Publishing Ltd.

关键词： Tensile strength

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Research on the Process-based Generation Method of Scenarios Database for Maritime Autonomous Surface Ship Test 7

Research on the Process-based Generation Method of Scenarios...

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2022 7th International Conference on Electronic technology and Information Science, ICETIS 2022

作者： Wang, Xinyu Wang, Yihang Ma, Jilin Bian, Hui Zhao, Xuan Lan, Yaoyao Qinhuangdao Branch China Classification Society Hebei Qinhuangdao China School of Mechanical Engineering Yanshan University Hebei Qinhuangdao China Science and Technology Innovation and Test Center China Classification Society Beijing China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China

ISBN: (纸本)9783800757794

In recent years, Maritime Autonomous Surface Ship (MASS) has been developed rapidly and has demonstrated many new capabilities, which poses a challenge to the testing methods of autonomous ships. Currently, traditional test methods is no longer sufficient to support comprehensive testing and verification. For virtual testing, there is still a lack of a reliable virtual test scenario generation process. Therefore, this paper proposes a method for generating virtual test scenarios for autonomous ships. It is based on the scenario generation frame of the intelligent car and comprehensively considers the feature of the operating environment of the MASS. This process develops an element database by deconstructing the real scenes. For generating, it reconstructs and assigns the elements according to the test task (functional scenario) and the logical relationship between the elements (logical scenario) to reconstruct the new scenario. The new scenarios obtained in this way are optimized and supplemented to be the test scenarios database. In addition, a prototype following this frame was designed and loaded with the "automatic pathfinding task of the Wuhan section of the Yangtze River under good navigation conditions" for testing. The experiment generated 48 different scenarios, proving that this generator can output a comprehensive test scenario database to meet test requirements. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Database systems

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forming Parameter Optimization based on Kriging Model and Genetic Algorithm 7

Forming Parameter Optimization based on Kriging Model and Ge...

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7th IEEE Information technology and Mechatronics Engineering Conference, ITOEC 2023

作者： Tang, Junxiong You, Dongdong Li, Fenglei Cheng, Yong National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong China Guangdong Key Laboratory for Advanced Metallic Materials Processing Guangdong China Beijing Qingtai Data Technology Co. Ltd. Beijing China

ISBN: (纸本)9798350334197

When optimizing the processing parameters for hydraulic forming of sheet metal, improving the process parameters based on actual experiments will increase costs, while finite element simulation will lengthen the design cycle. This study proposes a feasible solution by using a Kriging predictive surrogate model to replace the time-consuming finite element model and combining it with multi-objective genetic algorithm for parameter optimization. The optimal process parameters obtained from the simulation validation of finite element analysis prove the feasibility of this solution. This integrated approach of using machine learning and optimization algorithms is practical and promising for improving efficiency and reducing costs in the manufacturing industry. © 2023 IEEE.

关键词： Genetic algorithms

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Microstructure evolution and mechanical properties of a novelγ’phase-strengthened Ir-W-Al-Th superalloy

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Rare Metals 2021年第12期40卷 3588-3597页

作者： Jie-Ren Yang Xiao Fang Yi Liu Zi-Tong Gao Ming Wen Rui Hu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Kunming Institute of Precious MetalsKunming 650106China

The present work introduces a novelγ’phasestrengthened Ir-W-Al-Th superalloy for ultrahigh-temperature ***,the as-cast microstructure and phase transformation of Ir-13 W-6 Al-0.15 Th(at%)alloy during solid solution and aging were *** transformation was observed during heat *** primaryγ’phase disappeared via the redissolution ofγ’→γat 1800℃.The recrystallization took place at 1450℃and very fine equiaxedγ’/γgrains formed after240 *** cold-rolled microstructure indicated that the room-temperature c phase was brittle and cracks mainly emerged along grain ***-13 W-6 Al-0.15 Th alloy exhibited a higher nanohardness than other Ir-based superalloys and pure Ir,which can be attributed to the solid solution and precipitation(γ’)*** addition,the as-cast Ir-13 W-6 Al-0.15 Th alloy shows a medium room-temperature compressive yield strength and good ductility.

关键词： Ir-based alloy Two-phase microstructure Strengthening Aging Mechanical properties

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