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4th IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2024

作者： Tian, Zhilong Li, Runmei Xiong, Gang Zhu, Fenghua Beijing Jiaotong University School of Automation and Intelligence Beijing China Chinese Academy of Sciences Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Beijing China Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan China Chinese Academy of Sciences State Key Laboratory for Multimodal Artificial Intelligence Systems Beijing China

ISBN: (纸本)9798350349252

High-speed trains are inevitably affected by emergencies in their daily operation, which may cause the trains to fail to run according to the original planned timetable. Therefore, how to adjust the timetable of subsequent trains in emergencies is crucial for railway operations. This paper introduces a deep reinforcement learning algorithm based on an actor-critic network, which minimizes the total delay time by defining the departure order as an action. Numerical experiments are performed on the timetable of Beijing-Shanghai high-speed railway line. © 2024 IEEE.

关键词： deep reinforcement learning

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Text Semantic Analysis and Intelligent Interaction in Parallel dispatching Systems for Technical Station 4

Text Semantic Analysis and Intelligent Interaction in Parall...

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4th IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2024

作者： Jiao, Yuantao Wang, Jian Li, Runmei Xiong, Gang Chen, Shichao Beijing Jiaotong University School of Automation and Intelligence Beijing China Institute of Automation Chinese Academy of Sciences Beijing Engineering Research Center of Intelligent Systems and Technology Beijing China Cloud Computing Center Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Dongguan China Chinese Academy of Sciences State Key Laboratory for Multimodal Artificial Intelligence Systems Beijing China

ISBN: (纸本)9798350349252

Technical station dispatching system plays an important role in cargo operation, but due to the large number of dispatching systems and complex operation, dispatchers rely on manual experience to complete the task, and many scenarios cannot be applied in the real system. Therefore, this paper utilizes the data-driven form to establish a parallel dispatching system for technical stations, semantically analyzes text data rich in dispatcher experience, completes the Computational Experiments on the textual semantic data in the artificial dispatching system, and synchronizes the Parallel Execution of data interaction with the real dispatching system. © 2024 IEEE.

关键词： parallel intelligence railway dispatching system technical station

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Implementation of Advanced Techniques for Quality Assessment of Metal Parts Produced by SLM technology 2nd

Implementation of Advanced Techniques for Quality Assessment...

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2nd International Conference on From Smart City to Smart Factory for a Sustainable Future, SCFF 2024

作者： Matuš, Miroslav Bechný, Vladimír Šajgalík, Michal Markovič, Jaromír drbúl, Mário Cedzo, Miroslav Joch, Richard Krišák, dominik Faculty of Mechanical Engineering University of Zilina Univerzitná 8215/1 Žilina010 26 Slovakia Department of Machining Assembly and Engineering Technology Faculty of Mechanical Engineering Center of 3D Printing Protolab VSB-TU Ostrava 17. Listopadu 2172/15 Ostrava708 00 Czech Republic

ISBN: (纸本)9783031656552

Over time, additive manufacturing has found a place in almost every sector of industry. This is helped by the fact that it is possible to process an increasing amount of material, especially metals, plastics and composite materials. As with any technology, additive manufacturing includes many advantages and disadvantages, which we are continuously striving to optimize through research and development. In the study, deviations between scanned parts and basic CAd models were evaluated. The individual parts were produced by additive SLM technology, which is a metal-based additive manufacturing technique, and the technology uses the principle of powdered material processing, where deformations occur during the manufacturing process due to the influence of heat on the part. The aim of the present study is the design and implementation of optimization processes based on advanced quality assessment methods using simulations, by scanning models and then comparing the deviations against nominal values of the models. The study identifies individual undesirable phenomena that arise with each technology and seeks to minimize them. These are the deformations produced during the manufacturing process and the deviations from nominal values caused by this. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Additive manufacturing Optimization Simulation SLM

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Exit morphology and mechanical property of FdM printed PLA: influence of hot melt extrusion process

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Advances in Manufacturing 2023年第1期11卷 56-74页

作者： Yan-Hua Bian Gang Yu Xin Zhao Shao-Xia Li Xiu-Li He Chong-Xin Tian Zhi-Yong Li Institute of Mechanics Chinese Academy of SciencesBeijing100190People’s Republic of China School of Engineering Science University of Chinese Academy of SciencesBeijing100049People’s Republic of China Research Institute of 3D Printing Beijing City UniversityBeijing100083People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049People’s Republic of China

In order to study the hot melt extrusion process in fused deposition modeling(FdM),this study mainly explores the effects of printing temperature,heated block length,feeding speed on the exit morphology and mechanical properties of FdM printed Polylactic acid(PLA)***-speed camera is used to capture the exit morphology of molten PLA just extruded to the *** to exit morphology,the outlet states of extruded molten material can be divided into four categories,namely,bubbled state,coherent state,expanding state,and unstable *** test results show that printing temperature,heated block length and printing speed have significant influence on tensile properties and fracture mode of FdM printed *** the heated block length is 15 mm and 30 mm,there is a ductile-brittle transition in fracture mode with the increase of printing *** printing process window under different heated block lengths and printing temperatures has been figured out and the distribution of printing process window under different printing speeds has been *** is a maximum printing process window under the heated block length of 30 *** finding provides a frame work for performance prediction of FdM printed parts and theoretical guidance for expanding the scope of printing process window.

关键词： Fused deposition modeling(FdM) Polylactic acid(PLA) Exit morphology Tensile property printing process window

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Additive Manufacturing technology Lends Wings to Orthopedic Clinical Treatment-The Innovative development of Medical Additive Manufacturing in Shanghai Ninth People’s Hospital

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Additive Manufacturing Frontiers 2024年第4期3卷 44-56页

作者： Wei Yang Shasha Liu Liang deng dinghao Luo Zhaoyang Ran Tinglong Chen Lei Wang Kai Xie Junxiang Wu Wenbo Jiang Ping Liu Jingke Fu Yongqiang Hao Kerong dai Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing TechnologyShanghai200011China The Base of Achievement Transformation Shidong Hospital Affiliated to University of Shanghai for Science and TechnologyShanghai200443China Shanghai Key Laboratory of Orthopaedic Implant Department of Orthopaedic SurgeryShanghai Ninth People’s Hospital Shanghai Jiao Tong University School of MedicineShanghai200011China

3d-printing technology,a leading example of advanced additive manufacturing,has revolutionized the treatment of clinical orthopedic diseases,ushering in a new era of personalized *** the 1980s,the orthopedic team led by *** dai at Shanghai Ninth People’s Hospital,affiliated with Shanghai Jiao Tong University School of Medicine,has effectively advanced the research,development,and implementation of customized artificial joints through medical *** work laid the foundation for the application of domestic 3d-printing in *** innovations-from fundamental research to clinical practice,from metal prosthesis implantation to customized bioactive bone product replacement,and from the traditional standardized diagnostic and treatment paradigm to the transformation of personalized medical models-underscore the pivotal role of 3d-printing *** has promoted personalized medicine,enhanced surgical precision,minimized the risk of infection,and accelerated bone *** Hao’s group has further expanded and deepened the application of three-dimensional printing technology in *** breakthroughs have been achieved in domestic bioactive metals,metal orthopedic implants,and 3d-printed biological *** protocols for personalized internal fixation and novel pelvic reconstruction prostheses are now internationally recognized in clinical *** study provides a comprehensive overview of the innovative research and applications of personalized and customized 3d-printed orthopedic implants.

关键词： Additive manufacturing 3d bioprinting Alloys Implants Personalization Clinical transformation

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Manufacturing Accuracy Improvement of Concrete Product by Hybrid Additive and Subtractive Method Based on the Time-dependent Characteristics of Cementitious Materials

SSRN

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SSRN 2024年

作者： Wang, Li Lin, Wenyu Wan, Qian Li, Zhijian Bai, Gang School of Civil and Transportation Engineering Hebei University of Technology Tianjin300401 China Engineering Research Center on Construction 3D Printing of Hebei Tianjin300401 China

Cementitious materials used in 3d printing exhibit significant time-dependent characteristics in terms of early-age rheology and stiffness development that limit high-quality manufacturing. Meanwhile, the centimeter-level printing accuracy of 3dPC makes it difficult to meet actual engineering requirements. To address the above challenges, this paper develops the hybrid additive and subtractive methods to improve manufacturing accuracy for concrete products. The printed components undergo cutting/grinding subtractive treatment until the actual dimensions match the design dimensions within acceptable tolerances. The processing error of the methods was quantitatively analyzed using 3d laser scanning technology, and the effectiveness was validated through various case studies. The results indicate that manufacturing mismatch can be controlled within a range of 2 mm, and the surface roughness of the components can be reduced from 8.5 mm to 0.5 mm, resulting in a 94.12% increase. The practice proves that the proposed methods can achieve high-precision construction of various free-form structures. © 2024, The Authors. All rights reserved.

关键词： Additives

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Microstructure and mechanical properties of nickel-based superalloy fabricated by laser powder-bed fusion using recycled powders

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 266-278页

作者： de-cheng Kong Chao-fang dong Xiao-qing Ni Liang Zhang Rui-xue Li Xing He Cheng Man Xiao-gang Li Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Evaluating the recyclability of powders in additive manufacturing has been a long-term *** this study,the microstructure and mechanical properties of a nickel-based superalloy fabricated by laser powder-bed fusion(LPBF)using recycled powders were ***-melted powder surfaces,satellite particles,and deformed powders were found in the recycled powders,combined with a high-oxygencontent surface *** increasing oxygen content led to the formation of high-density oxide inclusions;moreover,printing-induced cracks widely occurred and mainly formed along the grain boundaries in the as-built LPBF nickel-based superalloys fabricated using recycled powders.A little change in the Si or Mn content did not increase the hot cracking susceptibility(HCS)of the printed *** changing aspect ratio and the surface damage of the recycled powders might contribute to increasing the crack ***,the configuration of cracks in the as-built parts led to anisotropic mechanical properties,mainly resulting in extremely low ductility vertical to the building direction,and the cracks mainly propagated along the cellular boundary owing to the existence of a brittle precipitation phase.

关键词： laser powder-bed fusion recycled powder cracking anisotropy nickel-based superalloy

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Multimaterial Embedded 3d printing of Composite Reinforced Soft Actuators

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research 2023年第4期2023卷 727-737页

作者： Zhenhua Wang Boyu Zhang Qu He Hao Chen Jizhe Wang Yuan Yao Nanjia Zhou Weicheng Cui Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouZhejiang ProvinceChina Research Center for Industries of the Future and Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceSchool of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina

Soft pneumatic actuators(SPAs)have attracted enormous attention in the growing field of *** different SPAs,composite reinforced actuators(CRAs)are widely used because of their simple structure and high ***,multistep molding,a time-consuming method,is still the predominant fabrication ***,we propose a multimaterial embedded printing method(ME3P)to fabricate *** comparison with other 3-dimensional printing methods,our method improves fabrication flexibility *** the design and fabrication of the reinforced composites’patterns and different geometries of the soft body,we demonstrate actuators with programmable responses(elongation,contraction,twisting,bending,and helical and omnidirectional bending).Finite element analysis is employed for the prediction of pneumatic responses and the inverse design of actuators based on specific actuation ***,we use tube-crawling robots as a model system to demonstrate our ability to fabricate complex soft robots for practical *** work demonstrates the versatility of ME3P for the future manufacturing of CRA-based soft robots.

关键词： composites composite printing

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Spray-based 3d printed foam concrete: Stress concentration relieve utilization

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Construction and Building Materials 2025年 485卷

作者： Sun, Yuhang Wang, Haonan Zhang, Yi Liu, Xiongfei Ma, Guowei Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing100124 China School of Civil and Transportation Engineering Hebei University of Technology Tianjin300401 China Engineering Research Center on Construction 3D Printing of Hebei Tianjin300401 China

This study employs spray-based 3d (S-3d) printed foam concrete to propose a design method for tunnel yielding support, addressing the issue of concentrated stress failure in lining structures under large deformation surrounding rock. The mechanical performance of concrete under concentrated compressive stress is evaluated with varying thicknesses of the S-3d printed foam concrete layer (15, 25, 35, and 45 mm). The yielding protection mechanism of the S-3d printed foam concrete layer is analyzed based on its effects on concrete bearing capacity, failure morphology, and deformation energy absorption. The results demonstrate that S-3d printed foam concrete effectively mitigates concentrated stress. Compared to cast concrete, S-3d printed foam concrete exhibits superior synergy with the foundation structure. At a thickness of 15 mm, the S-3d printed composite structure (S-15) exhibits typical yielding support characteristics, transitioning from single-crack to multi-crack failure modes. Relative to the control group (C-0), the ultimate compressive load, ultimate deformation, and energy absorption capacity of S-15 increase by 31.6 %, 243.5 %, and 331.8 %, respectively. To further assess the capacity of S-3d printed foam concrete to alleviate concentrated stress under more complex stress states, shear tests are conducted on SS-15. Compared to the control group (CS-0), the ultimate load, ultimate deformation, and energy absorption capacity of SS-15 improved by 32.2 %, 135.1 %, and 145.7 %, respectively. The findings confirm that S-3d printed foam concrete effectively reduces the concentrated stress exerted by rock on tunnel lining structures and enhances the long-term support performance. © 2025 Elsevier Ltd

关键词： Stress concentration

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Hand medical monitoring system based on machine learning and optimal EMG feature set

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Personal and Ubiquitous Computing 2023年第6期27卷 1991-2007页

作者： Yu, Mingchao Li, Gongfa Jiang, du Jiang, Guozhang Tao, Bo Chen, disi Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Research Institute Wuhan University of Science and Technology Wuhan430081 China Research Center of Biologic Manipulator and Intelligent Measurement and Control Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China 3D Printing and Intelligent Manufacturing Engineering Institute Wuhan University of Science and Technology Wuhan430081 China School of Computing University of Portsmouth PortsmouthPO1 3HE United Kingdom

Considering that serious hand function damage will greatly affect the daily life of patients, its recovery mainly depends on the regular inspection and manual training of medical staff, and medical monitoring based on bioelectric signals can largely replace manual re-examination as autonomous rehabilitation technology. So, for the rationality of feature selection and the diversity of classifier design in the gesture recognition process based on electromyography (EMG) signals, this paper proposes a hand medical monitoring system based on feature selection method of feature subset average recognition rate and optimal machine learning algorithm selection, which mainly depends on the prediction of hand movement. At the same time, since most experiments are conducted in different non-public proprietary databases, the comparison between various gesture recognition methods can only be analyzed to a certain extent. Therefore, this paper uses the dB1 dataset in the large publicly available NinaPro database and combines with presently well-known 11 time-domain (Td) features and 5 frequency domain (Fd) features, then uses the support vector machine (SVM) classifier to comparative analysis total 136 feature combinations under various feature numbers. Under the premise of ensuring the overall recognition rate of electromyography gesture, this method will be able to reduce the number of features in feature set, according to the change of the average remove redundant features, and construct an optimal reduced EMG feature set. Finally, through the four common hand motion classifiers based on machine learning: SVM, back propagation neural network, linear discriminant analysis, and K-nearest neighbor, this paper tests and verifies the separability of the optimal reduced EMG feature set, and based on this, selects the optimal hand motion classifier to build the optimal hand motion recognition system, improve the hand medical monitoring system, and provide technical reference for the c

关键词： discriminant analysis

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