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

作者： Yue, Zhijian Shen, Zhen dong, Xiangyang Fang, Qihang Wang, Weixing dong, Xisong Xiong, Gang Wang, Fei-Yue University of Chinese Academy of Sciences School of Artificial Intelligence Beijing100049 China Chinese Academy of Sciences State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Beijing100190 China Qingdao Academy of Intelligent Industries Intelligent Manufacturing Center Qingdao266109 China Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Chinese Academy of Sciences State Key Laboratory for Management and Control for Complex Systems Institute of Automation Beijing100190 China

ISBN: (纸本)9798350349252

With the development of continuous fiber-reinforced composites (CFRCs) 3d printing technology, timely, efficient and accurate detection of fiber path defects is essential for ensuring product quality and performance. However, challenges still need to be addressed in this field, such as inadequate training data coverage and the complexity of fiber path structures. These factors hinder the capability of traditional methods to accurately assess the status of printed products. Therefore, developing accurate and robust fiber path defect detection techniques is crucial for CFRCs 3d printing technology. In this paper, we propose a precise detection method for fiber path defects in CFRCs 3d printing using the YOLOv7 object detection model combined with a Squeeze-and-Excitation (SE) attention mechanism. By introducing the SE attention mechanism, we enhance the perception capability of the YOLOv7 model for crucial features, thereby improving the accuracy of fiber path defect detection. The experimental results show that the YOLOv7 model, when augmented with an attention mechanism, achieves an average accuracy of 93.9% in identifying fiber path defects during the printing process. Compared to models without this attention mechanism, the results show that there is 10.7% increase, with a notably enhanced learning capacity during the training phase, which substantiates the efficacy and practicality of the proposed approach. © 2024 IEEE.

关键词： Fiber reinforced plastics

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dependences of the defect, Microstructure and Properties of 15-5ph Martensitic Stainless Steel on the Laser Powder Bed Fusion Process Parameters

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SSRN 2024年

作者： Chen, Bin Li, Jianing Huang, Zhenghua Chen, Feng Yan, Zhiqiao Liu, Jianye Qi, Wenjun Niu, Liuhui School of Materials Science and Engineering Shandong Jianzhu University Shandong Jinan250101 China Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China Guangdong Provincial Engineering and Technology Research Center for Metal 3D Printing Guangdong Hanbang 3D Technology Co. Ltd. Zhongshan528427 China

15-5PH martensitic stainless steel is widely utilized in the marine, chemical, and aerospace industries owing to its high strength and corrosion resistance properties. The highly tailored samples can be produced via laser powder bed fusion technology, however it i15-5PH martensitic stainless steel is widely utilized in the marine, chemical, and aerospace industries owing to its high strength and corrosion resistance properties. The highly tailored samples can be produced via laser powder bed fusion technology, however it is still unknown how to optimize process parameter windows and conduct mechanism research for 15-5PH steel forming. The results show that fusion defects are mostly concentrated in the region with low laser power (P) of 200 W, and there is no obvious distribution pattern in the pore and porosity defects. Excellent dense samples can be formed mainly at medium P of 260 W and medium scanning speed (V) of 1200 mm/s. The proportion of body center cubic structure reaches 91.7% for the hatch space (H) of 0.06 mm, and a heterogeneous layered structure with alternating fine and coarse grain layers is formed. The sample exhibits high strength and excellent plasticity, where the ultimate tensile strength, yield strength, elongation to fracture, impact toughness, and hardness are 1161 MPa, 825 MPa, 17.5%, 122.5 J/cm2, and 34.6 HRC, respectively. The excellent comprehensive property is due to fine-grained strengthening, dislocation strengthening, solid solution strengthening and intrinsic factors/oxide dispersion strengthening.s still unknown how to optimize process parameter windows and conduct mechanism research for 15-5PH steel forming. The results show that fusion defects are mostly concentrated in the region with low laser power (P) of 200 W, and there is no obvious distribution pattern in the pore and porosity defects. Excellent dense samples can be formed mainly at medium P of 260 W and medium scanning speed (V) of 1200 mm/s. The proportion of body center

关键词： 3d printing

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Bending Performance of Ultra High-Performance Concrete Reinforced Concrete Composite Beams by 3d printing

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SSRN 2023年

作者： Guan, Jingyuan Ye, Kehan Wang, Li Li, Zhijian Ma, Guowei Bai, Gang School of Civil and Transportation Engineering Hebei University of Technology 5340 Xiping Road Beichen District Tianjin300401 China Engineering Research Center for Construction 3D Printing of Hebei Tianjin300401 China

The integrated optimization of materials, processes, and structural performance is the development trend for 3d concrete printing. Composite beam reinforced by 3d printed ultra high-performance concrete (3dP-UHPC) was proposed, i.e., 3d printed UHPC was applied as the strengthen skeleton for the entire composite beam. In this study, three optimized forms of 3dP-UHPC skeleton were derived through topology optimization design. Four-point bending tests were conducted on 3dP-UHPC skeleton composite reinforced concrete beams (CRC), rebars locally reinforced CRC beams (R-CRC), and rebars locally reinforced 3d printed concrete beams (R-PC). Additionally, conventionally reinforced concrete beam (RC) was produced for comparison. The results showed that the of CRC and R-PC perform 1/4 and 1/2 flexural capacity of RC, respectively. Their limited flexural capacity led to sudden failures, failing to meet structural load requirements. In contrast, R-CRC exhibited superior stiffness and strength, demonstrating exceptional bending performance for 3d printed concrete beams without the reinforcement of reinforcement cages. This approach significantly enhances the structural load capacity of 3d printed structures while preserving flexibility and reducing reliance on steel cages. The study provides valuable experimental data and methodological guidance for the application of 3d printed concrete structures in structural load-bearing engineering. © 2023, The Authors. All rights reserved.

关键词： 3d printing

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Magnetic Cores for High Conversion Ratio Package Embedded Inductors

Magnetic Cores for High Conversion Ratio Package Embedded In...

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Electronic Components and technology Conference (ECTC)

作者： Sai Saravanan Ambi Venkataramanan Prahalad Murali dustin Allen Gilbert Mohanalingam Kathaperumal Mark d. Losego 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA Department of Materials Science and Engineering The University of Tennessee Knoxville Knoxville USA

ISBN: (数字)9798350375985

ISBN: (纸本)9798350375992

Inductors play a significant role in power delivery networks that help in supplying voltage to the chiplets when the power FETs (field effect transistors) are in the OFF cycle. Miniaturized inductors in the core of a package help in power regulation at high voltages. However, for higher conversion ratios with V in > 5 V, the requirements for magnetic materials become harder to achieve that include: relative permeability of 65, loss tangent (tanδ) < 0.012, and saturation magnetization (H sat ) of > 6 kA/m. To achieve these targets, we have investigated powders based on Fe 6.35 wt% Si, Fe 50 wt% Ni, and FeCuNbSiB (FINEMET) alloys in the form of toroidal soft magnetic composites with an epoxy-resin as a continuous binding phase. Relative permeability at high frequencies (1 MHz to 1 GHz), Ferro Magnetic Resonance frequency (f FMR ), and quasi-static hysteresis losses are studied. Using a custom-built board, small signal measurements without dC bias were performed to compare the inductors based on a previously proposed power loss metric R acx (effective AC resistance per unit inductance, mΩ/nH) studied on a wide number of toroids and packaged inductors at the packaging research center (PRC). A FeNi-FeSi-BCB based composite has been identified with 110-130% increase in relative permeability (18.5-20) compared to FeSi-BCB in the range of 2-20 MHz, with a saturation magnetic moment of 176.04 emu/g. Ball-milling of FeCuNbSiB powder revealed a significant increase in f FMR and a highly stable permeability sweep up to 200 MHz. The frequency stability and average R acx between 15-85% duty cycle of buck converter operation (0.11, 0.28, and 0.65 mΩ/nH at 2, 5 and 10 MHz) did not degrade when subjected to Highly Accelerated Stress Testing (HAST). The results are correlated with the material properties to develop a rationale for synthesizing high frequency magnetic cores for applications in power delivery and management.

关键词： Magnetic cores Magnetomechanical effects Toroidal magnetic fields Magnetic resonance Magnetic hysteresis Stability analysis Permeability

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USV Path Planning Under Marine Environment Simulation Using dWA and Safe Reinforcement Learning 19

USV Path Planning Under Marine Environment Simulation Using ...

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19th IEEE International Conference on Automation Science and engineering, CASE 2023

作者： Qu, Tianci Xiong, Gang Ali, Hub dong, Xisong Han, Yunjun Shen, Zhen Institute of Automation Chinese Academy of Sciences The State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing100190 China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100049 China Institute of Automation Chinese Academy of Sciences Beijing Engineering Research Center of Intelligent Systems and Technology Beijing100190 China Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Qingdao Academy of Intelligent Industries Qingdao266109 China

ISBN: (纸本)9798350320695

It is a challenge for USV navigation due to uncertainties and disturbances in the complex marine environment, which may lead to tilting or collision. However, current path planning methods for USVs lack dynamic environment adaptivity and timeliness. We formulate this problem as a Markov decision Process (MdP) and combine the advantages of dynamic Window Approach (dWA) and Safe Reinforcement Learning (RL) to solve it. First, the state encoding output by dWA is employed as observation to reduce the state dimension. Second, a safety-ensured reward function is designed to avoid collision areas. Then, the actor-critic network based on RL algorithm is used. Along with the RL training, the parameters in dWA is adaptively adjusted. Simulation experiments with dynamic waves and ocean currents demonstrate the adaptivity of our method, with avg. trajectory length decreased by 10%, avg. time cost decreased by 17%, and avg. speed increased by 18%, compared to the case using only dWA. © 2023 IEEE.

关键词： Reinforcement learning

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Exceptional Strength of Mycelium-Bound Composite: A Sustainable Brick Alternative for Construction

Exceptional Strength of Mycelium-Bound Composite: A Sustaina...

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Symposium on Natural Fibers and Biocomposites: A Sustainable Solution, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025

作者： Sharma, deepak Le Ferrand, Hortense School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore Singapore Center for 3D Printing Nanyang Technology University 65 Nanyang Drive Singapore639798 Singapore Future Cities Laboratory Singapore ETH Centre 1 Create Way Create Tower #06-01 Singapore138602 Singapore

ISBN: (纸本)9783031811890

Mycelium-boundMycelium-bound compositescompositesComposite (MBCs) are grown by fungi onto waste lignocellulosic substrate and hence hold significant potential as sustainable materials. However, their wide range of adoption is limited by their typically low strength. Low strength in MBCs is due to the root-like networks of hyphae. The mycelium filaments loosely bind the organic structure, resulting in a porous and lightweight material that lacks the rigidity required for structural applications. This study develops a new method to fabricate MBCs. We use additive manufacturingAdditive manufacturing to fabricate porous triply periodic minimal surface (TPMS) scaffolds from wood-Poly Lactic Acid (PLA) material. The porous TPMS structure provides a higher surface area and a continuous supply of nutrition and oxygen for mycelium development. Mycelium from Ganoderma lucidum is grown on porous structures for 21 days. This study considers two types of TPMS structures: gyroid (G) and inverted wrapped package (IWP). The resultant MBCs showed exceptional strength of 14 MPa, comparable to clay bricks. A comparison between porous structure with and without mycelium showed a 1.27 times improvement in peak strength for the G structure and 1.30 times for the IWP structure at 50% relative density. Mycelium growth depends on the relative density of the organic porous structure, with a maximum mycelium density on 10% and a minimum on 50% porous structure, respectively. Furthermore, results showed mycelium growth is dependent on the design of the porous structure, which opens an avenue for advanced and engineered MBCs. © The Minerals, Metals & Materials Society 2025.

关键词： Brick

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Microfluidic intestinal organoid-on-a-chip uncovers therapeutic targets by recapitulating oxygen dynamics of intestinal IR injury

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Bioactive Materials 2023年第12期30卷 1-14页

作者： Jinjian Huang Ziyan Xu Jiao Jiao Zongan Li Sicheng Li Ye Liu Ze Li Guiwen Qu Jie Wu Yun Zhao Kang Chen Jieshou Li Yichang Pan Xiuwen Wu Jianan Ren Research Institute of General Surgery Jinling HospitalSchool of MedicineSoutheast UniversityNanjing210009China School of Medicine Nanjing UniversityNanjing210093China Department of Rehabilitation The First Affiliated Hospital of Nanjing Medical UniversityNanjing210029China Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing NARI School of Electrical and Automation EngineeringNanjing Normal UniversityNanjing210042China General Clinical Research Center Nanjing Benq HospitalNanjing Medical UniversityNanjing210019China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing211816China

Increasing evidence demonstrates that mammals have different reactions to hypoxia with varied oxygen dynamic *** takes~24 h for tri-gas incubator to achieve steady cell hypoxia,which fails to recapitulate ultrafast oxygen dynamics of intestinal ischemia/reperfusion(IR)*** from the structure of native intestinal villi,we engineered an intestinal organoid chip embedded with engineered artificial microvessels based on coaxial microfluidic technology by using pH-responsive ZIF-8/sodium alginate *** chip was featured on:(i)eight times the oxygen exchange efficiency compared with the conventional device,tri-gas incubator,(ii)implantation of intestinal organoid reproducing all types of intestinal epithelial cells,and(iii)bio-responsiveness to hypoxia and reoxygenation(HR)by presenting metabolism disorder,inflammatory reaction,and cell ***,it was found for the first time that Olfactomedin 4(Olfm4)was the most significantly downregulated gene under a rapid HR condition by sequencing the RNA from the ***,OLFM4 played protective functions on HR-induced cell inflammation and tissue damage by inhibiting the NF-kappa B signaling activation,thus it could be used as a therapeutic ***,this study overcomes the issue of mismatched oxygen dynamics between in vitro and in vivo,and sets an example of next-generation multisysteminteractive organoid chip for finding precise therapeutic targets of IR injury.

关键词： Ionic barrier of ZIF-8 Microfluidics Organoid-on-a-chip Oxygen dynamics Olfm4

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Adaptive Layer Thickness and Lifting Force Control for Bottom Lighting LCd Based Additive Manufacturing

Adaptive Layer Thickness and Lifting Force Control for Botto...

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Annual Conference of Industrial Electronics Society

作者： Hong-Yi Xue Ming-Jong Tsai Han-Wei Wu Graduate Institute of Automation and Control National Taiwan University of Science and Technology High Speed 3D Printing Research Center National Taiwan University of Science and Technology Taipei Taiwan

To improve the printing efficiency of LCd Based Additive Manufacturing System, this study integrates adaptive layer thicknesses processing technique and adaptive lifting speed and position control during the printing process. Firstly, this study prints several samples with different thickness to find out the required curing time of the used resin. Secondly, some square samples with different slicing area are printed under different lifting speed and tensile stress force are recorded for analysis. The relationship between tension and lifting speed for different cross-sectional area can be modeled for the used material. Therefore, the lifting speed for different tensile forces and cross-sectional areas can be obtained by different shapes of objects. A safety factor is employed to obtained the maximum lifting force to improve the success rate of printing and save the printing time. A potentiometer is also equipped on the vertical axis for real-time monitoring the position and cooperates with a load cell to determine whether the printed object is separated from the bottom. In this study, a snowman-shaped object with different slopes is printed to demonstrate the benefit of adaptive layer thickness and the adaptive tension value with different lifting speed. The printing time can be reduced over 40% through the proposed method in which the layer thickness and lifting speed/position are adaptively controlled layer by layer.

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Thermal History Simulation and Support-Based Optimization in L-PBF Manufacturing of Eye-Shaped Catenary Clamps

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Transactions of the Korean Institute of Electrical Engineers 2024年第2期73卷 407-411页

作者： Yun, Seok-Chul Park, Young Shin, Jaeho Intelligence Integrated SW Research Center Intelligent Information R&D Division Korea Electronics Technology Institute Korea Republic of Dept. 3D printing industry-university cooperation foundation Hanbat National University Korea Republic of Dept. of Electrical Engineering Hanbat National University Korea Republic of

This study performed thermal history simulation and strategy optimization for additive manufacturing of eye-shaped catenary clamps used in high-speed railway overhead lines. Instead of the conventional casting material CuAl10Fe2, SUS 316L material suitable for additive manufacturing and having good toughness was used. The thermal analysis simulation software for additive manufacturing was utilized to optimize the additive manufacturing strategy for the parts where heat diffusion was not sufficient. The optimized additive manufacturing strategy was verified by simulation while adding supports, and the accuracy of the simulation was confirmed by comparing the simulation results with the actual experimental results. The results of this study can provide useful guidelines for additive manufacturing of eye-shaped catenary clamps and can be applied to other parts with complex shapes. © 2024 Korean Institute of Electrical Engineers. All rights reserved.

关键词： Thermoanalysis

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Parallel Systems Framework: A Safe and Efficient Testbed for Unmanned Ships 4

Parallel Systems Framework: A Safe and Efficient Testbed for...

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

作者： Fu, Long Shen, Zhen dong, Xisong Han, Yunjun Yang, Shuguang Xiong, Gang Wang, Fei-Yue University of Chinese Academy of Sciences School of Artificial Intelligence Beijing100049 China Chinese Academy of Sciences State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Beijing100190 China Chinese Academy of Sciences Guangdong Engineering Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Shandong Jiaotong University Schoool of Rail Transportation Jinan250399 China Chinese Academy of Sciences State Key Laboratory for Management and Control for Complex Systems Institute of Automation Beijing100190 China

ISBN: (纸本)9798350349252

In this study, unmanned ships test platform based on the parallel systems framework is proposed to improve the test efficiency and accuracy of unmanned ships in complex ocean environment. The parallel intelligence theory and ACP approach, the efficient interaction between virtual and real environment is achieved, which provides more comprehensive and accurate data for unmanned ships testing. Future research will further expand the scope of virtual environment simulation and improve systems accuracy and response speed to a wider range of unmanned ships test requirements. © 2024 IEEE.

关键词： Virtual environments

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