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The Influence of the Density of CNT Arrays on Their Atomic Oxygen Erosion Effects 2

The Influence of the Density of CNT Arrays on Their Atomic O...

2021 2nd International Conference on Internet of Things, Artificial Intelligence and Mechanical Automation, IoTAIMA 2021

作者： Li, Man Liu, Yuming Li, Yu Yu, Qiang Zhang, Yongtai Liu, Chong Beijing Institute of Spacecraft Environment Engineering Beijing China Science and Technology on Reliability and Environment Engineering Laboratory Beijing China

To investigate the characteristic of carbon nanotube (CNT) arrays with high resistance to the hazardous conditions of atomic oxygen in space environment, the erosion effects of atomic oxygen on CNT arrays with different density have been studied by atomic oxygen simulation equipment. To characterizing the change of the surface morphologies of CNT arrays before and after atomic oxygen exposition, A scanning electron microscope (SEM) analysis method have been used. The SEM images shows that the morphologies of the surface of CNT arrays after atomic oxygen experiment are quite different from those before atomic oxygen experiment. The higher density CNT arrays are etched away more uniformly. The erosion yield of the CNT arrays with higher density is much less than that with lower density, which means that the CNT materials have different atomic oxygen erosion yield. The resistance ability of CNT materials to atomic oxygen is depending on their density. © Published under licence by IOP Publishing Ltd.

关键词： Scanning electron microscopy

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Energy transfer and high-sensitivity frequency response of magnetic liquid energy harvester suitable for low frequency environments

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Sensors and Actuators A: Physical 2025年 392卷

作者： Yang, Xiaorui Long, Hui Wang, Haichao An, Guoqing Zheng, Hao Yang, Wenrong Department of Electrical Engineering Hebei University of Science and Technology Shijiazhuang050000 China School of Electrical Engineering and Automation Hefei University of Technology Hefei230009 China The State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300000 China

Aiming at the self-powered problem of sensor nodes in low-frequency vibration environments, this paper proposes a magnetic liquid vibration energy harvester(ML-VEH), which uses magnetic liquid as the core material and has the advantages of simple structure, sensitive energy harvesting, and strong robustness. This device uses magnetic liquid as the damping unit to convert vibration energy into damping kinetic energy, which is then converted into electromagnetic energy, forming a solid-liquid energy harvester with the vibration reduction performance. Firstly, the dynamic model and damping characteristics of the ML-VEH under the action of a magnetic field are theoretically analyzed. Secondly, the amplitude frequency response characteristics of the electrical energy output and mechanical vibration of the energy harvester are explored. Finally, the tuning characteristics of the magnetic field on the ML-VEH are analyzed, and its power supply feasibility is experimentally verified. The research results indicate that the ML - VEH is sensitive to both the vibration environment and the magnetic field. The system reaches its resonance frequency at 2.7 Hz, resulting in a vibration reduction rate of approximately 30 % and an output voltage of 3.31 mV. By adjusting the magnetic field to achieve resonance frequency offset, the adaptability of the ML - VEH in low - frequency environments is improved. In the future, by combining multiple energy harvesting methods and multimodal outputs, the magnetic liquid vibration energy harvester can achieve continuous and safe operation in battery - free low - frequency vibration environments. © 2025

关键词： Vibration analysis

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Microstructure and properties evolution of plasma sprayed Al_(2)O_(3)-Y_(2)O_(3) composite coatings during high temperature and thermal shock treatment

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Journal of Rare Earths 2021年第6期39卷 718-727,I0004页

作者： Xingyu Wang Xiaolong Wang Xiaowen Sun Yong Yang Chen Zhang Yuduo Ma Yuhang Cui Yanchun Dong Dianran Yan You Wang Key Lab.for New Type of Functional Materials in Hebei Province State Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologySchool of Materials Science and EngineeringHebei University of TechnologyTianjin 300132China Department of Materials Science Harbin Institute of TechnologyHarbin 150001China

Al_(2)O_(3)-Y_(2)O_(3) composite powder with TiO_(2) additive was plasma sprayed to prepare Al_(2)O_(3)-Y_(2)O_(3) composite *** micro structure and properties evolution of the Al_(2)O_(3)-Y_(2)O_(3) coatings during high temperature and thermal shock resistance were *** results show that the micro structure of the Al_(2)O_(3)-Y_(2)O_(3)-TiO_(2) coating is more uniform than that of the Al_(2)O_(3)-Y_(2)O_(3) ***,amorphous phase is formed in the two *** Al_(2)O_(3)-Y_(2)O_(3)(-TiO_(2)) coatings were heat treated for 2 h at temperatures of 800,1000 and 1200℃,*** is found that the microstructure and properties of the two coatings have no obvious change at 800℃.Some of the amorphous phase is crystallized at1000℃,and meanwhile Y_(2)O_(3) and Al_(2)O_(3) react to form YAG phase and YAM *** 1200℃,all of the amorphous phases are *** heat treatment,the micro hardness of the two coatings is *** thermal shock resistance of the Al_(2)O_(3)-Y_(2)O_(3) system coatings can be improved by using TC4 titanium alloy as substrate and with NiCrAlY bonding ***,the Al_(2)O_(3)-Y_(2)O_(3)-TiO_(2) coating exhibits better thermal shock resistance due to the addition of TiO_(2).

关键词： Al_(2)O_(3)-Y_(2)O_(3)coating TiO_(2) Plasma spraying Thermal shock resistance Microstructure evolution

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Effectiveness Assessment and Improvement for Vulnerable Road User Head Protection Testing and Evaluation Program Based on Real-world Accident Reconstructions

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Zhongguo Gonglu Xuebao/China Journal of Highway and Transport 2025年第3期38卷 177-187页

作者： Wang, Fang Liu, Zhang-Chi Hu, Lin Zou, Wei Shi, Liang-Liang Liu, Yu Zhou, Zhou School of Automotive and Mechanical Engineering Changsha University of Science & Technology Hunan Changsha410114 China Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Hunan Changsha410114 China China Automotive Engineering Research Institute Co. Ltd. Chongqing401122 China Division of Neuronic Engineering KTH Royal Institute of Technology Stockholm14152 Sweden

Vulnerable road users (VRUs) face high risks of injury and death from traffic accidents. The current VRU head protection program relies on a single head impact velocity and injury assessment criteria that fail to account for brain tissue strain. This limitation affects the effectiveness of simulating real-world impacts and the accuracy of head injury risk assessments. In this study, the VRU head impact boundary conditions were extracted based on the reconstruction of 40 real-world pedestrian VRU head impacts. Using the Total Human Model for Safety (THUMS) head finite element model and headform impactor, this study explored the effects of real head impact boundary conditions on head kinematics and injury under procedural test scenarios and compared these conditions with test procedure scenarios. The results indicate that the peak linear acceleration in the current test procedure scenarios is higher;however, the peak rotational velocity is significantly lower than that observed in real-world accidents. Different impact locations have significant effects on the head kinematics and injury response parameters, particularly in stiffer areas, such as the windshield edges and lower right corner, where the injury risk under regulatory conditions is higher than that in real accident cases. In contrast, the opposite is true in other windshield areas. This study suggests that future programs or virtual assessments should diversify the head impact boundaries and injury assessment criteria to consider the differences in impact locations and the effects of head rotation on brain tissue injuries. For most windshields (non-edge areas), increasing the linear velocity enhances head rotation, and rotational injury assessment criteria should therefore be introduced. For future virtual assessments, injury criteria based on brain tissue strain should be used to assess VRU head injury risk in real accidents more comprehensively and accurately. © 2025 Chang'an University. All rights reserve

关键词： Windshields

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An Asymmetric Arc-Shaped Coupler–Based WPT Design for High Misalignment Tolerance Charging of AUVs

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International Journal of Circuit Theory and Applications 2025年第0期

作者： Deng, Shuming Cai, Changsong Wang, Junhua Jiang, Yufeng Zhang, Xian Wan, Leke Wu, Xi Du, Yinfeng Zhou, Yingguo Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan University Hubei Wuhan China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin China School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang China

In contact with a wide area of seawater, the use of a typical planar coil structure generates the problem of large fluctuations of the overall efficiency and power when the system encounters environmental disturbances. In order to improve the misalignment tolerance of the system, this article proposes a high misalignment tolerance WPT system with constant current output based on the asymmetric arc-shaped coupler and LCC-P compensation topology. This design effectively increases the horizontal and rotation misalignment tolerance, so that the fluctuation of the overall efficiency and power of the system greatly declines when coming across disturbances. The article firstly establishes the equivalent circuit model and deduces the equations about parameter configuration and the output characteristics of the system. Furthermore, the asymmetric arc-shaped coupler is designed, and the mutual inductance fluctuation of the coupler is verified to be within 8.7% through simulation. Finally, a 500-W-level experimental prototype based on the WPT design is built and tested to verify the performance and effectiveness. The prototype achieves stable performance with an output power about 580 W and an 85% overall efficiency when the horizontal misalignment distance varies from 0 to 40 mm and the misalignment angle varies from 0 to 35°. © 2025 John Wiley & Sons Ltd.

关键词： Autonomous underwater vehicles

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Deep-Learning-Based Image-Driven Modelling of Woven Ceramic Matrix Composites: Incorporating Real Void Morphology and Damage-Induced Behaviour

SSRN

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SSRN 2025年

作者： Guo, Weiyu Wang, Long Hou, Chuantao Du, Yonglong Chen, Chao Zhang, Daxu School of Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Structure and Environment Engineering Beijing100076 China

An image-driven method for generating high-fidelity finite element models for woven ceramic matrix composites is presented in this paper. The model incorporates the real morphologies of fibre tows, matrix, and inter-tow voids. With high-resolution X-ray CT scans of plain woven Cf/SiC composites, a deep-learning-based image segmentation method was employed to accurately segment the fibre tows from the CT images. A convex hull-based algorithm, alongside a thorough tow trajectory tracking method, was developed to handle fibre tow intersections and categorise the cross-sections of the fibre tows in the segmented images. For void identification, a rapid approach based on the Watershed transform was implemented. The resulting geometrical model demonstrates a high degree of morphological fidelity with the 3D CT image of the material. Furthermore, a progressive damage-induced nonlinear stress-strain relation for fibre tows was developed and incorporated into the CT image-driven finite element model. The predicted stress-strain curve has excellent correlations with experimental results, demonstrating higher accuracy compared to the ideal model, and therefore more accurately reflects the stress distributions. © 2025, The Authors. All rights reserved.

关键词： Ceramic matrix composites

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Comprehensive quantitative evaluation of security and trustworthiness of trusted CNC system

Comprehensive quantitative evaluation of security and trustw...

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2024 International Conference on Computer Application and Information Security, ICCAIS 2024

作者： Hu, Xuan Du, Jun Li, Xuetong Lu, Songfeng CEPREI Laboratory Guangdong Guangzhou511370 China The Ministry of Industry and Information Technology Key Laboratory of Performance and Reliability Testing and Evaluation for Basic Software and Hardware Guangdong Guangzhou511370 China HuaTech Technology Co. Ltd. Beijing100195 China Inner Mongolia First Machinery Group Co. Ltd. Inner Mongolia Baotou014030 China School of Cyber Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

ISBN: (纸本)9781510689312

Nowadays, few studies in the existing literature analyze the comprehensive quantitative evaluation methods for the security and trustworthiness of trusted computer numerical control (CNC) system. By constructing a high-quality, systematic, and complete comprehensive quantitative evaluation system, this paper solves the above problem to a certain extent. Firstly, the factors affecting the security and trustworthiness of trusted CNC system are analyzed based on relevant standards and engineering experience. Then, a framework model (indicator system) for the comprehensive quantitative evaluation of the security and trustworthiness of trusted CNC system is established, including four layers of task layer, quality support layer, criteria layer, and scoring point layer. Furthermore, a combination of expert decision-making and fuzzy mathematics is used to evaluate the security and trustworthiness quality level of trusted CNC system throughout the entire lifecycle. This method avoids the shortcoming of using expert decision-making alone, which violates the fuzzy characteristic of continuous gradient evaluation results, as well as the instability caused by the subjectivity of expert decision-making. The results of case studies show that the proposed method is scientific and effective. © The Authors.

关键词： Numerical methods

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Design of fast response high-voltage power supply for the electrostatic deflection system in a low-energy particle spectrometer 7th

Design of fast response high-voltage power supply for the el...

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7th International Conference on Signal and Information Processing, Networking and Computers, ICSINC 2020

作者： Li, Hao Peng, Yuchuan Ge, Lili Wang, Junfeng Peng, Zhong Tang, Zhenyu Liu, Qinghai Qin, Wei Li, Tao Ren, Qiongying Zhao, Hua Zong, Yi Beijing Institute of Spacecraft Environment Engineering Beijing China Science and Technology on Reliability and Environment Engineering Laboratory Beijing China

ISBN: (纸本)9789813341012

A fast response high-voltage power supply for the electrostatic deflection system in a low-energy particle spectrometer is designed. The high-voltage power supply uses high-voltage optocouplers as the core amplifying devices, and the output stage is a two-arm push-pull amplifier composed of two high-voltage optocouplers. The experimental results show that the high-voltage power supply can output either positive or negative voltage from the same output port, and the output voltage range is from −3 kV to +3 kV, which can meet the demand of the electrostatic deflection system for the bipolar voltage supply. The adjustment speed of the output voltage is fast. The time of voltage rise or fall does not exceed 1.7 ms, which can speed up the scanning speed of the spectrometer and improve the time resolution. The output stage adopts a push-pull amplification structure, which can improve the temperature stability of the output voltage. The design satisfies the expected performance of the high-voltage power supply for the electrostatic deflection system. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Optoelectronic devices

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reliability Analysis and Electronic Products Evaluation Based on Electromagnetic Performance Parameters 12

Reliability Analysis and Electronic Products Evaluation Base...

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12th International Conference on Quality, reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2022

作者： Sun, Chao Wang, Yanfang Chen, Ying CRSCD Test Center CRSC Research & Design Institute Group Co. Ltd Beijing China Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University Beijing China

ISBN: (纸本)9781839538360

Electronics are susceptible to many forms of electromagnetic interference sources. Under electromagnetic interference, the reliability of electronic equipment may degrade, leading to a shortened lifetime of electronic equipment. Current product reliability analysis methods usually consider product faults from the perspective of life only and ignore the impact of product failure on performance parameters. In this paper, we proposed a reliability analysis and evaluation method of electronic products based on electromagnetic performance parameters. From the perspective of product electromagnetic performance, this method provides a basis for improving the product function design. By locating the weak part of the product, determining the key performance parameters, modeling electromagnetic performance margin, this method also can evaluate the product performance reliability under electromagnetic interference. © 2022 IEEE.

关键词： Signal interference

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Integration of interlayer surface enhancement technologies into metal additive manufacturing:A review

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Journal of Materials science & technology 2023年第34期165卷 94-122页

作者： Yufei Chen Xiancheng Zhang Donghong Ding Xiaowei Wang Kaiming Zhang Yixin Liu Tiwen Lu Shantung Tu Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China Institute of Reliability Centered Manufacturing Nanjing Tech UniversityNanjing 211816China Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment Nanjing 211816China College of Materials Shanghai Dianji UniversityShanghai 201306China

Additive manufacturing(AM)has the advantages of rapid prototyping,high design freedom,and flexible manufacturing,while the mechanical properties of additively manufactured products are not uniform due to inherent defects and residual *** of interlayer surface enhancement(SE)technologies into AM is a potential solution to improve the microstructure,close defects,residual stress state,mechanical properties,and chemical properties of formed *** paper reviews the current literature on hybrid AM process through the combination of SE and AM,and proves the possibility of integrating SE technologies into AM from the technical *** the improvement effects of SE processes on AM parts are introduced in terms of microstructure,defects,residual stress,mechanical properties,and chemical ***,considering the commonly used directed energy deposition(DED)process and ultrasonic impact treatment(UIT),a closed-loop quality control framework for integration of interlayer UIT into the DED process is *** research directions to the hybrid AM and interlayer SE are pointed out.

关键词： Surface enhancement Additive manufacturing Residual stress Multi-sensor monitoring

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