检索结果-内蒙古大学图书馆

7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Wang, Jilai Cheng, Huang Li, Jinzkun Wang, Xiaotian Yuan, Tao China Railway First Survery and Design Institue Group Co. Ltd. Xi'an China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Because of the poor geographical environment of Qinghai-Tibet Railway, the catenary is vulnerable to strike by lightning. At the same time, as the Qinghai-Tibet Railway is laid on the bridge, the probability of lightning striking the rail increases with the bridge rising. As a result, the rail transient potential rises which seriously threatens the safety of equipment and personnel along the railway. Based on the engineering situation of Qinghai-Tibet Railway, this paper establishes a lightning catenary simulation model by the elec-tromagnetic transient simulation software ATP-EMTP. By combining the Elecrto-geometric Model(EGM), we analyzes the lightning withstand level of the catenary at different elevations and bridge heights. We also analyzes the influence of lightning current waveform and rail grounding resistance on rail transient potential when lightning strikes the rail. The simulation results show that the lightning withstand level of the catenary meets the requirements of regulations, and reducing the steepness of lightning current and rail ground resistance can effectively restrain the rise of rail transient potential. © 2020 IEEE.

关键词： Rails

来源：评论

学校读者我要写书评

暂无评论

Ballistic performance of CFRP under normal and oblique impacts by square fragments: Experimental, numerical, and theoretical investigations

引用

Thin-Walled Structures 2025年 215卷

作者： Feng, Bo Dong, Yongxiang Min, Qiang Liu, Jian Shi, Xinping Tian, Yumo An, Fengjiang State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Digital and Agile Aircraft Design Chengdu Aircraft Design & Research Institute Chengdu610091 China Beijing Institute of Electronic System Engineering Beijing 1000854 China

High-performance carbon fibre-reinforced polymer (CFRP) composites are commonly used as external protective structures in military and aerospace applications and are frequently subjected to impact from fragments or projectiles. This study investigated the damage mechanisms of CFRP laminates under normal and oblique impacts from square fragments. Impact tests were conducted on 3–9 mm CFRP laminates using 4 g and 7 g square fragments at velocities ranging from 100 to 1300 m/s and impact angles from 0° to 60° Finite element simulations based on yarn-scale models were also performed. The results revealed that under oblique penetration conditions, the fragment edge initially contacting the target plate caused deeper shear damage. An analytical model was developed to predict the residual velocity of the fragments and the ballistic limit velocity (BLV) of the CFRP laminates. The average error between the model predictions and experimental results was 8.42 %, whereas that between the predictions and simulation results was 3.69 %. Interestingly, the analysis revealed a non-zero minimum resistance angle for the laminate under square fragment impact, at which the BLV of the target plate was minimised. The predicted distribution range of the minimum resistance angle in this study was 23–28° The developed predictive model and identified "minimum resistance angle" provide theoretical foundations for protective engineering design, bridging laboratory research to real-world high-risk applications such as military and aerospace. © 2025 Elsevier Ltd

关键词： Military applications

来源：评论

学校读者我要写书评

暂无评论

Adaptive Robust Control of an Uncertain Robotic Manipulator with Guaranteed Transient and Steady state Performance

Adaptive Robust Control of an Uncertain Robotic Manipulator ...

引用

International Conference on Advanced Robotics and Mechatronics (ICARM)

作者： Yifan Liu Dejie Yu Zilu Wang Zheshuo Zhang Hui Yin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha P. R. China Intelligent Transportation System Research Center School of information and electrical engineering Zhejiang Uni-versity City College Hangzhou Zhejiang P. R. China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou Guangdong P. R. China

Guaranteeing human-specified performance in robot control subject to complex uncertainties is challenging. This study takes time-varying (possibly fast), bounded with unknown bounds uncertainties into consideration in controlling an uncertain robotic manipulator system (URMS). We employ an adaptive law to on-line estimate the unknown bounds for uncertainty compensation, and prescribed transient and steady state performance (TSSP) are guaranteed by using a state transformation technique. As a result, a class of adaptive robust control with prescribed TSSP is proposed. Simulation results are provided to validate the effectiveness of the proposed approach.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of gamma radiation on the sensing characteristics of FPs and FBGs 27

Effect of gamma radiation on the sensing characteristics of ...

引用

27th International Conference on Optical Fiber Sensors, OFS 2020

作者： Li, Zhuoyue Xiao, Yaqin Ran, Zengling Yang, Tingting He, Xiu Xiao, Yanbo Shen, Feng Rao, Yunjiang He, Zhengxi Zhu, Jialiang He, Peng Xu, Sijie Chu, Wangwei Zeng, Debiao Fiber Optics Research Center Key Laboratory of Optical Fiber Sensing & Communications Ministry of Education University of Electronic Science & Technology of China Sichuan Chengdu611731 China Center for Optical Fiber Sensing Zhejiang Laboratory Hangzhou310000 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Chengdu Aircraft Industrial Group Co. Limited 610092 China

The sensing characteristics of Fabry-Perot interferometers (FPIs) and fiber Bragg gratings (FBGs) after irradiation were studied, in which pressure sensitivity of FPI was stable while temperature sensitivity curves of... 详细信息

ISBN: (纸本)9781557523075

关键词： Fiber Bragg gratings

来源：评论

学校读者我要写书评

暂无评论

Coupled fluid-thermal investigation on non-ablative thermal protection system with spiked body and opposing jet combined configuration

引用

Chinese Journal of Aeronautics 2019年第6期32卷 1390-1402页

作者： Jie HUANG Weixing YAO Xianyang SHAN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016China System Design Institute Hubei Aerospace Technology AcademyWuhan 430040China

In this paper, a Non-Ablative Thermal Protection system(NATPS) with the spiked body and the opposing jet combined configuration is proposed to reduce the aerodynamic heating of the hypersonic vehicle, and the coupled fluid-thermal numerical analysis is performed to study the thermal control performance of the NATPS. The results show that the spiked body pushes the bow shock away from the protected structure and thus reduces the shock intensity and the wall heat flux. In addition, the low temperature gas of the opposing jet separates the high temperature gas behind the shock from the nose cone of the spiked body, ensuring the non-ablative property of the spiked body. Therefore, the NATPS reduces the aerodynamic heating by the reconfiguration of the flow field, and the thermal control efficiency of the system is better than the Thermal Protection system(TPS) with the single spiked body and the single opposing jet. The influencing factors of the NATPS are analyzed. Both increasing the length of the spiked body and reducing the total temperature of the opposing jet can improve the thermal control performance of the NATPS and the nonablative property of the spiked body. However, increasing the heat conductivity coefficient of the spiked body can enhance benefit the non-ablative property of the spiked body, but has little influence on the thermal control performance of the NATPS.

关键词： Coupled method Non-ablative Opposing jet Spiked body Thermal protection system

来源：评论

学校读者我要写书评

暂无评论

Study on the mechanism of microcrack propagation in bentonite under confining pressure conditions

引用

Quarterly Journal of Engineering Geology and Hydrogeology 2025年

作者： Guo, Jingna Liu, Jiangfeng Liu, Daoping Zhao, Yu Lei, Min Shi, Hao School of Applied Mathematics Chengdu University of Information Technology Sichuan Chengdu610225 China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and Technology Jiangsu Xuzhou221116 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chendu610213 China School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan232001 China

For underground nuclear disposal repositories, sealing performance is crucial to ensuring long-term operational safety. Bentonite, widely employed as a sealing material, effectively reduces leakage risks owing to its self-healing capacity. However, a comprehensive investigation of gas migration mechanisms in bentonite is imperative to elucidate the underlying leakage dynamics. This study not only offers theoretical insights for the safety assessment and design optimization of disposal repositories but also holds substantial practical significance in ensuring their secure performance. To accurately model gas migration in saturated bentonite, this study systematically investigates the effects of pore pressure on soil deformation and experimentally evaluates the impact of damage evolution on permeability and elastic modulus. Building on these experimental insights, we propose a coupled fluid-solid constitutive model. This model elucidates the progressive development of microcracks within bentonite under increasing gas pressure, providing a mechanistic understanding of fracture propagation in sealing systems. By integrating experimental data from bentonite hydration and gas breakthrough tests, the study verifies that gas migration under flexible boundary conditions is primarily governed by the dilatancy effect of bentonite. Furthermore, the model's validity and applicability are demonstrated. Subsequently, the model is employed to systematically investigate the influence of confining pressure on (1) the evolution of microcracks in bentonite, (2) permeability variations, and (3) gas breakthrough pressure thresholds. Based on these analyses, theoretical mitigation strategies to prevent gas breakthrough are established for specific confining pressure ranges. © 2025 The Author(s). Published by The Geological Society of London. All rights, including for text and data mining (TDM), artificial intelligence (AI) training, and similar technologies, are reserved. For permissions:

关键词： Microcracks

来源：评论

学校读者我要写书评

暂无评论

Nonmonotonic enhancement of nanorod diffusion during 1D to quasi- 2D confinement transition

引用

Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 724卷

作者： Jingbin Yang Jia Zhang Tianshun Shen Ruo-Yu Dong School of Astronautics Beihang University Beijing 100191 China Aircraft and Propulsion Laboratory Ningbo Institute of Technology Beihang University Ningbo 315100 China State Key Laboratory of High-Efficiency Reusable Aerospace Transportation Technology Beijing 100191 China Beijing Key Laboratory of System Design for Reusable Launch Vehicle Beijing 100191 China

Confined nanoparticle diffusion is ubiquitous and holds potential for applications in bio/nanotechnology. Contrary to the conventional belief that confinement slows down diffusion, recent studies have shown that increased confinement can increase the orientation of anisotropic nanoparticles, thereby enhancing their diffusional transport. Despite significant independent advances under 1D or 2D confinement, comparison of different confinement dimensionalities and their transition effects on particle diffusion are largely overlooked. Here, we constructed nanochannels transitioning from 1D (flat walls) to quasi- 2D confinement (sinusoidal walls) and investigated the diffusion of a single nanorod (SNR) using molecular simulations. Our results reveal that during dimensionality transition, stronger confinement improves SNR orientation along the unconstrained direction and leads to more rapid diffusion. The distinction is that, under 1D confinement, SNR diffusion is enhanced monotonically with increasing orientation along the unconstrained direction, whereas under quasi- 2D confinement, the relationship becomes non-monotonic, with an optimal situation yielding the fastest diffusion. We further confirmed that the confinement-induced enhancement of diffusion is not limited to specific confinement shapes, as demonstrated in geometries with sawtooth and square-wave walls, thereby validating its universality. This work could provide design principles for nanochannel geometries to regulate nanoparticle transport in applications such as drug delivery and nanofluidics.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Two-stage optimization model of emergency power supply for improving resilience of the distribution network under flood disaster

Two-stage optimization model of emergency power supply for i...

引用

Science and technology Innovation (IAECST), International Academic Exchange Conference on

作者： Chao Liu Ping Zhou Yongzhong Zhou Qinan Liao Libo Tang Anqi Tao Qianggang Wang Chongqing Electric Power Design Institute Company of Limited Liability Chongqing China State Key Laboratory of Power Transmission Equipment and System Safety and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781665402682

Flood disaster will cause large area power outage of the distribution network, causing huge economic loss. Emergency power supply is an effective strategy to improve the ability of distribution network to deal with flood disaster. However, due to the limitation of flood water, it is difficult for emergency power to reach the accident site, so mobile emergency power needs to be configured in advance. In this paper, a two-stage optimization model of emergency power supply for improving the resilience of distribution network is proposed. Considering the vulnerability modeling of different equipment under flood disaster, multiple island micro-networks are formed by combining medium and low mobile emergency generators and network reconstruction, and power supply can be quickly restored according to load priority order.

关键词： Technological innovation Emergency power supplies Distribution networks Generators Power system reliability Resource management Floods

来源：评论

学校读者我要写书评

暂无评论

Characterization of molten 2LiF–BeF_2 salt impregnated into graphite matrix of fuel elements for thorium molten salt reactor

引用

Nuclear Science and Techniques 2019年第5期30卷 32-39页

作者： Hong-Xia Xu Jun Lin Ya-Juan Zhong Zhi-Yong Zhu Yu Chen Jian-Dang Liu Bang-Jiao Ye Center for Thorium Molten Salt Reactor System Shanghai Institute of Applied PhysicsChinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China USTC

The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy *** was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.

关键词： keywords Molten salt reactor FLiBe Impregnation Graphite matrix

来源：评论

学校读者我要写书评

暂无评论

Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments 2

Structural design and strength analysis of multi-ring packed...

引用

2nd International Conference on Numerical Modelling in Engineering, NME 2019

作者： Jiang, L. Zhang, W. Wu, C.W. Zhang, L.P. Zhang, Y.X. Liu, Z.Y. National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China

Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading. © Published under licence by IOP Publishing Ltd.

关键词： Kinetics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：