检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Ma, Yugao Zhang, Yingnan Yu, Hongxing Huang, Shanfang Deng, Jian Chai, Xiaoming Zeng, Chang Zhang, Zhuohua He, Xiaoqiang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Engineering Physics Tsinghua University Beijing100084 China

Screen-wick heat pipes are efficient passive heat transfer devices. The heat transfer capacity is determined by the capillary pressure, which is related to the film curvature inside the screen wick. A capillary evaporating film model was developed for the screen wick that divided the film into a capillary pressure microlayer region and a macroscopic film. The film surface shape in the capillary pressure microlayer region is mainly influenced by the long-range molecular forces (disjoining pressure) and the surface tension, while the film surface shape in the macroscopic film is affected by the wick geometry. The numerical results show that the present model more accurately predicts the three-dimensional characteristics of the liquid film inside the screen wick than the classical model. The wire opening distance and the wire diameter affect the capillary pressure and the flow path in the wick. As the liquid film recedes into the wick, the capillary force first increases and then decreases. The film dynamics in the wick are related to the liquid height, which automatically adapts to the required evaporation and pressure balance for a given heat load. High operating temperatures can lead to a mismatch between the capillary head and the pressure loss, leading to dry out in the wick. Thus, this work provides a reference for operating alkali-metal wick heat pipes. © 2022, The Authors. All rights reserved.

关键词： Heat pipes

来源：评论

学校读者我要写书评

暂无评论

Forming Circle Formations of Multi-agent systems Under Actuator Faults 5th

Forming Circle Formations of Multi-agent Systems Under Actu...

引用

5th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2021

作者： Liu, Jiajun Ru, Xinfeng Xia, Weiguo Wang, Chen China National Aeronautical Radio Electronic Research Institute and National Key Laboratory of Science and Technology on Avionics System Integration Shanghai China Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education and School of Control Science and Engineering Dalian University of Technology Dalian China National Engineering Research Center of Software Engineering and the State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing China

ISBN: (纸本)9789811939976

A distributed fault-tolerant formation control law is designed in this paper for multi-agent systems under external disturbances and actuator faults including time-varying loss of effectiveness faults. The initial position of each agent is already on a circle and the control purpose is to form a desired formation on this circle. Based on this local information, a distributed adaptive formation control law is designed by employing the congelation of variables method to deal with time-varying actuator faults. Finally, a simulation example is given to verify the effectiveness of the adaptive fault-tolerant control design method. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Perceived vs. Objective Human Performance in Diagnostic Tasks: Under-Confidence or Over-Confidence?

SSRN

引用

SSRN 2022年

作者： Lyu, Xi Li, Zhizhong Ma, Quan She, Manrong Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Industrial Engineering Tsinghua University Beijing100084 China

Humans are not very good at assessing their own performance, and usually exhibit over-confidence. Little effort has been done to investigate how and how well diagnosticians perceive their performance of sub-processes of diagnosis, for example information seeking and information integration. This study analyzed the performance data of an experiment of diagnosing an accident in a simulated nuclear power plant. The objective performance was measured by eight indicators and the perceived performance was measured by three indicators. Difference relations and correlations between these indictors were explored. Results showed that on one hand there were systematic deviations between perceived and objective performance, on the other hand the perceptions did have some validity. Perceptions of information seeking manifested under-confidence while perceptions of information integration and the overall diagnosis manifested over-confidence. The authors argue that these two biases were mutually complementary and facilitating rather than contradictory. The findings could be used to help diagnosis-related training, operation and decision making. © 2022, The Authors. All rights reserved.

关键词： Information retrieval

来源：评论

学校读者我要写书评

暂无评论

Development And Optimization of Airborne Display Scene Based on SCADE 4

Development And Optimization of Airborne Display Scene Based...

引用

4th International Academic Exchange Conference on science and technology Innovation, IAECST 2022

作者： Song, Qian Zhang, Li Tian, Ze Xi'an Polytechnic University School of Electronic Information Shaanxi xi'an710600 China Key Laboratory of Aviation Science and Technology on Integrated Circuit and Micro-System Design Shaanxi xi'an710068 China

ISBN: (纸本)9798350320008

With the rapid development of avionics display field, the traditional graphics software development method can no longer meet the needs of high security and efficiency. This paper studies a development method based on SCADE Display, a high security graphics application development tool, analyses the principle and characteristics of SCADE Display, applies SCADE Display to design airborne display scene models, and tests, analyses and optimizes the process on a home-made test platform. Finally, the experimental results show that the optimized solution can effectively improve the development efficiency and graphics frame rate, and also verify the adaptability and functionality of the home-made platform. © 2022 IEEE.

关键词： Software design

来源：评论

学校读者我要写书评

暂无评论

Research on The Parametric Solid Modeling Method of Solid Rocket Motor for Multiphysics Simulation 13

Research on The Parametric Solid Modeling Method of Solid Ro...

引用

13th International Conference on Mechanical and Aerospace Engineering, ICMAE 2022

作者： Ren, Jiaren Bao, Fu-Ting Wei, Ran Dai, Lin Zhang, Jiandong Northwestern Polytechnical University Science and Technology on Combustion Internal Flow and Thermal-Structure Laboratory Xi'an710072 China Beijing System Design Insitute of the Electro-Mechanic Engineering Beijing100000 China

ISBN: (数字)9781665472357

ISBN: (纸本)9781665472357

Solid Rocket Motor (SRM) design engineers urge for a method that can design SRM with high efficiency and realize the adjustment of the parameters within limits, aiming at roughly evaluating the quality characteristics of the SRM and rapidly getting the multi-physics fields used for working process simulation under the circumstances of the burning regression. Based on the Creo platform, this paper proposed a standard process for parametric design of SRM and tracking the burning regression by utilizing the concept of Top-down modeling and the method of feature modeling respectively. Additionally, the function of modifying parameters, regenerating models, and exporting files was encapsulated in programs by the secondary development of Creo, avoiding the complexity and tediousness of manual operation. © 2022 IEEE.

关键词： design

来源：评论

学校读者我要写书评

暂无评论

In-Situ Study on Factors Impeding Dislocation Motion in Fe9cr1.5w0.4si F/M Steel During High Temperature Heating

SSRN

引用

SSRN 2023年

作者： Ding, Yifan Yuan, Fan Cao, Ziqi Ren, Jiacheng Li, Yuanmin Xin, Yong Ran, Guang College of Energy Xiamen University Xiamen361102 China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen361102 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610213 China Nuclear Power Institute of China Chengdu610213 China

Plastic deformation is driven by the movement of dislocations on a microscopic scale, and the mobility of these dislocations determine the strength of the material. Forest dislocations and dislocation loops are often considered to be important factors that impede dislocation movement, but their effectiveness is called into question at high temperature. Here, in-situ heating was performed on irradiated Fe9Cr1.5W0.4Si ferritic martensitic steel in the temperature range of 873-923 K, and the interaction between dislocation lines and obstacles was investigated to reveal the mechanism that led to easier dislocation gliding. Dislocations tended to glide in several planes at the same time and only glided as a whole in one plane occasionally. It was discovered that dislocations usually glided in high index planes such as {123} planes. When moving dislocations intersected with forest dislocations, a new mechanism was found where the segments for different dislocations with the same Burgers vector could exchange, which was important for the moving dislocation to cut through the forest dislocations without decreasing their mobility. The reactions between dislocations and loops included absorption, break away and rebound. Meanwhile, statistical results indicated that the highest ratio was about 48% for the case where loops were restored and dislocations broke away, demonstrating that the loops were not strong obstacles when interacting with moving dislocations at high temperature. © 2023, The Authors. All rights reserved.

关键词： Chromium alloys

来源：评论

学校读者我要写书评

暂无评论

Mechanical Properties and Thermal Shock Resistance of SrAl_(2)Si_(2)O_(8) Reinforced BN Ceramic Composites

引用

无机材料学报 2024年第10期39卷 1182-1188页

作者： WANG Bo CAI Delong ZHU Qishuai LI Daxin YANG Zhihua DUAN Xiaoming LI Yanan WANG Xuan JIA Dechang ZHOU Yu International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Structural-Functional Integration Materials School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China China Resources Cement Technology R&D Co. LtdGuangzhou 510000China The First Military Representative Office of the Army Equipment Department in Beijing Beijing 100072China The Fourth System Design Department Fourth AcademyChina Aerospace Science and Industry Corporation LimitedBeijing 100048China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Hexagonal boron nitride(h-BN)ceramics have become exceptional materials for heat-resistant components in hypersonic vehicles,owing to their superior thermal stability and excellent dielectric ***,their densification during sintering still poses challenges for researchers,and their mechanical properties are rather *** this study,SrAl_(2)Si_(2)O_(8)(SAS),with low melting point and high strength,was introduced into the h-BN ceramics to facilitate the sintering and reinforce the strength and ***,BN-SAS ceramic composites were fabricated via hot press sintering using h-BN,SrCO_(3),Al_(2)O_(3),and SiO_(2) as raw materials,and effects of sintering pressure on their microstructure,mechanical property,and thermal property were *** thermal shock resistance of BN-SAS ceramic composites was *** show that phases of as-preparedBN-SAS ceramic composites are h-BN and h-SrAl_(2)Si_(2)O_(8).With the increase of sintering pressure,the composites’densities increase,and the mechanical properties shew a rising trend followed by a slight *** a sintering pressure of 20 MPa,their bending strength and fracture toughness are(138±4)MPa and(1.84±0.05)MPa·m^(1/2),*** sintered at 10 MPa exhibit a low coefficient of thermal expansion,with an average of 2.96×10^(-6) K^(-1) in the temperature range from 200 to 1200℃.The BN-SAS ceramic composites prepared at 20 MPa display higher thermal conductivity from 12.42 to 28.42 W·m^(-1)·K^(-1) within the temperature range from room temperature to 1000℃.Notably,BN-SAS composites exhibit remarkable thermal shock resistance,with residual bending strength peaking and subsequently declining sharply under a thermal shock temperature difference ranging from 600 to 1400℃.The maximum residual bending strength is recorded at a temperature difference of 800℃,with a residual strength retention rate of 101%.As the thermal shock temperature difference increase,the degree of oxida

关键词： BN matrix composite hot-press sintering mechanical property thermal shock resistance service reliability

来源：评论

学校读者我要写书评

暂无评论

Integrated optimization design of smart morphing wing for accurate shape control

引用

Chinese Journal of Aeronautics 2021年第1期34卷 135-147页

作者： Xiaojun GU Kaike YANG Manqiao WU Yahui ZHANG Jihong ZHU Weihong ZHANG Unmanned System Research Institute Northwestern Polytechnical UniversityXi'an 710072China State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Poly technical UniversityXi'an 710072China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China

Smart morphing wing, which is equipped with smart materials and able to change structural geometry adaptively, can further improve aerodynamic efficiency of aircraft. This paper presents a new integrated layout and topology optimization design for morphing wing driven by shape memory alloys(SMAs). By simultaneously optimizing the layout of smart actuators and topology of wing substrate, the ultimately determined configuration can achieve smooth, continuous and accurate geometric shape changes. In addition, aerodynamic analysis is carried out to compare smart morphing wing with traditional hinged airfoil. Finally, the optimized smart wing structure is constructed and tested to demonstrate and verify the morphing functionality. Application setbacks are also pointed out for further investigation.

关键词： Layout optimization Morphing wing Shape memory alloy Shape morphing Topology optimization

来源：评论

学校读者我要写书评

暂无评论

An Induction Curing Technique for Cfrp Laminate Via Magnetic Particle-Induced In-Situ Heating

SSRN

引用

SSRN 2024年

作者： Li, Yichao Hu, Xiafen Hao, Lei Liang, Jiqiu Wu, Dan Sun, Ao Jin, Peng School of Aerospace Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Hubei Key Laboratory of Advanced Aerospace Propulsion Technology System Design Institute of Hubei Aerospace Technology Academy Hubei Wuhan430040 China

Curing high-performance CFRP structures with economical and energy-efficient techniques other than oven or autoclave is important for the widespread application of the composite. In this work, a novel magnetic particle-induced in-situ heating method to cure CFRP laminates with various layup sequences was proposed. Heating characteristics, mechanical properties and porosities of [0]8, [0/90]4s and [0/45/90/-45]2s CFRP laminates were experimentally investigated. Results showed that all the laminates can undergo a consistent, layup-independent two-staged heating curve via regulating the magnetic field intensity. Under 5.5h curing time and 13wt% magnetic particle loading, flexural strength and modulus of three stacking-sequenced CFRP laminates cured by induction heating were 12.4%, 6.3%, 21.9% and 9.9%, 10.9%, 5.4% higher than oven cured counterparts. While porosity slightly increased by 0.85%, 0.62%, 0.56%. Although detailed parameterized research should be conducted, the proposed new curing method showed great potential for fabricating advanced CFRP composite structures without autoclave or oven. © 2024, The Authors. All rights reserved.

关键词： Ovens

来源：评论

学校读者我要写书评

暂无评论

BDGSE: A Symbolic Execution Technique for High MC/DC

BDGSE: A Symbolic Execution Technique for High MC/DC

引用

IEEE International Conference on Software Quality, Reliability and Security (QRS)

作者： Huangli Cai Zhiyi Zhang Yifan Jian Dan Li Zhiqiu Huang Collage of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Ministry Key Laboratory for Safety-Critical Software Development and Verification Nanjing University of Aeronautics and Astronautics Nanjing China

Modified Condition/Decision Coverage (MC/DC) is a test coverage standard with excellent fault detection capability, which is widely used in testing safety-critical software. Symbolic execution generates test cases automatically to achieve high code coverage. However, since symbolic execution uses short-circuit evaluation to evaluate decisions, it fails to guarantee the consistency of other conditions in a decision required by the MC/DC criterion. As a result, it is incapable of generating MC/DC test cases to test safety-critical systems adequately. To solve this problem, we propose Branch Dependence Guided Symbolic Execution (BDGSE), a symbolic execution technique for high MC/DC. The approach utilizes static analysis to compute the branch dependencies, then guides symbolic execution to selectively explore paths and simplify test cases, and finally generates a small number of test cases to achieve high MC/DC coverage. Our experimental results show that BDGSE can generate high-quality test cases. Although BDGSE generates fewer test cases, it can achieve higher MC/DC coverage than SPF and random methods, and the fault detection capability of test cases generated by BDGSE is comparable to that of test cases generated by SPF.

关键词：

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：