检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Wang, Youheng Hou, Xianjun Yu, Hong Guan, Weiwei Zhao, Danjiao Ma, Yuxin Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China Wuhan University of Technology Chongqing Research Institute Chongqing410121 China

As an environmentally friendly material, biochar is increasingly employed in the field of heat transfer and thermal conduction. In this study, nano-biochar was prepared from high-pressure homogenization using sesame stalks as the raw material. It was incorporated into ethylene glycol and its dispersion stability, viscosity and thermal conductivity were investigated. The nano-biochar was stably dispersed in ethylene glycol for 28 days. When the concentration of nano biochar added to ethylene glycol was less than 1%, the impact on viscosity was negligible. The addition of 3% nano-biochar to ethylene glycol improved the thermal conductivity by 5.2%, which could be attributed to the graphitized structure and Brownian motion of the nano biochar. Overall, nano biochar has the potential to be applied in automotive thermal management. © 2024, The Authors. All rights reserved.

关键词： Ethylene glycol

来源：评论

学校读者我要写书评

暂无评论

Accelerated Solid-Liquid Interdiffusion Bonding of Cu Joint Using a Cu10ni Alloy Mesh Reinforced Sac305 Composite Solder

SSRN

引用

SSRN 2023年

作者： Liu, Jiajun Xiao, Yong Li, Dan Liu, Bowen Yan, Fei Zhang, Jian School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Highly reliable packaging interlayer materials are essential for utilizing the benefits of wide band-gap power devices. In this study, a two-dimensional mesh structure of Cu-10Ni (wt.%) alloy skeleton-reinforced SAC305 (Sn-3.0Ag-0.5Cu, wt.%) solder was employed to create solid-liquid interdiffusion (SLID) bonding connections on a Cu substrate at 250 °C and 0.03 MPa auxiliary pressure. The microstructural evolution and the mechanical property strengthening mechanisms of bonded joints with different composite solders were investigated. Due to the addition of Cu-10Ni alloy skeleton, the Cu-Ni atoms diffused into the Sn melt and acted as heterogeneous nucleation sites, contributing to the rapid nucleation and growth of (Cu,Ni)6Sn5 grains. The incorporation of Ni inhibited the merging and coarsening of intermetallic compound (IMC) grains, and the joint was composed of fine-grained (Cu,Ni)6Sn5 phase and interspersed Cu10Ni skeleton. Shear strength of the joint at soldering time 210 s reached 47.75 MPa, marking a 104.58% enhancement compared to the pristine SAC305 solder joint. The influence of grain refinement on the mechanical properties of the joint was discussed based on the Hall–Petch relationship. The grain boundary strengthening effect synergized with the toughening effect of the alloy skeleton, ultimately achieving highly reliable joints. © 2023, The Authors. All rights reserved.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

Advances in bioorganic molecules inspired degradation and surface modifications on Mg and its alloys

引用

Journal of Magnesium and Alloys 2022年第3期10卷 723-745页

作者： Lei Cai Di Mei Zhao-Qi Zhang Yuan-ding Huang Lan-Yue Cui Shao-Kang Guan Dong-Chu Chen M.Bobby Kannan Yu-feng Zheng Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China MagIC-Magnesium Innovation Centre and Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck Straûe 1Geesthacht 21502Germany School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China School of Engineering University of NewcastleCallaghanNSW 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQL 4811Australia School of Materials Science and Engineering Peking UniversityBeijing 100871China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China

Mg alloys possess biodegradability,suitable mechanical properties,and biocompatibility,which make them possible to be used as biodegradable ***,the uncontrollable degradation of Mg alloys limits their general *** addition to the factors from the metallic materials themselves,like alloy compositions,heat treatment process and microstructure,some external factors,relating to the test/service environment,also affect the degradation rate of Mg alloys,such as inorganic salts,bioorganic small molecules,bioorganic *** influence of bioorganic molecules on Mg corrosion and its protection has attracted more and more *** this work,the cutting-edge advances in the influence of bioorganic molecules(i.e.,protein,glucose,amino acids,vitamins and polypeptide)and their coupling effect on Mg degradation and the formation of protection coatings were *** research orientations of biomedical Mg alloys in exploring degradation mechanisms in vitro were proposed,and the impact of bioorganic molecules on the protective approaches were also explored.

关键词： Magnesium alloy Biomaterial Bioorganic molecules Degradation Coating Glucose.

来源：评论

学校读者我要写书评

暂无评论

Real-Time Pose Correction and Registration of Complex Workpiece in Robotic Machining Considering Normal Consistency Constrains

SSRN

引用

SSRN 2023年

作者： Ye, Songtao Liu, Hongdi Wu, Hao Cheng, Weikang Yan, Sijie Zhu, Dahu State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China HUST-Wuxi Research Institute Wuxi214174 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

Efficient and precision model registration of complex workpiece with arbitrary pose is a challenging task that determines the effects of intelligent robotic machining. Aiming at the problems of limited field of view of 3D vision sensors such as surface structured light and the complexity of scanning-splicing-registration algorithm, in this paper a real-time pose correction and registration algorithm of complex workpiece in robotic machining considering normal consistency constrains is proposed. Specifically, the operations on ellipse feature detection and center point extraction are performed based on the arc-support line segment, and then the actual three-dimensional coordinate of the ellipse is obtained by the camera conversion matrix. Furthermore, considering the constrained normal consistency of the center points set of ellipses on the model surface, the pose of the target workpiece is corrected in real-time by the improved ICP registration algorithm. Taking the automotive flywheel shell as a typical application object, the experimental results demonstrate that the registration correction time of the proposed algorithm is 0.5s, and the registration accuracy can reach 0.35mm. The repetitive correction time of the algorithm after arbitrarily changing the workpiece pose is less than 1s, and the positioning accuracy of the guiding robot is less than 1.5mm. On the premise of satisfying the robotic machining quality requirements, the pose of the complex workpiece model can be corrected in real-time for subsequent robotic machining. © 2023, The Authors. All rights reserved.

关键词： Intelligent robots

来源：评论

学校读者我要写书评

暂无评论

Study of occlusion problem in stereo matching

Study of occlusion problem in stereo matching

引用

ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Jianguo Liu Xuesong Li Qin Qin Hao Zhang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan Hubei CN College of Computer and Information Technology China Three Gorges University Yichang China State Grid Hubei Yichang Electric Power Supply Company China

The occlusion problem in the field of stereo matching is analyzed systematically by finding out reasons why the problem arises. Combining the literature published in recent years, the ideas and algorithms to solve the occlusion problem are summarized and classified. The contribution of this paper is to help other researchers to gain an overall understanding of occlusion, which enables them to choose suitable post-processing algorithms and improves the performance of stereo matching algorithm.

关键词： Classification algorithms Stereo vision Cameras Filling Interpolation Image segmentation Mathematical model

来源：评论

学校读者我要写书评

暂无评论

Editorial: Metallic Biomaterials for Medical Applications

引用

Frontiers in Materials 2021年 8卷

作者： Wang, Liqiang Liu, Chaozong Xie, Lechun State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China Institute of Orthopaedic and Musculoskeletal Science University College London Royal National Orthopaedic Hospital Stanmore United Kingdom Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan China

Biomaterials are natural or artificial materials used to make structures or implants to replace lost or diseased biological structures to restore form and function. In actual clinical situation, they are used in the complex environment of body fluid, so the requirements for the structure and properties of biomaterials are very strict. Biomaterials require great physical and chemical stability, however, some alloy elements, toxic and biological incompatible, harm the human body and some metals' mechanical properties don't match the human body. Therefore, for further improving the biological and mechanical properties of metallic biomaterials, many attempts have been adopted to design novel metallic biomaterials and different advanced processing and preparation technologies have been developed in the content of this *** alloys are widely used for dental and implant materials because of their superior biocompatibility, corrosion resistance and specific strength compared with other metallic implant materials. In the aspect of Ti alloys, Liu et al. investigated the antibacterial properties of various surface nano-modification of Ti implant materials and the related procedures, and the surface nanomodification of Ti materials were discussed from three aspects: nanostructures formation procedures, nanomaterials loading, and nano-morphology (DOI:10.3389/fbioe.2020.576969). Cheng et al. investigated a biomedical beta type Ti-25Nb-3Zr-2Sn-3Mo alloy plate via cold rolling deformation, and the alloy plates possessed various mechanical properties owing to the different morphology, size and volume fraction of α precipitated phases, which would be deemed as a potential material in the orthopedic field (DOI:10.3389/fbioe.2020.598529). Cheng et al. also investigated the microstructure evolution and mechanical properties of metastable beta type titanium alloy (Ti-B12) after different aging treatments. MTT test with L929 cells showed that the cytotoxicity of Ti-B12 w

关键词： biomaterials medical applications metal titanium magnesium

来源：评论

学校读者我要写书评

暂无评论

Prediction Model of Thrust Force Induced by Main Cutting Edge in Cfrp Drilling Considering the Influence of Cutting Speed

SSRN

引用

SSRN 2023年

作者： Dai, Longyu Li, Shujian Li, Pengnan Zhang, Hua Wang, Zhaohui Chen, Yizhe School of Mechanical Engineering Hunan University of Science and Technology Xiangtan411201 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

In CFRP (carbon fiber reinforced plastics) drilling, the thrust force induced by the main cutting edge of drill bit is a crucial factor affecting the quality of hole-making. The cutting speed induced by the spindle speed can cause changes in the strain rate of CFRP materials, which affects their cutting performance and further affects the thrust force. Therefore, the cutting speed is a factor that cannot be ignored in studying the drilling mechanism of CFRP. In this paper, the contact state between the main cutting edge and the workpiece materials in CFRP drilling is analyzed, the failure models of fibers are separately established under the action of the main cutting edge and its rake face, the material strain rate caused by cutting speed is calculated. Ultimately, the prediction model of thrust force induced by main cutting edge in CFRP drilling considering the influence of cutting speed is developed, and the accurate solution of fiber fracture process is realized. The reliability of the prediction model is verified by conducting experiments on drilling CFRP. Results indicate that compared to the case without considering the influence of cutting speed, the proposed model can improve the prediction accuracy of 9.8%-29.2% in the spindle speed range of 7000-11000 rpm. Additionally, the influence mechanism of cutting speed on material strain rate, modulus, and machining damage during CFRP drilling is revealed. © 2023, The Authors. All rights reserved.

关键词： Strain rate

来源：评论

学校读者我要写书评

暂无评论

A Hybrid Optimization Approach for Discrete-Time H∞ Static-Output-Feedback Control Problem

A Hybrid Optimization Approach for Discrete-Time H∞ Static-...

引用

第三十四届中国控制会议

作者： Zhi-Yong Feng Li Xu Zhen-Tao Liu Dan-Yun Li Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Hubei Collaborative Innovation Center for Automotive Components Technology Department of Electronics and Information Systems Akita Prefectural University School of Automation China University of Geosciences

ISBN: (纸本)9781467374439

Optimizing the coordinate transformation matrix is a newly proposed iterative LMI-based approach for solving the H∞ static-output-feedback(SOF) control of discrete-time systems. Once a proper initial coordinate transformation matrix was found, a locally optimal solution for the H∞ SOF control problem can be ensured. However, the problem of how to choose the initial matrix needs to be further studied. This paper applies a cone complementarity linearization(CCL) strategy to solve this problem. Then, a hybrid optimization approach is developed to solve the H∞ SOF control problem. Finally, numerical examples are provided to demonstrate the effectiveness and advantages of the proposed method.

关键词： H∞ control,Static output feedback,Linear matrix inequality(LMI)

来源：评论

学校读者我要写书评

暂无评论

Final Hydrogen Mass Determined from Refueling Parameters

引用

Energy Procedia 2017年 105卷 1370-1375页

作者： Xu Wang Jinsheng Xiao Pierre Bénard Richard Chahine Hubei Key Laboratory of Advanced Technology for Automotive Components and Hubei Collaborative Innovation Center for Automotive Component Technology School of Automotive Engineering Wuhan University of Technology Hubei 430070 China Hydrogen Research Institute Université du Québec à Trois-Rivières QC G9A 5H7 Canada

The final hydrogen mass in the tank at the end of the filling process of a compressed hydrogen storage system is a key indicator to show whether the tank has met the requirement of high final state of charge (SOC). In order to improve the SOC, the influencing factors on the final hydrogen mass and contribution of the influencing factors to the final hydrogen mass need to be investigated. To address this issue, a lumped parameter model has been developed and a thermodynamical analysis has been presented, thus we can obtain an analytical solution of the final hydrogen temperature. By rearranging the analytical solution, the function relationship between the final hydrogen mass and the refueling parameters can be obtained. In this article, we express the final hydrogen mass as the function of the mass filling rate, initial pressure and inlet temperature. For the three cases, the effects of mass filling rate, initial pressure and inlet temperature on the final mass are also shown, further the deduced equations are used to fit the reference data, the fittings show good agreement. With the fitted parameters, a new formula can be proposed to express the function relationship between final mass and the three parameters. We believe this study contributes to providing invaluable guidance in developing advanced refueling standard.

关键词： Hydrogen storage Refueling Fast filling Final mass State of charge Safety

来源：评论

学校读者我要写书评

暂无评论

Estimation of Final Hydrogen Temperatures During Refueling 35 MPa and 70 MPa Tanks

引用

Energy Procedia 2017年 105卷 1363-1369页

作者： Ji Cheng Jinsheng Xiao Pierre Bénard Richard Chahine Hubei Key Laboratory of Advanced Technology for Automotive Components and Hubei Collaborative Innovation Center for Automotive Component Technology School of Automotive Engineering Wuhan University of Technology Hubei 430070 China Hydrogen Research Institute Université du Québec à Trois-Rivières QC G9A 5H7 Canada

Based on the analytical solution of a lumped parameter model for fast filling of hydrogen storage tank, the final hydrogen temperature under final pressures of 35 MPa and 70 MPa are both fitted very well with the reference data through curve and surface fittings. The results show effects of ambient temperature, initial pressure and filling rate on the final hydrogen temperature. Reducing the rate of hydrogen filling, reducing the ambient temperature or increasing the initial pressure can effectively reduce the final hydrogen temperature in the tank. We suppose this study not only helps to know the relationship between the final hydrogen temperature and refueling condition, but also lets us learn how to control refueling processes.

关键词： Hydrogen storage Safety Refueling Fast filling Thermodynamics Heat transfer

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：