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Effect of equivalence ratio on diesel direct injection spark ignition combustion

Journal of Central South University 2020年第8期27卷 2338-2352页

作者： CHEN Zheng QIN Tao HE Ting-pu ZHU Li-jing State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Research Center for Advanced Powertrain Technology Department of Energy and Power EngineeringHunan UniversityChangsha 410082China

Aviation heavy-fuel spark ignition(SI)piston engines have been paid more and more attention in the area of small *** heavy-fuel refers to aviation kerosene or light diesel fuel,which is safer to use and store compared to gasoline *** diesel fuel is more suitable for small aviation application on *** this study,numerical simulation was performed to evaluate the possibility of switching from gasoline direct injection spark ignition(DISI)to diesel DISI *** was injected into the cylinder by original DI system and ignited by *** the simulation,computational models were calibrated by test data from a DI *** on the calibrated models,furthermore,the behavior of diesel DISI combustion was *** results indicate that diesel DISI combustion is slower compared to gasoline,and the knock tendency of diesel in SI combustion is *** a diesel/air mixture with an equivalence ratio of 0.6 to 1.4,higher combustion pressure and faster burning rate occur when the equivalence ratios are 1.2 and 1.0,but the latter has a higher possibility of *** summary,the SI combustion of diesel fuel with a rich mixture can achieve better combustion performance in the engine.

关键词： diesel direct injection spark ignition equivalence ratio combustion knock

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Research on the Bonding Properties of Vitrified Bonds with Porous Diamonds and the Grinding Performance of Porous Diamond Abrasive Tools

Research Square

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Research Square 2021年

作者： Li, Jianwei Fang, Wenjun Wan, Long Liu, Xiaopan Hu, Weida Cao, Dan Han, Kai Li, Yingying Yan, Yonggao Hunan University College of Materials Science and Engineering China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body China Hunan University of Technology Liling ceramic institute China Shangqiu Institute of Technology China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology China

Ordinary diamond presents the disadvantages of poor self-sharpening and concentrated grinding stress when it is used as an abrasive. Moreover, this kind of diamond cannot be well wetted by the vitrified bond, resulting in a lower holding force of the binder to the abrasives (i.e., the diamond is easy to detach from the binder matrix during grinding). These comprehensive factors not only reduce the surface quality of the processed workpiece, but also hinder the processing efficiency. In order to solve these problems, a new type of porous diamond with high self-sharpening properties was prepared using a thermochemical corrosion method in this study. Our results showed a great improvement in pore volume and specifisurface area of the porous diamond compared with ordinary diamond abrasive particles, and the holding force and wettability of vitrified bond to the porous diamond abrasive particles were also improved. Compared with ordinary diamond abrasive tools, porous diamond abrasive tools showed a 29.6% increase in grinding efficiency, a 15.5% decreased in grinding ratio, a 27.5% reduction in workpiece surface roughness, and the scratches on the silicon wafer surface were reduced and refined. © 2021, CC BY.

关键词： Grinding (machining)

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Alternating Direction Method of Multipliers Improved Online Power Management in a Fuel Cell Hybrid Bus

Alternating Direction Method of Multipliers Improved Online ...

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第33届中国控制与决策会议

作者： Xiaodong Wei Chao Sun Weiwei Huo Fengchun Sun State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University National Engineering Laboratory for Electric Vehicles Beijing Institute of Technology School of Mechanical and Electrical BeijingInformation Science and Technology University

ADMM is an important convex optimization method in solving complex control *** fuel cell and battery hybrid vehicles,the power distribution control of fuel cell engine and the battery is critical,which is called energy *** paper,for the first time,proposed an ADMM-based energy management strategy for a fuel cell hybrid *** augmented lagrangian equation and scaled dual form of the system model are established,to satisfy the standard form of *** are developed to validate the performance of proposed method under the driving cycles CHTC-HT and *** results show that the ADMM-based energy management approach is able to realize real-time implementation,while maintaining over 95% optimality of hydrogen consumption compared to DP offline results.

关键词： Fuel cell hybrid bus Energy management Convex optimization Alternating Direction Method of Multipliers

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Deep-potential enabled multiscale simulation of gallium nitride devices on boron arsenide cooling substrates

arXiv

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arXiv 2022年

作者： Wu, Jing Zhou, E. Huang, An Zhang, Hongbin Hu, Ming Qin, Guangzhao State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Institut für Materialwissenschaft Technische Universität Darmstadt Darmstadt64289 Germany Department of Mechanical Engineering University of South Carolina ColumbiaSC29208 United States Research Institute of Hunan University in Chongqing Chongqing401133 China Greater Bay Area Institute for Innovation Hunan University Guangdong Province Guangzhou511300 China

High-efficient heat dissipation plays critical role for high-power-density electronics. Experimental synthesis of ultrahigh thermal conductivity boron arsenide (BAs, 1300 W m-1K-1) cooling substrates into the wide-bandgap semiconductor of gallium nitride (GaN) devices has been realized. However, the lack of systematic analysis on the heat transfer across the GaN-BAs interface hampers the practical applications. In this study, by constructing the accurate and high-efficient machine learning interatomic potentials, we performed multiscale simulations of the GaN-BAs heterostructures. Ultrahigh interfacial thermal conductance (ITC) of 260 MW m-2K-1 is achieved, which lies in the well-matched lattice vibrations of BAs and GaN. The strong temperature dependence of ITC was found between 300 to 450 K. Moreover, the competition between grain size and boundary resistance was revealed with size increasing from 1 nm to 1000 μm. Such deep-potential equipped multiscale simulations not only promote the practical applications of BAs cooling substrates in electronics, but also offer new approach for designing advanced thermal management systems. © 2022, CC BY.

关键词： Gallium nitride

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Corrigendum to “Achieving strength-ductility balance in AZ31-WE43 Mg alloys by symmetric extrusion-shear process at various temperatures” [Mater. Today Commun. 41 (2024) 110712]

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Materials Today Communications 2024年 41卷

作者： Chaowei Zeng Wei Peng Wenyu Du Yan Wang Yujiang Liu Yang Li Hongjun Hu Zhuoran Zeng Materials Science and Engineering College Chongqing University of Technology Chongqing 400050 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha 410082 China

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Corrigendum “Achieving strength-ductility balance in AZ31-WE43 Mg alloys by symmetric extrusion-shear process at various temperatures” [Mater. Today Commun. 41 (2024) 110712]

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Materials Today Communications 2024年 41卷

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On Modeling of Extruded Thin-Walled Multi-Cell Structures Incorporating Anisotropy Yielding, Strain Hardening and Damage Failure

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Thin-Walled Structures 2025年

作者： Ruyang Yao Bei Zhang Qiang Niu Qing Li Guangyong Sun State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha 410082 China Zhejiang Key Laboratory of Intelligent Vehicle Comprehensive Safety Geely Automobile Research Institute (Ningbo) Co. Ltd. Ningbo 315336 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Sydney NSW 2006 Australia

Thin-walled multi-cell structures (TWMCS) have been extensively utilized in a range of transportation facilities, including automobiles, railways, aircraft, and marine vessels, due to their exceptional lightweight and energy absorption capabilities. However, current numerical models often oversimplify the material behaviors, significantly limiting their reliable applications in engineering practice. This study aims at developing a systematic modeling framework to address this issue, through simulating the extruded AA6063-T6 TWMCS against axial crushing process. Comprehensive experimental characterization of the base material AA6063-T6 was conducted first to investigate its yielding, strain hardening, and damage fracture behaviors under complex stress states. Constitutive models for the base material were established by incorporating the Hill 90 anisotropic yield, Voce strain hardening, and GISSMO damage failure models. The material parameters of these models were precisely calibrated through an in-house inverse identification approach. Based on this, a reliable numerical model was then developed to achieve good correlation with the experimental results. The influence of constitutive models on numerical results at a structural-scale was thoroughly investigated, highlighting the importance of understanding the intrinsic mechanical properties of materials and making rational constitutive models in engineering design. Finally, this study provides perspectives for future research to further enhance the safety and lightweight performance of protective structures.

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Research on safety improvement of the passenger vehicle based on 25% small overlap crash 12

Research on safety improvement of the passenger vehicle base...

引用

12th International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2020

作者： Fei, Jing Zhao, Qingjiang Zhang, Jian Liu, Yu Shi, Aimin State Key Laboratory of Vehicle NVH and Safety Technology Chongqing401122 China China Automotive Engineering Research Institute Co. Ltd Chongqing401122 China Hunan University Changsha410082 China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170817

The influence of the China Insurance Automotive safety Index(C-IASI) in the industry is expanding day by day. At the same time, the small overlap crash is getting increasing attention as an important part of the index. In this paper, a B-class vehicle with a poor(P) rating level was selected. Then considering both restraint system and structure, the vehicle body force transmission path, side head protection such as adding a side curtain were optimized to decrease demerits in connection with the problems of large occupant compartment intrusion, large lateral steering wheel movement and excessive head lateral movement. Finally, evaluation rating of restraint system and dummy kinematics was changed from poor (P) to acceptable (A), and occupant compartment intrusions have achieved acceptable (A) or above after optimization. © 2020 IEEE.

关键词： Accident prevention

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Correction: Ultra-high thermal conductivities of tetrahedral carbon allotropes with non-simple structures

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Physical chemistry chemical physics : PCCP 2021年第36期23卷 20725-20726页

作者： Qiang Chen Pei Zhang Tao Ouyang Xiaoliang Zhang Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 P. R. China. gzqin@***. Hunan Key Laboratory for Micro-Nano Energy Materials & Device and School of Physics and Optoelectronics Xiangtan University Xiangtan 411105 Hunan China. ouyangtao@***. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China. zhangxiaoliang@***.

Correction for 'Ultra-high thermal conductivities of tetrahedral carbon allotropes with non-simple structures' by Qiang Chen , , 2021, DOI: 10.1039/d1cp02347k.

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An Enhanced Hybrid Springback Compensation Approach: Springback Path – Displacement Adjustment Method For Complex Shaped Products of Sheet Metal Forming

Research Square

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Research Square 2021年

作者： Gong, Zhihui Singh, Mandeep Fang, Bohao Wei, Dongbin State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha410082 China School of Mechanical and Mechatronic Engineering University of Technology Sydney NSW2007 Australia

Springback compensation is critical in sheet metal forming. Advanced techniques have been adopted in the design stage of various sheet metal forming processes, e.g. stamping, some of which are for complex shaped products. However, the currently available numerical approaches are not always sufficiently accurate and reliable. To improve the accuracy of springback compensation, an enhanced hybrid springback compensation method named Springback Path – Displacement Adjustment (SP-DA) method has been developed in this study based on the well-known conventional displacement adjustment (DA) method. Its effectiveness is demonstrated using FEM analysis of low, medium and high strength steels adopted in automobile industry, in which a symmetrical model owning geometry complexity similar to an auto body panel was established. The results show this new enhanced SP-DA method is able to significantly improve the accuracy of springback compensation comparing to conventional displacement adjustment technique. © 2021, CC BY.

关键词： High strength steel

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