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International Conference on Consumer Electronics, Communications and Networks

作者： Muxi Lei Shubin Wei Zhengbao Lei Yonghan Li School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha China Key Laboratory of Highway Engineering Ministry of Education Changsha University of Science and Technology Changsha China Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Ministry of Education Changsha University of Science and Technology Changsha China Hunan Provincial Communications Planning Survey and Design Institute Changsha China

ISBN: (纸本)9781612844589

With the crank-slider mechanism, applied the principle of Cutting the screw thread(CST) to the low rear protective device of truck, devised a new type of device which supplied a new solution for the crash incompatibility. Firstly, according to the dimension of certain type of Foton light-duty truck and the requirement of regulation, took the maximum transmission angle as optimized object, with the programming solution in Excel, obtained the length of crank-slider mechanism. Secondly, with the 3D modeling in Solidworks, obtained the 3D model, and eliminated the interference through its motion simulation module, which proved the device is feasible.

关键词： Optimization Solid modeling Mathematical model vehicle crash testing Three dimensional displays Absorption Programming

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A research of real-time protective barrier system for automobile safety

A research of real-time protective barrier system for automo...

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International Conference on Consumer Electronics, Communications and Networks

作者： Sujuan Wang Yonghan Li Jian Zhao Zhengbao Lei Muxi Lei Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Ministry of Education Changsha University of Science and Technology Changsha China Key Laboratory of Highway Engineering Ministry of Education Changsha University of Science and Technology Changsha China Hunan Province Communications Planning Survey and Design Institute Changsha China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha China

To improve the self-protection capability of automobile, comprehensively analyze the related safety factors, detect the real-time status of the factors while driving by using sensor technique, and then judge the real-time security level. Based on it, a real-time protective barrier system for automobile safety can be established, which can execute corresponding actions and avoid danger automatically, with combining the brake system and the screw-shear type vehicle collision energy absorption system.

关键词： Tires Automobiles safety Switches Belts Fluids

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A research of cooperative control method on multisystem containing CST for automobile safety

A research of cooperative control method on multisystem cont...

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International Conference on Consumer Electronics, Communications and Networks

作者： Sujuan Wang Yonghan Li Jian Zhao Zhengbao Lei Muxi Lei Yiheng Liu Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Changsha Ministry of Education University of Science and Technology Changsha China Hunan Province Communications Planning Survey and Design Institute Changsha China Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Ministry of Education Changsha University of Science and Technology Changsha China Key Laboratory of Highway Engineering Ministry of Education Changsha University of Science and Technology Changsha China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha China Shanghai University of Finance and Economics Shanghai China

To improve the safety protection capability of automobile while driving, and better to play the role of CST in protecting automobile, aiming at some factors affecting road safety, and combined with the design requirements of control system, the article researched the judge method about driving safety level, human-computer interaction response alerts and emergency measures. And by using cooperative control structure mode on multi-system and the centralized cooperative strategy, the article designed the cooperative control scheme on multisystem containing CST for automobile safety. This cooperative control scheme had better real-time performance and simpler design than a single control system.

关键词： Security safety Fasteners Real time systems Automobiles

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A research of similarity design of collision guardrails under the overpass

A research of similarity design of collision guardrails unde...

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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Sujuan Wang Zhengbao Lei Jian Zhao Yonghan Li Muxi Lei Yiheng Liu Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety Ministry of Education Changsha University of Science and Technology ChangSha China Key Laboratory of Highway Engineering Ministry of Education Changsha University of Science and Technology ChangSha China School of Automotive & Mechanical Engineering Changsha University of Science and Technology ChangSha China Hunan Province Communications Planning Survey & Design Institute ChangSha China School of Civil Engineering and Architecture Changsha University of Science and Technology China School of International Business Administration Shanghai Shanghai University of Finance & Economics Yangpu District China

In order to solve the safety problem of different grades roads and crashworthy capacity of overpass design, to meet the traffic safety requirements under different conditions, by using similar principle, several overpass crashworthy barrier in different levels had been gotten here, and had been proved to have better adaptability. In preliminary work, the optimum structure parameter of SH overpass crashworthy barrier had been gotten through orthogonal test, and this research is also based on the orthogonal test majorization result. During the similarity design, the similarity design for every parameter of barrier would be done through measuring the impact force, and to get the optimum structure parameters of overpass crashworthy barriers in different degrades. Finally, every group similarity majorization result had been checked, and the result showed that different grades crashworthy barrier which based on similarity principle design could meet the safety requirements for different crashworthy grades overpasses. This design not only could reduce cost, but also had better suitability and engineering utility.

关键词： vehicle crash testing Road transportation Computer crashes vehicles safety Concrete Deformable models

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Time-based metamodeling technique for vehicle crashworthiness optimization

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Computer Methods in Applied Mechanics and engineering 2010年第37-40期199卷 2497-2509页

作者： Wang, Hu Li, G.Y. Li, Enying Key Laboratory of Advanced Technology for Vehicle Body Design and Manufacture College of Mechanical and Automobile Engineering Hunan University Changsha 410082 China School of Logistics Central South University of Forestry and Teleology Changsha 41004 China

In automotive industry, structural optimization for crashworthiness criteria is of special importance in the early design stage. To reduce the vehicle design cycle, metamodeling techniques have become so widespread... In this study, a time-based metamodeling technique is proposed for the vehicle design. The characteristics of the proposed method are the construction of a time-based objective function and establishment of a metamodel by support vector regression (SVR). Compared with other popular metamodel-based optimization methods, the design space of the proposed method is expanded to time domain. Thus, more information and features can be extracted in the expanded time domain. To validate the performance of the time-based metamodeling technique, cylinder impacting and full vehicle frontal collision are optimized by the proposed method. The results demonstrate that the proposed method has potential capability to solve the crashworthiness vehicle design. © 2010 Elsevier B.V.

关键词： Crashworthiness

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Study on fiber laser overlap-welding of automobile aluminum alloy

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Zhongguo Jiguang/Chinese Journal of Lasers 2010年第8期37卷 2091-2097页

作者： Mei, Lifang Chen, Genyu Jin, Xiangzhong Zhang, Mingjun Chen, Ming State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan 410082 China Department of Mechanical Engineering Xiamen University of Technology Fujian 361024 China

Experimental study on high power fiber laser deep-penetration welding of automobile 5052 aluminum alloy in an overlap configuration is carried out, and the main influencing factors on fiber laser welding are analyzed, and the micro-structure and the mechanical properties of the welded joints are measured. Through analyzing fiber laser welding performance of automobile aluminum alloy, the influencing factors such as fiber core diameter, gap thickness between two plates, kinds of shielding gas, and the protection way on the morphology and properties of overlap-welded joint are prominent. High welding speed and narrow weld pool and heat affected zone (HAZ) can be obtained when welding by fiber laser. Under the proper welding condition, the weld topography of top surface and bottom surface is even and continuous. Micro-hardness in fusion zone is higher than that of base material. The tensile-strength of welding joints is higher than its shear strength. The fracture is happened in HAZ and its topography is a mixture of ductile fracture as main mode and brittle fracture as subsidiary mode.

关键词： Aluminum alloys

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Optimisation of sheet metal forming processes by the use of adaptive intelligent sampling scheme based metamodelling method

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International Journal of Materials and Product technology 2010年第2-3期38卷 153-172页

作者： Hu, Wang Enying, Li Yao, Li Guang Gang, Zheng State Key Laboratory of Advanced Technology for Vehicle Design and Manufacture College of Mechanical and Automotive Engineering Hunan University Changsha 410082 China

A metamodelling technique based on an adaptive intelligent sampling scheme and Kriging interpolation method are suggested in this study. The proposed method is applied for drawbead geometry parameters inverse problem. The suggested sampling scheme applies uniform Latin Hyper Sampling to generating initial samples. According to the different metamodelling strategies, the adaptive intelligent sampling scheme is implemented for updating new samples. To validate the suggested method, the non-linear function as benchmark is optimised via proposed strategy. Finally, the sheet forming optimisation problem indicates that suggested method is a high accuracy, efficiency and rapid convergence for design of mould in practice. Copyright © 2010 Inderscience Enterprises Ltd.

关键词： Inverse problems

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Microstructure and creep properties of casting AM80 alloy containing Ca and Sr

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hunan Daxue Xuebao/Journal of hunan University Natural Sciences 2010年第4期37卷 46-52页

作者： Li, Luo-Xing Liang, Gui-Ping Bai, Xing Liu, Bo Liu, Yang-Sheng State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan Univ Changsha Hunan 410082 China College of Materials Science and Engineering Hunan Univ Changsha Hunan 410082 China Automotive Engineering Institute Body Technology Research Department Chongqing Changan Automobile CO LTD Chongqing 401120 China

The effects of alkaline elements Ca and Sr additions on the microstructure and mechanical properties of AM80 magnesium alloy were investigated by using scanning electron microscopy(SEM), X-ray diffraction(XRD) and creep properties testing at elevated temperature. The results show that the microstructures of the as-cast alloys are refined by adding 0.2%Sr and 0.5%~2.5%Ca. A high-melting point Al2Ca phase dispersedly formed at the grain boundaries in the AM80 alloy due to the priority combination of Ca and Al, thus the formation of β-Mg17Al12 phase was reduced. The mechanical properties of the alloys were also improved due to the existence of the addition of Ca and Sr. The β-Mg17Al12phase had two kinds of precipitation forms, which were non-continuous precipitation and continuous precipitation during creep process. The non-continuous β-Mg17Al12phase precipitated at the grain boundaries and was perpendicular to the grain boundaries, decreasing the creep properties of AM80 magnesium alloy. The elevated temperature creep properties of the alloys were greatly improved because the low-melting point β-Mg17Al12 phase was replaced by high-melting point Al2Ca phase, which prevented the grain boundaries sliding. The creep mechanism was best when the mass fraction of Ca was 2.5%.

关键词： Microstructure

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Automotive thermal management analysis by applying joint 1D/3D simulation

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Qiche Gongcheng/Automotive engineering 2010年第9期32卷 793-798+817页

作者： Liang, Xiaobo Yuan, Xiayi Gu, Zhengqi Yang, Yi Yuan, Zhiqun Xiangtan Electric Manufacturing Group Heavy-Dutyequipment Co. Ltd. Xiangtan 411100 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China Mechanical Engineering Department Xiamen University of Technology Xiamen 361005 China

1D, 3D and joint 1D/3D simulation tools are used respectively to analyze the performance of cooling system in a new car with the results showing the superiority of joint 1D/3D simulation in automotive thermal management analysis. On this basis, some schemes are proposed such as adding air baffle and changing the rear structure of bumper to improve the efficiency of cooling air induction. The results of analysis indicate that after improving modification, cooling airflow passing through radiator increases by about 4.2%, and the outlet coolant temperature of engine reduces by 6.1°C, hence the performance of cooling system is improved.

关键词： Cooling

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Rapid Parallel Calculation of shell Element Based On GPU

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AIP Conference Proceedings 2010年第1期1252卷 755-761页

作者： Jian Hua Wanga Guang Yao Lia Sheng Lib Guang Yao Li aState key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University 410083 ChangSha bLaboratory of HCI and Multimedia Department of Computer Science and Technology Peking University 100871 Beijing China cCollege of Mechanical Engineering and Automation Huaqiao university Xiamen 361021 China

Long computing time bottlenecked the application of finite element. In this paper, an effective method to speed up the FEM calculation by using the existing modern graphic processing unit and programmable colored rendering tool was put forward, which devised the representation of unit information in accordance with the features of GPU, converted all the unit calculation into film rendering process, solved the simulation work of all the unit calculation of the internal force, and overcame the shortcomings of lowly parallel level appeared ever before when it run in a single computer. Studies shown that this method could improve efficiency and shorten calculating hours greatly. The results of emulation calculation about the elasticity problem of large number cells in the sheet metal proved that using the GPU parallel simulation calculation was faster than using the CPU’s. It is useful and efficient to solve the project problems in this way.

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