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检索条件"机构=Hunan Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle"

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Dissipated energy measurements of metal material during high-cycle fatigue test process

Dissipated energy measurements of metal material during high...

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13th International Conference on Fracture 2013, ICF 2013

作者： Li, Yuan Maquin, Francois Liu, Zhicheng Jiang, Chao Han, Xu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China Department of Traffic and Transportation Engineering College of Basic Education for Commanding Officers National University of Defense and Technology Changsha 410003 China Arts et Metiers ParisTech BP 508 Rue St Dominique Chalons-en-Champagne 51006 France

ISBN: (纸本)9781629933696

In this paper, the high-cycle fatigue characterization of 316L stainless steel was studied based on dissipated energy measurement. At first, the dissipated energy per cycle was deduced from temperature field of specimen surface using an experimental mechanical method. Then, variations of dissipation energy per cycle were in-situ monitored during each high-cycle fatigue test under different stress levels. The results show that dissipated energy is mainly constant after the initial 5% cycles of total fatigue lifetime. Dissipated energy versus fatigue lifetime fitting curve shows the same pattern as the traditional stress versus fatigue lifetime curve.

关键词： High-cycle fatigue

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Collapse test of a 3-story half-scale RC frame structure

Collapse test of a 3-story half-scale RC frame structure

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Structures Congress 2013: Bridging Your Passion with Your Profession

作者： Xiao, Y. Zhao, Y.B. Li, F.W. Kunnath, S. Lew, H.S. MOE Key Laboratory of Building Safety and Energy Efficiency Hunan University Changsha Hunan 410082 China University of Southern California Los Angeles CA 90089 United States Hunan Institute of Architectural Design Changsha Hunan 410011 China Department of Civil and Environmental Engineering University of California Davis CA United States Hunan University China National Institute of Standards and Technology Gaithersburg MD United States

ISBN: (纸本)9780784412848

The progressive collapse of structures under accidental loading is a serious threat to public safety. In this paper, the results of recent research on the dynamic response, failure mechanism and changes in the load transfer paths of a 3-bay x 3-bay, 3-story, half-scale reinforced concrete frame structure subjected to a series of sudden column removals are presented. A corner column and an adjacent column along the short span direction, two middle columns along the long span direction and one interior column were suddenly removed by impact load. After the imposed failure of the respective columns, the forces resisted by the removed columns were transferred to the surrounding components. The structure was on the verge of local collapse following the removal of the two exterior columns in the long span direction but performed well in all other column removal scenarios. © 2013 American Society of Civil Engineers.

关键词： Reinforced concrete

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Research on the behavior of a passenger car in JRS virtual testing

Research on the behavior of a passenger car in JRS virtual t...

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The 10th Int. Forum of Automotive Traffic safety(INFATS)

作者： Qian Peng Hongwu Huang Yong Han Clive Chirwa Jikuang Yang Department of Mechanical Engineering Xiamen University of Technology School of Built Environment & Engineering University of Bolton State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

ISBN: (纸本)9781467356527

The Jordan Rollover System (JRS) is a dynamic test rig designed by the Centre for Injury Research (CFIR) to reconstruct real world vehicle rollover crashes. Its accuracy in predicting the real accident injury potential to belted occupants in the front seats has yet to be validated. This paper shows, numerically using finite element modelling of the JRS and vehicle, the important characteristics in terms of roof intrusion and overall kinetic characteristics. The vehicle model is based on the Bolton Automotive & Aerospace Research Group (BAARG) state-of-the-art Ford Fiesta developed in LS-DYNA 3D code as a public domain research tool. Both the JRS and the Ford Fiesta models were optimised and coupled in view of facilitating the evaluation, which included the validation of simulation results with roof crush test data. To further investigate the kinematic characteristics and roof crush profiles, a virtual model and analysis was conducted at a baseline condition with respect to roll angle, pitch angle, speed of moving roadbed, angular velocity of the testing vehicle and drop height of the vehicle. Results show that numerical models of the JRS can be used to reconstruct real world rollover crashes using virtual testing, hence reducing the cost for carrying out physical tests.

关键词： JRS test, Virtual Modelling, Roof Intrusion, Resistance Force, Crashworthiness, Rollover

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Effect of special rotational deformation and grain size on fracture toughness of nanocrystalline solids containing a semi-elliptical blunt

Effect of special rotational deformation and grain size on f...

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13th International Conference on Fracture（ICF13）

作者： Min Yu Qihong Fang Hui Fen Youwen Liu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University College of Civil Engineering and Mechanics Central South University of Forestry and TechnologyChangsha 410004China

The paper established a grain size dependent theoretical model to investigate the combined effects of special rotational deformation and emission of edge dislocations from semi-elliptical blunt crack tip on the fracture toughness of nanocrystalline *** the model,the external stress concentration near the blunt crack tip leads to the special rotation

关键词： Effect of special rotational deformation and grain size on fracture toughness of nanocrystalline solids containing a semi-elliptical blunt

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Investigation of Adult Bicyclist Head Impact Conditions in vehicle-bicyclist Collision

Investigation of Adult Bicyclist Head Impact Conditions in V...

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The 10th Int. Forum of Automotive Traffic safety(INFATS)

作者： Yong Peng Yong Han Jikuang Yang Remy Willinger Department of Mechanical Engineering Xiamen University of Technology Institute of Fluid and Solid Mechanics University of Strasbourg State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Department of Applied Mechanics Chalmers University of Technology

The objective of the study is to investigate adult bicyclist head impact conditions in vehicle-bicyclist collision. For this purpose, the multi-body dynamic (MBD) models were used to simulate the head responses in vehicle-to-bicyclist collisions, in terms of head contact time, head impact point measured with Wrap Around Distance (WAD), head relative velocity and impact angle. A simulation matrix was established using three collision angles, two impact location, three bicyclist velocity (0 km/h, 10 km/h and 20 km/h) and four vehicle velocities (30 km/h, 40 km/h, 50 km/h and 60 km/h). The results indicate that the bicyclist head impact conditions are influenced by vehicle velocity, bicyclist velocity and initial bicyclist position. Head contact time is gradually decreasing with the increase of vehicle velocity or bicyclist velocity. The WAD value is gradually increasing with the increase of vehicle velocity, while the WAD value is gradually decreasing with the increase of bicyclist velocity. The head impact velocity is gradually increasing with the increase of vehicle velocity or collision angle. The head impact velocity is gradually decreasing with the increase of bicyclist velocity or collision angle. The conclusion from such a study can be used for developing guidelines to improve the safety of vulnerable road users and for conducting a conceptual investigation of regular test procedures for bicyclists' head protection.

关键词： Crash simulation, Collision angle, Bicyclist velocity, vehicle velocity, Head impact conditions

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The effect of battery temperature on total fuel consumption of fuel cell hybrid vehicles

The effect of battery temperature on total fuel consumption ...

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作者： Zheng, C.H. Kim, N.W. Park, Y.I. Lim, W.S. Cha, S.W. Xu, G.Q. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen University Town 1068 Xueyuan Avenue Shenzhen 518055 China Shenzhen Key Laboratory of Electric Vehicle Powertrain Platform and Safety Technology Shenzhen China School of Mechanical and Aerospace Engineering/SNU-IAMD Seoul National University Bldg. 301 #1505 San 56-1 Daehak-dong Gwanak-gu Seoul 151-742 Korea Republic of Department of Mechanical System Design Engineering Seoul National University of Science and Technology 172 Gongreung 2-dong Nowon-gu Seoul 139-743 Korea Republic of Department of Mechanical and Automotive Engineering Seoul National University of Science and Technology 172 Gongreung 2-dong Nowon-gu Seoul 139-743 Korea Republic of

In order to consider the effect of battery temperature on the total fuel consumption when a Pontryagin's Minimum Principle (PMP)-based power management strategy is applied to a fuel cell hybrid vehicle (FCHV), this paper designates the battery temperature as a second-state variable other than the battery state of charge (SOC) and defines a new costate for the battery temperature in the control problem. The PMP-based power management strategy is implemented in a computer simulation and the relationship among the final values of the two state variables and the total fuel consumption is illustrated based on the simulation results. This relationship is defined as an optimal surface in this research. Using the optimal surface, it can be concluded that considering the battery temperature effect in the PMP-based power management strategy improves the fuel economy of the FCHV. Potential fuel economy gains attributed to consideration of the battery temperature effect are also determined based on the optimal surfaces. Crown Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Fuel economy

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Optimization of bumper system for pedestrian lower leg protection from vehicle impact

Optimization of bumper system for pedestrian lower leg prote...

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2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Jiang, Kaitao Yang, Jikuang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China State Key Laboratory of Vehicle NVH and Safety Technology Chongqing China Department of Applied Mechanics Chalmers University of Technology Sweden

ISBN: (纸本)9780769547725

This paper aimed at improving a bumper system to meet the second phase EEVC (European Enhanced vehicle safety Committee) requirements for pedestrian lower leg protection. An approach is presented to optimize the front bumper system for minimizing the risk of pedestrian's lower leg injuries from the bumper impact. Firstly, a vehicle FE model was developed, a two-layer-material EA (Energy Absorber) and a lower stiffener were also developed to attach in the front bumper system. Then some structure parameters of the EA and the lower stiffener were selected and the design of experiment with orthogonal arrays was used to generate the test sample points. Finally, the multi-objective optimization of the structure parameters was conducted based on the NSGA-II (Non-dominated Sorting Algorithm). The maximum tibia acceleration, the maximum knee bending angle and the maximum shear displacement were chosen as the objective functions. The optimized results were used to redevelop the EA and the lower stiffener FE modals. The results of the study show that the performance of the vehicle for lower leg protection could be dramatically improved by the optimization of EA and lower stiffener and the second phase EEVC requirements for pedestrian lower leg protection can be satisfied. © 2012 IEEE.

关键词： Multiobjective optimization

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design of steering-by-wire system based on OSEKturbo real-time operation system

Design of steering-by-wire system based on OSEKturbo real-ti...

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2012 International Conference on Computer Science and Service System, CSSS 2012

作者： Chen, Xin Zhang, Guixiang State Key Laboratory of Advanced Design Manufacturing for Vehicle Body Hunan University Changsha Changsha Hunan China Hunan Institute of Humanities Science and Technology Loudi Hunan China College of Mechanical and Vehicle Engineering Hunan University Hunan China

ISBN: (纸本)9780769547190

This paper discusses the design of Steering-By-Wire (SBW) system based on OSEK turbo operation system. Firstly, OSEK/VDX, OSEK turbo and the structure of the SBW system are introduced. Then the paper mainly focuses on the software and hardware development for SBW system, especially the design of software framework using modular approach, the realization of Flex Ray communication and the configuration of OSEK implementation language based on OSEK turbo. It is proved that the design is feasible, which can improve the reusability and reliability of the codes and conduce to the extension of ECU functions. © 2012 IEEE.

关键词： Wire

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A study on pedestrian detection models based on real accident data from IVAC database in Changsha of China

A study on pedestrian detection models based on real acciden...

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2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Kong, Chunyu Nei, Jin Yang, Jikuang Research Center of Vehicle and Traffic Safety State Key Lab. of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha 410082 China State Key Laboratory of Vehicle NVH and Safety Technology Chongqing China Department of Applied Mechanics Chalmers University of Technology Sweden

ISBN: (纸本)9780769547725

This study aims to evaluate the probabilities of pedestrian detection within the response time of vehicle collision avoidance system of a car. For this purpose, the carpedestrian accident scenarios were analyzed using selected data from the IVAC accident database, in which the cases were collected from in depth investigations of the accidents in Changsha of China. The selection criteria were: (1) the accident occurred between 2001 and 2008;(2) the accident involved a passenger car, SUV, MPV or pick-up truck;(3) the pedestrian was not standing still before impact. Based on these criteria, 389 car-pedestrian cases were selected. The two most common scenarios (F1 and F2) were identified as the pedestrian crossing a straight road from the left (F1) or the right (F2) of the drivers. A mathematical model was developed with the frontal impact cases of F1 or F2 scenario. The following four parameters describing the configuration before the accident were studied: the trajectory and speed for both the car and the pedestrian. Considering the different half detective angles of the sensor system (15 degree, 30 degree, 45 degree), the probabilities of pedestrian detection were calculated. It was found that when the half detective angle was equal or larger than 30 degrees the sensor system could detect more than 94% of the pedestrians in both evaluated scenarios. © 2012 IEEE.

关键词： Pedestrian safety

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Dissipated energy measurements in high-cycle fatigue tests of metal material

Dissipated energy measurements in high-cycle fatigue tests o...

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13th International Conference on Fracture（ICF13）

作者： Yuan Li Franois Maquin Fabrice Pierron Xu Han Laboratoire de Mcanique et Procds de Fabrication(LMPF) Arts et Metiers ParisTechRue St DominiqueBP50851006 Chalons en Champagne CedexFrance Department of Traffic and Transportation Engineering College of Basic Education for Commanding OfficersNational University of Defense and TechnologyChangsha 410003China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan University

The dissipated behavior in high cycle fatigue of 316L stainless steel has been studied in this ***,dissipated energy per cycle could be deduced from temperature field of specimen surface using an refined experimental mechanical ***,dissipation energy variations were in-situ monitored during each high-cycle fatigue test under different stress

关键词： cycle Dissipated energy measurements in high-cycle fatigue tests of metal material

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