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2014 International Conference on Materials Science and engineering technology, MSET 2014

作者： Tao, Chen Yun, Peng State Key Laboratory of Vehicle NVH and Safety Technology Chongqing China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China

ISBN: (纸本)9783038351023

In the process of side impact, the door was directly contacted with the chest, abdomen and pelvis of dummy and its movement has a large effect upon dummy injury. A evaluation about dummy injury influenced by the velocity and displacement of chest, abdomen and pelvis in dummy was proposed. A rapid forward development strategy which is applied in forward development was presented. A new type side impact LPM (Lumped-Parameter Model) was established. The stiffness of critical area in vehicle body was optimized by LPM which used the intrusive velocity and displacement of chest, abdomen and pelvis in dummy as design object. The example showed that the safety performance was improved obviously and the development period was shortened in some extent. © (2014) Trans Tech Publications, Switzerland.

关键词： safety engineering

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Influence and mechanism of local lattice deformation induced by dopants on the dehydrogenation thermodynamics of MgH2 20

Influence and mechanism of local lattice deformation induced...

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20th World Hydrogen Energy Conference, WHEC 2014

作者： Zhang, J. Education Department of Hunan Province Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China

Using first-principles calculations in combination with experimental study, the doping effect of transition metals such as Ti or Ni on the dehydrogenation thermodynamics of MgH2 hydride were investigated, and a new catalytic mechanism was proposed. The results show that the incorporation of either Ti or Ni decreases the hydrogen desorption enthalpy and dehydrogenation temperature. Comparatively, the doping effect of Ni element is more remarkable. The local lattice deformation or distortion induced by dopants was considered to be the essential reason for the improved dehydrogenation thermodynamics of doped MgH2, which provides a new catalytic mechanism for the doping of transition metals. Analysis of electronic structures suggests the dehydrogenation thermodynamics of doped MgH2 are closely associated with the energy gap near Fermi level as well as the bonding characteristics of MH (M=Mg, Ti, Ni) within lattice. Namely, the narrower energy gap as well as the more obvious covalent bonding characteristics of M-H corresponds to the more excellent dehydrogenation thermodynamics. Copyright © (2014) by the Committee of WHEC2014 All rights reserved.

关键词： Thermodynamics

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Functional link neural network prediction on composite regeneration time of diesel particulate filter for vehicle based on fuzzy adaptive variable weight algorithm

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Journal of Information and Computational Science 2014年第6期11卷 1741-1752页

作者： Zuo, Qingsong E, Jiaqiang Gong, Jinke Li, Lijun Chen, Tao Wang, Shuhui Jia, Guohai State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 China College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China College of Mechanical and Electrical Engineering Central South University of Forestry and Technology Changsha 410004 China

In order to enhance the precision of prediction on composite regeneration time of diesel particulate filter for vehicle, different predictive values of each prediction model are selected as the primeval input values of functional link neural network, and the functional link neural network prediction model of composite regeneration time based on fuzzy adaptive variable weight algorithm is established after the necessary and sufficient conditions for fitting of functional link neural network are analyzed. The application result of the model shows that the absolute value |emax| of maximum relative error of functional link neural network prediction model on composite regeneration time of diesel particulate filter for vehicle based on fuzzy adaptive variable weight algorithm is less than 0.86%, indicating the high accuracy of the prediction model. Moreover, the result draws that the factors influencing composite regeneration time prediction of diesel particulate filter for vehicle, influence degree of which is from big to small, are exhaust oxygen concentration, exhaust mass flow, microwave power, exhaust temperature and the amount of cerium-based additive. © 2014 Binary Information Press.

关键词： vehicles

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Modeling of the flow stress behavior and microstructural evolution during hot deformation of Mg-8Al-1.5Ca-0.2Sr magnesium alloy

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Journal of Magnesium and Alloys 2014年第2期2卷 133-139页

作者： Xiao Liu Luoxing Li Biwu Zhu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082HunanChina College of Mechanical and Electrical Engineering Hunan University Science and TechnologyXiangtan 411002HunanChina

Hot compression tests of Mg-8Al-1.5Ca-0.2Sr magnesium alloy were performed on the Gleeble-1500 machine at temperatures of 300,350,400,and 450℃and strain rates of 0.01,0.1 and 1 s^(−1).The flow stress behavior and microstructural evolution were *** work hardening was derived according to the Laasraoui-Jonas *** improved approach,which considered the influence of yield stress on flow stress and the effect of grain boundary(GB)migration on the evolution of dislocation density during compression,was used to simulate the microstructural evolution,the flow stress and the volume fraction recrystallized of Mg-8Al-1.5Ca-0.2Sr magnesium *** simulated results are in good agreement with experimental results.

关键词： Magnesium alloy Work hardening Cellular automata Volume fraction recrystallized Microstructure

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A parameter inverse-solve algorithm for dynamic characteristics of absorbed energy components

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Energy Education Science and technology Part A: Energy Science and Research 2014年第6期32卷 4887-4896页

作者： Tang, Youming Cao, Libo Kan, Steven Xiamen University of Technology School of Mechanical and Automotive Engineering Fujian China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan China The George Washington University National Crash Analysis Center Virginia United States

In order to get the nonlinear rigidity of spring and damping of parameter lumped model (PLM), one numerical methodology was developed, which was entitled parameter inverse-solve method (PIM). The method is that using piecewise parameter approximation to fit the test data of side impact conducted by regulations of China New Car Assessment Program (China-NCAP), and combining with nonlinear dynamic system equations, to inverse-solve the dynamic characteristics of absorbed energy components of passenger vehicle and the structure of test dummy in side impact. Comparatively analyzed the results of test method and finite element method, the results was given by PIM, could gain the nonlinear responds of vehicle parts and dummy in side impact. © Sila Science. All rights reserved.

关键词： Nonlinear equations

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Optimizing RSUs Network against Cascading Failure

Optimizing RSUs Network against Cascading Failure

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing, UIC-ATC

作者： Wenzhong Tang Xiongyu Shan Daxin Tian Zhengguo Sheng Haiying Xia Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Beihang University Beijing China The Ministry of Public Security of China ITS Technology Optimization and Integration Hefei China Department of Engineering and Design The University of Sussex Richmond UK Research Institute of Highway Ministry Transport Beijing China

ISBN: (纸本)9781467372121

Nowadays, with the development of the vehicular ad hoc network, the reliability and stability of the communication network between RSUs has become a critical issue. So in the case of cascading failure, what topological structure can generate a relatively robust network with a relatively low cost? In this paper, we take advantage of a cascading failure model to simulate the cascading failure process of the network, at the same time, we make use of an evolution algorithm to evolve the network. Thus can obtain the network with relatively best comprehensive properties. Then take advantage of the statistical characteristics to analyze the topological structure of the network. The analysis shows that, the high clustering, high assortativity and the relatively large average shortest path length are all beneficial to improve the comprehensive properties of the network, while the network with good comprehensive properties also has a relatively homogeneous degree distribution.

关键词： Power system faults Power system protection Complex networks Communication networks vehicles Vehicular ad hoc networks Load modeling

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Dynamic analysis of spiral bevel gear pair under time-varying backlash

Dynamic analysis of spiral bevel gear pair under time-varyin...

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4th International Conference on Machinery, Materials Science and engineering Applications, MMSE 2014

作者： Qiu, Huan Song Yuan, Jie Hong Li, Yuan Li, Xing College of Basic Education National University of Defense Technology Changsha 410073 China State Key Laboratory of Advanced Design and Manufacturing Vehicle Bodyv College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China

ISBN: (纸本)9783038351139

Neglecting the influence of static transmission error, a non-linear dynamic model of spiral bevel gear pair with time-varying backlash was presented. Through the simplification of above model, the dimensionless form of gear system was obtained. Then, the dynamic characteristics of gear system were acquired by using Runge-Kutta method under the influence of time-varying backlash and torque. The results showed primary harmonic amplitude of gear backlash and torque had a significant effect on the non-linear and vibration characteristics of gear system. With the change of that, bifurcation phenomenon, quasi periodic motion and chaotic motion were detected. In addition, the variation and fluctuation of amplitude, containing displacement amplitude and velocity amplitude, were analyzed detailedly. © (2014) Trans Tech Publications, Switzerland.

关键词： Runge Kutta methods

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Application of the Lumped-parameter Model in concept design phase of Side Impact safety Development

Application of the Lumped-parameter Model in concept design ...

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The 2014 International Conference on Materials Science and engineering technology(MSET 2014)

作者： Chen Tao Peng Yun State Key Laboratory of Vehicle NVH and Safety Technology State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

ISBN: (纸本)9783038351023

In the process of side impact, the door was directly contacted with the chest, abdomen and pelvis of dummy and its movement has a large effect upon dummy injuryA evaluation about dummy injury influenced by the velocity and displacement of chest, abdomen and pelvis in dummy was proposedA rapid forward development strategy which is applied in forward development was presentedA new type side impact LPM(Lumped-Parameter Model) was establishedThe stiffness of critical area in vehicle body was optimized by LPM which used the intrusive velocity and displacement of chest, abdomen and pelvis in dummy as design objectThe example showed that the safety performance was improved obviously and the development period was shortened in some extent.

关键词： the lumped-parameter model side impact concept design phase optimization

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The effect of stress wave on dynamic response of square thin-walled tube

The effect of stress wave on dynamic response of square thin...

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2014 International Conference on Applied Mechanics and Mechanical Automation, AMMA 2014

作者： Tan, Zhu-Hua Zhang, Bo Zhai, Peng-Cheng Department of engineering structure and mechanic School of Science Wuhan University of Technology Wuhan 430070 China State key laboratory of advanced design and manufacturing for vehicle body Hunan University Changsha 410082 China

ISBN: (纸本)9783038351511

The effect of stress wave propagation on dynamic response of square tube was investigated by the experimental and numerical simulation methods in the present paper. The square tubes were subjected to the axial impact by split Hopkinson pressure bar. And the deformation process of each square tube was recorded by a high speed camera. Typical dynamic plastic buckling phenomena were observed in the experiments. And the numerical calculation of the experimental load case was conducted to analyze the effect of the stress wave propagation on the initial buckling of the square tube. The results show that there is obvious stress wave propagation in the square tube before the buckling of the square tube. And the initial buckling starts from the rear end of the tube due to the propagation of the stress wave. The relation between the stress wave propagation and initial buckling of the square tube was also discussed. © (2014) Trans Tech Publications, Switzerland.

关键词： Dynamic response

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Physical mechanism of the compressive response of F-actin networks:significance of crosslinker unbinding events

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Theoretical & Applied Mechanics Letters 2014年第5期4卷 37-43页

作者： Tong Li Dean Hu Prasad K.D.V.Yarlagadda Yuantong Gu School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

A model of crosslinker unbinding is implemented in a highly coarse- grained granular model of F-actin cytoskeleton. We employ this specific granular model to study the mechanisms of the compressive responses of F-actin networks. It is found that the compressive response of F-actin cytoskeleton has dependency on the strain rate. The evolution of deformation energy in the network indicates that crosslinker unbinding events can induce the remodelling of F-actin cytoskele- ton in response to external loadings. The internal stress in F-actin cytoskeleton can efficiently dissipate with the help of crosslinker unbinding, which could lead to the soontaneous relaxation of living cells.

关键词： F-actin cytoskeleton coarse-grained crosslinker unbinding compressive re-sponse

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