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Middle range wireless power transfer systems with multiple resonators

Journal of Central South University 2015年第6期22卷 2127-2136页

作者：陈新张桂香 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body (Hunan University) Department of Energy and Electrical Engineering Hunan University of Humanities Science and Technology

The equivalent two-port network model of a middle range wireless power transfer(WPT) system was presented based on strongly coupled multiple resonators. The key parameters of the WPT system include self-inductance, resistance, parasitic capacitance, mutual inductance and S-parameters of coils & resonators were analyzed. The impedance matching method was used to optimize load power and transmission efficiency of the multi-resonator WPT system, and the impedance matching method was realized through adjusting the distances between the coils and resonators. Experiments show that the impedance matching method can effectively improve load power and transmission efficiency for middle range wireless power transfer systems with multiple resonators, at distances up to 3 times the coil radius with efficiency more than 70% and load power also close to 3.5 W.

关键词： wireless power transfer middle range multiple resonators S-parameters two-port network impedance matching

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Improved Empirical Wavelet Transform Based Rotor Rubbing Fault Diagnosis

Improved Empirical Wavelet Transform Based Rotor Rubbing Fau...

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The 29th International Congress on Condition Monitoring and Diagnostic engineering Management

作者： Jinde Zheng Haiyang Pan Junsheng Cheng School of Mechanical Engineering Anhui University of Technology State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

ISBN: (纸本)9781510868434

Empirical wavelet transform(EWT) is a novel method for analyzing multi-component signal,which is proposed based on the classical wavelet *** fulfill an adaptive separation of Fourier spectrum in EWT,an improved EWT(IEWT) method is introduced in this *** IEWT includes two parts,*** adaptive segmentation of Fourier spectrum and the foundation of WT based filter *** the IEWT is compared with empirical mode decomposition(EMD) by analyzing the simulation signal,and the analysis results have demonstrated the effectiveness of the proposed ***,the proposed method is applied to fault diagnosis of rotor system with local rubbing and the analysis results of experiment data indicated that the proposed method could effectively fulfill rotor rubbing fault diagnosis and have a better result than the EMD method.

关键词： empirical mode decomposition empirical wavelet transform rotor rubbing

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Swarm Intelligence Algorithm Inspired by Route Choice Behavior

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Journal of Bionic engineering 2016年第4期13卷 669-678页

作者： Daxin Tian Junjie Hu Zhengguo Sheng Yunpeng Wang Jianming Ma Jian Wang Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing 100191 China School of Transportation Science and Engineering Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Beihang University Beijing 1 O0191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Nanjing 210096 China Department of Engineering and Design University of Sussex Brighton BN1 9RH UK The Texas Department of Transportation Austin TX78750 USA College of Computer Science and Technology Jilin University Changchun 130012 China

Travelers＇ route choice behavior, a dynamical learning process based on their own experience, traffic information, and influence of others, is a type of cooperation optimization and a constant day-to-day evolutionary process. Travelers adjust their route choices to choose the best route, minimizing travel time and distance, or maximizing expressway use. Because route choice behavior is based on human beings, the most intelligent animals in the world, this swarm behavior is expected to in- corporate more intelligence. Unlike existing research in route choice behavior, the influence of other travelers is considered for updating route choices on account of the reality, which makes the route choice behavior from individual to swarm. Anew swarm intelligence algorithm inspired by travelers＇ route choice behavior for solving mathematical optimization problems is introduced in this paper. A comparison of the results of experiments with those of the classical global Particle Swarm Optimization （PSO） algorithm demonstrates the efficacy of the Route Choice Behavior Algorithm （RCBA）. The novel algorithm provides a new approach to solving complex problems and new avenues for the study of route choice behavior.

关键词： swarm intelligence route choice behavior particle swarm optimization mathematical optimization

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Corrigendum to “Closed loop geometry based optimization by integrating subdivision, reanalysis and metaheuristic searching techniques” [Comput. Struct. 182 (2017) 459–474]

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Computers & Structures 2017年 187卷 122-122页

作者： Guanxin Huang Hu Wang Guoping Wang Guangyao Li Congyi Zhang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University China Joint Center for Intelligent New Energy Vehicle China Graphics & Interaction Laboratory EECS Department Peking University China Beijing Engineering Technology Center of Virtual Simulation and Visualization China

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Study on Material Parameters Identification of Brain Tissue Considering Uncertainty of Friction Coefficient

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IOP Conference Series: Materials Science and engineering 2017年第1期250卷

作者： Fengjiao Guan Guanjun Zhang Jie Liu Shujing Wang Xu Luo Feng Zhu Science and Technology on Integrated Logistics Support Laboratory National University of Defense Technology Changsha 410073 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China Department of Mechanical Engineering Embry-Riddle Aeronautical University Daytona Beach FL USA

Accurate material parameters are critical to construct the high biofidelity finite element (FE) models. However, it is hard to obtain the brain tissue parameters accurately because of the effects of irregular geometry and uncertain boundary conditions. Considering the complexity of material test and the uncertainty of friction coefficient, a computational inverse method for viscoelastic material parameters identification of brain tissue is presented based on the interval analysis method. Firstly, the intervals are used to quantify the friction coefficient in the boundary condition. And then the inverse problem of material parameters identification under uncertain friction coefficient is transformed into two types of deterministic inverse problem. Finally the intelligent optimization algorithm is used to solve the two types of deterministic inverse problems quickly and accurately, and the range of material parameters can be easily acquired with no need of a variety of samples. The efficiency and convergence of this method are demonstrated by the material parameters identification of thalamus. The proposed method provides a potential effective tool for building high biofidelity human finite element model in the study of traffic accident injury.

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Phase stability,elastic properties and electronic structures of Mg-Y intermetallics from first-principles calculations

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Journal of Magnesium and Alloys 2015年第2期3卷 127-133页

作者： J.Zhang C.Mao C.G.Long J.Chen K.Tang M.J.Zhang P.Peng Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle The Education Department of Hunan ProvinceChangsha University of Science and TechnologyChangsha 410114China Key Laboratory of Efficient and Clean Energy Utilization College of Hunan ProvinceChangsha University of Science and TechnologyChangsha 410114China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

The phase stability,elastic properties and electronic structures of three typical Mg-Y intermetallics including Mg_(24)Y_(5),Mg_(2)Y and MgY are systematically investigated using first-principles calculations based on density functional *** optimized structural parameters including lattice constants and atomic coordinates are in good agreement with experimental *** calculated cohesive energies and formation enthalpies show that either phase stability or alloying ability of the three intermetallics is gradually enhanced with increasing Y *** single-crystal elastic constants C_(ij) of Mg-Y intermetallics are also calculated,and the bulk modulus B,shear modulus G,Young's modulus E,Poisson ratio v and anisotropy factor A of polycrystalline materials are *** is suggested that the resistances to volume and shear deformation as well as the stiffness of the three intermetallics are raised with increasing Y ***,these intermetallics all exhibit ductile characteristics,and they are isotropic in compression but anisotropic to a certain degree in shear and ***,Mg_(24)Y_(5) presents a relatively higher ductility,while MgY has a relatively stronger anisotropy in shear and *** analysis of electronic structures indicates that the phase stability of Mg-Y intermetallics is closely related with their bonding electrons numbers below Fermi ***,the more bonding electrons number below Fermi level corresponds to the higher structural stability of Mg-Y intermetallics.

关键词： Magnesium alloys Intermetallics Phase stability Elastic properties Electronic structure

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Hysteresis characteristics modeling of the piezoelectric actuators

Hysteresis characteristics modeling of the piezoelectric act...

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International Conference on Manufacturing engineering and Intelligent Materials, ICMEIM 2015

作者： Qiang, C. E, J.Q. Deng, Y.W. Zhu, H. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China Hunan University College of Mechanical and Vehicle Engineering Changsha China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China Hunan University College of Mechanical and Vehicle Engineering Changsha China Institute of New Energy and Energy-Saving and Emission-Reduction Technology Hunan University Changsha China

ISBN: (纸本)9781138028326

To solve the problem of the hysteretic character of the piezoelectric material in real application, the initial weighted factors of the hysteretic units was calculated based on the theory of Preisach and the FORCs test data, then the combined method of RBF NN and FLS-SVM was introduced to calculate more weighted factors of the hysteretic units. Thus, the final model was established. The results of comparison between RBF result, FLS-SVM result, combined result and test result show that the combined model was better than any methods of RBF NN or FLS-SVM. So, the combined model is an effective method. © 2015 Taylor & Francis Group, London.

关键词： Piezoelectric actuators

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Crashworthiness optimization of thin-walled rail with different collision boundary conditions

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Open Mechanical engineering Journal 2015年第1期9卷 558-563页

作者： Wu, Hequan Cao, Libo Mao, Hongfeng State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle College of Hunan province Changsha University of Science and Technology Changsha China

As the world automotive crash safety regulations are different, it’s very important to design the energy absorbing structures that satisfy different collision boundary conditions. A large number of vehicle energy absorption beams dimensions were measured and then a common thin-walled rail was chosen. Considering the complexity of automobile collision boundary, finite element analysis and experimental design, interval uncertain algorithms, Kriging approximate model, NSGA - II genetic algorithm were combined to optimize the structure of the thin-walled rail with different impact velocity and different impact angle. Then the Pareto optimal solution was obtained. Thin walled beam after optimization has good energy absorption characteristics under different collision boundary conditions. Research results provide a method for the designing of a car that meets various crash regulations at the same time. © Gong et al.

关键词： Boundary conditions

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Research on the Method and Application for a vehicle's Online Diagnosis Based on a Testability Model 5

Research on the Method and Application for a Vehicle's Onlin...

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5th International Conference on Transportation engineering, ICTE 2015

作者： Song, Lijun Li, Yuan Zhang, Rui Wen, Xiaoyu Xu, Wei Department of Traffic and Transportation Engineering College of Basic Education National University of Defense Technology Changsha Yanwachi China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha Hunan China

ISBN: (数字)9780784479384

ISBN: (纸本)9780784479384

The study of online diagnosis based on testability models has been greatly concerned, due to the advantages of generality, real-Time performance, intuitive modeling and high efficiency. The paper presents a technique of the vehicle's online diagnosis based on testability models. Firstly, a basic algorithm is proposed, and a universal machine is designed for real-Time performance. To fulfill the demands of online application, a reasoning prototype is developed with the embedded platform of VxWorks. The experimental results prove the performance and effectiveness of the universal real-Time reasoning machine. Such a technique of online diagnosis can be applied to other equipments of traffic and transportation. © ASCE.

关键词： Testability Online diagnosis Reasoning machine VxWorks Testability OTHER EQUIPMENT Universal motors embedded platform vehicle

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A New Computational Method of the Friction Power Loss of Spiral Bevel Gears of a Helicopter Reducer 5

A New Computational Method of the Friction Power Loss of Spi...

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5th International Conference on Transportation engineering, ICTE 2015

作者： Li, Yuan Yuan, Jiehong Song, Lijun Mei, Guiming Zhang, Kunlun Lin, Zejin Department of Traffic and Transportation Engineering College of Basic Education National University of Defense Technology Changsha China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha Hunan China State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu China

ISBN: (数字)9780784479384

ISBN: (纸本)9780784479384

The objective of this paper is to develop a new computational method of friction power loss of the spiral bevel gears transmission system of the helicopter tail reducer. At first, the velocity and force of the meshing point were analyzed during meshing process. Then a computational model of friction power loss for spiral bevel gear was established based on the principle of meshing and tribology theory, considering the effects of actual contact ratio and time-variant factors. This model considered the effects of actual contact ratio and time-variant factors including mesh point relative sliding velocity of mesh point, normal load, friction coefficient, etc. © ASCE.

关键词： Computational method Friction power loss Spiral bevel gears spiral bevel gears computational methods power loss point of engagement contact ratio friction power BEVEL GEAR engaging

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