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Effect of Multi-material Substitutions on Static and Dynamic Properties of Electric Vehicles

2nd International Conference on Advanced engineering Materials and Technology (AEMT)

作者： Yu, Lili Su, Zhenhua Lin, Jingzhan Yuan, Yusen Cui, Chunxiang Yu, Ling Hebei Univ Technol Sch Mat Sci & Engn Tianjin 300130 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Peoples R China

ISBN: (纸本)9783037854464

Automotive weight reduction is a challenging task due to many performance targets that must be satisfied simultaneously, in particular in terms of static and dynamic properties direct relating to strength, stiffness and NVH characteristics of vehicles. Compared to all-steel vehicle frame, multi-material substitutions are adopted in each structural component for higher product performance and a lightweight electric vehicle frame in this paper. The SHELL63 element is selected to construct finite element (FE) model of vehicle frame based on the FEA software ANSYS. Under full bending loading and torsional loading respectively, static analysis of frame is performed, and the strength and stiffness are evaluated as well. The Block Lanczos is adopted for dynamic analysis of vehicle frame. Their first eight modal properties are obtained and far away exciting frequency range of rough road. The multi-material vehicle frame has been designed to be made of mild steel, aluminum and magnesium alloys. Its static and dynamic properties show that the strength, stiffness and NVH characteristics are better than ones from all-steel vehicle frame with weight reduction of 31.7%. These procedures will help to design a lightweight and thus to provide technical support for reducing fuel consumption and greenhouse gas emissions.

关键词： Electric vehicle frame multi-material vehicle static analysis modal analysis NVH

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Ductile deformation mechanisms and designing instructions for integrated woven textile sandwich composites

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COMPOSITES SCIENCE AND TECHNOLOGY 2012年第12期72卷 1338-1343页

作者： Fan, Hualin Zhao, Long Chen, Hailong Kuang, Ning Yang, Chaokun Huang, Shiqing Jiang, Yifan Hohai Univ Coll Mech & Mat Lab Struct Anal Def Engn & Equipment Nanjing 210098 Jiangsu Peoples R China Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China PIA Univ Sci & Technol Nanjing 210007 Jiangsu Peoples R China Sinoma Sci & Technol Co Ltd Nanjing Fiberglass Res & Design Inst Nanjing 210012 Jiangsu Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

To suggest designing instructions for integrated woven textile sandwich composites (IWTSCs), anti-crush properties of IWTSC and the corresponding ductile deformation mechanism were investigated. Quasi-static out-of-plane crushing and dynamic impact tests were carried out. Typical deformation curves with a relative stable deformation plateau were obtained from tests. Failure of IWTSC is ductile through coupled compression-shear deformation. An analytical plastic model was proposed to explain ductile mechanism of IWTSC qualitatively, including densification caused by interactions among inclined piles. Combining with qualitative analysis, comparisons between two kinds of IWTSC panels with piles of different density and thickness reveal the key to design a ductile IWTSC. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Textile composites Mechanical properties Stress/strain curves Deformation Modelling

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An eigenspace projection clustering method for structural damage detection

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STRUCTURAL engineering AND MECHANICS 2012年第2期44卷 179-196页

作者： Zhu, Jun-hua Yu, Ling Yu, Li-li Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China China Elect Prod Reliabil & Environm Testing Res Guangzhou 510610 Guangdong Peoples R China Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Hebei Univ Technol Sch Mat Sci & Engn Tianjin 300130 Peoples R China

An eigenspace projection clustering method is proposed for structural damage detection by combining projection algorithm and fuzzy clustering technique. The integrated procedure includes data selection, data normalization, projection, damage feature extraction, and clustering algorithm to structural damage assessment. The frequency response functions (FRFs) of the healthy and the damaged structure are used as initial data, median values of the projections are considered as damage features, and the fuzzy c-means (FCM) algorithm are used to categorize these features. The performance of the proposed method has been validated using a three-story frame structure built and tested by Los Alamos National laboratory, USA. Two projection algorithms, namely principal component analysis (PCA) and kernel principal component analysis (KPCA), are compared for better extraction of damage features, further six kinds of distances adopted in FCM process are studied and discussed. The illustrated results reveal that the distance selection depends on the distribution of features. For the optimal choice of projections, it is recommended that the Cosine distance is used for the PCA while the Seuclidean distance and the Cityblock distance suitably used for the KPCA. The PCA method is recommended when a large amount of data need to be processed due to its higher correct decisions and less computational costs.

关键词： structural damage detection eigenspace projections fuzzy clustering principal component analysis kernel principal component analysis

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Study on safety assessment of gas station based on fuzzy theory

Study on safety assessment of gas station based on fuzzy the...

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2nd International Conference of Electrical and Electronics engineering, ICEEE 2011

作者： Jing-Cheng, Liu Hong-Tu, Wang Wen-Hua, Li Shun-Peng, Zeng Yu, Ma Chongqing University Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing China Chongqing University of Science and Technology Institute of Oil and Gas Engineering Chongqing China

ISBN: (纸本)9783642260063

Gas Station safety is non-linear systems that refer to many factors and multilayer. There are much flammable and explosive compressed natural gas in gas station, and it is considered as a kind of major hazard source. Therefore, the safety assessment of gas station has their special important and realistic significance. Based on the types of accident and risk factors, a new index system of safety assessment was set up. The weight of the evaluation index would be analyzed by analytic hierarchy process, and then the matrix of evaluating results could be calculated through fuzzy comprehensive evaluation. At last, the grade of safety for gas station could be obtained. This Safety Assessment Model can be applied for every gas station. © 2012 Springer-Verlag.

关键词： Safety engineering

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TIME SERIES BASED STRUCTURAL NONLINEAR DAMAGE IDENTIFICATION ALGORITHM USING ARMA/GARCH MODEL

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12th International Symposium on Structural engineering (ISSE-12)

作者： Chen, Liujie Yu, Ling Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Sun Yat Sen Univ Sch Engn Guangzhou 510006 Guangdong Peoples R China

ISBN: (纸本)9787030357878

A new algorithm for nonlinear damage detection is proposed based on a model of autoregressive moving average with generalized autoregressive conditional heteroscedasticity (ARMA/GARCH) in this paper. First, the reference ARMA model is constructed with the acceleration responses measured in reference (healthy) state. One-step-ahead error predictions are then modeled as GARCH models. Secondly, the new nonlinear damage-sensitive feature (DSF) is defined as the GARCH model conditional standard deviation of ARMA model residual error in the reference and unknown states, respectively. The performance of the presented algorithm is evaluated and verified by the experimental data of a three-story building structure provided by Los Alamos National laboratory (LANL) USA. Finally, the new algorithm is compared with the traditional methods based on the standard deviation ratio of the residual error of ARMA model. The illustrated results show that the proposed method can effectively estimate the extent of nonlinear damage with a higher accuracy, less computational cost and more robustness against operational and environmental variety. This makes the proposed algorithm applicable for structural health monitoring in situ.

关键词： Structural health monitoring nonlinear damage detection time series analysis ARMA/GARCH model

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Study on fractal-like dissociation kinetic of methane hydrate and environment effect

Study on fractal-like dissociation kinetic of methane hydrat...

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2nd International Conference of Electrical and Electronics engineering, ICEEE 2011

作者： Feng, Xu Qiang, Wu Lihua, Zhu Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education Chongqing University Chongqing China School of Safety Engineering and Technology Heilongjiang Institute of Science and Technology Harbin China

ISBN: (纸本)9783642260063

By using observation method, the dissociation process of methane hydrate at normal temperature and pressure is studied, and it is discovered which the dissociation of methane hydrate isn't occurred synchronously at whole surface, but heterogeneous characteristic of dissociation is emerged. The dissociation rate of hydrate is slow at normal temperature and pressure, and average dissociation rate is 2.15x10-4m3·h-1. The dissociation kinetic equation of methane hydrate is proposed. It is revealed that the dissociation of methane hydrate at normal pressure is a pseudo first-order reaction. The dissociation rate coefficient of methane hydrate in different time is calculated, and the result shows that the rate coefficient is relative to reaction time, namely the dissociation kinetics of methane hydrate does not tally with the typical kinetics law, and the dissociation reaction kinetics of methane hydrate is fractal-like. Lastly, the environment effent of hydrate dissociation is also analyzed. © 2012 Springer-Verlag.

关键词： Hydration

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A Perturbation Procedure for Limit Cycle and Heteroclinic Connection Analysis of Certain Self-Excited Oscillator

A Perturbation Procedure for Limit Cycle and Heteroclinic Co...

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International Conference on Civil, Architectural and Hydraulic engineering (ICCAHE 2012)

作者： Chen, Yangyang Zhao, Wei Yan, Lewei Guangzhou Univ Earthquake Engn Res & Test Ctr Guangzhou 510405 Guangdong Peoples R China Jinan Univ Key Lab Disaster Forecast & Control Engn Minist Educ China Guangzhou 510632 Guangdong Peoples R China Guangzhou Univ Dept Engn Mech Guangzhou 510405 Guangdong Peoples R China

ISBN: (纸本)9783037854846

A perturbation procedure, in which the elliptic perturbation method and the hyperbolic perturbation method are applied, is presented for predicting heteroclinic connection of limit cycle or self-excited ocsillator. The limit cycle can be analytically constructed first by the elliptic perturbation method after Hopf bifurcation, in which the amplitude of limit cycle can be controlled by the modulus of elliptic functions. The heteroclinic trajectories, which are formed by the heteroclinic connection of limit cycle, can also be constructed by similar perturbation procedure but adopting the hyperbolic functions instead of elliptic functions. And the criterion of heteroclinic connection is given in the perturbation procedure. A typical self-excited oscillator is studied in detail to assess the present method.

关键词： Heteroclinic Connection Limit Cycle Elliptic Perturbation Method Hyperbolic Perturbation Method

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An ARMA/GARCH based approach for structural damage detection

An ARMA/GARCH based approach for structural damage detection

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23rd International Congress of Theoretical and Applied Mechanics

作者： Ling Yu Cong Cheng Liujie Chen Department of Mechanics and Civil Engineering Jinan University MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Department of Applied Mechanics and Engineering Sun Yat-Sen University

＜正＞A novel approach is proposed for structural nonlinear damage detection based on the autoregressive moving average and generalized autoregressive conditional heteroscedasticity （ARMA/GARCH） model in this *** re...

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forecast model for inner corrosion rate of oil pipeline based on PSO-SVM

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International Journal of Simulation and Process Modelling 2012年第1-2期7卷 74-80页

作者： Liu, Jingcheng Wang, Hongtu Yuan, Zhigang Key Lab for Exploitation of China Southwestern Resources Environmental Disaster Control Engineering Chongqing University Chongqing 401331 China

In order to improve the prediction precision of inner corrosion rate of oil pipeline, this paper proposes a novel forecast model, which combines the superior regression performance of a support vector machine and the global optimisation ability of particle swarm optimisation. The SVM regression model, with radial basis function (RBF) kernel, is established to facilitate the inner corrosion rate of oil pipeline;and the global optimiser, PSO is employed to optimise the SVM parameters needed in SVM regression. The proposed model can reduce the dimensionality of data space and preserve features of inner corrosion rate of oil pipeline. The proposed PSO-SVM model, compared with BP neural network model, had higher accuracy and speed and the maximum error is 0.6%. Thus, it provides a new method for the forecast of inner corrosion rate of oil pipeline. Copyright © 2012 Inderscience Enterprises Ltd.

关键词： Support vector machines

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Out-of-plane Compression and Impact of Woven Textile Sandwich Composites

Out-of-plane Compression and Impact of Woven Textile Sandwic...

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第三届数字制造与自动化国际会议

作者： Long ZHAO Hualin FAN Shiqing HUANG PLA University of Science and Technology Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University State Key Laboratory of Automotive Safety and Energy Tsinghua University MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University

Woven textile sandwich composite （WTSC） is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies.

关键词： woven textile sandwich composite out-of-plane compression low-velocity impact

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