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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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The characteristics of rock mechanics and acoustic wave parameters of carbonate rock in the north-east Sichuan

The characteristics of rock mechanics and acoustic wave para...

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46th US Rock Mechanics / Geomechanics Symposium 2012

作者： Guo, Y.T. Yang, C.H. Mao, H.J. Chen, J.H. Luo, Y. State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Sinopec Research Institute of Petroleum Engineering Beijing China Key Lab. of Min. of Educ. for Exploitation of SW Resources and Environment Disaster Control Project Chongqing University Chongqing China

ISBN: (纸本)9781622765140

Carbonate reservoirs have a significant proportion of the known petroleum reserves, with its characteristics of pores and fractures development. A series of laboratory testing have been performed. Using high pressure water jet cutting the artificial crack (different angles and different lengths for dolostone & limestone), in order to simulate the natural fractures. We have measured P-wave velocity and S-wave velocity on carbonate rock for original specimens and artificial crack specimens. Results from laboratory research are as follows: 1) as the fractures exist, P-wave velocity and S-wave velocity decreased, the fracture has more influence on S-wave velocity than P-wave velocity;2) under uniaxial compression, the curves of axial strain and the compression velocity can be divided into three stages: 3) the fracture has an important influence on mechanical parameters of carbonate rock. Increasing fracture angle and length will result in decreasing the strength parameters under uniaxial compression;4) under condition of confining pressure, P-wave velocity increases with the increasing of confining pressure. The growth rate of dolostone's P-wave velocity is larger than limestone. The research results can be used for better analysis the mechanical and acoustic wave characteristics of carbonate rock in deep drilling engineering and provide technology parameters for exploration in carbonate reservoirs. Copyright 2012 ARMA, American Rock Mechanics Association.

关键词： Limestone

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Quasi-Green’s function method for free vibration of clamped thin plates on Winkler foundation

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Applied Mathematics and Mechanics(English Edition) 2011年第3期32卷 265-276页

作者：李善倾袁鸿 Institute of Applied Mechanics Key Laboratory of Disaster Forecast and Control in Engineering of Ministry of Education of ChinaJinan University

The quasi-Green＇s function method is used to solve the free vibration problem of clamped thin plates on the Winkler foundation. Quasi-Green＇s function is established by the fundamental solution and the boundary equation of the problem. The function satisfies the homogeneous boundary condition of tile problem. The mode-shape differential equation of the free vibration problem of clamped thin plates on the Winkler foundation is reduced to the Fredholm integral equation of the second kind by Green＇s formula. The irregularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The numerical results show the high accuracy of the proposed method.

关键词： Green＇s function integral equation clamped thin plate Winkler foundation,free vibration

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Line feature enhancement using a new shift-invariant non-aliasing ridgelet transform

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2012年 7145 LNCS卷 272-281页

作者： Yan, He Fu, Youjia Yin, Guangzhi Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education Chongqing 400044 China College of Computer Science Chongqing University of Technology Chongqing 400054 China

ISBN: (纸本)9783642290497

A new shift-invariant non-aliasing Ridgelet transform was presented to avoid aliasing and shift-variant in old Ridgelet transform. Firstly, image size was expanded twice via interpolating zero values,so that the sampling rate in Radon transform domain was improved and the aliasing was reduced;Secondly, the one-dimensional discrete wavelet transform in the old Ridgelet transform was replaced by one-dimensional dual-tree Complex wavelet transform(DCWT) which had both shift-invariant and double directional analysis ability. On this basis, a new image enhancement method for linear features was proposed by using zero-mean Gaussian mode in the shift-invariant non-aliasing Ridgelet transform domain. Experimental result shows that the presented Ridgelet transform can avoid effectively the 'scratch around'phenomenon in reconstructed image and the visual effects of the image enhancement is improved obviously. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Image enhancement

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