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2012 International Conference on Mechatronic Systems and Automation Systems, MSAS 2012

作者： Chen, Yangyang Yan, Lewei Zhao, Wei State Key Laboratory Cultivation Base of Vibration Control and Structural Safety Guangzhou University Guangzhou 510405 China Department of Engineering Mechanics Guangzhou University Guangzhou 510405 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783037854921

The comparison of the hyperbolic perturbation method and the hyperbolic Lindstedt-Poincaré method for homoclinic solutions of self-excited systems is studied in this paper. The homoclinic solution of a generalized Van del Pol system with strongly quadratic nonlinearity is analytically derived by both of the methods. The critical value of the bifurcation parameter under which homoclinic trajectory forms can be determined by the both of the perturbation procedures. Typical numerical examples are studied in detail and compared to illustrate the accuracy and the efficiency. © (2012) Trans Tech Publications, Switzerland.

关键词： Perturbation techniques

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

作者： Zhao, Long Fan, Hualin Huang, Shiqing PLA University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Lab. of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9780769547725

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. © 2012 IEEE.

关键词： Honeycomb structures

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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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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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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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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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International Conference on Digital Manufacturing & Automation

作者： Long ZHAO Hualin FAN Shiqing HUANG People's Liberation Army University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University HHU Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

关键词： Woven textile sandwich composite Out-of-plane compression Low-velocity impact

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Structural health monitoring based on continuous ACO method

Structural health monitoring based on continuous ACO method

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作者： Yu, Ling Xu, Peng MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Department of Civil Engineering China Three Gorges University Yichang 443002 China

Structural damage detection remains as a challenging task in the field of structural health monitoring (SHM), which has occupied many scientific communities over the last two decades. As a new exploring attempt to the SHM problem, this paper proposes an ant colony optimization (ACO) based algorithm for continuous optimization problems on structural damage detection in the SHM field. First of all, the theoretical background of ACO is introduced for search of approximation best solution to discrete optimization problems and further to continuous optimization problems. Then four benchmark functions are used to evaluate the performance of continuous ACO (CnACO) algorithm. After that, the problem on the structural damage detection is mathematically converted into a constrained optimization problem, which is then hopefully solved by the CnACO algorithm. Meanwhile, effect of measurement noise on the algorithm is considered in all the damage scenarios. Upon extensive numerical simulations for single and multiple damages of a 2-storey rigid frame structure, the proposed method is extended to four damage patterns of a building model of 3-storey steel frame structure made in laboratory for further experimental verification of the proposed method. Illustrated results show that the proposed method is very effective for the structural damage detection. Regardless of weak damage or multiple damages, the identification accuracy is very high and the noise immunity is better, which shows that the proposed method is feasible and effective in the SHM field. © 2010 Elsevier Ltd. All rights reserved.

关键词： Ant colony optimization

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Green Quasifunction Method for Bending Problem of Clamped Orthotropic Trapezoidal Thin Plates on Winkler Foundation

Green Quasifunction Method for Bending Problem of Clamped Or...

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The 2nd International Conference on Applied Mechanics and Mechanical engineering(ICAMME 2011)

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University

ISBN: (纸本)9783037852965

The Green quasifunction method(GQM) is applied to solve the bending problem of clamped orthotropic thin plates with trapezoidal boundary shape on Winkler foundation. Firstly the governing differential equation of the problem is reduced to the boundary value problem of the biharmonic operator, and then it is reduced to the Fredholm integral equation of the second kind by Green's formula. A Green quasifunction is established by using the fundamental solution and the boundary equation of the problem. This function satisfies the homogeneous boundary condition of the problem. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with ANSYS finite element solution shows good agreement. The proposed method is a novel and effective mathematical one.

关键词： Green's function integral equation R-function Winkler foundation bending of orthotropic plate

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Dynamic Response and Crack Detection of Multi-span Simple Beam under Moving Loads

Dynamic Response and Crack Detection of Multi-span Simple Be...

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第四届国际机械工程与力学会议

作者： Jun ZHAO Zhenhua NIE Hongwei MA College of Science & Engineering Jinan University The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China

This paper is to show the potential of the crack detection method based on Multi-resolution Analysis(MRA) of wavelet, which depends on the response of a single point on multi-span beam with concentrated moving loads. When moving along the structure, the moving loads cause small distortions in the dynamic response of the beam-like structure at the crack locations. In general, these small distortions are difficult to detect visually. An ANSYS model of a cracked multi-span beam is established. The moving loads are modeled by shifting the point of the concentrated force. The response at mid-span of 3-span beam is calculated with Wavelet Multi-Resolution Analysis (MRA) method, and the cracks on the multi-span beams can be identified by the position of peaks of the coefficient curves. Furthermore, with the superposition principle, the key parameter of dynamic response of the multi-span beams can be identified. Finally, The effects of results with multiple cracks location and appropriate wavelets are discussed in detail. The proposed method is applicable for low velocity-movements while high velocity-movements are not recommended.

关键词： Moving loads, Crack detection, Multi-span beam, Multi-resolution Analysis of Wavelet

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Parametric Effect on Bidirectional Moving Vehicle Load Identification

Parametric Effect on Bidirectional Moving Vehicle Load Ident...

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The 2011 International Conference on Mechanical Materials and Manufacturing engineering(ICMMME 2011)

作者： Ling Yu Xuegang Wang Department of Civil Engineering China Three Gorges University Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of ChinaJinan University

Parametric effect on bidirectional moving vehicle load identification from plate bridge responses is studied in this *** equation of motion of a plate bridge-bidirectional vehicle system is formulated based on Hamilton principle and is rewritten in a state space form,the bidirectional moving load identification problem is considered as a damped least-squares problem and further solved with the regularization ***,the effect of parameters on identification accuracy is investigated in order to evaluate the effectiveness and robustness of the bidirectional moving load identification method proposed in a companion *** numerical simulations show that the proposed method is correct and effective for identifying the bidirectional moving vehicle loads from bridge responses with an acceptable accuracy,but the selection of parameters should be carefully considered in the identification process.

关键词： Time domain method,moving force identification,vehicle loads,bridge loads

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