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4th International Conference on Natural Computation (ICNC 2008)

作者： Yu, Ling Wan, Zu-yong Jinan Univ Key Lab Disaster Forecast & Control Engn Minist Educ PR China Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9780769533049

The particle swarm optimization (PSO) algorithm with inertial weight is improved by adopting the sigmoid function and applied to structural damage identification in frame structures in this paper. The theoretical background on the improved PSO (IPSO) algorithm is introduced, a suite of four famous benchmark functions are then employed for evaluation on the IPSO performance. Some comparative studies on single and multi-damage of a 2-story rigid frame structure have been carried out. The illustrated results show that the IPSO algorithm can significantly improve the performance of the conventional PSO algorithm. IPSO can locate and identify structural damage with higher accuracy.

关键词： Damage detection

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Gas seepage equation of deep mined coal seams and its application

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Journal of China University of Mining and Technology 2008年第4期18卷 483-487页

作者： HU Guo-zhong WANG Hong-tu TAN Hai-xiang FAN Xiao-gang YUAN Zhi-gang Key Lab for Exploitation of China Southwestern Resources ＆ Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400030 China

In order to obtain a gas seepage law of deep mined coal seams, according to the properties of coalbed methane seepage in in-situ stress and geothermal temperature fields, the gas seepage equation of deep mined coal seams with the Klinkenberg effect was obtained by confirming the coatbed methane permeability in in-situ stress and geothermal temperature fields. Aimed at the condition in which the coal seams have or do not have an outcrop and outlet on the ground, the application of the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields on the gas pressure calculation of deep mined coal seams was investigated. The comparison between calculated and measured results indicates that the calculation method of gas pressure, based on the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields can accu- rately be identical with the measured values and theoretically perfect the calculation method of gas pressure of deep mined coal seams.

关键词： deep mining in-situ stress field geothermal temperature field gas seepage equation of coal seam gas pressure

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Theoretical model and numerical analysis on unsaturated expansive soil slope during digging and climate change courses (II)-numerical analysis

Theoretical model and numerical analysis on unsaturated expa...

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12th International Conference on Computer Methods and Advances in Geomechanics 2008

作者： Chen, Zheng-Han Lu, Zai-Hua Guo, Jianfeng Fang, Xiang-Wei Zhou, Hai-Qing Logistic Engineering University Chongqing China Key Lab. for the Exploitation of Southwest Resources Environment Disaster Control Engineering Ministry of Education Chongqing 1 China Navy University of Engineering Wuhan China

ISBN: (纸本)9781622761760

In order to investigate the sliding mechanism and process of expansive soil slope during digging and raining-evaporating courses, a FEM program named UESEPDC was designed based on the elasticity-plasticity-damage constitutive model and the elasticity-plasticity-damage consolidation model of unsaturated expansive soil proposed by the authors, and the numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages: Raining and evaporating before digging;The moment at digging finishing;Three days after digging finishing;Multi- raining-evaporating cycles. The fields of stress, displacement, pore water pressure, pore air pressure, water content and suction in an expansive soil slope were obtained, and the pictures of crack damage evolution and plastic zone development in the same expansive soil slope for each analysis stage were shown. The research results clearly reveal the mechanism of expansive soil slope sliding progressively.

关键词： Numerical analysis

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Analysis and numerical simulation of dynamic effect on rock under high pressure water jet

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Journal of Coal Science & engineering(China) 2008年第2期14卷 209-212页

作者：李晓红司鹄王丹丹 Key Lab.for the Exploration of Southwestern Resource & Environmental Disaster Control Engineering Ministry of EducationChongqing UniversityChongqing 400030China Department of Safety Engineering Chongqing UniversityChongqing 400030China

Based on continuum mechanics and rock dynamics,analyzed the micro-struc- ture damage of rock and the impulsive effect under high pressure water jet and developed the dynamic ***,on the assumption of that rock was homogeneous and iso- tropic,a computational model was established based on nonlinear finite element and Arbi- trary Lagrangian-Eulerian(ALE) *** dynamic effect impacted on rock under high pressure water jet was simulated by the dynamic contact *** propagation of stress wave in rock was numerically simulated at different impacting *** results show that the propagation velocity of stress wave is proportional to the impacting velocity of high pressure water *** faster the impacting velocity is,the quicker the comedown of stress wave.

关键词： high pressure waterjet impulsive dynamics stress wave nonlinear finite element

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A MOM-based algorithm for moving force identification: Part II - Experiment and comparative studies

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STRUCTURAL engineering AND MECHANICS 2008年第2期29卷 155-169页

作者： Yu, Ling Chan, Tommy H. T. Zhu, Jun-hua Queensland Univ Technol Sch Urban Dev Fac Built Environm & Engn Brisbane Qld 4001 Australia Hong Kong Polytech Univ Dept Civil & Struct Engn Hong Kong Hong Kong Peoples R China Jinan Univ Minist Educ Peoples Republ China Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Changjiang River Sci Res Inst Wuhan 430010 Peoples R China

A MOM-based algorithm (MOMA) has been developed for moving force identification from dynamic responses of bridge in the companion paper. This paper further evaluates and investigates the properties of the developed MOMA by experiment in laboratory. A simply supported bridge model and a few vehicle models were designed and constructed in laboratory. A series of experiments have then been conducted for moving force identification. The bending moment and acceleration responses at several measurement stations of the bridge model are simultaneously measured when the model vehicle moves across the bridge deck at different speeds. In order to compare with the existing time domain method (TDM), the best method for moving force identification to date, a carefully comparative study scheme was planned and conducted, which includes considering the effect of a few main parameters, such as basis function terms, mode number involved in the identification calculation, measurement stations, executive CPU time, Nyquist fraction of digital filter, and two different solutions to the ill-posed system equation of moving force identification. It was observed that the MOMA has many good properties same as the TDM, but its CPU execution time is just less than one tenth of the TDM, which indicates an achievement in which the MOMA can be used directly for real-time analysis of moving force identification in field.

关键词： moving force identification method of moments (MOM) bridge loads time domain method (TDM) dynamic responses

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A MOM-based algorithm for moving force identification: Part I - Theory and numerical simulation

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STRUCTURAL engineering AND MECHANICS 2008年第2期29卷 135-154页

The moving vehicle loads on a bridge deck is one of the most important live loads of bridges. They should be understood, monitored and controlled before the bridge design as well as when the bridge is open for traffic. A MOM-based algorithm (MOMA) is proposed for identifying the time-varying moving vehicle loads from the responses of bridge deck in this paper. It aims at an acceptable solution to the ill-conditioning problem that often exists in the inverse problem of moving force identification. The moving vehicle loads are described as a combination of whole basis functions, such as orthogonal Legendre polynomials or Fourier series, and further estimated by solving the new system equations developed with the basis functions. A number of responses have been combined, some numerical simulations on single axle, two axle and multiple-axle loads, being either constant or time-varying, have been carried out and compared with the existing time domain method (TDM) in this paper. The illustrated results show that the MOMA has higher identification accuracy and robust noise immunity as well as producing an acceptable solution to ill-conditioning cases to some extent when it is used to identify the moving force from bridge responses.

关键词： moving force identification method of moments (MOM) bridge-vehicle interaction time domain method legendre polynomials fourier series

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Effect of overlaid material on optical transmission of side-polished fiber made by wheel side polishing

Effect of overlaid material on optical transmission of side-...

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Asia-Pacific Optical Fiber Sensors Conference, APOS

作者： Zhe Chen Chunhe Bai Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China Guangzhou China Department of Optoelectronic Engineering Jinan University Guangzhou China

The performance of optical power transmission through a side polished fiber manufactured by wheel polishing method were investigated, in which materials of different refractive indices were overlaid on the polished surface. The experiments showed that the transmitted optical power through the side-polished fiber varied with the refractive index of the overlaid material. The result of our experiments fitted well the theoretical calculation. Side-polished fiber manufactured by wheel polishing method can not only be used to control optical power transmission through the fiber core but also be used as a refractive index sensor.

关键词： Optical materials Wheels Optical refraction Optical sensors Optical variables control Optical fiber sensors Power transmission Manufacturing Refractive index Optical control

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The Force Identification in Arch Using a Wavelet Deconvolution Method

The Force Identification in Arch Using a Wavelet Deconvoluti...

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International Conference on Experimental Mechanics 2008(ICEM 2008)(国际实验力学会议)

作者： Hongwei Ma Liangyan Cheng Zhenhua Song Zhenhua Nie College of Science & Engineering Jinan University Guangzhou China College of Science & Engineering Jinan University Guangzhou China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Jinan University Guangzhou China

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Experimental Investigation of Damage Detection in Arch Using Frequency Perturbation

Experimental Investigation of Damage Detection in Arch Using...

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International Conference on Experimental Mechanics 2008(ICEM 2008)(国际实验力学会议)

作者： Liangyan Cheng Zhenhua Song Jun Zhao Hongwei Ma College of Science & Engineering Jinan University Guangzhou China College of Science & Engineering Jinan University Guangzhou China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Jinan University Guangzhou China

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Slection of wavelet fuction on denoise qulities of ultrasonic inspection signal

Slection of wavelet fuction on denoise qulities of ultrasoni...

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SPAWDA Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

作者： Wei-wei Zhang Hong-wei Ma Zhi-hua Wang Department of Mechanics and Civil Engineering and The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Jinan University Guangdong China Institute of Applied Mechanics Taiyuan University of Technology Shaanxi China

It is suggested in this paper to denoise the ultrasonic inspection signals using wavelet transform. The theoretic base is that wavelet transform is a band-pass filter. Firstly, the frequencies of the inspection signal are evaluated according to the excited signal. Secondly, an appropriate scale for wavelet transform is computed following the laws between the scale and the frequency. Thirdly, wavelet transform with the scale would be operated. As results, the echoes by the flaws could be discerned in the wavelet coefficients. Finally, the propagation of the guided wave in a damaged pipe is simulated by code ANSYS and the signal processing are operated by code MATlab. The different wavelet functions are also discussed aiming at the denoised qualities. The signal-to-noise ratio (SNR) is used to evaluate the quality for different wavelet. It could be concluded that the Morlet wavelet is suitable to operate the ultrasonic inspection signal excited by a sinusoidal signal modulation by Hanning windows.

关键词： Inspection Wavelet transforms Frequency Civil engineering laboratories Technology forecasting control engineering education Educational technology Band pass filters Wavelet coefficients

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