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作者： Sun, Xiaoyun Cheng, Jiulong Lv, Dandan Liu, Donghui School of Electrical and Electronics Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education Chongqing 400044 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China School of Electrical Engineering and Information Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9789078677383

The basic concept and the fusion reasoning method of Dempster-Shafer evidential theory are introduced in this paper, by which the basic probability assignment testing the rock bolt is gained. The tested signal with different exciting frequencies is decomposed by HHT method, coefficients in useful signal dominative layer are used to be data fusion signal, and the Dempster-Shafer evidential theory is used to solve the rock bolt inspection problem. The result shows the effectiveness of Dempster-Shafer evidential theory method. © Atlantis Press, 2010.

关键词： Rock mechanics

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Analysis of solid-fluid coupling for tunnel excavation in complicated fractured rock masses

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Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental engineering 2010年第2期32卷 35-39+52页

作者： Zhao, Yu Lu, Yi-Yu Huang, Cheng Kang, Yong College of Civil Engineering Chongqing University Chongqing 400044 China Key Lab. for the Exploitation of Southwestern Resources and Environmental Disaster Control Eng. Chongqing University Chongqing 400044 China Key Laboratory of Rock and Soil Mechanics Institute of Rock and Soil Mechanics Chinese Acad. of Sci. Wuhan 430071 China

When tunnels are through water-bearing section of fractured rock mass, a complex interaction process between rock mass deformation and fluid transportation is one of the most important reasons for water gushing, water bursting and mud bursting. To study the rock mass deformation and fluid transportation in tunnel excavation under complex geological conditions, a hydraulic model of complex crack rock mass was established from the relationship between the crack growth degree of surrounding rock in deep buried tunnel and the engineering scale, with which fracture network of different levels in rock mass could be considered simultaneously. Furthermore, a computer Fortran program was put forward to simulate the solid-fluid coupling of excavation process of a deep buried tunnel. And it was found that the principal fractures had strong flowing action and network fractures had storage function and lag effect in seepage area. And the yield area of surrounding rock was increased under the coupling of seepage field and stress field.

关键词： Fracture

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Qualitative Determination of the Components of Textile Products Using near Infrared Spectroscopy

Qualitative Determination of the Components of Textile Produ...

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Photonics and Optoelectronics, SOPO

作者： Dongmin Wang Furong Huang HuaCai Chen Shangzhong Jin Xingdan Chen Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China Department of Optoelectronic Engineering Jinan University Guangzhou China College of Optical and Electronic Technology China Jiliang University Hangzhou China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy and Sciences Changchun China

In the paper, A total of 40 pure or two-mixed textile weaves were prepared and classification of these samples was introduced using near infrared spectroscopy (NIRS), all textile samples are selected among four classes, which are Cotton-Terylene, Cotton-Polyurethane, Cotton and Terylene, according to theirs components. Near infrared diffuse reflectance spectra of the samples were collected, Mahalanobis distance was used to discriminate the samples coupled with principle components analysis (PCA), the results showed that near infrared spectroscopy could determine which class one textile weave belongs to easily comparing with traditional methods. In addition, the expectation of the further research on qualitative determination of textile products by NIR technology was discussed in the end of this paper.

关键词： Textile products Infrared spectra Optical fiber devices Optical devices Textile technology Chemical industry laboratories Cotton Principal component analysis Spectroscopy

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Studies on wavelet packet-based crack detection for a beam under the moving load

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key engineering Materials 2009年 413-414卷 285-290页

作者： Weiwei, Zhang Zhihua, Wang Hongwei, Ma College of Science and Engineering Jinan University Guangzhou 510632 China The Key Lab of Disaster Forecast and Control in Engineering Ministry of Edu. of China 510632 China Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China

The objective of this study is to show the potential of the crack detection method based on Wavelet Packet Transform (WPT), which is depending on the response at a single point on a beam subject to moving load. In this paper, an A-SYS model of a cracked beam is established. The moving load is transient analyzed by shifting the point of the concentrated force. The response at mid-span of the beam is calculated and wavelet packet transformed. The crack on the beam can be found by the abnormal signal in WPT branches. The size is also estimated by a defined damage index (Dindex) which relates to the energy of the abnormal signal. Finally, the effects of both crack location and wavelet selection on Dindex are discussed in detail.

关键词： Damage detection

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CRACK IDENTIFICATION IN STEPPED CANTILEVER BEAM COMBINING WAVELET ANALYSIS WITH TRANSFORM MATRIX

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Acta Mechanica Solida Sinica 2009年第4期22卷 360-368页

作者： Weiwei Zhang Zhihua Wang Hongwei Ma College of Science ＆ Engineering Jinan University Guangzhou 510632 China Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Jinan University Guangzhou 510632 China

This paper illustrates the crack identification method combining wavelet analysis with transform matrix. Firstly, the fundamental vibration mode was applied to wavelet analysis. The crack location was found by the peaks of the wavelet coefficients. Secondly, based on the identified crack locations, a simple transform matrix method requiring only the first two tested natural frequencies was used to further identify the crack depth. The present method can be used for crack identification in a complex structure. Numerical results of crack identification of a stepped cantilever beam show that the suggested method is feasible.

关键词： crack cantilever beam wavelet transform matrix

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Dynamic FE simulation of large-scale single-layer spherical shell with viscoelastic dampers

Dynamic FE simulation of large-scale single-layer spherical ...

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2009 Joint International Conference on Modelling and Simulation

作者： Yuan, Ping Li Wei, Zhang Key Lab. of Disaster Forecast and Control in Engineering Ministry of Education China Jinan University China Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9781846260612

A vibration reduction system of viscoelastic dampers is introduced into Kewitte single-layer latticed spherical shell (D=60m). Through dynamic FE simulation, the stability of controlled shell and the correspondent uncontrolled one is compared. The different vibration schemes with initial geometric imperfection under different earthquake loadings are especially investigated. The results show that Liapunov stability of controlled shell with viscoelastic dampers can be evidently improved when compared with the uncontrolled shell;the vibration reduction is more obvious when considering the initial geometric imperfection of the shell. The damper's parameters have great influence on the vibration control effort.

关键词： Stability

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Numerical simulation of protection range in exploiting the upper protective layer with a bow pseudo-incline technique

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Mining Science and Technology 2009年第1期19卷 58-64页

作者： HU Guo-zhong WANG Hong-tu LI Xiao-hong 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

The developing processes of stress and deformation fields of a protected layer after mining an upper-protective layer with a bow pseudo-incline technique were simulated to locate the protection region. The pressure relief of the protected layer was analyzed after mining the upper-protective layer. The pressure relief angle along the strike and incline were located according to the roles of protection of the deformation and stress pressure-relief of the protective layer after mining. This results show that the upper-protective layer with the bow pseudo-incline technique have an upper and downside pressure relief angle of 85 and 68 degrees respectively; the distribution of strike pressure relief angles along the pseudo-incline working face is uneven and their values range from 38.3 to 51 degrees. The pressure relief angle of the inclined middle location was the largest. The distribution of the protection region of the upper-protective layer with the bow pseudo-incline teelmique located by practical tests and numerical simulation is essentially consistent, compared with the results obtained by these methods.

关键词： bow pseudo-incline technique upper-protective layer protection region 3D numerical simulation

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Notice of Retraction: The Numerical Simulation of Crack Propagation without Re-Meshing

Notice of Retraction: The Numerical Simulation of Crack Prop...

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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Yang, Shuai Wang, Hong Xia, Xiao-Zhou Yuan, Hong College of Civil and Transportation Engineering GDUT Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics JNU Guangzhou China College of Civil Engineering HHU Nanjing China

ISBN: (纸本)9781424449941

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication *** hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this *** presenting author of this paper has the option to appeal this decision by contacting TPII@***.

关键词： Cracks

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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

作者： Cheng, Liangyan Song, Zhenhua Zhao, Jun Ma, Hongwei College of Science and Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Ministry of Education of China Guangzhou 510632 China

Determination of damage location and severity are important for the arch structure. First, the frequency perturbation formulate in damage identification are derived combining matrix perturbation theory with finite element technology. Next, an experimental test was carried out to determine the first six frequencies in the intact and damage arch structure. Finally, the location and severity of structural damages can be detected based on the measured natural frequencies of damage structure. The result shows the frequency perturbation method is feasible to the structural damage detection for the only need of frequency-data, and can be applied to damage detection in the arch structure. © 2009 SPIE.

关键词： Damage detection

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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

作者： Ma, Hongwei Cheng, Liangyan Song, Zhenhua Nie, Zhenhua Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Ministry of Education of China Guangzhou 510632 China College of Science and Engineering Jinan University Guangzhou 510632 China

In this paper, an efficient technique is proposed for identifying the impact forces acting on circular arch, which overcome the deficiency of ill-conditioned frequency response function (FRF) in the frequency domain approach. First the comparison of the force identifications based on Pseudo-Wavelet Deconvolution Method (PWDM) and Frequency Deconvolution Method (FDM) is introduced. Next, the excitation and structural response needed in PWDM are derived from experiment and simulation separately. Last, force reconstructions via PWDM with the simulated and measured arch structural responses are compared with the corresponding experimental input force. By virtue of this technique, the solution of this inverse problem for identifying the impact force becomes stable and accurate. Deficiently, some experience is needed in deciding the pulse width and the shift of wavelet force. © 2009 SPIE.

关键词： Arches

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