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International Symposium on Photonics and Optoelectronics, SOPO 2010

作者： Wang, Dongmin Huang, Furong Chen, HuaCai Jin, Shangzhong Chen, Xingdan Key Laboratory of Disaster Forecast and Control in Engineering 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 of Sciences Changchun 130022 China

ISBN: (纸本)9781424449644

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. ©2010 IEEE.

关键词： Near infrared spectroscopy

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Study on the Gasoline Classification Methods Based on near Infrared Spectroscopy

Study on the Gasoline Classification Methods Based on near I...

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Photonics and Optoelectronics, SOPO

作者： Jun Zhang Li Jiang Qian Yu Zhe Chen Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of the Peoples Republic of China Jinan University Guangzhou China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China (Jinan University) Guangzhou China Key Laboratory of Optoelectronic Information and Sensing Technologies Guangdong Higher Educational Institutes (Jinan University) Guangzhou China

The purpose of this paper is to classify 93# and 97# gasoline by using principal component analysis (PCA) with self-organizing competitive neural network method and to establish near infrared transmission spectroscopy and reflectance spectroscopy qualitative identification model in 1100-1700nm spectral region. The spectral data is condensed by PCA method before modeling, and three principal components are chosen because their cumulative credibility has reached 97%. A three-layer self-organizing competitive neural network model is established based on the PCA method. Thirty-two wavelengths' absorbance is served as inputs of the self-organizing competitive neural network. The learning parameter is set as 0.01 and the training iteration is taken as 500. The conclusion is that it is feasible to apply near infrared transmission spectroscopy and reflectance spectroscopy qualitative identification model to discriminate the gasoline products as the PCA and self-organizing competitive neural networks method is used.

关键词： Petroleum Infrared spectra Spectroscopy Principal component analysis Artificial neural networks Neurons Neural networks Monitoring Reflectivity Calibration

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THEORETICAL MODEL ON INTERFACE FAILURE MECHANISM OF REINFORCED CONCRETE CONTINUOUS BEAM STRENGTHENED BY FRP

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Acta Mechanica Solida Sinica 2009年第2期22卷 161-170页

作者： Hong Yuan Zifeng Lin MOE Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou 510632 China

Fiber reinforced polymer （FRP） composites are increasingly being used for the re-pair and strengthening of deteriorated concrete structural components through adhesive bonding of prefabricated strips/plates and the wet lay-up of fabric. Interfacial bond failure modes have attracted the attention of researchers because of the importance. The objective of the present study is to analyse the interface failure mechanism of reinforced concrete continuous beam strength-ened by FRP. An analytical solution has been firstly presented to predict the entire debonding process of the model. The realistic bi-linear bond-slip interfacial law was adopted to study this problem. The crack propagation process of the loaded model was divided into four stages （elastic,elastic-softening,elastic-softening-debonded and softening-debonded stage）. Among them,elastic-softening-debonded stage has four sub-stages. The equations are solved by adding suitable stress and displacement boundary conditions. Finally,critical value of bond length is determined to make the failure mechanism in the paper effective by solving the simultaneously linear algebraic equations. The interaction between the upper and lower FRP plates can be neglected if axial stiffness ratio of the concrete-to-plate prism is large enough.

关键词： FRP interface bond-slip law critical length continuous beam ultimate load

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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

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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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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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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Analysis of optical transmission characteristics in the waveguide of side polished fiber

Analysis of optical transmission characteristics in the wave...

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2009 International Conference on Optical Instruments and Technology, OIT'09

作者： Zhe, Chen Zuping, He Fei, Cui Yating, Xiao Jun, Zhang Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education Jinan University 510632 China Key Lab. of Optoelectron. Info. and Sensing Technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou 510632 China Department of Optoelectronic Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9780819478948

According to the experimental results of side polished fiber (SPF), a three dimensional optical waveguide model with longitudinal side polished transition zones is built. Based on the model, characteristics of optical transmission are calculated and analyzed by three dimensional finite differential beam propagation method. The model describes the optical transmission characteristics because the calculation based on the model is fitted well with the experiments. The calculation shows that the length of side polished area affects the optical attenuation of optical fiber, but the attenuation does not increased monotonically with the length when the length is less than certain value. The relationship between optical attenuation of SPF and the thickness of residual side polished cladding is not a monotonie one as well. The refractive index of overly on the side polished area has much more effect on the optical attenuation. Both width and thickness of overlay on the side polished area cause the oscillated change of optical power attenuation in the fiber core. © 2009 SPIE.

关键词： Light transmission

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Method of Green’s function of nonlinear vibration of corrugated shallow shells

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Science China(Physics,Mechanics & Astronomy) 2008年第6期51卷 678-686页

作者： YUAN Hong key laboratory of disaster forecast and control in engineering, Ministry of Education of China, Institute of Applied Mechanics, Jinan University, Guangzhou 510632, China 1. Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Institute of Applied Mechanics Jinan University Guangzhou 510632 China

Based on the dynamic equations of nonlinear large deflection of axisymmetric shallow shells of revolution, the nonlinear free vibration and forced vibration of a corrugated shallow shell under concentrated load acting at the center have been investigated. The nonlinear partial differential equations of shallow shell were re-duced to the nonlinear integral-differential equations by using the method of Green’s function. To solve the integral-differential equations, the expansion method was used to obtain Green’s function. Then the integral-differential equations were reduced to the form with a degenerate core by expanding Green’s function as a series of characteristic function. Therefore, the integral-differential equations be-came nonlinear ordinary differential equations with regard to time. The ampli-tude-frequency relation, with respect to the natural frequency of the lowest order and the amplitude-frequency response under harmonic force, were obtained by considering single mode vibration. As a numerical example, nonlinear free and forced vibration phenomena of shallow spherical shells with sinusoidal corrugation were studied. The obtained solutions are available for reference to the design of corrugated shells.

关键词： corrugated shells spherical shells Green’s function integral equation nonlinear vibration

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