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2012 International Conference on Computer Science and Electronics engineering, ICCSEE 2012

作者： Peng, Kexin Tuo, Xianguo Cai, Biao Wang, Yuling College of Nuclear Technology and Automation Emerging Chengdu University of Technology Sichuan Chengdu China School of Information Science and Technology Chengdu University of Technology Sichuan Chengdu China Xindu District Electric Power Supply Bureau Chengdu Electric Power Bureau Xindu China

ISBN: (纸本)9780769546476

Noise is an important factor in image quality of TGS In according to the Neighborhood Homogeneous Measurement (NHM) was proposed to process the salt-pepper noise of TGS image system which avoided the shortcomings of traditional median filtering algorithm and improved median filtering algorithm. A cross noise measurement window was designed in adaptive median filtering algorithm to adjust the domain of image pixel, which divided image pixel into noise and signal point through the calculation results of NHM. The iteration method was introduced to inhibit noise signal. The results showed that adaptive median filtering algorithm could effectively reduce the salt-pepper noise of TGS image system. © 2012 IEEE.

关键词： Iterative methods

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Eddy Current Pulsed Thermography for Gear Fatigue Evaluation:An open access database and its applications

Eddy Current Pulsed Thermography for Gear Fatigue Evaluation...

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第十届全国无损检测学术年会

作者： Ai Jun Yin Gui Yun Tian Liang Chen Jishan Zhang Brian Shaw State Key Laboratory of Mechanical Transmission College of Mechanical Engineering Chongqing Universi School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu61 School of Electrical and Electronic Engineering Newcastle UniversityNewcastle upon TyneNE1 7RUUni Design unit School of Mechanical Engineering and SystemNewcastle UniversityNewcastle upon TyneNE1

Pulsed eddy current (PEC) technique generates responses over a wide range of frequencies, containing more spectral coverage than traditional eddy current *** current pulsed thermography (ECPT), a newly developed non-destructive testing (NDT) technique, has advantages such as rapid inspection of a large area within a short time, high spatial resolution, high sensitivity and stand-off measurement *** paper investigates ECPT for the evaluation of gear fatigue *** paper proposes a statistical method based on single channet blind source separation to extract details ot gear *** discussion of transient thermal distribution and patterns of fatigue contact surfaces as well as the non-contact surfaces have been *** addition, the measurement for gears with different cycles of fatigue tests by ECPTand the comparison results between ECPT with magnetic Barkhausen noise (MBN) have been *** comparison shows the competitive capability of ECPT in fatigue *** open access database of ECPT for gear fatigue evaluation is provided, and freely obtained to further analysis for gear fatigue evaluation.

关键词： Eddy current pulsed thermography Gear fatigue Evaluation Non-destructive testing

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Towards a Model for Information Traffic Flow in Wireless Networks

Towards a Model for Information Traffic Flow in Wireless Net...

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2010 3rd International Conference on Computer and Electrical engineering(ICCEE 2010)

作者： Mingzhe Liu Shibo Zhao Jianbo Yang Zhe Li College of Network Education Chengdu University of Technology College of Nuclear Technology and Automation Engineering Chengdu University of Technology

This paper presents a discrete stochastic model for information traffic flow through wireless networks. Many wireless nodes are powered by batteries. Thus, the number and buffer size of wireless nodes would greatly affect the performance of the system. The performance analysis is based on the throughput (J)-density (ρ) relationship. It is shown that the system may exist in one of three steady-state regions: low-density (LD), high-density (HD) and maximal-current (MC). In the MC region, the maximal throughput 0.5 is reached. The LD region corresponds to free flow;while the HD region is congested traffic with J=1-ρ. The simulation results suggest that throughput is related to the number of buffer size, but independent of the number of intelligent nodes.

关键词： Wireless negtwor Information traffic Asymmetric exclusion process Monte Carlo simulations

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Towards a hybrid optimization model for elemental content analysis in EDXRF

Towards a hybrid optimization model for elemental content an...

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International Conference on Natural Computation (ICNC)

作者： Jun Ren Mingzhe Liu Xianguo Tuo Zhe Li Rui Shi College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China State Key Laboratory of Geohazard Prevention and GeoEnvironment Protection College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

This paper presents a hybrid optimization model for predicting the elemental contents such as Ti, V and Fe in energy dispersive X-ray fluorescence (EDXRF) based on least square support vector machine (LS-SVM) and particle swarm optimization (PSO) methods. The model used PSO to optimize LS-SVM parameters. In order to assess the capability and effectiveness of the proposed model, several measurement methods such as SVM model and BP neural network model were compared. The results indicate that the proposed model is feasible for quantitative analysis of elemental contents in nondestructive nuclear measurement applications.

关键词： Support vector machines Optimization Particle swarm optimization Analytical models Computational modeling Iron Training

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3D geological documentation system based on digital photogrammetry

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12th International Congress on Rock Mechanics of the International Society for Rock Mechanics, ISRM 2011

作者： Guo, L.Q. Liao, J.B. Chen, J.J. Yu, X. Tao, J. College of Manufacturing Science and Engineering Sichuan University Chengdu China Northwest Institute of Nuclear Technology Xi'an China

ISBN: (纸本)9780415804448

To overcome the shortage of the traditional geological documentation methods, advanced technologies were synthetically applied to the technical research on a new 3D geological documentation system, among which are digital closerange photogrammetries, computer vision, image processing and spatial database. In this paper, the self-calibration of cameras by pure rotating and zooming, the feature identification of the rock mass discontinuity surfaces or traces, the 3D model reconstruction of the tunnel and the visual measurement of the geological documentation elements are described. A high resolution metric 3D image resulting from this system represents an objective record of a tunnel face rock mass conditions. Rock mass discontinuity orientations could be measured from the 3D image. This system realizes rapid and high resolution acquisition of the field data, and realizes information measurement, fusion and visual analysis at a later time, which could provide a new method for geological documentation. © 2012 Taylor & Francis Group, London.

关键词： Rock mechanics

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Feature extraction of bearing vibration signals using autocorrelation denoising and improved Hilbert-Huang transformation

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第4期6卷 150-158页

作者： Xue, Ya-Juan Cao, Jun-Xing Tian, Ren-Fei Ge, Qing Chengdu University of Technology Chengdu Sichuan 610059 China College of Communication Engineering Chengdu University of Information Technology Chengdu Sichuan 610225 China The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu Sichuan 610059 China

In order to extract the fault feature frequency of weak bearing signals, an Hilbert-Huang transform(HHT) method combining with autocorrelation transform is put forward in this study. After performing autocorrelation denoising, the empirical mode decomposition(EMD) method was used to decompose the signals into a number of intrinsic mode functions(IMFs). Energy ratio of the each IMF's energy to the original signal energy was calculated to select a valid set of IMF by selecting the appropriate threshold. And the marginal spectrum was obtained to detect bearing fault information and identify the fault patterns. This method is suitable for extracting the fault characteristics of the weak fault signals in strong noise.

关键词： Autocorrelation

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Remote Landslide Observation System with Differential GPS

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Procedia Earth and Planetary Science 2012年 5卷 70-75页

作者： Xing Zhu Qiang Xu Jianbin Zhou Maolin Deng State Key Laboratory of Geohazard Prediction and Geoenvironment Protection Chengdu 610059 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059China

With aim to master early deformation stages and motion laws of landslide, the raw displacement data of landslide are very important for the landslide researchers and environmental scientists. With the recent advances of Global Position System (GPS) and computer science, the differential GPS technology now can be used for the remote displacement observation of landslide. Therefore, the paper developed a landslide displacement remote observation system based on differential GPS technology to get the raw displacement data continually. The system is divided into hardware and software functional segments. A real landslide in southwest of China was monitored for several months through observation using this GPS-based system placed around and the observed results are presented in this paper. The practical application shows that this system has such advantages as being highly-precise, nearly real-time, remote, continuous and automatic.

关键词： deformation stages differential GPS landslide remote observation real-time

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Prognostics method for analog electronic circuits

Prognostics method for analog electronic circuits

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2012 Annual Conference of the Prognostics and Health Management Society, PHM 2012

作者： Vasan, Arvind Sai Sarathi Long, Bing Pecht, Michael Center for Advanced Life Cycle Engineering University of Maryland College ParkMD20742 United States School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781936263059

Analog electronic circuits are an integral part of many industrial systems. Failure in such analog circuits during field operation can have severe economic implications. The presence of an expert system that can provide advance warnings on circuit failures can minimize the downtime and improve the reliability of electrical systems. Through successive refinement of circuit's response to a sweep signal, features are extracted for fault prognosis. From the extracted features, a fault indicator is developed. An empirical model is developed based on the degradation trend exhibited by the fault indicator. Particle filtering approach is used for model adaptation and remaining useful performance estimation. This framework is completely automated and has the merit of implementation simplicity. The proposed framework is demonstrated on two analog filter circuits.

关键词： Expert systems

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Kinematics simulation and control design of the Agile Wrist in a Dual-arm robotic mechanical systems

Kinematics simulation and control design of the Agile Wrist ...

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IEEE International Conference on Computer Science and automation engineering (CSAE)

作者： Yang Jian Jorge Angeles College of Nuclear Technology & Automation Chengdu University of Technology Chengdu China Department of Mechanical Engineering & Centre for Intelligent Machines McGill University Montreal Canada

In order to improve space positioning accuracy of the Agile Wrist consisting of a modified spherical parallel manipulator, which will influence the result of the Collisions experiment in a robotic mechanical testbed directly, this paper explores the motion control of Agile Wrist. Based on analysis an input - output (I/O) equation of spherical four-bar linkages for forward-displacement of spherical parallel robots, the inverse kinematics derivation is reported here to find the active-joint variables for each possible position and orientation (pose) of the mobile plate, as well as the singularity exist and defines what may be generalized as the workspace boundary. Meanwhile the kinematics simulation by using simulink S-Function combined with Q8 controller was carried out. The results showed that the Kinematics analysis and Control Design of Agile Wrist were correct. The modified spherical parallel manipulator can meet with the demands of Collisions experiment in the robotic mechanical testbed.

关键词： Kinematics Manipulators Wrist Collision avoidance Equations Mathematical model

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A hybrid of BP network and H-H model to study neural genesis of mammalian respiratory rhythm

A hybrid of BP network and H-H model to study neural genesis...

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2012国际生理学学术大会

作者： Hongrui An Fei Li Li Chen Hua Zhou Yuhong Tang Yu Zheng Department of Physiology West China School of Preclinical and Forensic MedicineSichuan University Department of Application of Nuclear Technology The College of Nuclear Technology and Automation EngineeringChengdu University of Technology

＜正＞Most models of respiratory rhythmogenesis are built based on H-H principle,but without any substantive *** network is a widely used model to study artificial intelligent *** work is carried out to establish a new model of generation of respiratory rhythm with combination of the 2 models. Five basic respiratory neurons models were built according to H-H *** data from them were used as input vectors of BP *** discharge was considered as output *** weights array was obtained by using *** platform was designed with the weights *** chose 5-X-1 BP structure by using reported data about respiratory network models and got the best number（8） of hidden layer *** event of a respiratory cycle was divided successively into 100 sets of data to test the Train,Validation and Test on ratio of 70:15:15,*** R of Train,Validation and Test is bigger than *** can be concluded that H-H style and BP network can be combined as a new method to build a highly feasible respiratory neural network model.

关键词： respiratory rhythm BP network H-H model

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