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Ratcheting Behavior of T225NG Titanium Alloy under Uniaxial Cyclic Stressing: Experiments and Modeling

Chinese Journal of Aeronautics 2005年第1期18卷 31-39页

作者：蔡力勋牛清勇邱绍宇刘宇杰 Department of Applied Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China.National Key Laboratory for Nuclear Fuel and Material Nuclear Power Institute of China Chengdu 610051China College of Science Wuhan University of Science and Technology Wuhan 430081China National Key Laboratory for Nuclear Fuel and Material Nuclear Power Institute of China Chengdu 610051China Department of Applied Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China

In order to investigate the ratcheting behavior of T225NG alloy, a series of ratcheting tests under uniaxial long-cyclic stressing were performed. The results show that the ratcheting strain of this alloy can get into shakedown after tens （or hundreds） of thousand cycles. After the ratcheting strain is saturated under the condition that stress amplitude is half of peak stress, it will bring about subsequent fatigue failure, and relationship between fatigue life and one of peak stress and saturated ratcheting （SR） strain meets power law. As the alloy is under stress jiggling with stress amplitude that is 1%-2.5% of peak stress, the ratcheting strain still become remarkable and goes into shakedown after several hundreds of thousand cycles but there exists little accessional strain caused by creep effect. It is notable that, when the peak stress is 85%-100% of yield stress, the long-cyclic stressing will lead SR strain to be from 1.4% to 2.5% even if the initial ratio of ratcheting strain is zero. Based on ratcheting threshold property of peak stress and monotonicity of relationship between the peak stress and SR strain, a saturated ratcheting model （SRM） is developed to predict SR strain and to estimate saturated creep strain also. In addition, the classes of ratcheting evolutions of metals are discussed.

关键词： T225NG titanium alloy shakedown ratcheting cycle plasticity stress strain fatigue creep

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Rough rings revisited

Rough rings revisited

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International Conference on Machine Learning and Cybernetics, ICMLC 2005

作者： Han, Su-Qing Cheng, Wei Wang, Jue Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Department of Mathematics Taiyuan Teacher's College Taiyuan 030012 China College of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China

ISBN: (纸本)078039092X

Rough groups and rough rings have been investigated by Biswas & Nanda [Bull. Polish Acad. Sci. Math. 42 (1994) 251-254], Kuroki and Wang [Inform. Sci. 90 (1996) 203-220] and Dawaz [Inform. Sci. 164 (2004) 147-163], But in which some conclusions do not always hold in general. In this paper, we have revisited rough rings in a uniform and complete form, some new properties of rough rings are obtained, and the modified versions of those conclusions that are improper in Davvaz [Inform. Sci. 164 (2004) 147-163] are modified. ©2005 IEEE.

关键词： Learning systems

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Method to evaluate measurement uncertainty of imprecise neutrons data

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Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams 2005年第3期17卷 460-462页

作者： Xiao, Ming-Zhu Chen, Guang-Ju College of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China Institute of Electronic Engineering China Academy of Engineering Physics P.O. Box 919-523 Mianyang 621900 China

The measurement uncertainty is often evaluated by a probabilistic approach, but such evaluation is not always adapted to imprecise measurement data. This paper focuses on the use of the evidence theory to evaluate the measurement uncertainty of imprecise neutrons data. A formula is presented to measure and calculate the measurement uncertainty of imprecise neutrons data coming from imprecise physical sensors and approximate estimations provided by experts, the validity of the formula is demonstrated by two examples. The formula can be applied to precise neutrons data too.

关键词： Data processing

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Rough rings revisited

Rough rings revisited

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Su-Qing Han Wei Cheng Jue Wang Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China College of Computer Science and Engineering University of Electronic Science and Technology Chengdu China

Rough groups and rough rings have been investigated by Biswas & Nanda [Bull. Polish Acad. Sci. Math. 42 (1994) 251-254], Kuroki and Wang [Inform. Sci. 90 (1996) 203-220] and Davvaz [Inform. Sci. 164 (2004) 147-163], but in which some conclusions do not always hold in general. In this paper, we have revisited rough rings in a uniform and complete form, some new properties of rough rings are obtained, and the modified versions of those conclusions that are improper in Davvaz [Inform. Sci. 164 (2004) 147-163] are modified.

关键词： Educational institutions Rough sets Laboratories Intelligent systems automation Mathematics Computer science Machine learning Cybernetics

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Radial basis function neural network models for power-amplifier design

Radial basis function neural network models for power-amplif...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Guoqing Xu Mingyu Li Youbai Xi College of Automation Engineering College of Electronic Engineering University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0780386477

A method for learning the dynamic responses of a nonlinear power-amplifier with a radial basis function (RBF) neural network is presented. The training data of the RBF neural networks are samples of the input and output waveforms of the power-amplifier. A new training scheme employing efficient gradient-based optimization methods is developed to train the RBF neural networks model. Simulation results are presented to demonstrate the superiority of the RBF neural networks compared with recurrent neural networks and other networks.

关键词： Radial basis function networks Neural networks Training data Power system modeling Circuits Power amplifiers Biological system modeling Design automation Modems Educational institutions

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Frequency domain interpolation wavelet transform based algorithm for harmonic analysis of power system

Frequency domain interpolation wavelet transform based algor...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Tianjun Du Guangju Chen Yong Lei CAT Lab College of Automation Engineering University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0780386477

A power system harmonic detection technique based on a frequency domain interpolation wavelet transform is proposed. Aiming at harmonic detection, a fast Fourier transform (FFT) can only detect integer harmonics; a short time Fourier transform (STFT) can detect non-integer harmonics with low resolution; a wavelet transform can detect non-integer harmonics, but it has spectral aliasing and spectral leakage phenomena, which result in low resolution. This paper uses a frequency domain interpolation algorithm to detect a harmonic signal by choosing a Shannon wavelet. Simulation and comparative results obtained by three algorithms reveal that: the proposed method can effectively eliminate spectral aliasing, spectral leakage and the Gibbs phenomenon; it can precisely detect a harmonic signal, so it provides an effective means for power system harmonic analysis and detection.

关键词： Frequency domain analysis Interpolation Wavelet analysis Wavelet domain Wavelet transforms Harmonic analysis Power system analysis computing Power system harmonics Leak detection Fast Fourier transforms

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Full load vehicle routing with multiple depots: A new, network flow based algorithm

Full load vehicle routing with multiple depots: A new, netwo...

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3rd International Conference on Traffic and Transportation Studies, ICTTS 2002

作者： Mingshan, Zhang Dali, Jiang Xiaowo, Tang School of Economics and Management Southwest University for Nationalities 12 Nan Si Duan Yi Huan Lu Chengdu 610041 China Department of Automation Engineering Logistic Engineering University 147 Changjiang Er Lu Chongqing 400042 China Management College University of Electronics Science and Technology of China 4 Jianshe Bei Lu Chengdu 610054 China

ISBN: (纸本)0784406308

This paper considers the problem of scheduling a fleet of identical vehicles to execute a set of freight orders in truckload quantities. Each freight order is given in terms of an origin and a destination and the number of truckloads to be transported between them. The goal is to minimize the total cost of travel while completing all freight orders. Our work is the first to allow vehicles to be dispatched from a depot and discharged into another after service. We propose an algorithm that starts from an optimal solution to a network flow model which considers all data in the problem in parallel including unloaded travel costs, freight orders, depots, availability of vehicles and the vehicle receiving capacity at each depot. The network solution is then iteratively modified through heuristic operations and the routing of vehicles is determined, one at a time, based on the modified solution. A novel feature of the algorithm is the option of resolving the network model for scheduling the remaining vehicles.

关键词： Vehicle routing

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A New Algorithm for Spectral Drift Calculation in a Gamma-ray Spectrometer

A New Algorithm for Spectral Drift Calculation in a Gamma-ra...

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The 2011 International Conference on Smart Materials and Nanotechnology in engineering (ICSMCE2011)

作者： Qin Zhangjian Ge Liangquan Wu Qifan Cheng Jianping School of Nuclear Technology and Automation Engineering Chengdu University of Technology Department of Engineering Physics Tsinghua University

Spectral drift of any origin consisting of detectors and nuclear electronics affects the long-term stability in a gamma-ray spectrometer, which is essential to maintaining the high quality of gamma energy spectraThe feedback regulation according to the quantity of spectral drift can restore the system's stabilityA new algorithm for spectral drift calculation is given in this paperA digital logic unit is developed in a FPGA chip based on the algorithm, and a MCU coordinating with it can fast calculate the spectral drift within only less than 110 instruction periods.

关键词： Spectral drift Spectra stabilization Gamma-ray spectrometer Least squares method

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Ion-beam-sputtering/mixing deposition of calcium phosphate coatings. I. Effects of ion-mixing beams

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Journal of Biomedical Materials Research Part B: Applied Biomaterials 2001年第4期55卷

作者： C.-X. Wang Z.Q. Chen M. Wang Z.Y. Liu P.L. Wang Department of Dental Materials College of Stomatology West China University of Medical Sciences Chengdu 610041 Sichuan China School of Mechanical and Production Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore Laboratory of Radiation Physics and Technology Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 Sichuan China

Ion-beam-sputtering/mixing deposition was used to produce thin calcium phosphate coatings on titanium substrate from the hydroxyapatite target. The mixing beam could be either Ar + or N + ions. It was found that as-deposited coatings were amorphous. No distinct peak of the hydroxyl group was observed in FTIR spectra of the coatings, but new spectral peaks, brought about during the deposition process, were present for CO 3 2− . Scanning electron microscopy revealed that the deposited coatings had a uniform and dense structure. The calcium-to-phosphorous ratio of these coatings varied between 2.0 and 3.0. Compared with the calcium phosphate coatings produced by Ar + beam-mixing deposition, the calcium phosphate coatings produced by N + beam-mixing deposition exhibited a higher dissolution rate in the physiologic saline solution and showed a lower proliferation rate of osteoblast cells. © 2001 John Wiley & Sons, Inc. J Biomed Mater Res 55: 587–595, 2001

关键词： ion-beam-sputtering/mixing deposition calcium phosphate coating titanium dissolution rate cell culture

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Research on fault tree of radar launch system based on fuzzy judgment

Research on fault tree of radar launch system based on fuzzy...

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2011 2nd Asia-Pacific Conference on Wearable Computing Systems (APWCS 2011);2011 International Conference on Intelligent Control and Information technology(ICICIT 2011)

作者： ZHENG Xian-ju ZHANG Wei XIE Chun LUO Hang Computer engineering dept.Chengdu Electromechanical College Automation engineering college University of Electronic Science and Technology of China

It is much more difficult to obtain failure probability of bottom-events of fault tree by means of traditional method if there has no enough or lack failure information of parts(or modules). In this a

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