• Title, Summary, Keyword: Structural Characteristic Analysis

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Canonical correlation analysis based fault diagnosis method for structural monitoring sensor networks

  • Huang, Hai-Bin;Yi, Ting-Hua;Li, Hong-Nan
    • Smart Structures and Systems
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    • v.17 no.6
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    • pp.1031-1053
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    • 2016
  • The health conditions of in-service civil infrastructures can be evaluated by employing structural health monitoring technology. A reliable health evaluation result depends heavily on the quality of the data collected from the structural monitoring sensor network. Hence, the problem of sensor fault diagnosis has gained considerable attention in recent years. In this paper, an innovative sensor fault diagnosis method that focuses on fault detection and isolation stages has been proposed. The dynamic or auto-regressive characteristic is firstly utilized to build a multivariable statistical model that measures the correlations of the currently collected structural responses and the future possible ones in combination with the canonical correlation analysis. Two different fault detection statistics are then defined based on the above multivariable statistical model for deciding whether a fault or failure occurred in the sensor network. After that, two corresponding fault isolation indices are deduced through the contribution analysis methodology to identify the faulty sensor. Case studies, using a benchmark structure developed for bridge health monitoring, are considered in the research and demonstrate the superiority of the new proposed sensor fault diagnosis method over the traditional principal component analysis-based and the dynamic principal component analysis-based methods.

Vibration reduction of military vehicle frame with using structural dynamic characteristics analysis (구조 동특성 분석을 통한 군용 차량 프레임 진동 저감)

  • Lee, Sang-Jeong;Park, Jong-Beom;Park, No-Cheol;Lee, Jong-Hak;Kim, Han-Shang;Jeong, Eui-Bong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.281-284
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    • 2014
  • Unlike ordinary vehicle chassis frame, chassis frame of military vehicle is long and that is operated in harsh driving environment in middle of war. Thus, because large dynamic loads is acting on the frame, it is important to secure the durability of the frame based on the structural dynamic characteristic analysis. The purpose of the study is that the chassis frame is optimized to secure durability of the chassis frame of the military vehicle according to the structural dynamic characteristic analysis. Also, structure optimization are performed using parametric optimization and topology optimization methods.

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Structural Characteristic Analysis on the Hydrostatic Guide Way and Feeding System of a High-Precision Centerless Grinder for Machining Ferrules (페룰 가공용 초정밀 무심 연삭기의 유정압 안내면 및 이송계에 대한 구조 특성 해석)

  • Kim, Seok-Il;Lee, Won-Jae;Cho, Sun-Joo
    • Proceedings of the KSME Conference
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    • pp.1008-1013
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    • 2003
  • This paper concerns the structural characteristic analysis and evaluation on the hydrostatic guide way and feeding system of a high precision centerless grinder for machining ferrules. In order to realize the required accuracy of ferrules with sub-micron order, the axial stiffness and motion accuracy of feeding system have to become higher level than those of existing centerless grinders. Under these points of view, the physical prototype of feeding system consisted of steel bed, hydrostatic guide way and ballscrew feeding mechanism is designed and manufactured for trial. Experimental results show that the axial and vertical stiffnesses of the physical prototype are very low as compared with those design values. In this paper, to reveal the cause of these stiffness difference, the structural deformations on the virtual prototype of feeding system are analyzed based on the finite element method under experimental conditions. The simulated results illustrate that the deformation of front ballscrew support-bearing bracket is the main cause of reduction in the axial stiffness of feeding system, and the deflection of bed structure and the bending deformation of hydrostatic guide rails are the main causes of reduction in the vertical stiffness of feeding system.

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A Study on the Relationship Factors Between Buyer and Seller in Industrial Market (산업재 시장에서 구매자와 공곱자간 관계형성 요인에 관한 연구)

  • Lee, Seung-Hui;Kim, Hye-Gyeong
    • 한국디지털정책학회:학술대회논문집
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    • pp.255-271
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    • 2005
  • This paper aimed to exam core factors of the relationship factors and analyze their effects on structural bonds and social bonds. And this paper analysis structural bonds and social bonds effects on relationship commitment. To accomplish this purpose, this study examined previous studies and summarized core factors of the relationship making. The result of this study are as follow: First, we examined that 6 factors-tech-shared, product characteristic, transaction specific asset, reputation, trust, communication-were relationship factors of buyer-seller industrial market. Second, it is shown that tech-shared, product characteristic, transaction specific asset factors have a positi-ve influence on the structural bonding. Third, it is shown that reputation, trust, communication factors have a positive influence on the social bonding. Fourth, it is shown that structural bonding, social bonding have a positive influence on the relationship commitment.

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Probabilistic dynamic analysis of truss structures

  • Chen, J.J.;Che, J.W.;Sun, H.A.;Ma, H.B.;Cui, M.T.
    • Structural Engineering and Mechanics
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    • v.13 no.2
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    • pp.231-239
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    • 2002
  • The problem of dynamic analysis of truss structures based on probability is studied in this paper. Considering the randomness of both physical parameters (elastic module and mass density) of structural materials and geometric dimension of bars respectively or simultaneously, the stiffness and mass matrixes of the elements and structure have been built. The structure dynamic characteristic based on probability is analyzed, and the expressions of numeral characteristics of inherence frequency random variable are derived from the Rayleigh's quotient. The method of structural dynamic analysis based on probability is developed. Finally, two examples are given.

Identification of Structural Characteristic Matrices of Steel Bar by Genetic Algorithm (유전알고리즘에 의한 강봉의 구조특성행렬 산출법)

  • Park, S.C.;Je, H.K.;Yi, G.J.;Park, Y.B.;Park, K.I.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.10
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    • pp.946-952
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    • 2010
  • A method for the identification of structural characteristic parameters of a steel bar in the matrices form such as stiffness matrices and mass matrices from frequency response function(FRF) by genetic algorithm is proposed. As the method is based on the finite element method(FEM), the obtained matrices have perfect physical meanings if the FRFs got from the analysis and the FRFs from the experiments were well coincident each other. The identified characteristic matrices from the FRFs with maximun 40 % of random errors by the genetic algorithm are coincident with the characteristic matrices from exact FEM FRFs well each other. The fitted element diameters by using only 2 points experimental FRFs are similar to the actual diameters of the bar. The fitted FRFs are good accordance with the experimental FRFs on the graphs. FRFs of the rest 9 points not used for calculating could be fitted even well.