Home / Journals / SDHM / Vol.9, No.2, 2013
  • Open Access

    ARTICLE

    Structural System Identification Using Quantum behaved Particle Swarm Optimisation Algorithm

    A. Rama Mohan Rao1, K. Lakshmi1, Karthik Ganesan2
    Structural Durability & Health Monitoring, Vol.9, No.2, pp. 99-128, 2013, DOI:10.32604/sdhm.2013.009.099
    Abstract Development of efficient system identification techniques is highly relevant for large civil infrastructure for effective health monitoring, damage detection and vibration control. This paper presents a system identification scheme in time domain to estimate stiffness and damping parameters of structures using measured acceleration. Instead of solving the system identification problem as an inverse problem, we formulate it as an optimisation problem. Particle swarm optimisation (PSO) and its other variants has been a subject of research for the past few decades for solving complex optimisation problems. In this paper, a dynamic quantum behaved particle swarm optimisation algorithm (DQPSO) is proposed for… More >

  • Open Access

    ARTICLE

    Structural Integrity and Health Monitoring of Road and Railway Tanks based on Acoustic Emission

    G. Savaidis1, M. Malikoutsakis1, A. Jagenbrein2, A. Savaidis3, M. Soare4, M.V. Predoi4, A. Soare4, I.C. Diba4
    Structural Durability & Health Monitoring, Vol.9, No.2, pp. 129-154, 2013, DOI:10.32604/sdhm.2013.009.129
    Abstract Development of corrosion or/and fatigue crack propagation are the most common causes of structural degradation in road and railway tank vessels. An acoustic emission based monitoring procedure in conjunction with follow-up nondestructive testing is here proposed as a promising alternative to the conventional inspection processes enabling continuous health monitoring of the tank structures. Thereby, finite element analysis taking the respective ADR and RID tank design loads into account is proposed as a capable tool to be applied in early stages of development to reveal the hot spot areas, where acoustic emission sensors have to be positioned. The developed health monitoring… More >

  • Open Access

    ARTICLE

    Structural Analysis of a Lab-Scale PCHE Prototype under the Test Conditions of HELP

    K.N. Song1, S. D. Hong1
    Structural Durability & Health Monitoring, Vol.9, No.2, pp. 155-165, 2013, DOI:10.32604/sdhm.2013.009.155
    Abstract The IHX (Intermediate Heat Exchanger) of a VHTR (Very High Temperature Reactor) transfers 950° heat generated from the VHTR to a hydrogen production plant. The Korea Atomic Energy Research Institute (KAERI) has manufactured a lab-scale PCHE (Printed Circuit Heat Exchanger) prototype made of SUS316L under consideration as a candidate. In this study, as a part of a hightemperature structural integrity evaluation of the lab-scale PCHE prototype, a macroscopic structural behavior analysis including structural analysis modeling and a thermal/elastic structural analysis was carried out under the test conditions of a helium experimental loop (HELP) as a precedent study for a performance… More >

  • Open Access

    ARTICLE

    Some Recent Developments on the Application of the Strain Energy Density to Shallow Threaded Plates with Sharp Notches

    R. Afshar1, F. Berto1
    Structural Durability & Health Monitoring, Vol.9, No.2, pp. 167-180, 2013, DOI:10.32604/sdhm.2013.009.167
    Abstract In this study, the main advantages of the strain energy density (SED) approach and some recent applications of the SED to the fatigue analysis of welded joints are reviewed. In addition, the paper investigates the scale effect in the threaded plates with sharp notches subjected to tension loading. Some closed form expressions for evaluation of the notch stress intensity factors (NSIFs) of periodic sharp notches, obtained by SED approach, are employed. The new expressions are applicable to narrow notches when the ratio between the notch depth and the plate width, t/W, is lower than 0.025 providing very accurate results. The… More >

  • Open Access

    ARTICLE

    Structural Effect Evaluation of Ballistic Impact on a Shaft by Crystallography

    C. Mapelli1, A. Manes1,2, M. Giglio1, D. Mombelli1
    Structural Durability & Health Monitoring, Vol.9, No.2, pp. 181-199, 2013, DOI:10.32604/sdhm.2013.009.181
    Abstract The definition of a complex operative scenario like ballistic damage, that introduces large strains and failure, is a current challenge in the design of critical mechanical components. Aerospace, automotive and manufacturing industries have recently increased their interest in numerical simulations with the long term aim to make these approaches not only reliable enough to reproduce the experimental results but also to provide a trustworthy and effective tool for design. To achieve this aim, the knowledge and calibration of material behaviour is required. Starting from a previous characterization of the constitutive law and ductile failure criterion of Al 6061-T6 aluminium alloy,… More >

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