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  • Open Access

    ARTICLE

    Quality of Service Rerouting in Cognitive Network

    Y.B.Gandole1
    Structural Longevity, Vol.7, No.2, pp. 67-86, 2012, DOI:10.3970/sl.2012.007.067
    Abstract The cognitive behavior based on the cognitive science model for the network nodes to benefit the Quality of Service rerouting is designed. A Quality of Service rerouting protocol oriented to cognitive network is proposed. Rerouting is a distributed protocol where the route search is in a hop by hop way. Inspired by the small-world phenomenon, the experiential route information is collected and stored at each node to benefit the future route selection. We implement and evaluate Quality of Service rerouting in NS2 platform. Its performance is compared with another two popular routing protocols. The results show that Cognitive Rerouting has… More >

  • Open Access

    ARTICLE

    A Design Method for High-Speed Train Nose Shape under Multi-Line Cases

    Huairui Zhao1,2, Qiang Li1, Xiaofan Li3, Dietmar Rempfer3,4
    Structural Longevity, Vol.7, No.2, pp. 87-103, 2012, DOI:10.3970/sl.2012.007.087
    Abstract Different railway line cases with different object functions will result in different or completely adverse optimal nose shape. In this paper, a method for high-speed nose shape design was proposed to provide a suitable nose shape under multi-line cases. The method with emphasis on reduction of computational costs combines metamodel and numerical optimization techniques. An exemplary nose shapes under open air and passing tunnel line cases were designed by this technique. The comparison between the current CRH2 and those optimal nose shapes demonstrated the capabilities of the method. More >

  • Open Access

    ARTICLE

    Effect of Stress on Flow and Transport in Fractured Rock Masses Using a Modified Crack Tensor Theory

    Z. Wang1,2, J. Rutqvist1, Y. Wang3, Y. Dai2,4
    Structural Longevity, Vol.7, No.2, pp. 105-116, 2012, DOI:10.3970/sl.2012.007.105
    Abstract We used a slightly modified version of Oda’s crack tensor theory for developing and applying a modeling approach (that we characterize as a discrete continuum) to upscale the hydraulic and mechanical properties of fractured rock masses. The modified crack tensor theory was used to calculate the stress-dependent permeability tensor and compliance tensor for the individual grid block. By doing this, we transformed a discrete fracture network model into a grid-based continuum model. The methodology was applied to a benchmark test related to fluid flow and transport through a 20 × 20 m model domain of heavily fractured media. This benchmark… More >

  • Open Access

    ARTICLE

    Numerical Model and a Methodology on the Analysis of Complicated Wire Rope Structures

    C. Erdönmez1, C.E. ˙Imrak2
    Structural Longevity, Vol.7, No.2, pp. 117-121, 2012, DOI:10.3970/sl.2012.007.117
    Abstract Wire ropes have complicated structures. Its core is assembled using six wire strands around a simple straight wire strand and called as Independent Wire Rope Core (IWRC). IWRCs are used as the core for most complex structured wire ropes as Seale IWRC. In this paper as a complex wire rope structure the construction of Seale IWRC is described and its finite element analysis (FEA) is mentioned. The proposed methodology gives wire by wire results and as a result gives necessary information about the wire behavior within a wire rope. More >

  • Open Access

    ARTICLE

    Simulation of Tidal Current, Wind and Wave for Numerical Navigation of Ship

    S. Shiotani1
    Structural Longevity, Vol.7, No.2, pp. 123-128, 2012, DOI:10.3970/sl.2012.007.123
    Abstract This paper deals with the numerical estimation methods of the tidal current, the wind and the wave in the coastal sea area. Such estimates are very important because the tidal current, the wind and the wave react to effect manoeuvring of a advanced ship. The numerical estimations of the tidal current, wind and wave were carried out in the bay. As an application of these estimations, numerical navigation of a sailing ship was conducted. It was proved that the effects of the tidal current, the wind and the wave in coastal sea on a sailing ship could be accurately estimated… More >

  • Open Access

    ARTICLE

    Optimization of MEMS Piezo-Resonators

    A. Frangi1, M. Cremonesi1, A. Jaakkola2, K. Bathe2
    Structural Longevity, Vol.7, No.2, pp. 129-134, 2012, DOI:10.3970/sl.2012.007.129
    Abstract Single crystal silicon MEMS resonators are a potential alternative to quartz for timing and frequency control applications. Even if capacitive resonators with very high quality factors have been demonstrated and produced commercially, in order to achieve a good electromechanical coupling and admissible impedance levels, large bias voltages and submicron gaps are required. To overcome these challenges, piezotransduced bulk MEMS resonators have rapidly emerged as a valid alternative. We propose a numerical strategy to simulate dissipation mechanisms that correctly reproduce available experimental data. More >

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