Open Access
ARTICLE
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
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
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
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
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
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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