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  • Mobility and traffic research  (2)
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  • Mobility and traffic research  (2)
  • 1
    Online Resource
    Online Resource
    SAGE Publications ; 2013
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2336, No. 1 ( 2013-01), p. 75-82
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2336, No. 1 ( 2013-01), p. 75-82
    Abstract: This paper investigates the intrafleet and interfleet models for the solution of crew recovery problems during irregular airline operations. The intrafleet model groups crew members together and assigns them to flights in the same fleet. The interfleet model splits crew groups and reassigns them to flights across different fleets. Both models belong to the set covering problems with side constraints; however, the former is a 0–1 set covering problem whereas the latter is a general set covering problem. The models exhibit different computational characteristics. Various solution approaches are discussed, and a simulated annealing algorithm is developed for models that are difficult to solve. Computational results using data from a major airline show that the algorithm is able to provide effective and efficient solutions. These results also show that the intrafleet model, though widely used by airlines in practice, limits the solution space and can lead to inferior solutions. The interfleet model offers better recovery solutions for airlines under irregular operations.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 2403378-9
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  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2011
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2226, No. 1 ( 2011-01), p. 71-81
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2226, No. 1 ( 2011-01), p. 71-81
    Abstract: The NIKE3D three-dimensional finite element program is used by FAA for design and analysis of airport pavement thickness. This paper briefly describes research on improvements to the contact interface algorithm of NIKE3D and to the modeling of curling of concrete slabs. A modified algorithm to check the interface penetration has been developed and tested in the NIKE3D program. An example demonstrates that the improved program provides more accurate computational results. Both temperature and concrete shrinkage effects are considered in the modeling. In contrast to the traditional method of including shrinkage effects by changing material properties, a simple, innovative approach is used to predict approximate slab curling responses. A nonuniform distribution of the equivalent temperature gradient can effectively simulate the slab deflection under the combined environmental and wheel loads. Results from the improved NIKE3D program with the new method of modeling slab curling are compared with data from a full-scale slab test as well as with the commercial finite element program ABAQUS.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
    detail.hit.zdb_id: 2403378-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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