000022353 001__ 22353
000022353 005__ 20170622150009.0
000022353 04107 $$aeng
000022353 046__ $$k2015-05-25
000022353 100__ $$aKouroussis, Georges
000022353 24500 $$aRAILWAY-INDUCED GROUND VIBRATIONS IN THE PRESENCE OF LOCAL TRACK IRREGULARITIES AND WHEEL FLATS

000022353 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022353 260__ $$bNational Technical University of Athens, 2015
000022353 506__ $$arestricted
000022353 520__ $$2eng$$aRapid growth in railway infrastructure has led to numerous environmental technical challenges. This includes ground-borne vibration, which is becoming an increasing problem, particularly in urban environments. A common source of this vibration is local defects (e.g. rail joints, switches and crossings) which cause large amplitude excitations at isolated locations. Modelling this type of excitation mechanism using typical linear frequency domain analysis is challenging and therefore non-linear time domain methods are required. Therefore, in this study a validated and comprehensive time domain, three-dimensional ground vibration prediction model is used to investigate the vibrations generated at the wheel/rail contact due to local rail and wheel surface defects. Different types of rail and wheel defect are mathematically modelled, including rail joints, switches, crossings and wheel flats. The track is modelled as a typical ballasted track, using a two-step approach where the vehicle/track dynamics and ground wave propagation are simulated separately. The first step models the effect of railway vehicles (using a multibody approach with many degrees of freedom) on the dynamic excitation of the track and incorporates a non-linear Hertzian contact law at the wheel/rail interface. The second step applies these track-vehicle model forces to a finite/infinite element model to accurately generate vibration time histories for required ground-borne vibration assessment. This work focuses on the AM96 trainset, largely used in the Brussels Region (Belgium). The geometries of a variety of local defect types are analysed and a sensitivity analysis is undertaken based on the defect size and train speed. It is found that defect type and geometry have a significant influence on vibration levels, and that only selected geometry types are effected by train speed. 1

000022353 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022353 653__ $$awheel/rail impact, vehicle/track interaction, ground-borne vibration, environmental impact assessment, flat wheel, local track irregularities

000022353 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022353 720__ $$aKouroussis, Georges$$iVerlinden, Olivier$$iVogiatzis, Konstantinos$$iConnolly, David$$iAlexandrou, Georgios
000022353 8560_ $$ffischerc@itam.cas.cz
000022353 8564_ $$s795931$$uhttps://invenio.itam.cas.cz/record/22353/files/C582.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022353 962__ $$r22030
000022353 980__ $$aPAPER