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SUMMARY:Prediction and mitigation of railway induced vibration in the buil
 t environment - Prof Geert Degrand\, KU Leuven
DTSTART:20221021T130000Z
DTEND:20221021T140000Z
UID:TALK183212@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Railway transport is widely promoted as the most environmental
 ly friendly and safe means of transport in terms of energy consumption\, C
 O2 and exhaust atmospheric emission\, and reported accident levels.  A maj
 or environmental challenge to increased rail transport is the generation o
 f low frequency vibration (1-80 Hz) and re-radiated noise (16-250 Hz) in b
 uildings. Vibration and noise can cause annoyance to residents and disrupt
  sensitive equipment\, ultimately threatening main European rail corridors
  and hindering development of new railways. Legal limits and best-practice
  guidelines exist to minimize vibration disturbance\, but the complexity o
 f the urban environment means that accurately predicting vibration levels 
 remains an extremely difficult task\, especially for new-built situations.
  \nDuring the past decades\, considerable progress was made regarding the 
 development of semi-analytical and numerical models for the prediction of 
 railway induced vibration in the built environment. These include\, for ex
 ample\, 2.5D and periodic coupled finite element – boundary element (FE-
 BE) or FE-PML models of the track and soil\, as well as 3D FE-BE models fo
 r buildings accounting for dynamic soil-structure interaction (SSI). These
  models are used to design vibration mitigation measures and to perform en
 vironmental impact studies.\nAccurate numerical prediction of railway indu
 ced vibration in buildings remains very challenging\, however\, given the 
 complexity of the coupled dynamic SSI problems involved\, the wide frequen
 cy range of interest\, the large number of determining parameters and thei
 r associated level of uncertainty. \nWe will illustrate these challenges b
 y comparison of model predictions with experimental results obtained durin
 g a large scale in situ measurement campaign in a three-storey reinforced 
 concrete building located in close proximity of a ballast track on embankm
 ent that is operated by freight and passenger trains.\nIndustry experience
 s a strong need to conduct extended parametric studies (e.g. track type\, 
 soil characteristics\, building typology) and to optimize vibration mitiga
 tion measures (track\, transmission\, building) in a robust way. This is i
 llustrated by means of two examples: vibration mitigation of an urban tram
 way on soft soils by means of a (floating) slab track supported by piled f
 oundations\, and the use of seismic metamaterials as a vibration mitigatio
 n measure on the transmission path.\nThese applications all require detail
 ed vibration prediction models that are fast to run. We therefore also inv
 estigate the potential of model order reduction techniques to tackle the 
 “curse of dimensionality” and considerably speed-up state-of-the-art p
 rediction models.\n
LOCATION:Department of Engineering - LT2
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