Railway ground vibration prediction using a controlled source; development of an empirical method predicting ground borne vibrations using a falling weight
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Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Sound and vibration (MPSOV), MSc
Publicerad
2024
Författare
Hultén, Hugo
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Rail transport today plays a major role in sustainable transportation. But ground
vibrations from trains and trams create unsustainable environments that lead to
irritation and affect people’s sleep. Several methods are currently used to predict
ground vibrations. These methods are used at different stages of railway design.
Some are more accurate but costly, while others are simpler but less accurate.
In this thesis, a method for predicting ground vibrations from railways is developed.
The method consists of exciting the ground with a controlled source. The controlled
source used is a falling weight. The method is compared with measurements on
maximum weighted vibration level for both trains and trams and for different ground
conditions. To verify the measurements, a numerical analysis is also performed.
Finally, a model is developed using the falling weight ground vibration measurements
to model a point source or a line source of finite length. Comparisons between falling
weight and rail vehicles show that the frequency spectrum differs and that the model
has little resemblance with the mean value of the ground vibrations.The decay with
distance of the maximum vibration level is shown to be similar to that of the rail
ground vibrations when using the point source model rather than modelling a finite
line source.
Beskrivning
Ämne/nyckelord
Tram, Train, Ground vibration, Model, Controlled source, Falling weight, Empirical method, COMSOL