HemOm ossLänkarKonferenserLediga jobbKurserAkustikfaktaKontaktSökLogga inStödmedlemmar
Master's thesis presentations
Boka in i min kalender
Datum16 september 2015
Tid15:00 - 17:00
PlatsChalmers, TA, Sven Hultins gata 8
Dear colleagues, staff and students,

You are all most welcome to Marcus Andersson's and Jens Wässman's Master's thesis presentations.

Wednesday Sept 16th at 15:00
"Estimation of correction factors of railway-induced ground-borne noise from tunnels through rock covered by soil."
Marcus Andersson
Abstract: the text see below.

Wednesday Sept 16th at 16:00
"Mid Frequency Simulation of Cabin Interior."
Jens Wässman
Abstract: the attached pdf.
Mid frequency simulation of cabin interior_abstract (1).pdf
Where: Teaching lab. at the Division of Applied Acoustics, Chalmers, Sven Hultins gata 8A.

Kind regards
Patrik Höstmad

Patrik Höstmad, Associate Professor
Head of the Civil Engineering Program

Division of Applied Acoustics
Chalmers University of Technology
SE – 412 96 Göteborg SWEDEN
Phone: +46 31 772 22 02
Fax: +46 31 772 22 12

Estimation of correction factors of railway-induced ground-borne noise from tunnels through rock covered by soil
Department of Civil and Environmental Engineering

Chalmers University of Technology


Ground-borne noise is an issue in buildings in the proximity of railway tunnels. It is vibrations that are genereated by railway traffic, causing sound radiation in adjacent buildings. The ability to predict ground-borne noise levels is important when planning new tunnels, since the exposure to it can have negative effects on people’s health.

In this thesis, the behaviour of ground-borne noise in soils is studied, mainly through studies of engineering models and simulations in the software Findwave. In the software, a model representing a train tunnel through rock vertically below a one floor building with basement is designed. Between the tunnel and the building is a ground layer, which thickness and material can be varied. The materials studied are: rock, loose and dense sand and clay. The layer thicknesses are 10, 20, 30, 40 and 50 m. The predicted ground-borne noise levels of the soils relative the levels of the rock can serve as correction factors for prediction models developed for wave propagation in rock.

The predicted values turned out to be low in comparison to measured values from Gårdatunneln in Gothenburg. There are some reasons why that might be, for instance the wheel and rail roughness profile used in the simulations. The calculated correction factors range within 0 to 4.2 dB, except for dense sand of 10 m, where the correction is -1.0 dB. This correction is meant to be subtracted, meaning a positive value indicates that the insertion of soil gives more damping than rock.

The validity of these results and their application to other situations are discussed. A comparison with predictions using the Ungar-Bender method shows a significant difference at short distances but more similar results further away. In general, little is known about the application of the results to other situations.

Keywords: ground-borne noise, structure-borne noise, re-radiated noise, wave propagation in ground. 
Uppdaterat 2015-09-12
Utskriftsvänlig sida
Svenska Akustiska Sällskapet, 0705 948142, hans.jonasson@sp.se, PG 320856-8
Provided by Webforum