Change search
ReferencesLink to record
Permanent link

Direct link
Active control for adaptive sound zones in passenger train compartments
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The acoustics in train compartments is an important part of the comfort when travelling. To improve the acoustics, active noise control (ANC) can be used to create local quiet zones at the passenger ear position. In this thesis the fundamental ANC theory is explained and the possibilities and limitations with the technique are identified. An ANC system which uses the virtual microphone technique is implemented and quiet zones are realized at a chair in a train compartment studio. The performance of the ANC system is evaluated with a Styrofoam head model with built in microphones that is used to produce contour plots of the quiet zone shape and attenuation level. The results show that the 10 dB quiet zone is relatively large covering more than a square decimeter in low frequencies and decreases with frequency. Head movements effects are also evaluated and the results show that the system is very sensitive to head movements, especially in higher frequencies. In order to find an optimal positioning of the system components, several experiments have been made. From these it is concluded that varying noise incidence is problematic to some extent. Ways of handling the problems are presented and if the problems were properly dealt with ANC could be an effective way of reducing noise in passenger train compartments.

Place, publisher, year, edition, pages
2013. , 38 p.
TRITA-AVE, ISSN 1651-7660 ; 2013:36
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-143502OAI: diva2:706756
Available from: 2014-03-21 Created: 2014-03-21 Last updated: 2014-03-21Bibliographically approved

Open Access in DiVA

fulltext(1290 kB)355 downloads
File information
File name FULLTEXT01.pdfFile size 1290 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Aeronautical and Vehicle Engineering
Applied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 355 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 75 hits
ReferencesLink to record
Permanent link

Direct link