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Acoustic absorption and reflection as traininterior design elements
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Acoustic comfort in train compartments is discussed in relation to speech intelligibility. Passive acoustic design solutions were developed, resulting in two screen prototypes that use absorption and reflection to lower the level of speech intelligibility. A method of evaluating these prototype's eect on speech intelligibility was developed based on Speech Intelligibility Index (SII) measurements. Measurements were carried out in a train compartment mockup that resembled a 3 m section of a train coach. A computer ray-tracing model of the measurement setup was created in the ODEON ray-tracing software and verifed against the mockup.

Simulations were carried out and compared to the measurement results and the applicability of the ray-tracing model discussed. The measurements and subsequent evaluation according to the method developed here were able to predict the prototype's efect on speech intelligibility and are found to be applicable to other future setups.

Place, publisher, year, edition, pages
2013. , 40 p.
Trita-AVE, ISSN 1651-7660 ; 2013:31
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-136705OAI: diva2:676723
Available from: 2013-12-06 Created: 2013-12-06 Last updated: 2013-12-06Bibliographically approved

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