The Lindeman Hall of Oslo - Evidence of low-frequency radiation from the stage floor
2010 (English)In: 20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society, 2010, 2329-2334 p.Conference paper (Refereed)
It is well known that plate radiation below the critical frequency is very poor, and therefore many stage floors dissipate low-frequency energy transmitted from double-bass and cello end pins rather than providing a tuning-fork/tabletop effect. However, if the stage floor is well damped, so that the transverse amplitudes fade out quickly around the point of excitation, a significant net radiation can be experienced also for low frequencies, due to the piston/baffle effect. Measurements performed in the Lindeman Hall of the Norwegian Academy of Music, in Oslo, Norway, showed that vibrational amplitudes in the stage floor faded out at a nearly equal pace in all directions around the excitation points, leaving nearly circular, quasi isotropic patterns for most frequencies of interest. In the audience area no tendency of spectral roll off was seen in the low-frequency end down to 30 Hz, which may represent the lowest fundamental of modern double basses. Transfer functions from stage floor to audience (intensity vs. power, and sound pressure vs. transverse velocity) were calculated for a number of seats in the hall.
Place, publisher, year, edition, pages
2010. 2329-2334 p.
Critical frequencies, Excitation points, Isotropic patterns, Low-frequency energy, Net radiation, Sound pressures, Transverse velocity, Tuning-fork, Vibrational amplitudes
Computer Science Language Technology (Computational Linguistics)
IdentifiersURN: urn:nbn:se:kth:diva-52255ScopusID: 2-s2.0-84869123096ISBN: 978-161782745-7OAI: oai:DiVA.org:kth-52255DiVA: diva2:465551
20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society; Sydney, NSW; Australia; 23 August 2010 through 27 August 2010
QC 201408142011-12-142011-12-142014-08-14Bibliographically approved