Searched for: subject:"sound%5C+transmission"
(1 - 8 of 8)
document
Vogel, I. (author), Brug, J. (author), Hosli, E.J. (author), van der Ploeg, C.P.B. (author), Raat, H. (author), TNO Kwaliteit van Leven (author)
Objective: To explore adolescents' behaviors and opinions about exposure to loud music from MP3 players. Study design: We conducted a qualitative analysis of focus-group discussions with adolescents aged 12 to 18 years from 2 large secondary schools (1 urban and 1 rural) for pre-vocational and pre-university education. The semi-structured...
article 2008
document
Gerretsen, E. (author), TNO Industrie en Techniek (author)
The standard EN 12354 gives prediction models for the airborne and impact sound transmission between rooms in buildings. For buildings with mainly heavy, monolithic structures the standard has proven to be quite useful. However, in case of lightweight building elements the standard only gives global indications about the appropriate modelling....
conference paper 2006
document
Bron-van der Jagt, G.S. (author), van Beek, P.J.G. (author), van Duin, F. (author), Galanti, F.M.B. (author), Gerretsen, E. (author), Koopman, A. (author), TNO Industrie en Techniek (author)
conference paper 2006
document
Ainslie, M.A. (author), TNO Fysisch en Elektronisch Laboratorium (author)
A rigorous application of the traditional definition of sonar equation terms leads to the appearance of an unexpected factor, not routinely included, equal to the ratio of the characteristic impedance at the receiver to that at the source. An omission of this factor can lead to non-negligible errors for realistic conditions. It is further argued...
article 2004
document
Ainslie, M.A. (author), Robins, A.J. (author), Simons, D.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)
A compilation of analytical formulas is presented, describing ray properties of a family of sediment sound speed profiles. The profiles are described as "generalized power law" profiles because they are generalizations of a similar family of simpler power law profiles considered in earlier work [M. A. Ainslie, J. Acoust. Soc. Am. 96, 2506–2515 ...
article 2004
document
Snellen, M. (author), Simons, D.G. (author), Siderius, M. (author), Sellschopp, J. (author), Nielsen, P.L. (author), TNO Fysisch en Elektronisch Laboratorium (author)
In this article the accuracy of geo-acoustic and geometric parameter estimates obtained through matched field inversion (MFI) was assessed. Multi-frequency MFI was applied to multi-tone data (200-600 Hz) received at a 2-km source/receiver range. The acoustic source was fixed and the signals were received at a vertical array. Simultaneously with...
article 2001
document
Salomons, E.M. (author), Technisch Physische Dienst TNO - TH (author)
Downwind sound propagation over a noise screen is investigated by numerical computations and scale model experiments in a wind tunnel. For the computations, the parabolic equation method is used, with a range-dependent sound-speed profile based on wind-speed profiles measured in the wind tunnel and wind-speed profiles computed with computational...
article 1999
document
Janssens, M.H.A. (author), Thompson, D.J. (author), Technisch Physische Dienst TNO - TH (author)
The sound level of a train crossing a steel railway bridge is usually about 10 dB higher than on plain track. In the Netherlands there are many such bridges which, for practical reasons, cannot be replaced by more intrinsically quiet concrete bridges. A computational model is described for the estimation of noise levels due to a train crossing a...
article 1996
Searched for: subject:"sound%5C+transmission"
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