Acoustics – Sound-modifying means – Sound absorbing fence or screen
Patent
1996-02-15
1999-02-16
Lee, Eddie C.
Acoustics
Sound-modifying means
Sound absorbing fence or screen
181284, 181286, 181290, B64F 126, E04B 182
Patent
active
058723412
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a noise screen adapted to keep down the sound from one side.
Noise screens are generally modular, vertical screens for use in connection with screening and/or absorption of noise/sound coming from outside by traffic installations and work places. It is particularly important that noise screens are soundproof in vertical as well as horizontal direction since any aperture in a noise screen will be penetrated by the noise.
Noise screens are known to appear in several embodiments for outdoor and indoor use in that any tight structure of materials with a weight of over 20 kg/m.sup.2 has a good screening effect.
Noise absorbing screens are also known in several embodiments, for example built up as described in utility model specification DK 93 000 58 U3.
Furthermore, transparent screens are known in embodiments which are screening noise without being absorbing, as described in utility model specification DK 93 00299 U3.
Known noise screens are disadvantageous in that the vertical screen reflects the noise, for example to residents living on the opposite side of the noise source.
However, absorbing screens are known but these screens are disadvantageous in that due to the absorption material it is difficult to make them transparent and thereby they obstruct the view of the residents who are to be protected against a noise source.
It is therefore the object of the present invention to provide a noise screen which, apart from screening the area behind the noise screen from noise/sound, will also absorb the noise and thereby reduce reflections from the noise screen to the area in front of the noise screen.
This object is achieved by a noise screen of the type recited in the introduction, said noise screen according to the invention being characteristic in that the vertical cross section of the noise screen is zigzag-shaped, alternating between absorbing faces and reflecting faces, and that the absorbing faces are arranged on the faces tilting upwards towards the sound side.
Noise, such as noise from work, wheels and traffic, which is to be screened by means of noise screens, is usually emitted from a low height and spreads in a ball-shaped fashion in all directions. When the absorbing screens according to the invention tilt upwards, the absorbing faces thereof will essentially face the noise source and therefore absorb the greater part of same. The noise, which hits the reflecting faces, will be reflected towards the absorbing faces so that a substantial amount of the emitted noise is absorbed by the absorbing faces.
Accordingly, by the noise screen according to the invention there is achieved a substantial improvement of the acoustic properties thereof relative to the known noise screens.
When the reflecting faces are tilted, there is no risk either that they will reflect light from headlights of cars which might cause substantial inconvenience to traffic safety.
Advantageously, the reflecting faces are transparent and therefore provide a high degree of transmitted light, which benefits the residents living behind the noise screen so that they will not feel locked up behind a tight screen, and also assists the orientation of the road-users emitting the noise. The transparent faces also break any feeling of the road-users of driving inside a tunnel when a noise screen of the described kind has been erected on either side of the road.
In other cases, however, it is advantageous that the reflecting faces are non-transparent in view of the privacy of the residents behind the noise screen.
Finally, it is advantageous that the reflecting faces in the height of the noise screen as well as along its length alternate in an arbitrary pattern between transparent and non-transparent faces so that it is possible to break the appearance of the noise screen, which might appear monotonous by a long noise screen.
From an architectural point of view it is advantageous that the noise screen terminates with a transparent, reflecting face at its upper end in that the noise screen will thus provide an im
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Lee Eddie C.
Plinius Erik
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