Road with sound diffractors
Assignee4Silence B.V.
InventorYsbrand Hans Wijnant
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Abstract
The invention relates to a road with at least one traffic lane for motorized vehicular traffic, to which road are added sound attenuating means which limit, at least for determined frequency ranges, the lateral emission of sound caused by traffic travelling over the road, and has the feature that a pattern of resonators placed in distributed manner is arranged at least locally over a chosen length along the traffic lane, which resonators each comprise an acoustically hard, non-absorbing resonance space placed under the surface and debouching in an orifice situated at least roughly at a level of the surface of a roadside edge adjacent to the traffic lane, which resonators have resonance frequencies lying in the range of the frequencies of the sound for attenuating, in particular frequencies around about 1 kHz.
Claims20
A road with at least one traffic lane for motorized vehicular traffic, said road having attenuated lateral emission of sound caused by traffic travelling over the road, comprising,
- plurality of resonators arranged in a pattern distributed at least locally over a chosen length along the at least one traffic lane,
- wherein said resonators each comprise a resonance space placed under a surface adjacent to the at least one traffic lane, and debouching in an orifice situated at least roughly at a level of the surface of a roadside edge adjacent to the at least one traffic lane,
- wherein said resonators have resonance frequencies lying in a range that attenuate a sound produced by traffic travelling along the at least one traffic lane, and
- wherein said resonators are each embodied as a cavity having walls, the walls of which are acoustically substantially non-absorbing and which are free of acoustically absorbing material and absorbant material is not located in the cavity;
- such that diffraction of said sound occurs in a direction differing from the lateral direction.
A road with at least one traffic lane for motorized vehicular traffic, to which road are added sound attenuating means which limit, at least for determined frequency ranges, the lateral emission of sound caused by traffic travelling over the road,
- a pattern of resonators placed in distributed manner is arranged at least locally over a chosen length along the traffic lane,
- which resonators each comprise a resonance space placed under the surface and debouching in an orifice situated at least roughly at a level of the surface of a roadside edge adjacent to the traffic lane, where the orifice has an overall orifice surface area,
- which resonators have resonance frequencies lying in the range of the frequencies of the sound for attenuating, in particular frequencies around about 1 kHz;
- and
- which resonators are each embodied as a cavity,
- wherein the walls of the cavity are acoustically substantially non-absorbing and free of acoustically absorbing material, such that diffraction of said sound occurs in a direction differing from the lateral direction.
Dependencies are inferred from the claim text.