EP2458090A2 - Akustisches Panel für Lärmschutzwände und Lärmschutzwand mit einem solchen Panel - Google Patents

Akustisches Panel für Lärmschutzwände und Lärmschutzwand mit einem solchen Panel Download PDF

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Publication number
EP2458090A2
EP2458090A2 EP11190856A EP11190856A EP2458090A2 EP 2458090 A2 EP2458090 A2 EP 2458090A2 EP 11190856 A EP11190856 A EP 11190856A EP 11190856 A EP11190856 A EP 11190856A EP 2458090 A2 EP2458090 A2 EP 2458090A2
Authority
EP
European Patent Office
Prior art keywords
reverberating
stepped
acoustic
profile
equal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP11190856A
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English (en)
French (fr)
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EP2458090A3 (de
Inventor
federica Bettarello
Marco Caniato
Stefano Pasqualin
Leo Sartor
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Fracasso SpA
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Fracasso SpA
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Publication date
Application filed by Fracasso SpA filed Critical Fracasso SpA
Publication of EP2458090A2 publication Critical patent/EP2458090A2/de
Publication of EP2458090A3 publication Critical patent/EP2458090A3/de
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
    • E01F8/0064—Perforated plate or mesh, e.g. as wall facing
    • E01F8/007—Perforated plate or mesh, e.g. as wall facing with damping material
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
    • E01F8/0076—Cellular, e.g. as wall facing
    • E01F8/0082—Cellular, e.g. as wall facing with damping material

Definitions

  • the present invention relates to an acoustic panel for noise barriers and to a noise barrier provided with such a panel.
  • the present invention relates to a sound-absorbent acoustic panel for noise barriers adapted to obstruct the propagation of polluting acoustic waves in open spaces, to which use explicit reference will be made in the following description without therefore loosing in generality.
  • the propagation of polluting acoustic waves in open spaces is normally controlled by a series of acoustic panels of substantially rectangular shape, which are mounted side-by-side on a specific support frame so as to form a substantially vertical wall, which generally in seamless manner surrounds the polluting acoustic source.
  • the most common sound-absorbent acoustic panels have a rectangular shape and are generally essentially formed by two rigid half-shells made of metallic material, which are essentially shaped as a shallow rectangular bowl and which are reciprocally coupled so as to form a box-like containment of flat parallelepiped shape; and by a layer of rock or glass wool, which completely fills the interspace inside the box-like container.
  • the outer box-like container mainly performs a sound-proofing action, while the filling material mainly performs a sound-absorbent action.
  • the main drawback of the acoustic panels described above is that of not being adaptable, or rather “tuned”, to the features of the polluting acoustic wave, i.e. to the frequency spectrum of the incident acoustic wave, so as to maximize the shielding capacity of the noise barrier.
  • the features of the polluting acoustic wave indeed vary according to the type of polluting acoustic source (moving motor vehicles, moving trains, operating machinery etc.), while in the above-described acoustic panels the attenuation curve of the incident acoustic wave according to frequency has a substantially bell/wave shape which offers very narrow possibility of adjustment/adaptation.
  • an acoustic panel for noise barriers is made as disclosed in claim 1 and preferably, but not necessarily, in any one of the dependent claims.
  • a noise barrier is further made as disclosed in claim 16.
  • numeral 1 indicates as a whole a sound-absorbent acoustic panel, particularly suited for making a noise barrier 2 adapted to obstruct the propagation of polluting acoustic waves in open or closed spaces.
  • the noise barrier 2 is preferably, but not necessarily constituted by a series of acoustic panels 1 of preferably, but not necessarily rectangular shape, which are arranged side-by-side on a support frame 3, so as to form a preferably, but not necessarily vertical shielding frame.
  • the support frame 3 preferably, but not necessarily consists of a base 4 made preferably, but not necessarily of reinforced concrete, and by at least one pair of vertical supporting uprights 5, which overhangingly extend from the base 4 itself, parallel and mutually side-by-side.
  • Each acoustic panel 1 is arranged straddling two consecutive vertical uprights 5 so as to have one of the two faces facing the source of the polluting acoustic waves.
  • the vertical uprights 5 of the support frame 3 preferably, but not necessarily consist of a series of rectilinear metallic profiles 5 with H-shape cross section, which overhangingly extend from the base 4 in vertical direction, and are arranged in pairs parallel and mutually side-by-side, so as to have the longitudinal grooves 5a locally and substantially coplanar with the laying plane of the acoustic panel 1, which is positioned straddling the rectilinear metallic profiles 5 themselves.
  • the rectilinear metallic profiles 5, which form each pair of vertical uprights 5, are reciprocally distanced so that the two vertical side edges of the corresponding central acoustic panel 1 engage the longitudinal grooves 5a of the rectilinear metallic profiles 5 themselves.
  • the acoustic panel 1 has, as mentioned, a preferably, but not necessarily rectangular shape and essentially consists of a reverberating plate 6 of preferably, but not necessarily rectangular shape, which is made of a rigid, compact material having a nominal density higher than 200 kg/m 3 (kilograms per cubic meter), and which has, on one of the two faces, a stepped-profile surface 6a, which is dimensioned so as to reflect at least one incident acoustic wave with predetermined reference frequency or "band center" in "diffused” manner and with destructive interference; and by a layer 7 of sound-absorbent material, which has a peripheral edge that essentially follows the shape of the reverberating plate 6, and is coupled to the reverberating plate 6 so as to completely cover the stepped-profile surface 6a, so as to be crossed by the acoustic wave reflected in "diffused” manner by such a surface.
  • a reverberating plate 6 of preferably, but not necessarily rectangular shape, which
  • the stepped-profile surface 6a is dimensioned to "diffuse" acoustic waves of frequency and intensity different from the incident acoustic wave in all directions; such diffused waves may also cause a destructive interference with the other acoustic waves arriving towards the panel.
  • diffused waves may also cause a destructive interference with the other acoustic waves arriving towards the panel.
  • the layer 7 of sound-absorbent material systematically attenuates the intensity of the reflected acoustic waves working in parallel to the "diffused reflection with destructive interference” phenomenon because it can work for the entire length of the layer itself; the diffusion indeed “distributes” the waves in all directions after the impact of the direct wave, causing a much longer return path (and thus more effective sound-absorption) within the layer itself.
  • the shape of the stepped-profile surface 6a is determined on the basis of the "Quadratic Residue” or “Schroeder's” mathematical model, which was developed by mathematician Manfred SCHROEDER.
  • the number of steps, the width of each step and the distances between the various steps are determined on the bases of the "Quadratic Residue” or “Schroeder's” mathematical model, so as to reflect in "diffused” manner with destructive interference at least one incident acoustic wave having a reference frequency or predetermined "band center”.
  • the reverberating plate 6 has a thickness preferably, but not necessarily comprised between 4 and 50 cm (centimetres), and a nominal density preferably, but not necessarily comprised between 300 and 8000 kg/m 3 (kilograms per cubic meter); while the stepped-profile surface 6a is preferably, but not necessarily shaped so as to copy a Schroeder profile optimized to reflect at least one acoustic wave having reference frequency or "band center” preferably, but not necessarily comprised between 500 and 4000 Hz (Hertz) in "diffused" manner.
  • the stepped-profile surface 6a of the reverberating plate 6 is preferably, but not necessarily optimized according to the "Quadratic Residue" mathematical model, so as to reflect in "diffused” manner at least one first acoustic wave with reference frequency or "band center” preferably, but not necessarily equal to 500 Hz, 1000 Hz, 2000 Hz, or 4000 Hz; and at least one second acoustic wave with reference frequency or "band center” different from that of the first acoustic wave, and preferably, but not necessarily equal to 500 Hz, 1000 Hz, 2000 Hz, or 4000 Hz.
  • the layer 7 of sound-absorbent material has instead a nominal thickness preferably, but not necessarily comprised between 1 and 50 centimetres, and is made with a sound-absorbent material having a nominal density preferably, but not necessarily comprised between 5 and 150 kg/m 3 (kilograms per cubic meter).
  • Such sound-absorbent material further has a porosity preferably, but not necessarily higher than 0.9; and/or a resistivity of the air flow preferably, but not necessarily comprised between 1 and 100 KN/s/m 4 ; and/or an acoustic path greater than 1.
  • the acoustic panel 1 is further preferably, but not necessarily provided with an outer protective half-shell 8 substantially rigid, which is shaped so as to be fitted on the body of the reverberating plate 6, over the sound-absorbent material layer 7, so as to form an interspace which accommodates and at the same time maintains the sound-absorbent material layer 7 abutting on the stepped-profile surface 6a of the reverberating plate 6.
  • the portion of the protective half-shell 8 which is faced/aligned to the stepped-profile surface 6a of the reverberating plate 6, is appropriately pierced so as to make a series of Helmholtz resonators along with the interspace which accommodates the layer 7 made of sound-absorbent material.
  • the reverberating plate 6 has preferably, but not necessarily a normal thickness comprised between 10 and 25 cm (centimetres) and is preferably, but not necessarily made of cement, metal, marble or other compact high density material.
  • the shape of the stepped-profile surface 6a of the reverberating plate 6 is instead preferably, but not necessarily optimized on the basis of the "Quadratic Residue" mathematical model so as to be able to reflect two different incident acoustic waves in "diffused” manner.
  • the reference frequency or "band center" of the first incident acoustic wave is preferably, but not necessarily equal to 1000 Hz (Hertz), while the reference frequency or "band center” of the second incident acoustic wave is preferably, but not necessarily equal to 2000 Hz (Hertz).
  • the reverberating plate 6 preferably, but not necessarily consists of a series of modular reverberating boards or panels 9 of preferably, but not necessarily elongated rectangular shape (two in the illustrated example), which are fixed sideways to one another so as to form single, substantially rigid, indeformable flat body 6.
  • the front face of the reverberating boards or panels 9 is obviously stepped-profiled so to form the stepped-profile surface of the "Quadratic Residue" mathematical model 6a on a same face of the flat body 6.
  • each reverberating panel 9 preferably, but not necessarily consists of a containment basin or framework 10 of elongated regular shape, which has a bottom shaped so as to copy, at least in part, the surface of the stepped-profile surface 6a of the reverberating plate 6, and of a filling core 11, made of concrete, which completely fills the containment basin or framework 10.
  • the reverberating panel 9 may further also comprise a stiffening armature (not shown), either completely or partially embedded in the filling core 11.
  • the containment basin or formwork 10 may be made either of plastic, metal or composite material.
  • the containment basin or formwork 10 may be advantageously made either by means of an injection molding procedure or by means of thermoforming of a sheet of plastic material of suitable thickness.
  • the containment basin or formwork 10 may be advantageously made by means of a cold molding procedure starting from a sheet of suitable thickness.
  • the reverberating plate 6 may be also formed by only one reverberating panel 9 made preferably, but not necessarily with the methods described above.
  • the layer 7 of sound-absorbent material has instead a thickness preferably, but not necessarily comprised between 3 and 15 centimetres, and is made preferably, but not necessarily of open cell polyurethane foam with nominal density preferably, but not necessarily comprised between 30 and 60 kg/m 3 , or other cell material, preferably, but not necessarily open, with sound-absorbent properties.
  • the sound-absorbent material layer 7 made also be made of mineral fiber, either synthetic or natural, with nominal density preferably, but not necessarily comprised between 15 and 45 kg/m 3 .
  • the protective half-shell 8 is instead preferably, but not necessarily made of metal material and essentially consists of a rectangular basin 8 dimensioned to be fitted on the reverberating plate 6.
  • the protective half-shell 8 may be made of plastic or composite material.
  • the bottom of such a basin 8 is further provided with a multitude of through holes so as to form a series of Helmholtz resonators when the basin 8 is coupled to the reverberating plate 6.
  • the protective half-shell 8 may be advantageously made by means of a cold molding procedure starting from a flat or fretted plate of suitable thickness.
  • the shape of the reverberating plate 6 with stepped-profile surface 6a is determined on the basis of "Schroeder's" mathematical model, and in the illustrated example consists of an elementary diffusion profile which is repeated cyclically substantially along the entire face of the reverberating plate 6.
  • the steps which form the elementary diffusion profile generally have a mutually different length, and the spatial distribution of the steps is determined by combining to each other the two elementary diffusion profiles determined directly by "Schroeder's" mathematical model with reference to the two required reference frequencies or "band center".
  • the elementary diffusion profile dimensioned to reflect incident acoustic waves with two different reference frequencies or "band center” in “diffused” manner may be obtained by combining the sequence of the widths of the steps formed by "Schroeder's" mathematical model with reference to the first reference frequency or "band center” with the sequence of distances or heights between the tops of the various steps provided with “Schroeder's” mathematical model with reference to the second reference frequency or "band center”.
  • a single reference frequency or "band center” is fixed to determine the width of the step ( w ), and then the various heights of the steps are calculated according to the different frequency values ( d i ).
  • Figure 4 shows an elementary diffusion profile optimized to reflect the incident acoustic waves with reference frequency or "band center” equal to approximately 1000 Hz (Hertz) in "diffused” manner.
  • Such an elementary diffusion profile preferably, but not necessarily consists of 6 steps, each of which has a length l 1 equal to approximately 17 cm (centimeters). Consequently, the first elementary diffusion profile has a total width l 0 preferably, but not necessarily equal to 102 cm (centimeters).
  • the flat top of the first step a1 lays on the reference plane P of the profile, while the flat top of the second step a2 is positioned behind (under) the reference plane P, at a distance d 2 from the flat top of the first step a1 preferably, but not necessarily equal to approximately 2.45 cm (centimeters).
  • the flat top of the third step a3 is instead positioned in front of (over) the reference plate P, at a distance d 3 from the flat top of the second step a2 preferably, but not necessarily equal to approximately 9.8 cm (centimeters).
  • the flat top of the fourth step a4 is still positioned in front of the reference plane P, but closer to the reference plane P than the flat top of the third step a3, and is at a distance d 4 from the flat top of the fourth step a3 preferably, but not necessarily equal to 4.9 cm (centimeters).
  • the flat top of the fifth step a5 is still positioned in front of the reference plane P, but closer to the reference plane P than the flat top of the fourth step a4, and is at a distance d 5 from the flat top of the fourth step a4 preferably, but not necessarily equal to 4.9 cm (centimeters).
  • the flat top of the sixth and last step a6 is instead positioned behind the reference plane P, at a distance d 6 from the flat top of the fifth step a5 preferably, but not necessarily equal to approximately 9.8 cm (centimetres).
  • the nominal length 11 of each step should be equal to approximately 9.5 cm (centimeters), while the total length 10 of the diffusion profile should be equal to approximately 54 cm (centimeters).
  • the distance d 2 between the flat top of the second step a2 and the second flat of the first step a1 should be equal to approximately 1.23 cm (centimeters); the distance d 3 between the flat top of the third step a3 and the flat top of the second step a2 should be equal to approximately 4.9 cm (centimeter); the distance d 4 between the flat top of the fourth step a4 and the flat top of the third step a3 should be equal to approximately 2.45 cm (centimeters); the distance d 5 between the flat top of the fifth step a5 and the flat top of the fourth step a4 should be equal to approximately 2.45 cm (centimeters); while the distance d 6 between the flat top of the sixth step a6 and the flat top of the fifth step a5 should be equal to approximately 4.9 cm (centimeters).
  • the six-step elementary diffusion profile described above may be used to reflect an incident acoustic wave with reference frequency or "band center” different from 1000 Hz (Hertz) in "diffused” manner, taking the measure of decreasing the nominal widths of the steps and the distances between the flat tops of the various steps in manner reversely proportional to the ratio between the old reference frequency or "band center” (1000 Hz) and the new reference frequency or "band center” of the incident acoustic wave which is reflected in "diffused” manner, leaving substantially unchanged the dimensional ratios between the various portions of the elementary six-step diffusion profile.
  • reference frequency or "band center” different from 1000 Hz (Hertz) in "diffused” manner
  • the elementary diffusion profile could have a number of steps higher than six, providing that the nominal width of the steps and the distances between the various steps comply with the "Quadratic Residue" mathematical model.
  • Figure 5 shows a second elementary diffusion profile optimized to reflect the incident acoustic waves with reference frequency or "band center” equal to approximately 1000 Hz (Hertz) in "diffused” manner, and with reference frequency or "band center” equal to approximately 2000 Hz (Hertz).
  • Such a second elementary profile preferably, but not necessarily consists of 12 steps of different length from each other, and has a total width f 0 preferably, but not necessarily equal to approximately 100.2 cm (centimeter).
  • the flat top of the first step c1 has a width f 1 equal to approximately 15.5 cm (centimeters) and lays on a reference plane P of the profile, while the flat top of the second step c2 has a width f 2 equal to approximately 5.4 cm (centimeters) and is positioned in front (over) the reference plane P, at a distance h 2 from the top of the first step c1 equal to approximately 1.23 cm (centimeters).
  • the flat top of the third step c3 has a width f3 equal to approximately 4.3 cm (centimeters) and lays behind (under) the reference plane P of the profile, at a distance h 3 from the flat top of the second step c2 equal to approximately 4.9 cm (centimeters).
  • the flat top of the fourth step c4 has a width f 4 equal to approximately 3.4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the third step c3, at a distance h 4 from the flat top of the third step c3 equal to approximately 2.45 cm (centimeters).
  • the flat top of the fifth step c5 has a width f 5 equal to approximately 2.7 7 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the fourth step c4, at a distance h 5 from the flat top of the fourth step c4 equal to approximately 2.45 cm (centimeters).
  • the flat top of the sixth step c6 has instead a width f 6 equal to approximately 2.1 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance h 6 from the flat top of the fifth step c5 equal to approximately 4.9 cm (centimeters).
  • the flat top of the seventh step c7 has instead a width f 7 equal to approximately 30.9 cm (centimeters) and lays substantially on the reference plane P of the profile, at a distance h 7 from the flat top of the sixth step c6 equal to approximately 1.23 cm (centimeters).
  • the flat top of the eighth step c8 has instead a width f 8 equal to approximately 10.7 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance h 8 from the flat top of the seventh step c7 equal to approximately 1.23 cm (centimeters).
  • the flat top of the ninth step c9 has instead a width f 9 equal to approximately 8.6 cm (centimeters) and lays behind (under) the reference plane P of the profile, at a distance h 9 from the flat top of the eighth step c8 equal to approximately 4.9 cm (centimeters).
  • the flat top of the tenth step c10 has a width f 10 equal to approximately 6.9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the ninth step c9, at a distance h 10 from the flat top of the ninth step c9 equal to approximately 2.45 cm (centimeters).
  • the flat top of the eleventh step c11 has a width f 11 equal to approximately 5.4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but further from the reference plane P than the flat top of the tenth step c10, at a distance h 11 from the flat top of the tenth step c10 equal to approximately 2.45 cm (centimeters).
  • the flat top of the twelfth step c12 has a width f 12 equal to approximately 4.3 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance h 12 from the flat top of the eleventh step c 11 equal to approximately 4.9 cm (centimeters).
  • Figure 6 instead, shows a third elementary diffusion profile optimized to reflect the incident acoustic waves with reference frequency or "band center” equal to approximately 1000 Hz (Hertz) in "diffused” manner, and with reference frequency or “band center” equal to approximately 2000 Hz (Hertz).
  • Such a third elementary profile again consists of 12 steps of mutually different length, and has a total width w 0 preferably, but not necessarily equal to approximately 100.2 cm (centimeters).
  • the flat top of the first step e1 has a width w 1 equal to approximately 30.9 cm (centimeters) and lays on a reference plane P of the profile, while the flat top of the second step e2 has a width w 2 equal to approximately 10.7 cm (centimeters) and is positioned in front (over) the reference plane P, at a distance k 2 from the flat top of the first step e1 equal to approximately 2.45 cm (centimeters).
  • the flat top of the third step e3 has instead a width W3 equal to approximately 8.6 cm (centimeters) and lays behind (under) the reference plane P of the profile, at a distance k 3 from the flat top of the second step e2 equal to approximately 9.8 cm (centimeters).
  • the flat top of the fourth step e4 has a width W4 equal to approximately 6.9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the third step e3, at a distance k 4 from the flat top of the third step e3 equal to approximately 4.9 cm (centimeters).
  • the flat top of the fifth step e5 has a width w 5 equal to approximately 5.4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the fourth step w 4 , at a distance k 5 from the flat top of the fourth step e4 equal to approximately 4.9 cm (centimeters).
  • the flat top of the sixth step e6 has instead a width w 6 equal to approximately 4.3 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance k 6 from the flat top of the fifth step e5 equal to approximately 9.8 cm (centimeters).
  • the flat top of the seventh step e7 has a width w 7 equal to approximately 15.5 cm (centimeters) and lays substantially on the reference plane P of the profile, at a distance k 7 from the flat top of the sixth step e6 equal to approximately 2.45 cm (centimeters).
  • the flat top of the eighth step e8 has instead a width w 8 equal to approximately 5.4 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance k 8 from the flat top of the seventh step e7 equal to approximately 1.23 cm (centimeters).
  • the flat top of the ninth step e9 has a width w 9 equal to approximately 4.3 cm (centimeters) and lays behind (under) the reference plane P of the profile, at a distance k 9 from the flat top of the eighth step e8 equal to approximately 4.9 cm (centimeters).
  • the flat top of the tenth step e10 has a width w 10 equal to approximately 3.4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the ninth step e9, at a distance k 10 from the flat top of the ninth step e9 equal to approximately 2.45 cm (centimeters).
  • the flat top of the eleventh step e 11 has a width w 11 equal to approximately 2.7 cm (centimeters) and lays behind (under) the reference plane P of the profile, but further from the reference plane P than the flat top of the tenth step e10, at a distance k 11 from the flat top of the tenth step e10 equal to approximately 2.45 cm (centimeters).
  • the flat top of the twelfth step e12 has a width w 12 equal to approximately 2.1 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance k 12 from the flat top of the eleventh step e11 equal to approximately 4.9 cm (centimeters).
  • figure 7 shows a fourth elementary diffusion profile optimized to reflect the incident acoustic waves with reference frequency or "band center” equal to approximately 2000 Hz (Hertz) in "diffused” manner, and with reference frequency or “band center” equal to approximately 4000 Hz (Hertz).
  • this fourth elementary diffusion profile consists of 12 steps which, in this case, have length alternatively equal to approximately 9 cm (centimeters) or approximately 4 cm (centimeters), and has a total length m 0 preferably, but not necessarily equal to approximately 78 cm (centimeters).
  • the flat top of the first step b1 has a width m 1 equal to approximately 9 cm (centimeters) and lays on a reference plane P of the profile
  • the flat top of the second step b2 has a width m 2 equal to approximately 4 cm (centimeters) and is positioned behind (under) the reference plane P, at a distance g 2 from the top of the first step b1 equal to approximately 1.23 cm (centimeters).
  • the flat top of the third step b3 has a width m 3 equal to approximately 9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the second step m2, at a distance g 3 from the flat top of the second step b2 equal to approximately 0.61 cm (centimeters).
  • the flat top of the fourth step b4 has a width m 4 equal to approximately 4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the third step b3, at a distance g 4 from the flat top of the third step b3 equal to approximately 4.9 cm (centimeters).
  • the flat top of the fifth step b5 has a width m 5 equal to approximately 9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the fourth step b4, at a distance g 5 from the flat top of the fourth step b4 equal to approximately 2.45 cm (centimeters).
  • the flat top of the sixth step b6 has a width m 6 equal to approximately 4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but more distant from the reference plane P than the flat top of the fifth step b5, at a distance g 6 from the flat top of the fifth step b5 equal to approximately 2.45 cm (centimeters).
  • the flat top of the seventh step b7 has a width m 7 equal to approximately 9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but closer to the reference plane P than the flat top of the sixth step b6, at a distance g 7 from the flat top of the sixth step b6 equal to approximately 1.23 cm (centimeters).
  • the flat top of the eighth step b8 has a width m 8 equal to approximately 4 cm (centimeters) and lays behind (under) the reference plane P of the profile, but further from the reference plane P than the flat top of the seventh step b7, at a distance g 8 from the flat top of the seventh step b7 equal to approximately 2.45 cm (centimeters).
  • the flat top of the ninth step b9 has a width m 9 equal to approximately 9 cm (centimeters) and lays behind (under) the reference plane P of the profile, but further from the reference plane P than the flat top of the eighth step b8, at a distance g 9 from the flat top of the eighth step g8 equal to approximately 1.23 cm (centimeters).
  • the flat top of the tenth step b10 has a width m 10 equal to approximately 4 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance g 10 from the flat top of the ninth step b9 equal to approximately 4.9 cm (centimeters).
  • the flat top of the eleventh step b11 has instead a width m 11 equal to approximately 9 cm (centimeters) and lays behind (under) the reference plane P of the profile, at a distance g 11 from the flat top of the second step b10 equal to approximately 2.45 cm (centimeters).
  • the flat top of the twelfth step b12 has a width m 12 equal to approximately 4 cm (centimeters) and lays in front of (over) the reference plane P of the profile, at a distance g 12 from the flat top of the eleventh step b11 equal to approximately 1.23 cm (centimeters).
  • the operation of the acoustic panel 1 may be easily inferred from the description above, and thus does not require further explanations except for specifying that in order to obstruct the propagation of the incident acoustic wave, the acoustic panel 1 must be arranged so that the stepped-profile surface 6a of the reverberating plate 6 faces the polluting acoustic source.
  • the reverberating panel or panels 9 forming the reverberating plate 6 are suited to be made directly on-site, by casting the concrete directly into the containment basins or formworks 10, where provided, after having positioned stiffening armatures inside the containment basins or formworks 10.
  • the bottom of the various containment basins or formworks 10 is obviously shaped so as to follow at least one part of the stepped-profile surface 6a of the reverberating plate 6a.
  • the shape of the bottom of the containment basins or formworks 10 consists of one of the elementary diffusion profiles described above, which is cyclically repeated substantially along the entire bottom of the containment basins or formworks 10.
  • the construction of the acoustic panel 1 consists in fixing, if needed, the reverberating panels 9 sideways with respect to one another so as to form the reverberating plate 6; and then positioning the layer 7 of sound-absorbent material on the resulting reverberating plate 6 to cover the respective surface with a stepped-profile surface 6a.
  • the construction of the sound-absorbent panel 1 is then concluded by positioning the protective half-shell 8 on the body of the reverberating plate 6, over the sound-absorbent material layer 7, and subsequently anchoring the protective half-shell 8 onto the body of the reverberating plate 6, so as to block and press the sound-absorbent material layer 7 stably abutting onto the surface of with the stepped-profile surface 6a of the reverberating plate 6.
  • the construction of the acoustic panel 1 may also include removing the containment basins or formworks 10 from the reverberating panel 9 before composing the reverberating plate 6, or before positioning the sound-absorbent material layer 7 to cover the stepped-profile surface 6a of the reverberating plate 6.
  • the reverberating plate 6 will be formed by one or more filling cores 11 made of concrete, fixed sideways to one another.
  • the synergetic effect between "diffused reflection with destructive interference" implemented by the stepped-profile surface 6a and the systematic attenuation of the sound-absorbent material layer 7 allows to block the propagation of acoustic waves in a much more effective manner than the acoustic panels for noise barriers currently in use.
  • the stepped-profile surface 6a of the reverberating plate 6 it is possible to optimize the performance of the acoustic panel 1 and of the noise barrier 2 according to the frequency spectrum of the acoustic waves emitted by the polluting acoustic source to be shielded.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
EP11190856.2A 2010-11-25 2011-11-25 Akustisches Panel für Lärmschutzwände und Lärmschutzwand mit einem solchen Panel Withdrawn EP2458090A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTV2010A000150A IT1402683B1 (it) 2010-11-25 2010-11-25 Pannello acustico per barriere antirumore e barriera antirumore provvista di tale pannello

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EP2458090A2 true EP2458090A2 (de) 2012-05-30
EP2458090A3 EP2458090A3 (de) 2014-03-26

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CN102737627A (zh) * 2012-06-15 2012-10-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
ITPD20130029A1 (it) * 2013-02-11 2014-08-12 Fracasso Spa Pannello multistrato ad uso edilizio
ES2573202A1 (es) * 2014-12-04 2016-06-06 Universidad De Valladolid Panel acústico y barrera acústica
US9702143B2 (en) 2013-10-09 2017-07-11 Stillpoints LLC Acoustic panel
WO2019055241A1 (en) * 2017-09-12 2019-03-21 Schlumberger Technology Corporation SYSTEM AND METHOD FOR NOISE, VIBRATION AND LIGHT POLLUTION MANAGEMENT ON DRILLING DEVICE SYSTEMS
AT522999A1 (de) * 2019-10-01 2021-04-15 Delta Bloc Int Gmbh Schallabsorber
CN112962480A (zh) * 2021-02-01 2021-06-15 浙江广厦建设职业技术大学 一种用于高速公路的3d打印水泥降噪屏障

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102737627A (zh) * 2012-06-15 2012-10-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
CN102737627B (zh) * 2012-06-15 2014-09-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
ITPD20130029A1 (it) * 2013-02-11 2014-08-12 Fracasso Spa Pannello multistrato ad uso edilizio
US9702143B2 (en) 2013-10-09 2017-07-11 Stillpoints LLC Acoustic panel
US10151105B2 (en) 2013-10-09 2018-12-11 Stillpoints LLC Acoustic panel
ES2573202A1 (es) * 2014-12-04 2016-06-06 Universidad De Valladolid Panel acústico y barrera acústica
WO2019055241A1 (en) * 2017-09-12 2019-03-21 Schlumberger Technology Corporation SYSTEM AND METHOD FOR NOISE, VIBRATION AND LIGHT POLLUTION MANAGEMENT ON DRILLING DEVICE SYSTEMS
US10669783B2 (en) 2017-09-12 2020-06-02 Schlumberger Technology Corporation System and method for noise, vibration, and light pollution management on rig systems
AT522999A1 (de) * 2019-10-01 2021-04-15 Delta Bloc Int Gmbh Schallabsorber
CN112962480A (zh) * 2021-02-01 2021-06-15 浙江广厦建设职业技术大学 一种用于高速公路的3d打印水泥降噪屏障

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Publication number Publication date
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IT1402683B1 (it) 2013-09-13
EP2458090A3 (de) 2014-03-26

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