WO2020169711A1 - Dispositif d'atténuation acoustique pour un son propagé par des surfaces - Google Patents

Dispositif d'atténuation acoustique pour un son propagé par des surfaces Download PDF

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Publication number
WO2020169711A1
WO2020169711A1 PCT/EP2020/054439 EP2020054439W WO2020169711A1 WO 2020169711 A1 WO2020169711 A1 WO 2020169711A1 EP 2020054439 W EP2020054439 W EP 2020054439W WO 2020169711 A1 WO2020169711 A1 WO 2020169711A1
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic attenuation
attenuation device
sound
layer
acoustic
Prior art date
Application number
PCT/EP2020/054439
Other languages
English (en)
Inventor
Luca D'ALESSANDRO
Stefano CAVERNI
Giovanni CAPELLARI
Francesco Mori
Simone MEDURI
Sebastiano Conti
Original Assignee
Phononic Vibes S.R.L.
Politecnico Di Milano
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Phononic Vibes S.R.L., Politecnico Di Milano filed Critical Phononic Vibes S.R.L.
Priority to EP20705716.7A priority Critical patent/EP3928311B1/fr
Publication of WO2020169711A1 publication Critical patent/WO2020169711A1/fr

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the present invention relates to an acoustic attenuation device for a propagated sound through surfaces, typically characterized by tonal components.
  • the present invention finds wide application in a diversified range of technical fields, for instance in the field of mechanical and electromechanical motors, such as compressors of home devices, automotive or aircraft engines, in the railway field, etc.
  • Acoustics is the branch of physics that studies sound, the pressure waves that cause it, its propagation and its reception.
  • the sound is in particular generated by a source, that is a vibrating body that transmits its vibrations to the medium surrounding it, a medium that may be represented by air, water, metals, concrete or other.
  • a source that is a vibrating body that transmits its vibrations to the medium surrounding it, a medium that may be represented by air, water, metals, concrete or other.
  • the motion of the particles generates the wave and the sound propagates in the form of a sound wave that propagates forming alternating layers of compressed and rarefied air.
  • the railway world is affected, due to the vibrations caused by the transit of vehicles.
  • the area of dividing panels between rooms is clearly affected, in particular those panels with the greatest need for soundproofing such as recording studios.
  • the domestic environment is also affected, for instance due to the noise generated by household appliances.
  • components such as compressors, which are particularly noisy causing annoyance for the user, are adopted.
  • US 9,275,622 B2 discloses a device for vibro-acoustic attenuation and/or for the reduction of the transmitted energy, with a housing structure and at least one mechanical resonator connected thereto, wherein the housing structure comprises a plurality of cavities separated by contiguous walls.
  • US 2,541, 159 A discloses a sound suppressor, which may be directly connected to the vibrating object, comprising a weight and a support for said weight in order to dampen vibrations.
  • a flexible portion is provided in the support, said flexible portion having a substantial mechanical bending hysteresis, namely the ability, when bent, to convert all or a large part of the force required to cause heat bending.
  • US 7,395,898 B2 provides a panel for noise reduction formed by a plurality of cells, with sheets of flexible material and a plurality of weights; the frequency of acoustic attenuation may be controlled through a selection of the masses of these weights.
  • FR 3,056,812 A1 provides a structure for blocking the energy of the acoustic waves comprising a cell support structure and at least one resonant membrane covering a cell of the support structure.
  • the resonant membrane comprises at least one weight and has an anti resonance frequency.
  • CN 103,440,969 A discloses a device comprising an elastic part and a solid metal sphere, the elastic part is fixed on the surface of a transformer and the solid metal sphere is fixed to the end of the elastic part.
  • the device may convert the kinetic energy of the vibration of the transformer into elastic potential energy and thermal energy, in order to reduce the vibration energy of the transformer and to reduce noise emission.
  • KR 100,315,515 B 1 discloses a covering for isolating the noise produced by a compressor using a spring system at the bottom of said covering.
  • the devices disclosed in the prior art still have some drawbacks, which may be represented by a non-perfect insulation, by non-optimal absorbent capacities especially with respect to tonal frequencies, by excessive size of the attenuator device or by excessive construction complexity.
  • An object of the present invention is to overcome the drawbacks of the prior art.
  • a particular object of the present invention is to provide a device allowing an effective attenuation of the sound propagation field.
  • a further particular object of the present invention is to provide a device able to be indifferently applied on a plurality of devices without a particular structural or functional adaptation.
  • Another object is to provide a device that is compact, so as not to particularly affect the overall dimensions of the component or structure which it is applied to, that is robust to be durable over time.
  • An idea underlying the present invention is to provide an acoustic attenuation device for propagated sound through surfaces, the acoustic attenuation device being of the layered type and comprising an innermost connection layer, adapted to associate the acoustic attenuation device with at least one surface.
  • the acoustic attenuation device further comprises an intermediate layer, comprising a plurality of attenuation modules, each of the attenuation modules comprising at least one movable element defined by at least one first opening.
  • the at least one movable element is adapted to vibrate relative to the at least one first opening in a resonant manner when hit by the propagated sound, to attenuate the propagated sound by mechanical dissipation.
  • the acoustic attenuation device further comprises an outermost layer, comprising at least one closure surface defining at least one cavity facing the movable elements and adapted to encapsulate the movable elements of the attenuation modules of the intermediate layer, to further attenuate the propagated sound by sound-absorbing effect.
  • the present solution allows exploiting in a combined and synergistic manner the acoustic attenuation effect by exploiting both the mechanical energy dissipation at the movable element along with a first acoustic attenuation effect given by the first opening, and the sound-absorbing effect of the subsequent cavity, thus ensuring a better insulation in a low insulation thickness.
  • the acoustic attenuation device is particularly advantageous in frequency tonal applications, namely the applications in which the generated sound is very well characterized in terms of frequency of the propagated sound wave.
  • the at least one first opening of each of the attenuation modules defines the at least one movable element preferably surrounding the at least one movable element. This solution allows a sound wave that is evenly incident on the movable element.
  • each of the attenuation modules further comprises a plurality of second openings which put the innermost connection layer in fluid communication with the outermost layer, to further attenuate the propagated sound.
  • the at least one first opening is concave in section and the plurality of second openings individually have convex sections.
  • At least one movable element of the intermediate layer is at least partially hollow inside and comprises at least one entrance hole facing from its inside the innermost layer, so as to further attenuate said propagated sound.
  • the innermost layer comprises an adhesive layer for gluing to the at least one surface.
  • the intermediate layer comprises a support structure for the attenuation modules.
  • Said support structure comprises outer support elements overlaying on the intermediate layer and facing the outermost layer, the movable elements being connected to the outer support elements.
  • the support structure comprises inner support elements facing the innermost layer at the first openings, the movable elements being connected on the inner support elements.
  • the inner support elements define at least two of the first openings, different from each other.
  • This configuration is particularly advantageous for the structural robustness of the intermediate layer and consequently of the entire device.
  • the movable elements are substantially circular or squared.
  • the present invention provides a compressor enclosed in a casing having at least one outer surface, which comprises an acoustic attenuation device according to the invention associated with said at least one outer surface. This application is particularly advantageous and suitable for the structural typology of the component identified as sound source.
  • Figure 1 illustrates an exploded view of an embodiment of the acoustic attenuation device according to the invention
  • Figure 2 illustrates a front view from outside of the intermediate mechanical attenuation layer of the acoustic attenuation device of Figure 1;
  • Figure 3 illustrates a detail of the acoustic attenuation device of Figure 1;
  • Figure 4 illustrates a detail of the acoustic attenuation device of Figure 1;
  • Figure 5 illustrates a detail of an embodiment of the acoustic attenuation device according to the invention
  • Figure 6 illustrates a front view from inside of the intermediate layer of the acoustic attenuation device of Figure 6;
  • Figure 7 illustrates a detail of an embodiment of the acoustic attenuation device according to the invention.
  • Figure 8 illustrates an exploded view of an embodiment of the acoustic attenuation device of the invention
  • Figure 9 illustrates a front view of the intermediate layer of the acoustic attenuation device of Figure 8.
  • Figure 10 illustrates a front view of the intermediate layer of the acoustic attenuation device of a different embodiment of the acoustic attenuation device according to the invention
  • Figure 1 1 illustrates a plane embodiment of the attenuation device according to the invention.
  • reference number 100 wholly indicates an embodiment of an acoustic attenuation device made according to the present invention. As it may be noticed, this embodiment provides a whole cylindrical structure of the device. It is emphasized that this is an exemplifying and not limiting embodiment for the acoustic attenuation device, as it will be explained hereinafter in greater detail.
  • the acoustic attenuation device 100 is of the layered type, in particular comprising at least three layers.
  • the acoustic attenuation device 100 comprises a connection innermost layer 101, adapted to associate the acoustic attenuation device 100 with at least one surface (not shown).
  • the innermost layer 101 may for instance comprise an adhesive layer for gluing to the at least one surface. It is also possible to provide an innermost layer 101 entirely made by said adhesive layer. None prevents from adopting different solutions. For instance, it is possible to provide an innermost laminate layer with magnetic connection elements to be connected to the at least one surface.
  • the acoustic attenuation device 100 further comprises an intermediate layer 102 comprising a plurality of attenuation modules 103. Said layer is adapted to a first attenuation of the propagated sound wave.
  • the acoustic attenuation device 100 further comprises an outermost acoustic attenuation layer 104, comprising at least one closure surface 105. Said layer is adapted to a second attenuation of the propagated sound wave.
  • each of the attenuation modules 103 comprises at least one movable element 201 defined by at least one first opening 202.
  • the first opening 202 surrounds the movable element 201.
  • the movable element is substantially circular, but nothing prevents from adopting different shapes.
  • the first openings 202 are further preferably concave in section. When hit by a propagated sound from a source, the movable element 201 vibrates relative to the first opening 202 in a resonant manner, so as to attenuate the propagated sound by mechanical dissipation.
  • the pressure field defined by the propagated wave that hits the surface of the movable element 201 with normal speed component causes the vibration in a resonant manner of the movable element 201 inside the opening 202 and a subsequent energy absorption from the propagated sound wave.
  • the at least one first opening 202 further acts as an inlet for the acoustic field that propagates towards the subsequent layer, causing the mechanical effect due to the vibration of the movable element to be added to a first purely acoustic attenuation effect.
  • the outermost layer 104 comprising the closure surface 105 is in particular visible.
  • the closure surface 105 defines at least one cavity 301 facing and adapted to encapsulate the movable elements 201 of the attenuation modules 103.
  • the cavity 301 By means of the cavity 301 the propagated sound is attenuated by the sound-absorbing effect.
  • the cavity 301 behaves as a so-called“resonant acoustic cavity”, namely a closed space whose delimitation walls reflect the sound waves that thus remain trapped therein.
  • a support structure For supporting the movable elements 201 inside the first openings 202 a support structure is provided.
  • FIG 4 a support structure formed by a series of outer support elements 401 integrally connected to said movable elements 201 according to the present exemplifying embodiment is visible.
  • the intermediate layer 102 as composed of a perforated sheet 402 on which the outer support elements 401 engage.
  • the outer support elements 401 are overlaying on the intermediate layer 102 and face the outermost layer 104.
  • the outer support elements 401 are cross-shaped, with a central body 403 from which four connection arms 403 depart, at whose ends are connected, preferably integrally, the two movable elements 201 at two opposite ends and two secondary movable elements 405 at the other two ends, with additional attenuation function of the mechanical type.
  • the movable elements 201 are arranged at the openings of the perforated sheet 402, forming the first opening 202.
  • the secondary movable elements 405 may have equal or different shape from the movable elements 201. It is possible to differently arrange movable elements 201 and secondary movable elements 405. It is also possible not to use said secondary movable elements 405 and to provide axial outer support elements 401, with the sole central body 403 and two connection arms 404 with the movable elements 201 at the ends.
  • the perforated sheet 402 may be connected to the various support elements 401 by gluing, welding, magnets, etc., forming together the intermediate layer 102.
  • each of the attenuation modules 103 further comprises a plurality of second openings 501.
  • the second openings 501 are individually convex in section, still more preferably it is micro-holes.
  • the second openings 501 put the innermost layer 101 in fluid communication with the outermost layer 104, to further attenuate the propagated sound. Indeed, the friction generated on the wave passing through the micro-perforated structure causes the transformation of further acoustic energy into heat and an even more effective attenuation by the attenuation device 100.
  • FIG 8 an embodiment providing a different conformation of the intermediate layer 102 is represented.
  • a different shape of movable elements 801 which are substantially squared, is provided. It is herein reiterated that nothing prevents a different conformation, even rectangular, the chosen shapes in the represented embodiments being dictated by simplicity of production.
  • a conformation variation of the movable elements involves a conformation variation of the underlying openings. Any way the intermediate layer 102 comprises a perforated sheet 802 whereon the movable elements 801 are provided.
  • the support structure comprises inner support elements 901 facing the innermost layer 101 at the first openings 202.
  • the movable elements 201 are thus connected overlaying on the inner support elements 901.
  • the inner support elements 901 are cross arranged, dividing the opening of the perforated sheet 802 into four equal sectors, thus generating four first openings 202 equal to each other once the movable elements 801 have been connected overlaying.
  • FIG. 10 An embodiment illustrated in Figure 10 is further provided.
  • said embodiment differs from the previous one in the conformation of the support structure.
  • the inner support elements 901 of the support structure are made in this case of two edges on two sides of each opening of the perforated sheet 802, the edges being integrally connected with the movable element 801.
  • the inner support elements 901 define at least two first openings 202, different from each other.
  • the embodiments herein described in connection with the cylindrical conformation of the acoustic attenuation device 100 are particularly advantageous for the application in the field of compressors.
  • An aspect of the invention is thus directed to a compressor enclosed in a casing having at least one outer surface comprising un acoustic attenuation device according to the invention associated with the at least one outer surface.
  • This application is particularly advantageous and suitable for the structural typology of the component identified as sound source.
  • Figure 1 a possible plane configuration of the acoustic attenuation device 100, particularly suitable for the application in dividing panels for rooms that require particular acoustic soundproofing, is then represented.
  • the layered structured is the same and an intermediate layer 102 may be used according to any one of the above described embodiments.
  • the present invention allows obtaining an excellent sound attenuation, with reduced dimensions, particularly in terms of thickness, and providing various application possibilities without the need for an ad hoc redesign.
  • mechanical and electromechanical motors such as compressors, automotive or aircraft engines, soundproof rooms and any technical field in which it is possible to identify a dividing surface that has to be soundproofed and that divides a sound source from a receiver.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

La présente invention concerne un dispositif d'atténuation acoustique (100) pour un son propagé par des surfaces. Le dispositif d'atténuation acoustique est du type à couches et comprend une couche de liaison la plus à l'intérieur (101), conçue pour associer le dispositif d'atténuation acoustique (100) à au moins une surface. Le dispositif d'atténuation acoustique (100) comprend en outre une couche intermédiaire (102), comprenant plusieurs modules d'atténuation (103), chacun comprenant au moins un élément mobile (201) délimité par au moins une première ouverture (202), ledit élément mobile (201) étant conçu pour vibrer par rapport à ladite première ouverture (202) d'une manière résonante lorsqu'il est frappé par le son propagé pour atténuer le son propagé par dissipation mécanique. Le dispositif d'atténuation acoustique (100) comprend en outre une couche la plus à l'extérieur (104), comprenant au moins une surface de fermeture (105) délimitant au moins une cavité (301) faisant face aux éléments mobiles (201) et étant conçue pour encapsuler les éléments mobiles (201) des modules d'atténuation (103) de la couche intermédiaire (102) pour atténuer davantage le son propagé par effet d'absorption sonore.
PCT/EP2020/054439 2019-02-22 2020-02-20 Dispositif d'atténuation acoustique pour un son propagé par des surfaces WO2020169711A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20705716.7A EP3928311B1 (fr) 2019-02-22 2020-02-20 Dispositif d'atténuation acoustique pour un son propagé par des surfaces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000002569 2019-02-22
IT102019000002569A IT201900002569A1 (it) 2019-02-22 2019-02-22 Dispositivo di attenuazione acustica per suono propagato attraverso superfici

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WO2020169711A1 true WO2020169711A1 (fr) 2020-08-27

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IT (1) IT201900002569A1 (fr)
WO (1) WO2020169711A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11785384B2 (en) 2017-02-09 2023-10-10 The University Of Sussex Acoustic wave manipulation

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541159A (en) 1946-01-22 1951-02-13 Paul H Geiger Sound deadener for vibratory bodies
KR100315515B1 (ko) 1999-04-17 2001-11-30 윤종용 공기조화기의 소음차단장치
US7395898B2 (en) 2004-03-05 2008-07-08 Rsm Technologies Limited Sound attenuating structures
US20110240402A1 (en) * 2010-03-31 2011-10-06 Industrial Technology Research Institute Unit with a sound isolation/vibration isolation structure, array employing the same, and method for fabricating the same
CN103440969A (zh) 2013-08-08 2013-12-11 国家电网公司 一种降低电力变压器噪声排放装置及其方法
US9076429B2 (en) * 2011-01-31 2015-07-07 Wayne State University Acoustic metamaterials
US9275622B2 (en) 2011-03-29 2016-03-01 Katholieke Universiteit Leuven Vibro-acoustic attenuation or reduced energy transmission
FR3056812A1 (fr) 2013-07-29 2018-03-30 The Boeing Company Structure de support de barriere acoustique
WO2018192484A1 (fr) * 2017-04-18 2018-10-25 黄礼范 Structure de matériau acoustique et procédé d'assemblage associé et structure de rayonnement acoustique

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541159A (en) 1946-01-22 1951-02-13 Paul H Geiger Sound deadener for vibratory bodies
KR100315515B1 (ko) 1999-04-17 2001-11-30 윤종용 공기조화기의 소음차단장치
US7395898B2 (en) 2004-03-05 2008-07-08 Rsm Technologies Limited Sound attenuating structures
US20110240402A1 (en) * 2010-03-31 2011-10-06 Industrial Technology Research Institute Unit with a sound isolation/vibration isolation structure, array employing the same, and method for fabricating the same
US9076429B2 (en) * 2011-01-31 2015-07-07 Wayne State University Acoustic metamaterials
US9275622B2 (en) 2011-03-29 2016-03-01 Katholieke Universiteit Leuven Vibro-acoustic attenuation or reduced energy transmission
FR3056812A1 (fr) 2013-07-29 2018-03-30 The Boeing Company Structure de support de barriere acoustique
CN103440969A (zh) 2013-08-08 2013-12-11 国家电网公司 一种降低电力变压器噪声排放装置及其方法
WO2018192484A1 (fr) * 2017-04-18 2018-10-25 黄礼范 Structure de matériau acoustique et procédé d'assemblage associé et structure de rayonnement acoustique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11785384B2 (en) 2017-02-09 2023-10-10 The University Of Sussex Acoustic wave manipulation

Also Published As

Publication number Publication date
EP3928311C0 (fr) 2024-04-17
IT201900002569A1 (it) 2020-08-22
EP3928311B1 (fr) 2024-04-17
EP3928311A1 (fr) 2021-12-29

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