EP0680031B1 - Amortisseur acoustique - Google Patents

Amortisseur acoustique Download PDF

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Publication number
EP0680031B1
EP0680031B1 EP94117818A EP94117818A EP0680031B1 EP 0680031 B1 EP0680031 B1 EP 0680031B1 EP 94117818 A EP94117818 A EP 94117818A EP 94117818 A EP94117818 A EP 94117818A EP 0680031 B1 EP0680031 B1 EP 0680031B1
Authority
EP
European Patent Office
Prior art keywords
airborne
perforated plate
resonators
moulded part
sound
Prior art date
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.)
Expired - Lifetime
Application number
EP94117818A
Other languages
German (de)
English (en)
Other versions
EP0680031A3 (fr
EP0680031A2 (fr
Inventor
Reinhard Stief
Gerhard Dr. Müller-Broll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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 Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0680031A2 publication Critical patent/EP0680031A2/fr
Publication of EP0680031A3 publication Critical patent/EP0680031A3/fr
Application granted granted Critical
Publication of EP0680031B1 publication Critical patent/EP0680031B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to an air silencer, comprising a plate-shaped Molded part made of polymer material with at least two chambers, which act as resonators formed with mutually different resonance frequencies are, the resonators the entire molded part substantially flat cover up.
  • Such a molded part is known from DE 40 11 705 C2.
  • the known one Air silencer comprises an airborne sound-absorbing part that is on its surface facing the sound source is covered with a porous layer or consists of open-cell foam.
  • the resonators of the known Molded parts are designed as Helmholtz resonators, each Helmholtz resonator with only one on the side facing the sound source Breakthrough is provided.
  • the invention has for its object an air silencer of the known Art to develop in such a way that a broadband sound absorption is made possible and that the air silencer in damp and / or Clean air rooms can be used.
  • the molded part consists of a closed cell material that the resonators through essentially pot-shaped protrusions open towards the sound source are formed that the molded part facing the sound source Side is covered by a perforated plate in the area of each chamber is provided with at least two openings and that the molded part and the perforated plate are separably connected.
  • Air silencers can because of its design and good properties can be used in clean air rooms since it does not Material particles from the molded part and / or from the perforated plate to the room air releases and does not absorb moisture. Colonization with bacteria is reliably prevented.
  • the releasable connection of the molding from the perforated plate for example by a clamping system, enables easy cleaning of the entire air silencer.
  • the sound hitting the air silencer first penetrates through the Openings in the perforated plate and stimulate the chamber floor and the side walls of each chamber on bending vibrations. Part of the energy is converted into heat by the internal friction of the molded part material. The remaining part of the energy is generated by the vibrating plugs of air dampened in the perforations of the perforated plate.
  • a chamber of the molded part, which is covered with a multi-perforated perforated plate is therefore enables a comparatively broadband attenuation of impinging Airborne sound. Swing within the perforations in the perforated plate for example air plugs with differing volumes.
  • the Molding consists of a closed-cell foam and the Perforated plate is formed by a perforated plate made of metallic material.
  • the advantage here is that the air silencer does not absorb moisture and can therefore be used in wet or clean air rooms. Of the Air silencer is therefore in the food processing industry and medical fields.
  • the production of a molded part from a closed-cell foam and a perforated metal sheet Material is advantageous in terms of manufacturing technology and economy.
  • the molded part can be the same as resonators of the same design Be provided volume, the perforated plate in the region of the bulge in each case a different number and / or shape of openings having.
  • the chambers With an air silencer designed in this way the chambers have a corresponding bending stiffness. Broadband absorption Airborne sound is achieved through the design of the perforated plate.
  • the volume of the air plugs within the openings is different from one another deviating.
  • the molded part is formed with resonators of differing volume and the Perforated plate in the area of the protrusions each a matching or has a different number and / or shape of openings. It exists the possibility of providing an evenly perforated perforated plate that covers the molded part, which has a different shape with resonators is provided. Due to the different designs of the resonators they can have a different bending stiffness, so that in a frequency range from 250 to 4000 Hz a good broadband Sound absorption is given.
  • the resonators can be designed in this way be that the chamber floor is relatively swingable to the side walls the chamber is arranged.
  • the transition area from the side walls to the chamber floor can be designed as a spring element, the spring element starting from the side walls and the chamber bottom one reduced, continuously merging, membrane-like thin material thickness having.
  • the spring element can roll bellows be trained.
  • Appropriately designed chambers form a spring-mass system, where the spring is trapped by the one inside the chamber Air and formed by the resilient spring element is that in the transition area between the side walls of the chamber and the chamber floor is arranged. The mass is due to the relatively oscillatable Chamber floor formed.
  • the chamber floor resilient the side walls of the chamber are coupled can improve the Sound absorption can be effected in lower frequency ranges.
  • the spring element is preferred is designed like a bellows, causes an oscillating relative movement the chamber floor to the side walls of the chamber only a slight mechanical Flexing stress, in terms of a good service life of the air silencer is of particular advantage.
  • the proportion from the sum of the areas of all Openings in the perforated plate is 0.05 to 0.45.
  • the relationship from the volume of each resonator and the corresponding area of the Openings are preferably 20 to 25. With such a configuration it is advantageous that excellent broadband sound absorption with good mechanical dimensional stability of the entire air silencer given is.
  • the openings are limited in a circle and have a maximum diameter of 4 mm.
  • the openings preferably have a diameter from 1 to 3 mm, the resonators being designed differently from one another are. If the diameter of the openings is less than 4 mm, advantageous that impurities inside the chambers on small particles are limited.
  • the resonators have a cross section widened conically in the direction of the perforated plate. Following its shape, the molded part can be tapered Design of the resonators can be demoulded particularly easily. Through the essentially conical chambers is the drainage of moisture always guaranteed so that no moisture residues, for example, from cleaning the air silencer, within the Resonators remain. The moisture deposits are caused by the Openings in the perforated plate are discharged to the outside. Another enlarged Frequency range for the absorption of airborne sound can be brought about by that the molding on the side facing away from the perforated plate only partially is provided with a heavy layer. The ones with a heavy layer Resonators comparatively improve airborne sound absorption lower frequency vibrations.
  • the air silencer can be used as ceiling and / or wall cladding Wet and / or clean air rooms are used.
  • FIGS. 1 to 4 Several exemplary embodiments of air silencers are shown in FIGS. 1 to 4 shown and are described in more detail below.
  • Fig. 1 is designed as a sound absorbing air silencer Cross section shown.
  • FIG. 2 shows a top view of the air silencer from FIG. 1.
  • Fig. 3 is a section of an air silencer consisting of several Sound absorption elements shown, the sound absorption elements as Ceiling cladding are formed.
  • FIG. 4 shows a section, similar to the section from FIG. 3, wherein different air silencers and a different fastening device apply.
  • FIG. 1 an embodiment of an air silencer is shown, which in essentially of a plate-shaped molded part 1 and a perforated plate 8 consists.
  • the molded part 1 is made of a closed-cell polymeric material manufactured and includes a plurality of chambers 2,3, which act as resonators 4, 5 are formed.
  • the resonators 4, 5 differing volumes and thus differing volumes Resonance frequencies.
  • the resonators 4, 5 are in the direction the sound source 6 open and covered by the perforated plate 8.
  • the perforated plate 8 is in the area of each bulge 7 with a large number of openings 9, 10 provided in connection with the resonators 4, 5 a good Sound absorption in a frequency range of at least 250 to 4000 Hz cause.
  • the molded part 1 and the perforated plate 8 are by a bracket-shaped Fastening device 12 is separably connected to one another.
  • the perforated plate is made of a metallic material and under elastic prestress the molding is created.
  • the perforated plate is in the production-related condition dome-shaped like the resonators. During assembly the perforated plate 8 becomes elastic in a flat state transferred and thereby tightly connected to the molded part 1.
  • FIG. 2 shows a top view of the air silencer from FIG. 1. It it can be seen that the resonators 4, 5 are formed differently from one another are.
  • Fig. 3 is a section of at least two plate-shaped air silencers shown in the area of their circumferential limits the bracket-shaped fastening device 12 are connected to one another.
  • the bracket-shaped fastening device 12 also connects the plate-shaped parts 1 with the adjacent perforated plates 8.
  • Die Resonators 4, 5 are designed differently from one another.
  • the resonator 4 is closed by a perforated plate 8, the openings 9, 10 from each other deviating shape is permeated.
  • the diameter of the openings 9, 10 are 1 to 3 mm.
  • the resonator 5 covered by a perforated plate 8, which has a plurality of identically formed Breakthroughs 9, 10 has.
  • the resonator 5 is a spring-mass system formed, the side walls 13 of the chamber 3 by one piece formed with the resonator 5, bellows-type spring element 14 is connected to the chamber bottom 15.
  • the one facing the sound source In this case, the surface of the perforated plates has a hole percentage of 25% on. On the one hand, this means good sound absorption in a wide frequency range conditional and on the other hand a sufficiently large stiffness of the entire air silencer.
  • the resonator 4 shows an embodiment of one, similar to the embodiment from FIG. 3.
  • the resonator 4 is on the side facing away from the sound source 6 Side with a heavy layer 11 for the absorption of low-frequency vibrations provided in the range up to 500 Hz.
  • the resonator 5 is with one of the side walls 13 by a spring element 14 coupled chamber bottom 15 provided.
  • the air silencers from Fig. 4 are as ceiling cladding provided and by a bracket-shaped fastening device an abutment 16 attached.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Duct Arrangements (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Building Environments (AREA)
  • Exhaust Silencers (AREA)

Claims (10)

  1. Amortisseur de sons aériens, comprenant une pièce de forme en forme de plaque en une matière polymère, comprenant au moins deux chambres qui sont conformées comme des résonateurs présentant des fréquences de résonance qui diffèrent de l'une à l'autre, les résonateurs recouvrant toute la pièce de forme sensiblement à plat, caractérisé en ce que la pièce de forme (1) est constituée par un matériau à alvéoles fermés, en ce que les résonateurs (4, 5) sont formés par des bossages (7) sensiblement en forme de godet, ouverts en direction de la source sonore (6), en ce que, sur le côté dirigé vers la source sonore (6), la pièce de forme (1) est recouverte par une plaque perforée (8) qui est munie d'au moins deux découpures (9, 10) dans la région de chaque chambre (2, 3) et en ce que la pièce de forme (1) et la plaque perforée (8) sont assemblées l'une à l'autre de façon séparable.
  2. Amortisseur de sons aériens selon la revendication 1, caractérisé en ce que la pièce de forme (1) est faite d'une mousse et la plaque perforée (8) est formée d'une tôle perforée en matériau métallique.
  3. Amortisseur de sons aériens selon les revendications 1 à 2, caractérisé en ce que la pièce de forme (1) est munie de résonateurs (4, 5) de même volume, de formes correspondantes, et en ce que la plaque perforée (8) présente des découpures (9, 10) dont le nombre et la configuration varient de l'un à l'autre dans la région des bossages (7).
  4. Amortisseur de sons aériens selon les revendications 1 à 2, caractérisé en ce que la pièce de forme (1) est munie de résonateurs (4, 5) d'un volume qui diffère de l'un à l'autre, et en ce que la plaque perforée (8) présente, dans la région des bossages (7), des découpures (9, 10) qui concordent ou diffèrent en nombre et/ou en forme d'un bossage à un autre.
  5. Amortisseur de sons aériens selon les revendications 1 à 4, caractérisé en ce que la fraction représentée par la somme des surfaces de toutes les découpures (9, 10) de la plaque perforée (8) s'élève de 0,05 à 0,45.
  6. Amortisseur de sons aériens selon les revendications 1 à 5, caractérisé en ce que le rapport du volume de chaque résonateur (4, 5) à la surface correspondante des découpures (9, 10) est de 10 à 30.
  7. Amortisseur de sons aériens selon les revendications 1 à 6, caractérisé en ce que les découpures (9, 10) ont des limites circulaires et présentent un diamètre de 4 mm au maximum.
  8. Amortisseur de sons aériens selon la revendication 1 à 7, caractérisé en ce que les résonateurs (4, 5) présentent une section qui s'agrandit en cône en direction de la plaque perforée (8).
  9. Amortisseur de sons acoustiques selon les revendications 1 à 8, caractérisé en ce que la pièce de forme (1) est munie d'une couche lourde (11) sur le côté qui est à l'opposé de la plaque perforée (8).
  10. Amortisseur de sons acoustiques selon les revendications 1 à 9, caractérisé en ce qu'il est utilisé comme habillage pour des plafonds et/ou des murs.
EP94117818A 1994-04-27 1994-11-11 Amortisseur acoustique Expired - Lifetime EP0680031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4414566 1994-04-27
DE4414566A DE4414566C2 (de) 1994-04-27 1994-04-27 Luftschalldämpfer

Publications (3)

Publication Number Publication Date
EP0680031A2 EP0680031A2 (fr) 1995-11-02
EP0680031A3 EP0680031A3 (fr) 1995-11-15
EP0680031B1 true EP0680031B1 (fr) 1999-06-16

Family

ID=6516487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94117818A Expired - Lifetime EP0680031B1 (fr) 1994-04-27 1994-11-11 Amortisseur acoustique

Country Status (4)

Country Link
US (1) US5587564A (fr)
EP (1) EP0680031B1 (fr)
JP (1) JP2986711B2 (fr)
DE (1) DE4414566C2 (fr)

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JP2815542B2 (ja) * 1994-08-31 1998-10-27 三菱電機ホーム機器株式会社 多孔質構造体を用いた吸音機構
JP2848587B2 (ja) * 1995-10-23 1999-01-20 株式会社神戸製鋼所 吸音性制振形材
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US7395898B2 (en) * 2004-03-05 2008-07-08 Rsm Technologies Limited Sound attenuating structures
PL1607544T3 (pl) * 2004-06-17 2009-08-31 Heimbach Gmbh & Co Kg Urządzenie do akustycznej izolacji wykładziny ściennej, sufitowej lub podłogowej
KR100571539B1 (ko) * 2004-06-30 2006-04-24 김배영 흡음 블록 및 그 시공 방법
US7789193B2 (en) * 2006-04-27 2010-09-07 Masao Suzuki Sound insulating device
US7520370B2 (en) * 2006-05-17 2009-04-21 William Orlin Gudim Combination acoustic diffuser and absorber and method of production thereof
JP5326472B2 (ja) * 2007-10-11 2013-10-30 ヤマハ株式会社 吸音構造
EP2085962A2 (fr) * 2008-02-01 2009-08-05 Yamaha Corporation Structure absorbant les sons et composant de véhicule doté de propriétés absorbant les sons
US20090223738A1 (en) * 2008-02-22 2009-09-10 Yamaha Corporation Sound absorbing structure and vehicle component having sound absorption property
JP5194972B2 (ja) * 2008-04-09 2013-05-08 トヨタ紡織株式会社 防音材
JP5245641B2 (ja) * 2008-08-20 2013-07-24 ヤマハ株式会社 吸音構造体
DE102009034463A1 (de) 2009-07-22 2011-02-03 Filtro Klimatechnik Gmbh Schalldämpfungskörper
US8424637B2 (en) * 2010-01-08 2013-04-23 Richard L. Lenz, Jr. Systems and methods for providing an asymmetric cellular acoustic diffuser
ITRA20100013A1 (it) * 2010-05-04 2011-11-05 Simone Meneghel "pannello fonoisolante frangi-onda"
US9275622B2 (en) * 2011-03-29 2016-03-01 Katholieke Universiteit Leuven Vibro-acoustic attenuation or reduced energy transmission
US9033102B2 (en) * 2011-12-31 2015-05-19 Saint-Gobain Performance Plastics Chaineux Optimized pattern of a damping layer for wall, floor, and ceiling constructions
EP2764509B1 (fr) * 2011-10-06 2021-12-08 HRL Laboratories, LLC Membrane anti-résonante à grande largeur de bande
US8474574B1 (en) * 2012-02-29 2013-07-02 Inoac Corporation Sound absorbing structure
US11021870B1 (en) * 2013-03-14 2021-06-01 Hrl Laboratories, Llc Sound blocking enclosures with antiresonant membranes
WO2014185271A1 (fr) * 2013-05-16 2014-11-20 株式会社トヨックス Élément à rayonnement et membre de conduction thermique
US8857563B1 (en) 2013-07-29 2014-10-14 The Boeing Company Hybrid acoustic barrier and absorber
US8869933B1 (en) * 2013-07-29 2014-10-28 The Boeing Company Acoustic barrier support structure
WO2016026424A1 (fr) * 2014-08-20 2016-02-25 The Hong Kong University Of Science And Technology Dispositif de protection acoustique absorbant les vibrations
GB201415874D0 (en) * 2014-09-08 2014-10-22 Sonobex Ltd Acoustic Attenuator
TWI625446B (zh) * 2015-06-18 2018-06-01 德克薩斯大學體系董事會 用於抑制來自液體中的源的聲能的共振器、共振器陣列和雜訊消減系統
US9630575B2 (en) * 2015-09-30 2017-04-25 GM Global Technology Operations LLC Panel assembly with noise attenuation system
WO2018101164A1 (fr) * 2016-11-29 2018-06-07 富士フイルム株式会社 Structure d'insonorisation
JP6636471B2 (ja) 2017-02-16 2020-01-29 株式会社ニフコ 吸音体、および、吸音構造
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JP2019194743A (ja) * 2019-08-19 2019-11-07 株式会社リコー 電気機器
DE102019128209B4 (de) * 2019-10-18 2023-02-02 Daniel Mohr Schallabsorbierende Vorrichtung mit Noppenfolienverbund und Verwendung
WO2021150567A1 (fr) 2020-01-21 2021-07-29 Adbm Corp. Atténuation simultanée de hautes fréquences et amplification de basses fréquences de sons sous-marins

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Also Published As

Publication number Publication date
JPH0844370A (ja) 1996-02-16
US5587564A (en) 1996-12-24
EP0680031A3 (fr) 1995-11-15
EP0680031A2 (fr) 1995-11-02
DE4414566C2 (de) 1997-11-20
JP2986711B2 (ja) 1999-12-06
DE4414566A1 (de) 1995-11-02

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