EP0255473B1 - Verfahren zum Herstellen eines Luftschall absorbierenden Bauelements - Google Patents

Verfahren zum Herstellen eines Luftschall absorbierenden Bauelements Download PDF

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Publication number
EP0255473B1
EP0255473B1 EP87810287A EP87810287A EP0255473B1 EP 0255473 B1 EP0255473 B1 EP 0255473B1 EP 87810287 A EP87810287 A EP 87810287A EP 87810287 A EP87810287 A EP 87810287A EP 0255473 B1 EP0255473 B1 EP 0255473B1
Authority
EP
European Patent Office
Prior art keywords
resonance
protuberances
sound
vibration
element according
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
EP87810287A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0255473A1 (de
Inventor
Alfred Schneider
Hans Rudolf Tschudi
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.)
Matec Holding AG
Original Assignee
Matec Holding AG
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 Matec Holding AG filed Critical Matec Holding AG
Publication of EP0255473A1 publication Critical patent/EP0255473A1/de
Application granted granted Critical
Publication of EP0255473B1 publication Critical patent/EP0255473B1/de
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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y10T428/24537—Parallel ribs and/or grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24661—Forming, or cooperating to form cells

Definitions

  • the present invention relates to a method for producing an airborne sound-absorbing component which has a plurality of cup-shaped protuberances made of compact PVC film or foamed PP film, the cover surfaces of which are effective as resonance surfaces and are excited to vibrate by impacting sound energy, the sound energy being at least partially is absorbed and converted into heat, as well as a component produced by this method and a preferred use of this component.
  • Components of the type described are usually made from a plastic film. They have a dense surface, a low mass and are resistant to most acids, oils, solvents as well as to relatively high temperatures and are therefore preferably used for the absorption of airborne noise in noisy workshops and for lining the housing of noise sources, especially internal combustion engines.
  • the best known embodiments of such components can be assigned to one of two different groups.
  • one group DE-OS 27 58 041
  • the rear openings ie the openings of the protuberances facing away from the incident sound field
  • the rear openings of the protuberances are closed, so that the mass of the vibrating cover surface with the enclosed air forms a physical mass-spring system with a clear resonance frequency.
  • CH 626 936 the rear openings of the protuberances are not closed.
  • the components of both groups are preferably arranged in front of and at a distance from a sound-reflecting wall.
  • the resonance frequency of the cover or resonance surface depends on the shape, size and mass of this surface, on the height of the protuberance and on the mechanical loss factor and the modulus of elasticity of the used material is dependent. Practical experience has confirmed that even relatively small differences in the dimensions of the protuberances severely impair the course of both the sound absorption depending on the frequency of the incident sound and the strength of the sound absorption. Despite these findings, no method for producing such components is known to date which enables the shape and dimensions of the resonance surfaces to be optimized for a given use, taking into account the material properties.
  • the maximum permissible height of the protuberances is often predetermined by the shape and dimensions of the sound source or its cladding and is usually smaller than in the known embodiments mentioned above.
  • the present invention was therefore based on the object of creating a method which enables the production of airborne sound-absorbing components which have optimal absorption properties as a function of the permissible height of the protuberances.
  • the method according to the invention makes it possible to form the values important for effective sound absorption by resonance vibrations, namely the thickness and the size of the resonance surface as a function of the height of the protuberance, and thus to systematically and reproducibly achieve values of sound absorption that have hitherto not been achieved or, at best, at random.
  • FIGS 1a and 1b are not drawn to scale for clarity.
  • the airborne sound absorbing component shown in FIGS. 1a and 1b contains a base area 10, the peripheral edge of which is provided with a stabilizing frame 11.
  • the base area has a plurality of similar truncated pyramidal protuberances, of which simply the protuberance 12 is simply identified by a reference symbol.
  • Each protuberance contains four lateral surfaces 13, 14, 15 and 16 and a cover surface 17.
  • the sizes of the protuberances which are important for the present invention are their height h and the thickness d and the size A of the cover surface which acts as the determining resonance surface. Sound absorption measurements have shown that the horizontal distance between adjacent protuberances and the angle of inclination of the side walls to the base surface have little influence on the course of the sound absorption coefficient depending on the frequency.
  • the protuberances are therefore preferably as close to one another and the side walls are designed to be as slightly inclined as the manufacturing process and practical requirements allow.
  • a plastic film can simply be thermoformed to produce the component. However, it is also possible to manufacture the component in plastic injection molding or to glue or weld protuberances formed from individual sub-areas connected to one another on a carrier film.
  • Suitable plastics are, for example, polyvinyl chloride, polyethylene, polypropylene, acrylonitrile-butadiene-styrene polymer or polycarbonate, which can be used both in compact and in foamed form.
  • the optimal thickness d of the resonance surface becomes smaller as the height h of the protuberance increases.
  • the curves confirm that the thickness d of the resonance surface is within the range of the height h of the protuberance which is important for the practical use of the component, i.e. between 10 and 35 mm is most dependent on this height.
  • the optimal size A of the resonance surface is approximately proportional to the resonance surface thickness d.
  • Curve 30 shows the typical course of the sound level as a function of the frequency for an internal combustion engine (four-stroke gasoline engine) with four cylinders and at idle at about 800 revolutions / minute. It goes without saying that the exact course of this curve is determined not only by the type of engine mentioned, the number of revolutions and the load, but also by specific design features, the operating temperature and other parameters. However, measurements on different motors under different operating conditions have shown that the curve 30 corresponds to an average value. Curve 30 shows that the sound level is low at frequencies up to 1000 Hz, increases with increasing frequencies, reaches the maximum value at 1600 Hz, slowly decreases until around 2500 Hz and rapidly decreases at even higher frequencies.
  • FIG. 4 shows the strength of the sound absorption as a function of the frequency of the incident sound for three different embodiments of airborne sound absorbing components. All three components have truncated pyramid-shaped protuberances on the back, as in the 1a and 1b is shown. In all three embodiments, the plastic foils were deep-drawn in such a way that the side surfaces are inclined by approximately 20 ° from the vertical and the protuberances are 5 mm apart in the plane of the base surface.
  • the height of the protuberances and the size of the resonance surfaces are the same for all three embodiments and are 30 mm and 35 cm2. In these embodiments, the resonance surfaces are rectangular and have an aspect ratio of approximately 0.8: 1.
  • Curve 41 shows the sound absorption of a component made of foamed polyethylene, in which the thickness of the resonance surface is 1.5 mm. This curve rises evenly from values of low sound absorption at low frequencies to a maximum sound absorption corresponding to ⁇ s ⁇ 0.8 at 1000 Hz, then drops only slightly up to frequencies of around 1250 Hz and then drops steeply to ⁇ s up to around 1500 hz ⁇ 0.3.
  • Curve 42 shows the sound absorption of a component made of compact PVC, in which the thickness of the resonance surface is 0.15 mm.
  • the curve begins at higher frequencies than curve 41, rises steeply and reaches a relatively narrow maximum value of ⁇ s ⁇ 0.9 for a frequency of 1000 Hz and then drops steeply again until ⁇ s ⁇ 0.45 at 1500 Hz.
  • Curve 43 shows the sound absorption of a component made of foamed polypropylene, in which the thickness of the resonance surfaces is 3 mm. This curve rises to frequencies of approximately 1250 Hz similar to curve 41, but then continues to rise to a maximum value of more than 0.95 in the frequency range around 1500 Hz and then falls more flatly than curves 41 and 42 and reaches a value of ⁇ s ⁇ 0 , 5 at a frequency of 4000 Hz.
  • the method according to the invention and a component produced using this method can be adapted to special working conditions or uses. It has already been mentioned that instead of the films used for the exemplary embodiments described, other plastic films with similar properties can also be used. It is also possible to design the component differently than the simple plastic film provided with protuberances. For certain uses, it may be advantageous to cover the back of the component with a porous, sound-absorbing material or to insert or put a "cover” of such material in or on the rear openings of the protuberances. It is also possible to produce a combined component with two components of the type described. Of the simple components used for this, one is to be provided with protuberances that are somewhat higher and whose base area is somewhat larger than the other.
  • protuberances enables the components to be placed on one another in such a way that only the webs of the base surfaces arranged between the protuberances lie on one another. Then the overlapping protuberances form a closed and a rearwardly open resonance space, with which the sound absorption and its frequency range can be further improved or expanded. Finally, it is also possible to produce a combined component from more than two components.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP87810287A 1986-05-16 1987-05-07 Verfahren zum Herstellen eines Luftschall absorbierenden Bauelements Expired - Lifetime EP0255473B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2006/86 1986-05-16
CH200686A CH671848B (sv) 1986-05-16 1986-05-16

Publications (2)

Publication Number Publication Date
EP0255473A1 EP0255473A1 (de) 1988-02-03
EP0255473B1 true EP0255473B1 (de) 1992-01-29

Family

ID=4223700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810287A Expired - Lifetime EP0255473B1 (de) 1986-05-16 1987-05-07 Verfahren zum Herstellen eines Luftschall absorbierenden Bauelements

Country Status (9)

Country Link
US (1) US4755416A (sv)
EP (1) EP0255473B1 (sv)
JP (1) JPH0818389B2 (sv)
BR (1) BR8702500A (sv)
CA (1) CA1277922C (sv)
CH (1) CH671848B (sv)
DE (1) DE3776450D1 (sv)
ES (1) ES2030092T3 (sv)
MX (1) MX168844B (sv)

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Publication number Priority date Publication date Assignee Title
US5340054A (en) * 1991-02-20 1994-08-23 The United States Of America As Represented By The Secretary Of The Navy Suppressor of oscillations in airframe cavities
DE4334984C1 (de) * 1993-10-14 1995-01-19 Freudenberg Carl Fa Schall absorbierendes Formteil
DE4414566C2 (de) * 1994-04-27 1997-11-20 Freudenberg Carl Fa Luftschalldämpfer
CA2197439C (en) * 1994-08-12 2006-06-13 Eduard Bruck Sound absorber
US5904318A (en) * 1996-12-18 1999-05-18 Towfiq; Foad Passive reduction of aircraft fuselage noise
US5823467A (en) * 1997-04-01 1998-10-20 Mcdonnell Douglas Corp Passive damping wedge
US6471157B1 (en) * 1999-03-22 2002-10-29 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Device and method for reducing aircraft noise
US6598701B1 (en) * 2000-06-30 2003-07-29 3M Innovative Properties Company Shaped microperforated polymeric film sound absorbers and methods of manufacturing the same
FR2823467B1 (fr) * 2001-04-17 2005-07-15 Sofitec Sa Produit thermoforme pour panneau d'isolation acoustique et/ou thermique
US7434660B2 (en) * 2001-06-21 2008-10-14 Kabushiki Kaisha Kobe Seiko Sho Perforated soundproof structure and method of manufacturing the same
DE10323045A1 (de) * 2003-05-20 2004-12-09 Behr Gmbh & Co. Kg Gehäuse, insbesondere Luftführungsgehäuse und Verfahren zur Herstellung eines solchen
EP1571650B1 (de) * 2004-03-03 2009-05-13 Rolls-Royce Deutschland Ltd & Co KG Anordnung zur Erzeugung von Schallfeldern mit bestimmter modaler Zusammensetzung
JP2007223341A (ja) * 2006-02-21 2007-09-06 Nagoya Oil Chem Co Ltd ドア用シール材
ITRA20100013A1 (it) * 2010-05-04 2011-11-05 Simone Meneghel "pannello fonoisolante frangi-onda"
CN104507797B (zh) * 2012-07-06 2017-11-07 C&D佐迪阿克公司 带有声学材料的飞机内部面板
US9279258B2 (en) * 2013-04-18 2016-03-08 Viconic Defense Inc. Recoiling energy absorbing system with lateral stabilizer
US9194136B2 (en) * 2013-04-18 2015-11-24 Viconic Defense Inc. Recoiling energy absorbing system
KR101655522B1 (ko) * 2014-07-30 2016-09-07 현대자동차주식회사 흡음성능이 우수한 흡차음 보드 부품의 제조방법 및 그에 의해 제조된 흡차음 보드 부품
US10220736B2 (en) 2016-10-25 2019-03-05 Viconic Defense Inc. Seat impact energy absorbing system
US10607589B2 (en) 2016-11-29 2020-03-31 Milliken & Company Nonwoven composite
US10788091B2 (en) 2017-08-22 2020-09-29 Oakwood Energy Management, Inc. Mass-optimized force attenuation system and method
US11585102B2 (en) 2018-11-07 2023-02-21 Viconic Sporting Llc Load distribution and absorption underpayment system
US10982451B2 (en) 2018-11-07 2021-04-20 Viconic Sporting Llc Progressive stage load distribution and absorption underlayment system
JPWO2020162602A1 (ja) * 2019-02-07 2021-12-09 三菱ケミカル株式会社 遮音シート及び遮音構造体
CN112116901B (zh) * 2020-09-18 2024-03-05 北京市燃气集团有限责任公司 一种改善中低压燃气调压箱声学主观评价指标的方法
CN112735368A (zh) * 2020-12-24 2021-04-30 江苏建声影视设备研制有限公司 一种环保型防火吸声板
CN113757817B (zh) * 2021-10-22 2022-11-29 广东美芝制冷设备有限公司 隔声结构、空调室外机及空调器

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US2069413A (en) * 1935-12-06 1937-02-02 Burgess Lab Inc C F Sound and vibration damping construction
US3050426A (en) * 1958-11-21 1962-08-21 Livermore Corp H F Vibration absorbing material and method for making the same
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CH626936A5 (en) * 1980-06-09 1981-12-15 Matec Holding Sound-absorbing structural element
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DE3233654C2 (de) * 1982-09-10 1986-01-16 Ewald Dörken AG, 5804 Herdecke Schallabsorbierendes Bauelement
US4531609A (en) * 1983-08-06 1985-07-30 Midwest Acounst-A-Fiber Sound absorption panel

Also Published As

Publication number Publication date
DE3776450D1 (de) 1992-03-12
MX168844B (es) 1993-06-11
CA1277922C (en) 1990-12-18
JPS6327242A (ja) 1988-02-04
US4755416A (en) 1988-07-05
JPH0818389B2 (ja) 1996-02-28
ES2030092T3 (es) 1992-10-16
BR8702500A (pt) 1988-02-23
CH671848B (sv) 1989-09-29
EP0255473A1 (de) 1988-02-03

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