EP1721310A1 - Amortisseur sonore - Google Patents

Amortisseur sonore

Info

Publication number
EP1721310A1
EP1721310A1 EP05729827A EP05729827A EP1721310A1 EP 1721310 A1 EP1721310 A1 EP 1721310A1 EP 05729827 A EP05729827 A EP 05729827A EP 05729827 A EP05729827 A EP 05729827A EP 1721310 A1 EP1721310 A1 EP 1721310A1
Authority
EP
European Patent Office
Prior art keywords
core
acoustic absorber
bores
cover layer
absorber
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.)
Withdrawn
Application number
EP05729827A
Other languages
German (de)
English (en)
Inventor
Peter Borne
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.)
Valmet Automotive Oy
Original Assignee
Wilhelm Karmann GmbH
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 Wilhelm Karmann GmbH filed Critical Wilhelm Karmann GmbH
Publication of EP1721310A1 publication Critical patent/EP1721310A1/fr
Withdrawn legal-status Critical Current

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

Definitions

  • the invention relates to a device which can be used as an acoustic absorber for damping sound waves, in particular for use in motor vehicles.
  • Nonwovens or foams are currently used as acoustic absorbers, which are on an acoustically non-absorbent carrier, e.g. a carrier made of sheet metal or plastic.
  • a disadvantage of these known acoustic absorbers is that there is a relatively high production outlay because the combination with a support is always required.
  • a device for damping sound waves that is to say the acoustic absorber
  • the cover layer has bores or holes of any contour that extend into the Core enough.
  • Such an acoustic absorber is preferred - but not exclusively - for use in the motor vehicle sector to reduce the there numerous undesirable noises, for example from the chassis or the drive.
  • the invention is based on the knowledge that an oscillating air mass in front of an air volume reactively dampens the causal air movement and that, as a result of the superimposition of the sound waves, extinctions result that an observer perceives as absorption of the sound.
  • a known carrier material which, for reasons of weight, has a cardboard core with a honeycomb structure is provided with holes or bores which extend into this core, ie into the area of the honeycomb. This makes the honeycombs effective for sound absorption. With a large number of such bores in the surface of the carrier material, sound absorption can be achieved which exceeds the absorption properties of the previous, at least two-part absorbers.
  • the advantage of the invention is that the acoustic absorber is in one piece and, in its one-piece design, combines the function of both the acoustic absorber and the previously additionally required carrier. This results in manufacturing Simplifications, because when installing such an acoustic absorber, only a part has to be attached to the motor vehicle, which is also easy to handle due to its rigid structure and its light weight.
  • a core which has a honeycomb structure, so that the cavities of the core are formed by the individual honeycombs.
  • Such a core can be produced particularly easily if a sandwich structure consisting of cardboard in a honeycomb structure, that is to say a honeycomb structure that results from a large number of corrugated cardboard layers or the like, is used as the core.
  • the latter has a cover layer which comprises glass fiber and a PU material which connects the cover layer to the core in a cohesive manner.
  • the combination of core and cover layer, especially the material connection, is an optimal workpiece in terms of weight on the one hand and stability on the other.
  • the acoustic absorber can be manufactured in almost any desired shape, taking special contours into account if necessary. be done. Due to special surface contours, it is possible for such an absorber to be fitted precisely into certain recesses and cavities in a motor vehicle body, for example inside a motor vehicle door, below the bonnet.
  • the acoustic absorber can support the stability of the body at such points or serve as an assembly support for, for example, window regulators including drive. Due to its stability, especially due to the fact that the absorber forms a self-supporting component, it can also be used instead of carriers previously used in motor vehicles such as hat racks, door panels, spare wheel wells, cargo space covers, convertible top compartment covers or instead of many to separate individual sections of the vehicle, such as the passenger compartment and trunk, used elements are used.
  • the absorber is used in a convertible as a horizontal separation between a space for the covered convertible top and the trunk.
  • the absorber surface is used to dampen the rolling noise.
  • acoustic absorbers opens up when used as the basis for vehicle roofs, in particular movable vehicle roofs.
  • retractable hardtops consist of individual segments which are folded or pushed together when the roof is removed.
  • the bores are regularly or stochastically evenly distributed over the surface of the cover layer.
  • holes with different diameters or holes with different surfaces are provided in the surface of the acoustic absorber.
  • the bores, each with the same diameter are regularly or stochastically distributed over the surface of the cover layer.
  • the entirety of the bores, each with the same diameter contributes to the absorption of noise at frequencies in the vicinity of a frequency which is maximally absorbed by the respective bore and the cavity below it.
  • the acoustic absorber is not only limited to the automotive sector. An application in their vehicles, for example rail vehicles or aircraft, are also possible. It is also conceivable to use it in the field of building acoustics, for example as a ceiling or wall absorber or as base material for variable partitions in office rooms, acoustic event rooms and the like. Finally, it can also make sense to use it, for example, in furniture, for example when it is a matter of specifically dampening certain interfering noises in living rooms, for example from air conditioning or ventilation systems.
  • the surface of the absorber with the holes has an acoustically transparent cover fleece, so that the visual appearance of the vehicle part, which is produced on the basis of such an absorber, is not impaired by the visible openings. This comes for all visible vehicle parts, e.g. the segments of the vehicle roof described. Depending on the flow resistance of the cover fleece, the absorber effect can also be increased.
  • 1 is a schematic perspective view of an acoustic absorber with a core having cavities
  • 2 shows a hole pattern resulting from a totality of holes drilled in a surface of the absorber
  • Fig. 3 is a schematic representation of a cavity in the absorber with a bore that connects the cavity through the bore with the ambient air.
  • the acoustic absorber 10 hereinafter only referred to briefly as absorber 10, comprises a core 11 made of a material 12 having cavities.
  • the core 11 is a honeycomb material 13, e.g. Cardboard with a honeycomb structure.
  • the cavities 12 can be seen in the illustration only in the form of individual honeycombs 14 which are cut in each case.
  • the core 11 has a top and bottom layers 15, 16, respectively.
  • the or each cover layer 15, 16 is a glass fiber layer or the like which, together with a PU material, is bonded to a rigid layer on the one hand in a manner known per se and on the other hand to the core 11.
  • a component results which, due to its layered structure (lower cover layer 15, core 11, upper cover layer 16), is also referred to as a sandwich component or as a sandwich panel.
  • the cover layers 15, 16 and their integral connection with the core 11 result in a light weight and, moreover, in terms of bending stiffness, breaking strength and puncture resistance.
  • Extremely resilient component For use in the automotive sector, it is common for the cover layers 15, 16 to surround the core 11 on all sides, that is to say also in the region of any side surfaces (not shown).
  • the component becomes an acoustic absorber 10 due to bores 17 which are made in at least one of the cover layers 15, 16. So that the acoustic absorber 10 can be effectively used for sound absorption, the surface of the respective cover layer 16 has a large number of such bores 17, which e.g. are evenly or stochastically distributed.
  • FIG. 2 shows the surface of a section of a cover layer 16 of the acoustic absorber 10 provided with bores 17 according to the invention. It can be seen that the surface of the cover layer 16 has the bores 17 in a regular distribution. Due to the cavities 12 (the honeycomb 14) contained in the core 11, when a bore hits such a cavity 12, a volume accessible from the outside due to the respective bore 17 results, the vibrating air column of which is excited by the impinging sound waves and significantly dampens the impinging sound waves.
  • the surface of the cover layer 16 has bores 17 with different diameters. Bores 17 with four different diameters are shown as examples.
  • Diameter of the bores 17 (hereinafter with the shape symbol r) is based on the wavelength of the sound waves to be absorbed according to the following mathematical relationship, where V for the volume of the cavity 12 opened by the respective bore 17, / for the thickness of the cover layer 16, that is to say for the “depth” of the bore 17, c for the speed of sound and / or ( ⁇ for that of the cavity 12 with the maximum sound wave frequency absorbed by the parameters defined by parameters V, l and r.
  • FIG 3 shows, in a sectional illustration of the absorber 10, a single cavity 12, that is to say, for example, a single honeycomb 14 which, through a bore 17 through the upper cover layer 16, is connected to the volume of the ambient air.
  • the sound waves stimulate the air volume in the cavity 12 to vibrate and are completely or partially extinguished by the interaction with this vibration, so that a ne absorption of the sound waves takes place, especially those sound waves in which the respective cavity 12 ensures maximum absorption due to the volume V and the diameter r of the bore 17.
  • an acoustic absorber 10 In practical tests with an acoustic absorber 10 according to the invention, its excellent absorption properties for sound waves have been shown. When used in the motor vehicle sector, undesirable noises essentially arise from the chassis, the drive and from current and wind noises. Such noises and the associated frequency spectrum can be recorded.
  • the acoustic absorber 10 can be optimally designed on the basis of this information. With a fixed thickness of the absorber 10, that is essentially with a fixed thickness of the core 11, the diameters of the individual bores 17 can be matched to the wavelengths of the noise to be absorbed.
  • the thickness of the core 11 is frequently fixed on the basis of predetermined load properties of the absorber 10 on account of its self-supporting property, so that an adaptation of the diameter of the bores 17 is the preferred parameter for matching the absorber 10 to the interference noises.
  • An adjustment of the volume V of the cavities through a changed honeycomb structure or through a change in the thickness of the core 11 can be considered, for example, for optimizations or if a hole pattern (all of the bores 17) results without changing the thickness of the core 11, which only occurs under uneconomical conditions can be established.
  • the number of different diameters of the individual bores 17 also results from the data of the interfering noises.
  • An acoustic absorber 10 is specified which is based on a self-supporting sandwich panel with a core 11 having cavities 12, the core being covered on all sides by a cover layer 15, 16 which consists of a glass fiber material and which is integrally bonded to the core PU material is connected, is surrounded, so that there is an extremely stable plate, which has on one surface, that is in one of the cover layers 15, 16, a plurality of bores 17, each of which has at least individual cavities 12 in the core 11 with the Connect volumes of the ambient air so that sound waves from noise can penetrate them and be absorbed there.
  • the diameter of the bores 17 can be matched to the frequencies of the sound waves to be absorbed, so that a targeted damping of the noise, namely in a frequency range of the noise that can be selected by the diameter of the bores 17, is possible.
  • the Absorber is therefore suitable for frequency-selective damping of the sound pressure level of the background noise.
  • the absorber can also have bores 17 with different diameters, each group of bores 17 with the same diameter damping a frequency range of the noise. Due to its stability, the absorber can replace the absorbers previously used and their respective carriers. In addition to simplifying production, this leads to cost and weight savings.

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)

Abstract

L'invention concerne un amortisseur sonore (10) comprenant un noyau (11) constitué par une matière dotée de cavités (12), ce noyau (11) comportant au moins une couche de couverture (15, 16), laquelle a des orifices (17) qui pénètrent dans le noyau (11).
EP05729827A 2004-02-25 2005-02-11 Amortisseur sonore Withdrawn EP1721310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410009080 DE102004009080B4 (de) 2004-02-25 2004-02-25 Akustischer Absorber
PCT/DE2005/000240 WO2005083676A1 (fr) 2004-02-25 2005-02-11 Amortisseur sonore

Publications (1)

Publication Number Publication Date
EP1721310A1 true EP1721310A1 (fr) 2006-11-15

Family

ID=34877097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05729827A Withdrawn EP1721310A1 (fr) 2004-02-25 2005-02-11 Amortisseur sonore

Country Status (3)

Country Link
EP (1) EP1721310A1 (fr)
DE (1) DE102004009080B4 (fr)
WO (1) WO2005083676A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060169532A1 (en) * 2005-02-03 2006-08-03 Patrick William P Acoustic liner with nonuniform impedance
EP1768100A1 (fr) * 2005-09-22 2007-03-28 USM Holding AG Meuble d'aménagement influant l'acoustique d'une pièce
DE102006042294A1 (de) 2006-09-08 2008-03-27 Dr.Ing.H.C. F. Porsche Ag Bewegliches Fahrzeugdach
FR3001645B1 (fr) 2013-02-06 2015-05-15 Aircelle Sa Tete de percage acoustique
GB2515028A (en) * 2013-06-11 2014-12-17 Rolls Royce Plc An acoustic damper and an engine having an acoustic damper
DE102018202771A1 (de) 2018-02-23 2019-08-29 Bayerische Motoren Werke Aktiengesellschaft Verdeckelement und Verdeck für ein Cabriolet-Fahrzeug und Cabriolet-Fahrzeug
CN111706433B (zh) * 2020-05-11 2022-02-22 中国航发沈阳发动机研究所 一种声衬组合结构
CN114104234B (zh) * 2021-11-30 2023-08-08 浙江大学 覆盖层漫反射式吸声超结构单元及超结构

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2336246A2 (fr) * 1975-02-05 1977-07-22 Roth Sa Freres Procede de fabrication de panneaux en forme a base de carton et de mousse, et panneaux ainsi realises
DE3202594A1 (de) * 1982-01-27 1983-08-11 Ford-Werke AG, 5000 Köln Kraftfahrzeugkarosserie mit einem fest verbundenen dach aus verbundwerkstoff
DE3913255A1 (de) * 1989-04-22 1990-10-25 Brigitte Schmelzle Schalldaemmende abdeckplatte
DE3913347A1 (de) * 1989-04-22 1990-10-25 Stocksmeier Uwe Schallisolierung aus papier
US6182787B1 (en) * 1999-01-12 2001-02-06 General Electric Company Rigid sandwich panel acoustic treatment
GB0016149D0 (en) * 2000-06-30 2000-08-23 Short Brothers Plc A noise attenuation panel
DE20016051U1 (de) * 2000-09-15 2002-02-21 Faist Automotive Gmbh & Co Kg Schallabsorbierende Verbundplatte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005083676A1 *

Also Published As

Publication number Publication date
DE102004009080A1 (de) 2005-09-22
WO2005083676A1 (fr) 2005-09-09
DE102004009080B4 (de) 2006-06-22

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