EP0521740A1 - Material zum Schallschutz und ein solches Material enthaltende Vorrichtung - Google Patents

Material zum Schallschutz und ein solches Material enthaltende Vorrichtung Download PDF

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Publication number
EP0521740A1
EP0521740A1 EP92401184A EP92401184A EP0521740A1 EP 0521740 A1 EP0521740 A1 EP 0521740A1 EP 92401184 A EP92401184 A EP 92401184A EP 92401184 A EP92401184 A EP 92401184A EP 0521740 A1 EP0521740 A1 EP 0521740A1
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EP
European Patent Office
Prior art keywords
material according
modulus
sheet
resonators
membrane
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Withdrawn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
EP92401184A
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English (en)
French (fr)
Inventor
Gilles Argy
Gustavo Alcuri
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.)
Hutchinson SA
Original Assignee
Hutchinson SA
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 Hutchinson SA filed Critical Hutchinson SA
Publication of EP0521740A1 publication Critical patent/EP0521740A1/de
Withdrawn legal-status Critical Current

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    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped

Definitions

  • the subject of the invention is an acoustic protection material and a device incorporating such a material.
  • Another approach then consists in carrying out an acoustic correction using absorbent materials added to the partition limiting an enclosure to be protected in order to reduce as much as possible the reverberations of the sound waves on said partition.
  • the reductions in the sound pressure level thus obtained do not, however, make it possible to obtain a sufficient effect to appreciably protect speakers exposed to intense sound sources.
  • the walls of the first type require, to be operative in the low frequency domain (100 to 300 Hz), relatively large resonator volumes, while limiting in this same domain the acoustic corrections obtained with the (necessarily low) ratio of the sum of the surfaces of the necks of the resonators arranged in a wall with the surface of said wall, while if the use of composite walls with volume resonators has proved effective when associated with the wall of materials having a high viscous friction ant, like elastomers, the technique is however of delicate implementation as soon as one seeks to obtain a high acoustic protection in a broad spectrum of sound frequencies.
  • An acoustic protection material against a noise source comprising a substrate and resonators on said substrate is characterized, according to the invention, in that said resonators which are arranged substantially in the direction of greatest extension of the substrate consist of filiform and / or surface elements whose structural characteristics (density, modulus of elasticity, shear modulus, damping factor, piezoelectric factor, etc.), as well as the shape and / or the dimensions are chosen to associate with each resonator a predetermined resonant frequency, on the one hand, and to, on the other hand, absorb at said resonant frequency the sound pressure energy from the noise source and dissipate it in the form mechanical heat energy and / or electrical energy.
  • said resonators which are arranged substantially in the direction of greatest extension of the substrate consist of filiform and / or surface elements whose structural characteristics (density, modulus of elasticity, shear modulus, damping factor, piezoelectric factor, etc.), as well as the shape and / or
  • the substrate is pierced with orifices in or at the edges of which said component elements are embedded.
  • resonators made as vibrating membranes and / or vibrating cords and / or vibrating blades.
  • each resonator is a metal membrane (metal or alloy) and the substrate is a material of the elastomeric type.
  • each resonator is a composite membrane comprising at least two sheets of material with a high elastic modulus and a low damping factor (tg ⁇ ) and a sheet of material with a low shear modulus and a factor high depreciation.
  • the composite membrane is of the sandwich type with external sheets of metal or metal alloy, such as aluminum, with a thickness of between 10 and 200 ⁇ 10 ⁇ 6m enclosing between them a sheet of chosen elastomeric material. to present a damping factor (tg ⁇ ) between 10 ⁇ 2 and 50.10 ⁇ 2 and a thickness between 20 and 500.10 ⁇ 6 ⁇ 6 m
  • the composite membrane is of the sandwich type with external sheets of said elastomeric material and a core constituted by a sheet of metal or metal alloy, such as aluminum, the thicknesses and damping factors being those indicated for the production. sandwich as defined immediately above.
  • the constitutive membrane of the resonator can be circular in outline, but also square, rectangular, elliptical, crescent, etc., or with lobes.
  • the invention plans to take advantage of the number of lobes by which the membrane is embedded peripherally in the substrate for setting the predetermined resonant frequency value.
  • This frequency can also be fixed or adjusted by forming on the membrane one or more network (s) of undulations, the one (s) which (s), by reducing the bending stiffness of the membrane, lowers (s) the frequency of resonance of the latter.
  • This resonant frequency can also be fixed at a predetermined value, -for example by calculation using the finite element method, by practicing openings of variable shape (s) and arrangement (s) in the membrane surface.
  • each resonator embedded in or at the edge of the orifices of the substrate is a filiform element, resulting from the assembly according to strands of fibers with a high modulus of elasticity such as wires or metallic fibers.
  • each resonator is a filiform composite element resulting from the following assembly of strands of fibers of the metallic type and / or of a polymer material having a high modulus of elasticity and which are impregnated with an appropriate quantity of a material with good damping characteristics.
  • the resonators associated with the orifices of the substrate are vibrating plates embedded by one of their ends and constituted by a metallic and / or polymeric material with high elasticity modulus.
  • the resonators are composite vibrating blades comprising a metallic and / or polymeric material with a high elastic modulus and a material with a high damping factor.
  • the invention provides for constituting the substrate in a relatively material flexible, preferably a material of the elastomer or plastomer type.
  • the acoustic protection material according to the invention dissipates the acoustic pressure energy directly in the form of heat
  • the invention also provides for other embodiments , in which the acoustic protection material transforms the energy of acoustic pressure into electrical energy and then dissipates the latter in the form of heat by the Joule effect.
  • the substrate is associated, on the one hand, with sheets of a material of the crystalline or polycrystalline type with piezoelectric properties such as electrical charges appear on the surface of said sheets in response to a sound pressure wave and , on the other hand, very thin conductive electrodes, collecting the electric charges generated to make them pass through electrical resistances or materials with similar properties.
  • the sheets generating electrical charges in response to a sound pressure wave consist of a polymer film of the PVDF type made semi-crystalline by an appropriate thermo-mechanical treatment, the electrodes for collecting electrical charges being produced by thin metallic films, obtained by vacuum metallization on the polymer sheets or, as a variant, by very thin sheets of metal or metal alloy, for example based on aluminum, bonded to said polymer film using an intrinsically conductive adhesive.
  • the invention also relates to an acoustic protection and / or conditioning device characterized in that it consists of a wall comprising at least one layer of the material as defined above.
  • the wall comprises a plurality of layers of said material, said layers being arranged in such a way that the resonators of adjacent layers do not face each other.
  • the invention provides, in addition, that the layers of the device are made of acoustic protection materials which differ from one another by the resonators used, both as regards the shape, the arrangement and / or the nature of the constituent elements. said resonators but also, if necessary, the substrate on which said resonators are formed.
  • a device When the absorbed acoustic pressure energy is transformed into electrical energy, a device according to the invention comprises a multiplicity of layers of the material as defined above, the electrodes of each layer being brought into electrical continuity relation by micro perforations of the sheet generating the electric charges in said layers.
  • the resonance frequency f0 of the membrane is a function of the modulus of elasticity and of the shear modulus of the material which constitutes it and that, for a given resonance frequency and for a membrane radius also given, there is a correlation domain between the moduli of elasticity, shear and the damping factor making it possible to arrive at a preferential value of the energy absorbed by alternation.
  • the membrane 1 is intended to obtain this preferential value to produce the membrane 1 as a metal membrane, that is to say made of metal or metal alloy such as aluminum, copper, alloy steel whose thickness is between 10 and 200.10 ⁇ 6m.
  • the invention provides for making the membrane as a composite membrane of the sandwich type, FIG. 2A, comprising on either side of a core 5, -in a material with low shear modulus (G2) of thickness e2 and with high damping factor (tg ⁇ 2), sheets 6 and 7 of respective thickness e1 and e3, each made of a material with high elasticity modulus (E1 and E3, respectively) and with a low damping factor (tg ⁇ 1 and tg ⁇ 3, respectively).
  • G2 low shear modulus
  • tg ⁇ 2 high damping factor
  • the central core 8 of the composite membrane is made of a material similar to that of the sheets 6 and 7 of the previous embodiment, while the outer sheets 9 and 10 are made of a material similar to that of the core 5 of the embodiment according to FIG. 2A.
  • Sheets 5, 9 and 10 can thus be chosen from sheets based on rubber, on thermoplastic polymer (s) such as polyethylenes, polyvinyl chloride, polyamides or sheets in thermosetting polymer (s) ) based on epoxide (s), phenolic resins, polyurethane, said sheets of elastomer (s) or polymer (s) being, where appropriate, reinforced with a fabric or a non-woven material of glass fibers , polyester fibers, cotton fibers, polyaramide fibers such as those known under the name of KEVLAR (a registered trademark of the company DU PONT DE NEMOURS), metallic films or the like.
  • thermoplastic polymer such as polyethylenes, polyvinyl chloride, polyamides or sheets in thermosetting polymer (s) ) based on epoxide (s), phenolic resins, polyurethane
  • said sheets of elastomer (s) or polymer (s) being, where appropriate, reinforced with a fabric or a non-woven material of
  • the composite membrane is of the type of that shown in FIG. 2A, that is to say with a structure sandwich with a central core 5 ′ analogous to core 5 and external facings 6 ′ and 7 ′, analogous to the facings 6 and 7; in this embodiment, however, the flexural rigidity of the membrane is lowered by one or more network (s) of undulations, 11, making it possible to reduce the resonant frequency f0 when its other dimensional characteristics (radius R, thickness e, characteristics modules ...) are fixed.
  • the invention provides, in addition, to fix the predetermined value of this resonant frequency by giving the membrane 12 a shape with a periphery cut out according to recesses 131 , 132, 133, etc ..., Figure 4, and fix said membrane on the substrate by embedding the edges 141, 142, 143, etc ... of the lobes it has, the number, the shape and the arrangement said lobes being advantageously obtained by calculation, for example by application of the finite element method.
  • This same calculation method can be used to fix or adjust the resonance frequency f0 of the membrane 15 by modifying the surface mass of the latter, most simply by drilling holes 161, 162, 163, ..., figure 5, in form, number and distribution established precisely by calculation.
  • each membrane 1, 12 and 15 of the embodiments described above have been shown with a totally or partially substantially circular external contour, it goes without saying that the invention is not limited to such examples, the apparent contour membranes which can be square, rectangular, elliptical, crescent, etc., on the one hand, while, on the other hand, each membrane can also be partly perforated, or corrugated, or cut into lobes, etc. ..
  • the resonators are constituted by vibrating cords, 20, stretched across orifices 4 drilled in the substrate 2, each cord 20, advantageously constituted by strands of fibers with module d 'high elasticity like metallic fibers or threads, being embedded, at its ends 3, on the edge of the orifice 4.
  • each rope 20 is made up of strands of metallic fibers or of polyester, polyamide or polyaramide fibers, the strands being impregnated with a material having good damping characteristics such as, for example, an elastomer of the type butyl.
  • the resonators of the acoustic protection and / or conditioning material according to the invention consist of vibrating plates 21, embedded at one of their ends 22 in the substrate 2, each plate being advantageously formed in a metal sheet or film of the type of those mentioned above for membrane resonators.
  • the constituent plates of the resonators are formed by a composite of the type of those described above with reference to FIGS. 2 to 5, that is to say by assembling materials of metallic and / or polymeric type chosen according to their characteristics of elastic modulus, shear modulus and damping factor.
  • the substrate 2 exerts an influence on the resonance frequency of said resonators and the corresponding energy absorption.
  • This influence linked to the installation conditions of the resonators, then makes it possible to choose the material of the substrate 2 so that it has damping characteristics which increase the qualities of the material according to the invention.
  • a relatively significant gain in efficiency can be obtained, as shown in FIG. 14, when a support plate pierced with circular orifices with a diameter of about 10 mm is provided with metal membranes, depending on whether the plate is a relatively rigid support or a support made of an elastomeric material.
  • the substrate is of the elastomeric type and the resonators are in the form of membranes, metal blades or cords, the substrate being, in fact, as shown in FIG. 8, it is that is to say formed on a surface S in which are pierced a multiplicity of orifices 4 each of which is provided with a membrane resonator, blade or vibrating cord.
  • FIG. 15 illustrates the response curve to a pink noise excitation of a plate with circular holes of approximately 10 mm in diameter, as defined above, and for which the frequency f0 is of the order of 2100 Hz.
  • the surface S ′ is as shown in FIGS. 8A and 9, that is to say pierced with orifices 4 ′, 4 ⁇ , etc. of different shapes and dimensions
  • the resonators provided on said surface then enter into resonance for excitation frequencies f1, f2, f3, etc. which differ from one another and consequently absorb part of the sound pressure energy from a noise source in discrete bands corresponding to each of said frequencies.
  • the acoustic protection material according to the invention is obtained by fixing to a substrate 2 made from an elastomer or plastomer sheet of thickness between 0.1 and 1 mm, for example calendered then perforated to provide the holes 4 ′, 4 ⁇ , etc. ... a metal sheet 25, the fixing taking place by adhesion or by a similar means so that the zones of the sheet 25 which cover the holes 4 ′, 4 ⁇ , etc ... and which are embedded on their edges form resonators with frequency of different resonances, f1, f2, f3, etc ...
  • the invention provides for constituting the substrate 2 from an elastomer sheet as described above and from a sheet of the type of those described above with reference to FIGS. 2A or 2B and prepared by calendering or extrusion blow molding with regard to its polymeric or elastomeric component, which is then coated with a metal strip or, as a variant, is adhered to such a strip by gluing or the like.
  • the invention proposes to use heating plate presses or "Rotocure" heating cylinder systems as used in the rubber industry or joining the elements together by cold bonding, using structural adhesives, such as epoxy resins or the like, or by melting a film of thermoplastic polymer, etc.
  • the invention provides for overlaying, by joining them together to the others, a multiplicity of layers S1, S2, S3, etc., each of which is of the type shown in FIGS. 8 or 8A, that is to say with substrate 2, pierced with orifices 4, 4 ′ , 4 ⁇ ..., in or at the edges of which the membrane, rope or vibrating blade resonators are embedded.
  • the resonators of each layer are formed by a sheet, 251, for the layer S1, 252 for the layer S2, 253 for the layer S3, etc., and, in order to limit the transmission of sound energy by the effect of continuity of the substrates of each of the adjoining layers, the different layers are offset relative to each other so that the resonators of adjacent layers are not facing each other.
  • This offset may result from a calculation or, alternatively, be obtained by placing the layers S1, S2, S3, etc., in a random manner with respect to each other, so as to provide a device having a capacity of absorption of incident sound energy according to a multiplicity of frequencies.
  • the acoustic protection material according to the invention dissipates the acoustic pressure energy coming from the SO source directly in the form of heat
  • the invention also provides a mode in which the acoustic protection material transforms the energy of acoustic pressure into electrical energy and then dissipates the latter in the form of heat by the Joule effect.
  • a composite element 30, FIG. 11 is first produced from a sheet 31 of a material of the crystalline or polycrystalline type generating, by piezoelectric effect on its faces 32 and 33, electric charges in response to the action on said sheet of an acoustic pressure from a noise source and then it is made integral with said sheet 31 of the conductive electrodes 34 and 35 for collecting said electric charges, electrodes which are arranged on the surfaces 32 and 33, respectively , cause said charges to pass through resistant elements to dissipate electrical energy in the form of heat by the Joule effect.
  • the sheet 31 can be constituted by a polymer film of the PVDF type made semi-crystalline by an appropriate thermo-mechanical treatment or by any other material having similar piezoelectric characteristics, while the electrodes 34 and 35 are advantageously formed by a film of metal or metallic alloy, very fine, obtained by vacuum metallization on the sheet 31 or, as a variant, bonded to said sheet using an intrinsically conductive adhesive.
  • the invention provides for having a composite element 30 on a substrate 2 pierced with orifices 4, 4 ′, 4 ⁇ , ... FIG. 12, thus forming a first layer C1, then superimposing, by joining them, the layers C1, C2, etc., each formed by a substrate and a composite element 30.
  • each substrate 2 is then made conductive to a resistivity value which can be set between 0.1 and 100 Ohm.cm, advantageously by incorporation in an insulating matrix of conductive fillers such as carbon black or metallic powders to give each of the layers C a resistive effect ensuring the dissipation of electrical energy by Joule effect.
  • the invention provides to ensure electrical continuity between the electrodes 34 and 35 attached to the two opposite faces of the sheet 31 to provide micro-perforations 40 in said sheet 40, FIG. 13, so that a conductive polymer material 41, provided for assembling layers C therebetween, simultaneously ensures by the bridges 42 formed in the micro-perforations 40 the electrical continuity between the electrodes 34 and 35.
  • They can also be used for the attenuation of aircraft noise (by fixing plates on the internal walls of the cabin) or of all other land, motor or rail vehicles, as well as for river or sea vehicles, and this by covering noise sources, be they heat engines, exhausts, etc.
  • Such plates can also be used for the covering of noisy machines, the coating of surrounding walls of factories or noisy workshops, and, in general, all buildings for residential or industrial use (such as enclosures enclosing electrical transformers) for which the device according to the invention finds application both for the reduction of noise from adjacent premises and for the protection of buildings against external noise, the latter function also advantageously finding application for the protection of roads or motorways, especially urban .
  • the materials or devices according to the invention also find an advantageous application for the conditioning and / or the acoustic correction of premises, where they are then used by fixing on the walls of said premises to absorb the sound waves reflected on the plates of the devices, thus reducing the noise level and correspondingly increasing the comfort of the users.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP92401184A 1991-04-25 1992-04-24 Material zum Schallschutz und ein solches Material enthaltende Vorrichtung Withdrawn EP0521740A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9105104 1991-04-25
FR9105104 1991-04-25

Publications (1)

Publication Number Publication Date
EP0521740A1 true EP0521740A1 (de) 1993-01-07

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EP92401184A Withdrawn EP0521740A1 (de) 1991-04-25 1992-04-24 Material zum Schallschutz und ein solches Material enthaltende Vorrichtung

Country Status (8)

Country Link
EP (1) EP0521740A1 (de)
JP (1) JPH05150787A (de)
KR (1) KR920020038A (de)
CA (1) CA2067480A1 (de)
CS (1) CS125892A3 (de)
DE (1) DE521740T1 (de)
ES (1) ES2038957T1 (de)
PL (1) PL294336A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651371A2 (de) * 1993-10-30 1995-05-03 Daimler-Benz Aerospace Aktiengesellschaft Schwingungsabsorber zur Körperschalldämpfung
EP0682335A2 (de) * 1994-05-09 1995-11-15 WOCO Franz-Josef Wolf & Co. Lamellenabsorber

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5819731B2 (ja) * 2008-12-23 2015-11-24 スリーエム イノベイティブ プロパティズ カンパニー 運搬用乗物の遮音方法及び装置
GB0901982D0 (en) 2009-02-06 2009-03-11 Univ Loughborough Attenuators, arrangements of attenuators, acoustic barriers and methods for constructing acoustic barriers
US9607600B2 (en) 2009-02-06 2017-03-28 Sonobex Limited Attenuators, arrangements of attenuators, acoustic barriers and methods for constructing acoustic barriers
JP5327616B2 (ja) * 2009-05-27 2013-10-30 株式会社Ｊｖｃケンウッド スピーカユニット
KR101370581B1 (ko) * 2012-07-09 2014-03-06 김선기 멤브레인 어셈블리
US8616330B1 (en) 2012-08-01 2013-12-31 Hrl Laboratories, Llc Actively tunable lightweight acoustic barrier materials

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116303A (en) * 1976-11-08 1978-09-26 Mcdonnell Douglas Corporation Exhaust muffler
DE2834823B1 (de) * 1978-08-09 1979-10-25 Messerschmitt Boelkow Blohm Volumenaendernde Resonatoren nach dem Tellerfeder-Prinzip
GB2027255A (en) * 1978-07-25 1980-02-13 Weltin W E Sound absorbing means
EP0064677A1 (de) * 1981-05-05 1982-11-17 Chemie-Werk Weinsheim Gmbh Mehrschichtiges flächenhaftes Aussteifungsteil
US4373608A (en) * 1979-12-20 1983-02-15 General Electric Company Tuned sound barriers
EP0086184A2 (de) * 1982-02-03 1983-08-17 Krister Amnéus Schalldämpfervorrichtung
DE8903942U1 (de) * 1989-03-31 1989-05-24 Hdw-Isoliertechnik Gmbh, 2300 Kiel, De
EP0316744A2 (de) * 1987-11-13 1989-05-24 Stankiewicz GmbH Schalldämmteil mit Absorptionseigenschaften für Trennwand
US4924976A (en) * 1987-09-04 1990-05-15 Digital Equipment Corporation Tuned array vibration absorber

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116303A (en) * 1976-11-08 1978-09-26 Mcdonnell Douglas Corporation Exhaust muffler
GB2027255A (en) * 1978-07-25 1980-02-13 Weltin W E Sound absorbing means
DE2834823B1 (de) * 1978-08-09 1979-10-25 Messerschmitt Boelkow Blohm Volumenaendernde Resonatoren nach dem Tellerfeder-Prinzip
US4373608A (en) * 1979-12-20 1983-02-15 General Electric Company Tuned sound barriers
EP0064677A1 (de) * 1981-05-05 1982-11-17 Chemie-Werk Weinsheim Gmbh Mehrschichtiges flächenhaftes Aussteifungsteil
EP0086184A2 (de) * 1982-02-03 1983-08-17 Krister Amnéus Schalldämpfervorrichtung
US4924976A (en) * 1987-09-04 1990-05-15 Digital Equipment Corporation Tuned array vibration absorber
EP0316744A2 (de) * 1987-11-13 1989-05-24 Stankiewicz GmbH Schalldämmteil mit Absorptionseigenschaften für Trennwand
DE8903942U1 (de) * 1989-03-31 1989-05-24 Hdw-Isoliertechnik Gmbh, 2300 Kiel, De

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SOVIET PHYSICS: ACOUSTICS, vol. 35, no. 1, janvier/février 1989, pages 91-93, New York, US; K.A. VELIZHANINA et al.: "New resonant sound absorber design for the suppression of low-frequency noise" *
THE JOURNAL OF THE ACOUSTICAL SOC. OF AMERICA, vol. 91, no. 2, février 1992, pages 823-831, Acoustical Soc. of America, NEW YORK, US; T.R. HOWARTH et al.: "Piezocomposite coating for active underwater sound reduction" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651371A2 (de) * 1993-10-30 1995-05-03 Daimler-Benz Aerospace Aktiengesellschaft Schwingungsabsorber zur Körperschalldämpfung
EP0651371A3 (de) * 1993-10-30 1996-02-07 Daimler Benz Aerospace Ag Schwingungsabsorber zur Körperschalldämpfung.
EP0682335A2 (de) * 1994-05-09 1995-11-15 WOCO Franz-Josef Wolf & Co. Lamellenabsorber
EP0682335A3 (de) * 1994-05-09 1998-01-07 WOCO Franz-Josef Wolf & Co. Lamellenabsorber

Also Published As

Publication number Publication date
KR920020038A (ko) 1992-11-20
PL294336A1 (en) 1992-11-30
CA2067480A1 (en) 1992-10-26
DE521740T1 (de) 1993-07-22
JPH05150787A (ja) 1993-06-18
CS125892A3 (en) 1992-12-16
ES2038957T1 (es) 1993-08-16

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