US20150225944A1 - Functional Material for Acoustic Equipment - Google Patents

Functional Material for Acoustic Equipment Download PDF

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Publication number
US20150225944A1
US20150225944A1 US14616503 US201514616503A US2015225944A1 US 20150225944 A1 US20150225944 A1 US 20150225944A1 US 14616503 US14616503 US 14616503 US 201514616503 A US201514616503 A US 201514616503A US 2015225944 A1 US2015225944 A1 US 2015225944A1
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Patent type
Prior art keywords
resin
material
acoustic
filler
equipment
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.)
Abandoned
Application number
US14616503
Inventor
Mitsuru Kobayashi
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Nisshinbo Brake Inc
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Nisshinbo Brake Inc
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Filing date
Publication date

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, 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
    • E04B1/84Sound-absorbing elements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02Macromolecular compounds
    • C04B26/10Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/12Condensation polymers of aldehydes or ketones
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/08Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52Sound-insulating materials
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/002Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/02Casings; Cabinets ; Supports therefor; Mountings therein
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

Abstract

[Object] To provide the functional material for acoustic equipment of this invention made by molding and curing the resin composition consisting of a thermosetting resin and a filler shows superior sound performance to the conventional material.
[Means to Resolve] The functional material for acoustic equipment made by molding the resin composition consisting of the thermosetting resin and the filler, where a specific gravity of the molded material is between 1.5 and 5.0, the porosity of the molded materials is between 2% and 20%, and the average pore size of the materials is between 0.1 μm and 3.0 μm. The resin composition has 5-25 weight % of the thermosetting resin relative to the entire amount of the resin compositions and the filler of the resin composition partially includes 10-35 weight % of the porous filler (preferably having micro porous structure) relative to the entire resin composition.

Description

  • [0001]
    This invention relates to a functional material made by molding a resin composition, which is preferable for a functional material used for an acoustic equipment. This application claims priority to previously filed U.S. Provisional patent application No. 61/938,866 filed on 2014 Apr. 12 and the contents of which is incorporated herewith.
  • BACKGROUND OF THE INVENTION Field of the Invention
  • [0002]
    Generally, as a functional material for acoustic equipment, a material has an internal loss like wood to absorb unnecessary external vibration, and a high rigidity and a high specific gravity to avoid unnecessary resonance of itself due to the external vibration without attenuating necessary vibration.
  • [0003]
    As the material described above, a material made by molding a resin composition consisting of a thermosetting resin and inorganic fillers have been invented.
  • [0004]
    The Patent Document 1 discloses a resin composition to make a material for acoustic equipment by molding that includes a thermosetting resin and an inorganic filler and is characterized that the inorganic filler partially or entirely is in a needle shape with 1-20 μm particle size measured by the sedimentation method.
  • [0005]
    The Patent Document 2 discloses a thermosetting resin composition for acoustic equipment characterized that the filler composed of 60-90 weight % of a heavy calcium carbonate with 250-10 μm particle size and 10-40 weight % of an inorganic powder with 8-0.1 μm particle size are added to a phenol resin in the ratio of 35-80 weight % relative to the entire amount to be mixed, kneaded, and crushed.
  • [0006]
    The Patent Document 3 discloses a resin composition to make a structural material for acoustic equipment by molding characterized that a resin composition includes a thermosetting resin, a curing agent, an inorganic filler, and a fiber reinforcing material and an aromatic polyamide fiber is used for the fiber reinforcing material.
  • [0007]
    The Patent Document 4 discloses a resin composition to make a material for acoustic equipment by molding characterized that a resin composition includes a thermosetting resin and an inorganic filler and that a part or entire inorganic filler is an amorphous inorganic small short fiber.
  • [0008]
    The Patent Document 5 discloses a resin composition to make a material for the acoustic equipment by molding characterized that a resin composition does not include a thermosetting resin and an inorganic filler but a reactive liquid rubber is added therein.
  • [0009]
    These materials have internal losses equal to wood and to rigidity and a specific gravity are high, which are designed to provide a better acoustic property; however, a further development on these materials is on demand.
  • PRIOR ARTS Patent Documents
  • [0010]
    [Patent Document 1] Japanese Provisional Patent Publication No. 1983-53952
  • [0011]
    [Patent Document 2] Japanese Provisional Patent Publication No. 1983-89644
  • [0012]
    [Patent Document 3] Japanese Provisional Patent Publication No. 1983-104949
  • [0013]
    [Patent Document 4] Japanese Provisional Patent Publication No. 1983-215433
  • [0014]
    [Patent Document 5] Japanese Provisional Patent Publication No. 1984-30858
  • SUMMARY OF THE INVENTION Problems to be Resolved by the Invention
  • [0015]
    It is an object of this invention to provide a functional material for acoustic equipment by molding and curing resin compositions, which eliminates unpleasant and uncomfortable low frequency vibration but provides, comparing to the conventional materials, more preferable acousticity such as a comfortable natural sound, high and low sound area expansion, and depth of sound.
  • Means to Resolve the Problems
  • [0016]
    The resin compositions made from such as the thermosetting resin and inorganic filler have innumerable communicating minute pores inside.
  • [0017]
    The inventors diligently investigated, as assuming that the necessary vibration attenuation occurs due to viscous resistance of the air involved in the pores, and found that the functional material for acoustic equipment with more superior acoustic performance than the conventional materials can be obtained by maintaining the porosity of the molded materials and the average pore size within a predetermined range.
  • [0018]
    This invention relates to the functional material for acoustic equipment made by molding the resin compositions suitable for the functional material used for acoustic equipment and is based on the following technology.
  • [0019]
    (1) The functional material for acoustic equipment made by molding the resin compositions composed of the thermosetting resin and filler is such that the specific gravity of the molded material is between 1.5 and 5.0, the porosity is between 2-20%, and the average pore size of 0.1-3 μm.
  • [0020]
    (2) The functional material for acoustic equipment as described in (1), where the above-resin compositions include the thermosetting resin of 5-25 weigh % relative to the entire amount of the resin composition.
  • [0021]
    (3) The functional material for acoustic equipment as described in the above (1) or (2), where the above-resin compositions include the filler partially involving porous filler of 10-35 weight % relative to the entire amount of resin compositions.
  • [0022]
    (4) The functional material for acoustic equipment as described in the above (3), where the porous filler has a micro porous structure.
  • [0023]
    (5) The functional material for acoustic equipment as described in the above (4), where the filler having the micro porous structure is one or more selected from a group of zeolite, activated carbon, porous silica, or porous alumina.
  • ADVANTAGES OF THE INVENTION
  • [0024]
    This invention can provide the functional material for acoustic equipment made by molding and curing the resin compositions composed of the thermosetting resin and the filler that provides more preferable acoustic performance than the conventional materials, such performance including such as maintenance of the preferable moldability, elimination of uncomfortable low frequency vibration, creation of the comfortable natural sound, high and low sound areas expansion, and creation of depth of sound.
  • EMBODIMENTS OF THE INVENTION
  • [0025]
    The functional material for acoustic equipment of this invention is characterized that the functional material is made by molding the resin compositions composed of the thermosetting resin and filler and has the molded material specific gravity of 1.5-5.0, the porosity of 2-20%, and the average pore size of 0.1-3.0 μm.
  • [0026]
    By arranging the specific gravity of the molded material 1.5-5.0, the porosity of the same 2-20%, and the average pore size of the same 0.1-3.0 μm, a chance of attenuating the necessary vibration is eliminated, thereby providing the functional material for acoustic equipment with superior acoustic performance.
  • [0027]
    The specific gravity of the material can be adjusted by selecting the type of the filler to be added to the resin compositions appropriately.
  • [0028]
    The porosity and the average pore size can be adjusted by changing the molding conditions such as the molding temperature, the molding pressure, and the molding time; however, an excessive consideration and examination of the molding conditions are necessary until preferable porosity and average pore size can be obtained.
  • [0029]
    Then, this invention resolved the problem by adding the porous filler of 10-35 weight % relative to the entire amount of the resin compositions as a part of the filler to the resin compositions.
  • [0030]
    By adding the porous filler having innumerable small pores, the molded article with desirable porosity and average pore size can be obtained, without excessive consideration of the molding pressure, by molding at the molding temperature between 130 and 170 centigrade, the molding pressure between 20 and 40 MPa, and the molding time between 2 and 15 minutes.
  • [0031]
    The porous filler can be a porous filler with a micro porous structure at 2 nm or less average pore diameter, a porous filler with a meso-porous structure at more than 2 nm but less than 50 nm average pore diameter, or a porous filler where the porous filler has a micro porous structure at 50 nm or more average pore diameter.
  • [0032]
    By using the porous filler with the micro porous structure, the amount of use of the porous filler is decreased and then flexibility to adjust the amount of addition of other fillers increases, therefore, it becomes easy for favorable thing to adjust the specific gravity.
  • [0033]
    The porous filer with the micro porous structure can be any one of or combination of zeolite, active carbon, porous silica, and porous alumina.
  • [0034]
    The specific gravity in this invention is used the value measured by Pycnometer and Hydrostatic Method, and the porosity and average pore size are used the values measured by Mercury Porosimeter using the test pieces cutting from the functional material for acoustic equipment.
  • [0035]
    The thermosetting resin can be one of or any combination of such as straight phenol resin, modified phenol resin modified by cashew oil, silicone oil, or various elastomers such as acrylic rubber, the aralkyl modified phenol resin formed by reacting phenol compounds, aralkyl ether compounds, and aldehyde compounds, and the thermosetting resin dispersing such as various elastomers and fluorine polymer in the phenol resin.
  • [0036]
    The thermosetting resin in the amount of 5-20 weight % relative to the entire resin compositions is added. If the amount of the thermosetting resin added therein is less than 5 weight %, the molded article tends to be cracked, and if the amount of the thermosetting resin added exceeds 25 weight %, a blister occurs in the molded article.
  • [0037]
    The filler other than the above-described porous filler can be one of or any combination of an organic fiber such as aramid fiber, PAN fiber, and cellulose fiber, an inorganic fiber such as glass fiber and rock wool, an inorganic particle such as calcium carbonate, sulfuric acid, barium, a mica, a talk, a wollastonite, a vermiculite, alumina, silica, zirconia, and zirconium silicate, a carbon particle such as coke and graphite, a rubber particle such as NBR particle and SBR particle, a particle or a short fiber made of metal such as copper, brass, bronze, aluminum, stainless steel, and steel.
  • [0038]
    The functional material for acoustic equipment of this invention is manufactured through steps of mixing the thermosetting resin and filler evenly into the predetermined amount of the resin compositions in a mixer, molding the mixture after placing the mixture in the predetermined shaped thermoforming mold to heat the same at 130-170 centigrade under the pressure of 20-40MPa for 2-15 minutes, and grinding the surface to make the predetermined roughness of the surface. In addition, as necessary, a perforating a bore for screw-engaging with acoustic equipment.
  • EMBODIMENTS
  • [0039]
    The following sections show the embodiments and comparative examples of this invention to concretely explain this invention; however, the following embodiments do not limit the scope of this invention.
  • Embodiments 1-6 and Comparative Examples 1 Manufacturing Method for the Functional Material for Acoustic Equipment
  • [0040]
    The resin compositions with the compositions described in Table 1 is mixed in a Loedige mixer for about 5 minutes, and after the obtained mixture is placed in the thermoforming mold to mold under the conditions described in Table 1, the resulted article is processed to be in 100 mm×55 mm×5 mm to obtain the functional material for acoustic equipment according to the comparative examples 1-5.
  • [0041]
    With respect to the functional material for acoustic equipment in the embodiments 1-6 and the comparative examples 1-5, the evaluation as to the physical property, the moldability, and the acoustic performance are conducted as below. The evaluation result is explained with Table 1.
  • [0042]
    Physical Property Evaluation. Specific gravity is determined by Pycnometer and Hydrostatic Method, and the porosity and the average pore size are determined by the Mercury Porosimeter (Yuasa lonicsCo., Ltd).
  • [0043]
    Moldability Evaluation. Moldability evaluation standard is described as follows:
      • ∘: no crack and blister
      • x: crack and blister
  • [0046]
    Acoustic Performance Evaluation. Acoustic performance evaluation is conducted in the acoustic audio room. The sound facilities include a power amplifier (Esoteric A-03), a D/A converter, an amplifier, a compact disc player (Esoteric K-05), and a large speaker (B&W 801D). The power amplifier, the D/A converter and the speaker that output analog signals and tend to show the sound quality variation easily are three point mounted (right, left, and back center) on the functional material for acoustic equipment according to the embodiments 1-6 and the comparative examples 1-5 are placed under. Here, the functional material is placed separately and independently under the power amplifier, the D/A converter, and the speaker.
  • [0047]
    Evolution points are (1) uncomfortable low frequency vibration by the influence of pores of the material and (2) comfortable natural sound by the influence of the specific gravity of the material relative to the sound frequency resonance in addition to the low pitched tone enhancement, feeling of sound depth, and high pitched tone enhancement.
  • [0048]
    An evaluating music having sound sources with different frequency emphasizing the instruments being used for the total evaluation.
      • Japanese popular music in 1970-1980's (vocal, guitar, bass guitar, and drum: 30 Hz-18 kHz: center 400 Hz-3 kHz)
      • jazz music (piano: 30 Hz-5 kHz: center 200 Hz-1 kHz)
      • classical music (orchestral music: 100 Hz-4 kHz: center 300 Hz-2 kHz)
      • rock music (guitar, bass guitar, drum, keyboard Instrument: 40 Hz-18 kHz: center 100 Hz-1 kHz)
  • [0053]
    Evaluators are selected from a unisex group of 20 people aged between 22 and 62 with different tastes, and the results are based on the average of the evaluators' judges. The valuation basis of the acoustic performance are as follows:
  • [0054]
    ⊚: 15-20 people judge it to be good
  • [0055]
    ∘: 10-14 people judge it to be good
  • [0056]
    Δ: 5-9 people judge it to be good
  • [0057]
    x: 0-4 people judge it to be good
  • [0000]
    TABLE 1
    Embodiments Comparative Examples
    1 2 3 4 5 6 1 2 3 4 5
    Composition Straight phenol 15.0 5.0 25.0 5.0 25.0 15.0 15.0 2.0 30.0 25.0 5.0
    (Weight %) resin
    Aramid pulp 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0
    (ave. fiber
    diameter 1 μm,
    ave. fiber
    length 3 μm)
    Muscovite (ave. 10.0 10.0 10.0 3.0 30.0 10.0 10.0 10.0 10.0 3.0 3.0
    fiber diameter
    10 μm, ave.
    fiber length
    200 μm)
    Brass fiber (ave. 25.0 25.0 20.0 45.0 0.0 25.0 25.0 25.0 25.0 0.0 45.0
    fiber diameter
    150 μm, ave.
    fiber length
    3 μm)
    Cast iron 25.0 20.0 20.0 40.0 0.0 25.0 25.0 25.0 25.0 0.0 45.0
    particle (ave.
    particle
    diameter
    80 μm)
    NBR particle 0.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 70.0 0.0
    (ave. particle
    diameter
    90 μm)
    Active carbon 10.0 10.0 10.0 5.0 35.0 0.0 10.0 10.0 8.0 0.0 0.0
    particle (ave.
    particle
    diameter
    120 μm)
    Zeoite (ave. 0.0 0.0 0.0 0.0 0.0 10.0 0.0 0.0 0.0 0.0 0.0
    particle
    diameter 6 μm)
    Calcium 13.0 23.0 13.0 0.0 8.0 13.0 13.0 26.0 0.0 0.0 0.0
    carbonate (ave.
    particle
    diameter 6 μm)
    Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0
    Molding Molding temp. 150 150 150 150 150 150 130 150 150 150 150
    (° C.)
    Molding 30 30 30 30 30 30 3 30 30 30 30
    pressure (MPa)
    Molding time 8 8 8 8 8 8 8 8 8 8 8
    (minutes)
    Physical Specific gravity 2.9 2.7 2.5 4.3 1.8 2.8 2.5 3.1 2.6 1.1 5.4
    Property Porosity (%) 5.0 15.0 2.0 20.0 10.0 6.0 25.0 20.0 1.0 0.3 5.0
    Ave. pore size 0.4 1.5 0.1 3.0 0.3 0.5 1.3 5.0 0.1 0.1 0.9
    (μm)
    Evaluation Moldability Δ Δ
    Result Uncomfortable X X Δ
    low frequency
    vibration
    (porosity)
    Comfortable Δ X Δ X Δ
    natural sound
    (specific
    gravity, pore
    size)
    Low pitched Δ Δ Δ X
    tone
    enhancement
    (specific
    gravity, pore
    size)
    Feeling of Δ Δ Δ X Δ
    sound depth
    (specific
    gravity, pore
    size)
    High pitched Δ X
    tone
    enhancement
    (specific
    gravity, pore
    size)
    ave. = average
    temp. = temperature
  • [0058]
    From the results in Table 1, maintaining the porosity and the specific gravity within the predetermined range reduces the unconformable low frequency vibration and provides the functional material for acoustic equipment with preferable sound performance such as comfortable natural sound, low pitched sound enhancement, sound depth feeling, and high pitched sound enhancement. Also, the material is superior in its moldability.
  • INDUSTRIAL APPLICABILITY
  • [0059]
    The functional material for acoustic equipment of this invention made by molding and curing the resin compositions composed of the thermosetting resin and the filler shows superior sound performance to the conventional material and is suitable for an audio board, an insulator (acoustic equipment foot, transformer vibration damping board, and speaker unit vibration damping board) , a tuning panel, an acoustic equipment box, an audio rack, and a speaker box material.

Claims (5)

    What is claimed is:
  1. 1. Functional material for acoustic equipment, which is a molded resin composition consisting of a thermosetting resin and a filler, wherein
    a specific gravity of the molded material is between 1.5 and 5.0,
    a porosity of the molded material is between 2% and 20%, and
    an average pore size of the material is between 0.1 μm and 3.0 μm.
  2. 2. The functional material for acoustic equipment according to claim 1, wherein
    said resin composition has 5-25 weight % of the thermosetting resin relative to the entire amount of the resin composition.
  3. 3. The functional material for acoustic equipment according to claim 1, wherein
    said filler of the resin composition partially includes 10-35 weight % of a porous filler relative to the entire resin composition.
  4. 4. The functional material for acoustic equipment according to claim 3, wherein
    said porous filler has a micro porous structure.
  5. 5. The functional material for acoustic equipment according to claim 4, wherein
    said porous filler with the micro porous structure is one or more selected from a group of zeolite, active carbon, porous silica, and porous alumina.
US14616503 2014-02-12 2015-02-06 Functional Material for Acoustic Equipment Abandoned US20150225944A1 (en)

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Publication number Priority date Publication date Assignee Title
US5400296A (en) * 1994-01-25 1995-03-21 Poiesis Research, Inc. Acoustic attenuation and vibration damping materials
US5665295A (en) * 1994-08-04 1997-09-09 Teijin Limited Process for the production of composite molded article
US7263028B2 (en) * 2003-10-09 2007-08-28 United States Of America As Represented By The Secretary Of The Navy Composite acoustic attenuation materials
US7484589B2 (en) * 2004-03-04 2009-02-03 The Boeing Company Apparatus and method for reducing aircraft noise and acoustic fatigue
US7395898B2 (en) * 2004-03-05 2008-07-08 Rsm Technologies Limited Sound attenuating structures
US8181580B2 (en) * 2004-12-29 2012-05-22 Coda Capital Mangement Group, LLC Composite structural material and method of making the same
US7837008B1 (en) * 2005-09-27 2010-11-23 The United States Of America As Represented By The Secretary Of The Air Force Passive acoustic barrier
US20150122578A1 (en) * 2012-07-10 2015-05-07 Panasonic Intellectual Property Management Co., Ltd. Audio device

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