US3087574A - High acoustic transmission loss panel and the like - Google Patents

High acoustic transmission loss panel and the like Download PDF

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Publication number
US3087574A
US3087574A US851099A US85109959A US3087574A US 3087574 A US3087574 A US 3087574A US 851099 A US851099 A US 851099A US 85109959 A US85109959 A US 85109959A US 3087574 A US3087574 A US 3087574A
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United States
Prior art keywords
panel
acoustic
layers
core
transmission loss
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Expired - Lifetime
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US851099A
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English (en)
Inventor
Bill G Watters
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RTX BBN Technologies Corp
Original Assignee
Bolt Beranek and Newman Inc
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Filing date
Publication date
Priority to NL255745D priority Critical patent/NL255745A/xx
Application filed by Bolt Beranek and Newman Inc filed Critical Bolt Beranek and Newman Inc
Priority to US851099A priority patent/US3087574A/en
Priority to GB3757563A priority patent/GB954908A/en
Priority to GB1146560A priority patent/GB954907A/en
Priority to DE19601409914 priority patent/DE1409914A1/de
Priority to BE590089A priority patent/BE590089A/fr
Priority to AT918668A priority patent/AT282898B/de
Priority to US22592262 priority patent/US3249178A/en
Application granted granted Critical
Publication of US3087574A publication Critical patent/US3087574A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B32B17/10045—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets with at least one intermediate layer consisting of a glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10366—Reinforcements of the laminated safety glass or glazing against impact or intrusion
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E04B2001/8466—Solid slabs or blocks layered with an intermediate layer formed of lines or dots of elastic material
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling

Definitions

  • the present invention relates to walls, partitions and other surfaces, hereinafter generically referred to as panels and the like, and more particularly, to structures for providing a high acoustic transmission loss over a wide band of acoustic frequencies.
  • the terms acoustic, so-und, and vibrationa as herein employed, are intended to embrace all kinds of vibrations including audible, sub-audible and super-audible frequencies.
  • An object of the present invention is to provide a new and improved panel Vand the like of the character described that is relatively inexpensive to manufacture and of relatively ⁇ simple construction, and yet is designed to take advantage of the high acoustic transmission-loss phenomenon attain-able in accordance with the teachings of the said copending application and the said article.
  • An :additional object is to provide a novel panel and the like of more general utility, also.
  • FIG. l is a fragmentary longitudinal ysection of .a panel and the like constructed in accordance with the present invention
  • FIGS. 2 and 3 are similar views of modified structures
  • FIG. 4 is a view similar to FIG. 3 of still a further modification
  • FIG. 5 is a fragmentary longitudinal section similar to FIG. 4 of a preferred embodiment of the invention.
  • FIGS. 6 and 7 are similar views of still additional modified structures
  • FIG. 8 is a graph presenting experimentally obtained performance characteristics of la panel constructed in accordance with the embodiments of FIGS. 4 and 5 and FIGS. 9 to l2 are fragmentary views of further mod-i- Iications illustrated in the act of bending.
  • the velocity of the effective shear wave propagating in the interior medium of the panel between the outer surfaces or facing-s must not exceed approximately ⁇ 0.7 of the velocity C0 of sound in the air or other maxim-m surrounding the panel; preferably not greater than two-thirds such velocity.
  • This requires a sumciently low ratio of shear modulus-to-density of the interior medium or core of the panel and the like, where density is defined as the density of the interior medium, as loaded with the panel structure.
  • the effective longitudinal stiffness of the inte-rior medium defined as the longitudinal stiffness of the shearable or eifectiveiy shearable part of the interior medium, must be less than the longitudinal stiffness (Youngs modulus) of the inner and outer facing :surfaces in order to ⁇ set up the shear-wave boundary condition essential to the ⁇ attainment of the above-described phenomenon.
  • the thickness of the panel and the parameters of the interior medium must be such as to provide a transverse mechanical resonant frequency outside the band of acoustic frequencies that are to be prevented from transmission through the panel and the like.
  • a panel or the like that satisfies the above-mentioned criteria is constructed of relatively inexpensive materials and is of simple structural design.
  • the panel and the like has inner and outer surfaces or facings 3 and 3 bounding an interior medium or thickness b. That interior medium is shown comprising inwardly extending transversely rigid supports 5 and 5', integral with the inner surfaces of the inner and outer panel facings 3 .and 3', though, as later explained, an integral construction is not essential, even if, in some cases, it is preferred.
  • the rigid inwardly extending supports 5, 5 are shown longitudinally spaced from one another along the length of the panel and the like, the spaces being illustrated as cavities or openings 2.
  • the .length of the rigid supports is illustrated by the dimension r and the length of the spaces 2 is illustrated by the dimension l1.
  • a relatively thin shearable elastic layer 4 Sandwiched between the rigid supports 5, 5 and in contact therewith is a relatively thin shearable elastic layer 4, as of rubber, synthetic elastomers, appropriately plasticized plastic materials such as polyvinyl chloride and similar soft but incompressible materials.
  • the layer 4 may be adhered to the rigid supports 5, 5 in any conventional manner, as with the aid of a bonding adhesive, not shown.
  • the reason for the requirement of substantial incompressibility resides in the fact that it is desired to maintain a high transverse stiffness in the layer 4, without impairing its ability to shear in response to movement of the surfaces 3, 3', ⁇ thereby to avoid a detrimental doublewall transverse resonance that would otherwise be produced in the useful audible spectrum by panels and the like of convention dimensions.
  • the shearable medium 4 need not be constituted of a single layer but may be constructed of multi layers. Materials appropriately laminated together may be used which will present the effective result of shearing and of providing high transverse stiffness.
  • a pair of layers 24 is shown laminated with a relatively thin stiff layer or membrane 26, as of metal, glass, mica or the like to assist in the provision of high transverse stiffness without impairing the shearing or effective shearing qualities of the composite shearable layer means 24-26.
  • shearable layer 34 is shown adjacent the surface 33, with only the rigid supports 35 extending from the surface 33' and separated vby spacers 32.
  • the invention is not limited to the use of a single elastic layer or of a single composite elastic layer.
  • a pair of shearable layers 44" is employed, one adjacent the inner boundary of each of the inner and outer panel surfaces 43, 43', with the plurality of rigid supports 45 separated by spaces 42 interposed between the inner surfaces of the layers 44.
  • the layers 44 need each be only the thickness substantially 1/2 b2.
  • the supports 45 moreover, could also be divided by one or more intermediately extending sheets similar to the sheet 2d of FIG. 2, preferably disposed substantially parallel to the faces 43, 43'. In effect, this is illustrated in FIG.
  • central solid region 1050 of the spacer means 105 acts as an intermediate stiff dividing member, as of gypsum, metal or the like, reference numbers 102, 103 and 103', and 104 designating the spaces, surfaces, and elastic layers previously described.
  • FIG. 9 Still a different arrangement is shown in FIG. 9, where the shear layers 94 are disposed laterally between the rigid supports 950, the latter being of cross-shape to define the spaces or cavities 920 between thel surfaces 93 and 93.
  • FIG. 8 an experimentally obtained graph is presented showing the relationship between the transverse or bending wave velocity propagated along a panel constructed in accordance with the embodiment of FIG. 4 (plotted along the ordinate in units of feet per second) and the frequency of the acoustic energy (plotted in units of cycles per second along the abscissa).
  • the dimensions of the experimental structure were are follows: inner and outer surfaces 43 and 43' were lS-guage steel plates; the
  • shearable layers 44 were of gum rubber, 35 Durorneter, secured to the surfaces 43, 43 and the supports 45 with an epoxy adhesive and of thickness 1/2 b2 equal to 0.018 inch; rigid supports 45 of aluminum of thickness b1 equal to 1 inch; and support length r equal to 1/2 inc-h and space length h equal to 0.1 inch. It will be observed 'from FIG. S that a substantially constant transverse-wave velocity is achieved, well below the velocity of sound in air, over a broad band of acoustic frequencies, void of double-wall resonance effects. High transmission loss over this band can be obtained, that is comparable to the transmission loss obtainable with the structures described in the said copending application and in the said article.
  • the rigid supports need not assume the particular geometric configuration shown and described, but, as explained in the said copending application, and in the said article, may take any of a variety of forms including, for example, appropriate spaced cell types tof structures.
  • a spaced cell supporting structure 75 is illustrated extending inwardly from the outer surface '73', to sandwich a shearable layer 4 against the inner boundary of the opposite panel surface 3.
  • the supports 75 of FIG. 7 are shown kerfed to provide an even smaller contact area with the shearable layer.
  • the resulting further spaces 72' are illustrated as of length g, and the more limited regions of contact with the shearable layer 74 are illustrated as of length j.
  • the core sections must be of materials relatively stiff in the transverse direction, such as the metal blocks before referred to, or a cellular construction, or materials such as gypsum or the like, to mention Ibut a few materials.
  • the total transverse compliance should be so sufficiently low that the mechanical resonant frequency lies well outside the useful band of acoustic frequencies, as before explained.
  • an appreciable, if not the principal, transverse compliance may reside in the shearable layer.
  • An effective shear-like performance can also be obtained by having cantilever-like resilient spacers 1250" that, like the above-mentioned slack or perforated spaced cell walls, can deform transversely, while the surfaces 123, 123' remain substantially undistorted, as shown in FIG. 12, in response to bending vibrations, thereby producing an eective shear-wave velocity of the required value.
  • a substantially homogeneous shearable medium 64 as of rubber or the like, is shown in FIG. 6 sandwiched between the inner and outer surfaces 63, 63', and containing relatively uniformly distributed rigid spheres or other spaced supporting members 65 therein.
  • FIG. 11 shows block supports 1050 with the longitudinally extending regions A of the elastic material 114 adjacent surfaces 113, 113' in shear, and the regions B between the blocks, bending, as shown, to contribute to the shear stilness.
  • any acoustic energy striking either of the panel surfaces can reflect back into the room or other space whence the acoustic energy originated.
  • one or both of the outer panel surfaces 53, 53' may be perforated as shown in the case of the upper panel 53 of FIG. 5, having the perforations S7 therein.
  • the perforated surface 53 may then be covered with an acoustically resistive layer or layers such as a fibrous iblanket or covering 58 to achieve the abovedescribed result of absorbing incident acoustic energy, in view of the action of the resistive layer or layers in combination with the air-permeable spaces 52 separating supports 55 within the core.
  • Resistive material could also be placed in such permeable spaces 52, access to the spaces being provided through the elastic layer 54 shown paired With another elastic layer 54. If the resistive layer or layers 58 is or are applied to the outside surface of the perforated member 53, rather than on the inside thereof, where it or they would work equally Well for acoustically absorptive purposes, the perforations will be concealed and an attractive wall-paper-like covering (not shown) may be provided. It is to be understood that this modification may also be incorporated into all of the other embodiments of the invention for the purpose described.
  • All of the embodiments of the invention may also be formed into small panels or blocks that, when assembled, provide the required sound-shearing wall of the present invention.
  • the term panel is also intended to embrace thin strips, such as beams and the like.
  • An acoustic panel for providing high acoustic transmission loss for a band of acoustic frequencies comprising stiff, thin steel-like layers spaced apart by a core, said core having between the layers a plurality of spaced rigid metal-like blocks and at least one lamina of elastic rubberlike material, the thickness b2 of said lamina being substantially less than the thickness b of said core, said layers having a longitudinal stiffness greater than the effective longitudinal stiffness of said core, said panel having a mass Iper unit area m and said core having a shear modulus n related to the velocity C of acoustic waves in the medium surrounding said panel substantially by the eX- pression ubzAs 'm $0.7 C'o where As is the eective cross-sectional area substantially parallel to said layers of the blocks cumulatively, and AT is the surface area of a side of one of said layers.
  • the panel of claim 1 having at least two of said laminae with one lamina arranged adjacent each of said layers, respectively, and with said blocks between said laminae.
  • said resistive means comprises -a resistive sheet adjacent said at least one layer.
  • An acoustic panel for providing high acoustic transmis-sion loss for a band of acoustic frequencies comprising stiff, thin steel-like layers spaced apart by a core, said core having between the layers a plurality of spaced rigid metal-like blocks, said layers having a longitudinal stiffness greater than the eiective longitudinal stiffness of said core, at least one of said layers having perforations therethrough in communication with the spaces between said blocks to permit the entry of acoustic energy into said spaces, and acoustically resistive means adjacent said perforations to absorb said acoustic energy, the ratio of the shear modulus to the density of the core providing an acoustic shear wave velocity 4for the propagation of said band of acoustic frequencies along said panel which is less than substantially seven-tenths the velocity of acoustic energy in the medium surrounding said panel.
  • said resistive means comprises sound absorbing material on the side of the perforated layer opposite said core.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
US851099A 1959-11-05 1959-11-05 High acoustic transmission loss panel and the like Expired - Lifetime US3087574A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL255745D NL255745A (de) 1959-11-05
US851099A US3087574A (en) 1959-11-05 1959-11-05 High acoustic transmission loss panel and the like
GB1146560A GB954907A (en) 1959-11-05 1960-03-31 Panel structure providing a high acoustic transmission loss
GB3757563A GB954908A (en) 1959-11-05 1960-03-31 Panel structure with high acoustic transmission loss
DE19601409914 DE1409914A1 (de) 1959-11-05 1960-04-06 Platte u.dgl. mit hoher Schalldaemmung
BE590089A BE590089A (fr) 1959-11-05 1960-04-25 Panneau et dispositif analogue à affaiblissement élevé de transmission acoustique.
AT918668A AT282898B (de) 1959-11-05 1960-08-03 Platte zum Aufbau von Außen- oder Innenwandkonstruktionen, mit hohen akustischen Übertragungsverlusten in einem vorgegebenen Frequenzbereich
US22592262 US3249178A (en) 1959-11-05 1962-09-24 High acoustic transmission loss panel

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US851099A US3087574A (en) 1959-11-05 1959-11-05 High acoustic transmission loss panel and the like

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US3087574A true US3087574A (en) 1963-04-30

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US (1) US3087574A (de)
AT (1) AT282898B (de)
BE (1) BE590089A (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115948A (en) * 1960-12-14 1963-12-31 Koppers Co Inc Panel for the reduction of sound transmission
US3176789A (en) * 1962-01-26 1965-04-06 Lighter Stephen Acoustic panels
US3211253A (en) * 1964-01-15 1965-10-12 Douglas Aircraft Co Inc Acoustical panel comprising a cellular core having a face thereof coated with fibers bridging the cells
US3229785A (en) * 1964-01-23 1966-01-18 Ruben R Pottash Acoustic tile with sound-reflective polymeric layer bonded to fibrous layer
US3276537A (en) * 1962-08-10 1966-10-04 Oddvar S Halbostad Sound-absorbing ceiling with interchangeable panels for absorbing different frequencies
US3386527A (en) * 1965-08-05 1968-06-04 Daubert Chemical Co Adhesive sound damping tape for application to vibrating panels
DE1905895B1 (de) * 1969-02-03 1970-07-30 Mannesmann Ag Splitterschutzblock,vornehmlich zum Schutz militaerischer Einrichtungen
US3693750A (en) * 1970-09-21 1972-09-26 Minnesota Mining & Mfg Composite metal structure useful in sound absorption
US3828504A (en) * 1971-05-25 1974-08-13 K Spang Concrete structural member with high internal damping
US3983955A (en) * 1973-03-22 1976-10-05 Costa Silard Vasiljevic Arrangement for damping sound with resonators
US4083159A (en) * 1973-10-29 1978-04-11 Hitco Structural sound absorbing panel for underwater use and methods of making same
US4390976A (en) * 1981-01-27 1983-06-28 The United States Of America As Represented By The Secretary Of The Navy Acoustic signal conditioning device
US4399526A (en) * 1981-01-27 1983-08-16 The United States Of America As Represented By The Secretary Of The Navy Acoustic baffle for high-pressure service, modular design
US4416349A (en) * 1981-09-30 1983-11-22 The Boeing Company Viscoelastically damped reinforced skin structures
US4425980A (en) 1981-12-14 1984-01-17 The Boeing Company Beam dampers for damping the vibrations of the skin of reinforced structures
US4566231A (en) * 1983-09-27 1986-01-28 The Boeing Company Vibration damping stiffener
US4828202A (en) * 1979-09-27 1989-05-09 The Boeing Company Method and apparatus for wideband vibration damping of reinforced skin structures
US5347906A (en) * 1993-11-12 1994-09-20 Geiger John F Adjustable stringed instrument mute
US20120064285A1 (en) * 2010-09-15 2012-03-15 Mathur Gopal P Multifunctional nano-skin articles and methods
US11254087B2 (en) * 2017-04-26 2022-02-22 Corning Incorporated Micro-perforated glass laminates and methods of making the same
US20220130363A1 (en) * 2019-02-13 2022-04-28 Nissan Motor Co., Ltd. Soundproofing structure
US20220189445A1 (en) * 2019-02-13 2022-06-16 Nissan Motor Co., Ltd. Soundproofing structure
US11557937B2 (en) 2018-11-15 2023-01-17 Cummins Power Generation Ip, Inc. Genset enclosures with low acoustic noise

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184482A (en) * 1936-05-15 1939-12-26 Crown Cork & Seal Co Vibration absorbing composition and structure embodying the same
US2579324A (en) * 1947-05-16 1951-12-18 Bell Telephone Labor Inc Metallic structure for delaying propagated waves
US2744042A (en) * 1951-06-21 1956-05-01 Goodyear Tire & Rubber Laminated panels
GB754299A (en) * 1954-05-10 1956-08-08 United States Steel Corp Structural panel and method of manufacture
US2806509A (en) * 1956-06-11 1957-09-17 Goodyear Aircraft Corp Sandwich structures
US2838806A (en) * 1957-06-18 1958-06-17 Celotex Corp Fireproof acoustical correction panels
GB810505A (en) * 1955-06-21 1959-03-18 Walter Wiederhold Process for the production of a sound-absorbing layer on immersed walls at the boundary surfaces of liquids

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184482A (en) * 1936-05-15 1939-12-26 Crown Cork & Seal Co Vibration absorbing composition and structure embodying the same
US2579324A (en) * 1947-05-16 1951-12-18 Bell Telephone Labor Inc Metallic structure for delaying propagated waves
US2744042A (en) * 1951-06-21 1956-05-01 Goodyear Tire & Rubber Laminated panels
GB754299A (en) * 1954-05-10 1956-08-08 United States Steel Corp Structural panel and method of manufacture
GB810505A (en) * 1955-06-21 1959-03-18 Walter Wiederhold Process for the production of a sound-absorbing layer on immersed walls at the boundary surfaces of liquids
US2806509A (en) * 1956-06-11 1957-09-17 Goodyear Aircraft Corp Sandwich structures
US2838806A (en) * 1957-06-18 1958-06-17 Celotex Corp Fireproof acoustical correction panels

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115948A (en) * 1960-12-14 1963-12-31 Koppers Co Inc Panel for the reduction of sound transmission
US3176789A (en) * 1962-01-26 1965-04-06 Lighter Stephen Acoustic panels
US3276537A (en) * 1962-08-10 1966-10-04 Oddvar S Halbostad Sound-absorbing ceiling with interchangeable panels for absorbing different frequencies
US3211253A (en) * 1964-01-15 1965-10-12 Douglas Aircraft Co Inc Acoustical panel comprising a cellular core having a face thereof coated with fibers bridging the cells
US3229785A (en) * 1964-01-23 1966-01-18 Ruben R Pottash Acoustic tile with sound-reflective polymeric layer bonded to fibrous layer
US3386527A (en) * 1965-08-05 1968-06-04 Daubert Chemical Co Adhesive sound damping tape for application to vibrating panels
DE1905895B1 (de) * 1969-02-03 1970-07-30 Mannesmann Ag Splitterschutzblock,vornehmlich zum Schutz militaerischer Einrichtungen
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AT282898B (de) 1970-07-10
BE590089A (fr) 1960-08-16

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