Abstract: A structural panel includes a first skin, a second skin and a core. The core is connected to the first skin and the second skin. The core includes a corrugated sheet of wire mesh that includes a plurality of corrugations. Each of the corrugations extends vertically between and engages the first skin and the second skin.

Abstract: The present disclosure relates to a lightweight noise absorbing material and a substrate having the same attached thereto, and more particularly, to a lightweight noise absorbing material providing lightweight and excellent noise absorption performance compared to existing noise absorbing materials by including a triple thin fiber layer in which upper and lower fine fiber layers are stacked respectively on upper and lower surfaces of a fibrous non-woven fabric, and a substrate having the lightweight noise absorbing material attached thereto.

Abstract: A flexible, wrappable multilayered heat shield is provided. The heat shield includes a reflective metal outermost layer, an innermost layer of high temperature yarn capable of withstanding temperatures up to about 650 degrees ° C. continuously, and about 750° C. intermittently, and an intermediate layer of nonwoven material capable of withstanding temperatures up to about 550° C. continuously sandwiched between the outermost and innermost layers.

Abstract: An acoustic insert comprises a sleeve having a first end and a second end. The sleeve comprises segments between the first end and the second end. A first acoustic septum is placed within the sleeve at a first depth. A second acoustic septum placed within the sleeve at a second depth.

Abstract: An evaporator is provided with a refrigerant pipe, a cold storage case which has inner fins mounted therein, and air-side fins. The evaporator is characterized in that the cold storage case is provided with: a filling opening for filling the cold storage case with a cold storage material; a first flow passage connecting to the filling opening and extending in the same direction as the direction of inflow of the cold storage material; and a second flow passage connecting to the first flow passage and extending in the direction intersecting the first flow passage.

Abstract: Insulating molded part having an upper part and a bottom part. The upper part and bottom part are formed as an integral injection molded or die-cast part. Further, cavities, between the upper part and the bottom part, are arranged as chambers separated from one another in an air-tight manner and the upper part and the bottom part are formed in respective cuboid manners, and the upper part is offset in a diagonal direction in relation to the bottom part.

Abstract: A wall support for a ceiling support grid with grid members is disclosed. Each grid member can have a top with a bulb, a web extending downward from the bulb, and a bottom with a flange extending from the web opposite the bulb. Examples of the wall support may include a bracket having a C-shaped channel with a back, a lower flange at a lower end of the back, and an upper flange at an upper end of the back. In addition, the bracket may include only one tab in the lower flange for each grid member. The only one tab may be configured to engage and retain the flange of a respective grid member. The grid member may rest on the lower flange. The lower flange may have no other features for positive engagement with and retention of the flange of the respective grid member.

Abstract: A sound-attenuating composite structure may comprise a honeycomb core assembly having a plurality of honeycomb cells defined by sidewalls, wherein the honeycomb core assembly is sandwiched between an inner impervious skin and a perforated outer skin. The sound-attenuating composite structure may further comprise a ceramic foam insert received in each of the honeycomb cells at a predetermined insertion depth to form an obstruction therein. Each of the ceramic foam inserts may have a predetermined thickness defined between substantially flat top and bottom surfaces. The sound-attenuating composite structure may have predetermined acoustic performance characteristic that are controlled, at least in part, by the predetermined thickness and the predetermined insertion depth.

Abstract: A sound attenuating material having a homogenous mixture of an organic man-made fiber, an inorganic man-made fiber, a binder, and a cellulose material wherein the organic man-made fiber is polyester, the inorganic man-made fiber is fiberglass, and the binder is a thermosetting resin. A sound attenuating composite is defined by the sound attenuating material and a ground EVA or a mixture of EVA and one or more recycled materials to define a gradient density sound attenuating composite material. Further, the gradient density composite may optionally include a polyfilm upon which the ground EVA or recycled materials may be disposed or two layers of polyfilm to surround the EVA or EVA mixture. The EVA may be pure EVA or may include a mineral fill.

Abstract: A composite component assembly may include a composite core including a plurality of core cells between first and second ends. A connection joint is formed between the first and second ends. An adhesive layer is disposed within the connection joint between the first and second ends. The adhesive layer is configured to bond the first and second ends through a curing process. A peg splice securing joint securely connects the first and second ends together before and during the curing process.

Abstract: A vehicular mat to be placed on a vehicular floor panel includes a floor portion, a tunnel portion, a rear edge portion, at least two score lines extending in a vehicular width direction, and a tunnel cutoff portion. The floor portion commonly covers at least two types of vehicular floor panels having different lengths. The rear edge portion is continuous from a vehicular rear edge of the floor portion and has a through hole to be fitted to the opening of the tunnel portion. The vehicular mat is folded along one of the at least two score lines so that the rear edge portion is angled and lifted upward with respect to the floor portion. The tunnel cutoff portion included in the tunnel portion is to be cut off from the vehicular mat to be placed on the second vehicular floor panel.

Abstract: A honeycomb structure dial includes cells in which septums are located to provide acoustic dampening. The cells are formed by at least our walls wherein at least two of the walls are substantially parallel to each other. The septums include warp fibers and weft fibers that are substantially perpendicular to each other. The septums are oriented in the honeycomb cells such that the weft fibers and/or warp fibers are substantially perpendicular to the parallel walls.

Abstract: A nacelle may comprise a noise suppressing structure. The noise suppressing structure may comprise a plurality of noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The plurality of noise suppressing cells may contact the perforated layer of material and the non-perforated layer of material at an acute angle (e.g., between twenty and seventy-five degrees) such that the plurality of noise suppressing cells are non-orthogonal to the perforated layer of material and the non-perforated layer of material. Further, each of the plurality of noise suppressing cells may comprise a hexagonal cross-sectional profile. Further still, the noise suppressing structure may comprise a support structure comprising a plurality of support members, wherein the plurality of noise suppressing cells are situated within the support structure.

Abstract: A method for repairing a sound attenuation panel is disclosed. The panel includes a structuring skin in metal material, a resistive layer in metal material and a honeycomb structure as acoustic absorption material directly added onto the structuring skin and resistive layer. The method includes a step in which one reinforcing pin is inserted into the thickness of the attenuation panel and a step in which the reinforcing pin is secured by welding in a controlled atmosphere to the structuring skin and resistive layer respectively.

Abstract: An acoustic panel includes a first cellular layer with cells having a first axis, a second cellular layer with cells having a second axis, and a perforated septum layer separating the first layer and the second layer. The cells of both layers have an end distal to the septum layer and an end which meets the septum layer, and the maximum diameter of the cells of the first layer is less than the maximum diameter of the cells of the second layer.

Abstract: A cellular acoustic structure for a turbojet engine includes a closed wall. The closed wall includes at least two faces having acoustically transparent areas and acoustic reflective areas. The closed wall is filled with a plurality of cells, and the acoustic reflective areas are disposed within the closed wall so that an acoustic path of aerial sound vibrations travels through the acoustically transparent areas, penetrates inside the cells and reflects on the acoustic reflective areas. In particular, the acoustic path in some of the cells has a depth greater than a half of the thickness of the cellular acoustic structure.

Abstract: An acoustic barrier structure can include a support structure that defines a plurality of cells, a weight attached to the support structure, and at least one resonant membrane covering one of the plurality of cells. The at least one resonant membrane can comprise at least one weight. The at least one resonant membrane can have an anti-resonant frequency and the support structure with the weight can provide wide frequency band gaps between odd resonance modes while suppressing structure-membrane coupled modes to enable the anti-resonance of the at least one resonant membrane.

Abstract: A method and apparatus comprising a composite panel and a number of structures to reduce noise radiation from the composite panel. The composite panel has a first face sheet, a second face sheet, and a core located between the first face sheet and the second face sheet. The number of structures is associated with the first face sheet. The number of structures has a mass with a configuration to reduce a speed of waves propagating in the composite panel such that noise radiating from the composite panel is reduced.

Abstract: A multilayered acoustic panel (1) including: a substantially air impermeable outer membrane layer (3); an underlying second portion bonded to the membrane layer (3), the second portion including an intermediate layer (5); and an inner layer (7) underlying the second portion, the inner layer (7) having a plurality of apertures (6) therein, said apertures (6) being covered by the intermediate layer (5) of the second portion, wherein the membrane layer (3) and second portion are not bonded together where the membrane layer (3) overlies the apertures (6) such that those portions of the membrane layer (3) which overlie the apertures (6) are free to vibrate independently of the second portion in response to sound waves incident on the membrane layer (3).

Abstract: A drainage mat for use in building structures, particularly in exterior walls and roofing, to improve drainage and ventilation within such structures. The drainage mat includes a web of extruded polymer monofilaments that are heat welded at junctions to form a matrix of tangled monofilaments. The web includes on its front face an alternating array of ridges and planar regions, each ridge having a substantially trapezoidal shape with a top surface and a base, the width of the top surface being less than the width of the base.

Abstract: The present disclosure relates to a method for repairing a portion of an acoustic panel for a nacelle of an aircraft turbojet engine. The panel includes an acoustic skin in which a plurality of acoustic holes are drilled, a solid skin, and a cellular acoustic structure. The cellular acoustic structure, being arranged between the acoustic skin and the solid skin, has a plurality of cells, each of which has one or more drainage openings arranged in one or more of the walls forming each cell. The method includes a step of: defining a part of the acoustic panel to be cut; forming a cutting area closed by the acoustic skin; injecting a resin through the acoustic holes; positioning a replacement cellular acoustic structure in the cutting area and on the acoustic skin; forming a solid replacement skin on the replacement cellular acoustic structure.

Abstract: An acoustically absorptive panel comprises a porous acoustical absorber having a planar configuration mounted on a support frame, an acoustically transparent front fabric stretch-mounted on the support frame and spaced from and in parallel alignment with the front face of the porous acoustical absorber and forming an airspace, the porous absorber, front fabric and forward air space acting as acoustical absorbing chamber capable of absorbing a greater range of sound frequencies than the porous acoustical absorber alone, the range of frequencies absorbed depending on the depth of the air space.

Abstract: A honeycomb structure that includes cells in which septums are located to provide acoustic dampening. The cells are formed by at least four walls wherein at least two of the walls are substantially parallel to each other. The septums include warp fibers and weft fibers that are substantially perpendicular to each other. The septums are oriented in the honeycomb cells such that the weft fibers and/or warp fibers are substantially perpendicular to the parallel walls.

Abstract: The invention provides a device for acoustical treatment of the noise emitted by a bypass turbojet comprising a primary cowl having in an outer surface an inner annular acoustic treatment panel and a secondary cowl including in an inner surface an outer annular acoustic treatment panel arranged facing the inner panel. The inner and outer panels include respective central panel portions facing each other and extending axially over a common predetermined length, the length of the central panel portions lying in the range one-fifth to four-fifths of the total length of the panels, and the ratio between the acoustic resistances of the central panel portions being not less than 2.

Abstract: An acoustic panel is provided that includes at least one cellular core arranged between at least an internal skin and an external skin, wherein the external skin incorporates at least one fastener able to collaborate in a disconnectable fashion with a complementary fastener associated with a structure to which it is to be attached.

Abstract: A partition panel improves sound insulation performance and optimizes a reverberation time. The partition panel has sound absorption and insulation functions, and has a front plate having a perforated section with a plurality of through-holes and an entirely-continuous peripheral edge portion located outside the perforated section. An entirely-continuous back plate is disposed on a side opposite to a sound source across the front plate. An inner perforated plate is disposed between the perforated section of the front plate and the back plate. A front-side honeycomb core is interposed between the perforated section and the inner perforated plate, a back-side honeycomb core is interposed between the back plate and the inner perforated plate and a peripheral honeycomb core is interposed between the peripheral edge portion of the front plate and a region of the back plate opposed to the peripheral edge portion.

Abstract: Honeycomb sections are bonded together with seams made up of an adhesive that is carried by a honeycomb seam support or a linked-segment seam support. The seams are particularly useful for splicing together curved honeycomb sections that contain acoustic septum. The curved acoustic honeycomb sections are spliced or seamed together to form engine nacelles and other acoustic dampening structures.

Abstract: The present invention relates to an acoustic energy reflector comprising a microcellular rubber as inner liner and a fiber reinforced composite as outer casing, in a core-shell assembly, wherein the said microcellular rubber is selected from the group of natural and synthetic rubbers having glass transition temperature below 0° C. and the resin for the fiber reinforced composite is selected from a group having a glass transition temperature at least 50° C.

Abstract: PROBLEMS The present invention provides a sound absorbing structure that enables a sound absorbing rate thereof to be raised in a low-frequency region or medium-high frequency from around 500 Hz to 10 KHz, and a thickness thereof to be reduced. SOLUTIONS The sound absorbing structure has: a non-air permeable sheet molding object having, on one surface side thereof, a plurality of cavities including recesses formed by bending; and a non-air permeable surface sheet which is layered on the sheet molding object, on a cavity open-top side surface thereof, so as to cover open-top of the plurality of cavities, wherein the surface sheet is fixed at outer peripheral sections of the sheet molding object 11 and is not fixed to the sheet molding object at portions between adjacent cavities.

Abstract: An acoustic panel is provided that includes at least one cellular core arranged between at least an internal skin and an external skin, wherein the external skin incorporates at least one fastener able to collaborate in a disconnectable fashion with a complementary fastener associated with a structure to which it is to be attached.

Abstract: An acoustic suppression system for absorbing and/or scattering acoustic energy comprising a plurality of acoustic targets in a containment is described, the acoustic targets configured to have resonance frequencies allowing the targets to be excited by incoming acoustic waves, the resonance frequencies being adjustable to suppress acoustic energy in a set frequency range. Methods for fabricating and implementing the acoustic suppression system are also provided.

Abstract: The present invention relates to providing an acoustic diffuser. In particular, the present invention relates to systems and methods for providing an asymmetric cellular acoustic diffuser adapted to diffuse sound waves that encounter a surface. Further, the present invention relates to providing a system of asymmetric cellular acoustic diffusers adapted to diffuse sound waves that encounter one or more surfaces in an acoustic environment. In some embodiments, an acoustic diffusion device as contemplated herein includes a planer panel having a first portion and a second portion, the first portion and the second portion each having a plurality of cells formed asymmetrically thereon. In such embodiments, the plurality of cells of the first portion is symmetrically oriented in relation to the plurality of cells of the second portion.

Abstract: An aircraft cabin panel for acoustic absorption in an interior space includes a core layer, a first cover layer and a second cover layer. The first cover layer includes a space-enclosing first surface, and the second cover layer is arranged opposite the first cover layer. The first cover layer is acoustically transparent, and the core layer includes a honeycomb core with a plurality of tubular or honeycomb-like cells that are open throughout the thickness of the honeycomb core. The honeycomb core on the face pointing towards the first cover layer extends parallel to the first cover layer so as to be continuously throughout, and on the face pointing towards the second cover layer comprises recesses which extend over several cells. Absorbers are accommodated in the recesses.

Abstract: A linear acoustic liner for an aircraft includes a cellular core having a first surface and an opposed second surface. A substantially imperforate back skin covers the first surface, and a perforate face skin covers the second surface of the core. The perforate face skin includes an outer face skin layer having a first plurality of spaced openings, an inner face skin layer having a second plurality of spaced openings, and a porous layer disposed between the outer face skin layer and the inner face skin layer. Each of the first plurality of spaced openings are substantially aligned with one of the second plurality of spaced openings.

Abstract: The present invention relates to an acoustic energy reflector comprising a microcellular rubber as inner liner and a fiber reinforced composite as outer casing, in a core-shell assembly, wherein the said microcellular rubber is selected from the group of natural and synthetic rubbers having glass transition temperature below 0° C. and the resin for the fiber reinforced composite is selected from a group having a glass transition temperature at least 50° C.

Abstract: A polyurethane foam for vehicles is obtained by reaction, foaming, and curing of a polyurethane-foam raw material comprising polyol, polyisocyanate, a blowing agent, and a catalyst, and is used for vehicle parts. The foam raw material comprises expanded graphite and an inorganic compound hydrate. The polyol preferably comprises polymeric polyol in which a polyether polyol is graft-polymerized with a vinyl monomer, polyether polyol having a mass average molecular weight of from 400 to 1,000, in which a polyhydric alcohol is addition-polymerized with an alkylene oxide, and polyether polyol having a mass average molecular weight of from 2,000 to 4,000 in which a polyhydric alcohol is addition-polymerized with an alkylene oxide.

Abstract: A method of making a composite panel having subsonic transverse wave speed characteristics which has first and second sheets sandwiching a core with at least one of the sheets being attached to the core at first regions thereof and unattached to the core at second regions thereof.

Abstract: A multilayer board for reducing solid-borne sound radiation with improved mechanical stability when subjected to a load, comprising a first cover layer, a second cover layer, and at least one core layer, wherein the at least one core layer is arranged between the first and the second cover layer, and wherein the at least one core layer comprises at least one first sloped slot.

Abstract: The present invention relates to providing an acoustic diffuser. In particular, the present invention relates to systems and methods for providing an asymmetric cellular acoustic diffuser adapted to diffuse sound waves that encounter a surface. Further, the present invention relates to providing a system of asymmetric cellular acoustic diffusers adapted to diffuse sound waves that encounter one or more surfaces in an acoustic environment. In some embodiments, an acoustic diffusion device as contemplated herein includes a planer panel having a first portion and a second portion, the first portion and the second portion each having a plurality of cells formed asymmetrically thereon. In such embodiments, the plurality of cells of the first portion is symmetrically oriented in relation to the plurality of cells of the second portion.

Abstract: A linear acoustic liner for an aircraft includes a cellular core having a first surface and an opposed second surface. A substantially imperforate back skin covers the first surface, and a perforate face skin covers the second surface of the core. The perforate face skin includes an outer face skin layer having a first plurality of spaced openings, an inner face skin layer having a second plurality of spaced openings, and a porous layer disposed between the outer face skin layer and the inner face skin layer. Each of the first plurality of spaced openings are substantially aligned with one of the second plurality of spaced openings.

Abstract: An acoustic composite comprises a flow resistive substrate having a solid acoustic barrier material bonded to at least a portion of a major surface of the flow resistive substrate; wherein the acoustic barrier material has a density greater than about 1 g/cm3 and the acoustic composite has a porosity between about 0.002% and about 50%.

Abstract: An acoustic structure that includes a honeycomb having cells in which septum caps are located. The septum caps are formed from sheets of acoustic material and include a resonator portion and a flange portion. The flange portion has an anchoring surface that provides frictional engagement of the septum caps to the honeycomb cells when the caps are inserted into the honeycomb during fabrication of the acoustic structure. An adhesive is applied to the anchoring surface of the septum caps after the caps have been inserted into the honeycomb cells to provide a permanent bond.

Abstract: The object of the present invention is to provide a shock and sound absorbing member having excellent shock and sound absorbing properties for use of a car etc. The shock and sound absorbing member comprises a core panel 2 onto which a plural number of tubular cells 22 are formed lengthwise and widthwise, a base panel 3 being attached to one side of the core panel 2, and a porous sheet 4 covering the other side of the core panel 2, the invading sound waves being damped in the tubular cells 22 of the core panel 2, and then absorbed by the porous sheet 4, the ventilation resistance of the porous sheet 4 being set to be in the range of between 0.5 and 5.0 kPa·s/m.

Abstract: A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

Abstract: A plurality of pellets include at least one of a snythetic, biomass, mineral, or polymer based material. The pellets can have a specific gravity of about 0.01 to about 0.3 g/cm3 and are dimensionally stable, substantially dust-free, substantially non-hygroscopic, and resistant to settling and compression.

Abstract: It is an object of the present invention to provide a floor silencer that has good transport efficiency due to an ability to be transported in a flat state, and can be assembled to a floor panel of a vehicle by folding along a band-like concave portion. The floor silencer is used with a first surface side in contact with a floor carpet, and a second surface side in contact with the floor panel of the vehicle. The floor silencer also has the band-like concave portion and can be folded along the band-like concave portion. The floor silencer is transported in a flat state and not folded during transport, and is used folded along the band-like concave portion during assembly.

Abstract: A description is given of a sandwich structure which comprises a core and outer layers arranged on both sides of the core, in which the core has core clearances which are dimensioned such that the acoustic behavior of the sandwich structure in the region of the core clearances corresponds to the acoustic behavior of a double wall, and at the same time the global acoustic behavior of the sandwich structure is retained.

Abstract: An acoustic structure that includes a honeycomb having cells in which septum caps are located. The septum caps are formed from sheets of acoustic material and include a resonator portion and a flange portion. The flange portion has an anchoring surface that provides frictional engagement of the septum caps to the honeycomb cells when the caps are inserted into the honeycomb during fabrication of the acoustic structure. An adhesive is applied to the anchoring surface of the septum caps after the caps have been inserted into the honeycomb cells to provide a permanent bond.

Abstract: An energy-attenuation structure comprising a core layer of cellular material. Substantially most of the cells of the cellular material are open cells, with those cells disposed in the central portion of the core layer being more open than are those cells disposed in outer portions of the core layer. The openness of the cells generally decreases from the interior of the core layer in a direction toward the outer portions. At least some of the cells of the core layer are filled with a liquid.

Abstract: A liner assembly includes a plurality of aligned passages providing a large open area combined with openings much smaller than a length of the passages. The plurality of passages are disposed parallel with each other and include an opening transverse to incident sound waves. The passages are separated by walls and are blocked at an end distal from the openings. Sound waves incident on a face of the liner enter the passages and are dissipated by viscous losses. Sound energy is further dissipated as thermal energy to the walls of the passages. The long narrow passages provide the desired visco-thermal losses for sound energy in a broad frequency range.