Abstract: Sound absorbing material for use in rooms inside buildings. The material comprises a continuous polymeric film (11) having smooth surfaces, said film having a thickness (t) of about 0.1 to 0.3 mm. The film is provided with numerous substantially parallel discontinuous microslits (12) with a degree of perforation of from 0.3-3%. The microslits are cut with laser devices to produce a highly smooth and level surface. The film is tensioned in a frame (16) with a level film surface or curved film surface.

Abstract: A process and system for making a laminated surface covering and the surface covering itself are described. The covering includes several layers bonded to each other. The system performs the process. One example of the process includes passing a first material across a first conveyor, passing a second material across a second conveyor, passing a bonding material across a third conveyor, contacting the first material and the second material to the bonding material, and heating at least one of the first material and the second material. The process also includes introducing the first material, the second material, and the bonding material into a pressure zone such that the bonding material is introduced between a bottom surface of the first material and a top surface of the second material. The process applies pressure to bond the first material and second material together via the bonding material to produce a laminated material.

Abstract: Systems and methods are provided for enhanced water capture systems for aircraft interiors. One embodiment is a strip that is formed from a water-absorbent material for retaining moisture. The strip is adhered to an interior surface of an aircraft at a location proximate to an entry point for water into a cabin of the aircraft, and the strip comprises holes within the water-absorbent material that are staggered with respect to each other.

Abstract: An apparatus or system includes a component that generates or transfers noise having a frequency within a noise frequency range. The component may include a boundary. The apparatus or system may be an engine in some examples. The engine may additionally include a micro-perforated sheet positioned a distance from the boundary. The micro-perforated sheet may include a plurality of micro-perforated holes, and may be configured to absorb sound within an absorption frequency range based on parameters of the micro-perforated sheet. The parameters may include the distance from the boundary and dimensions of the micro-perforated holes, and may be set such that the absorption frequency range overlaps the noise frequency range.

Abstract: There is provided a laminated glass that has both of a rigidity and a sound insulating property while attaining the weight reduction. The laminated glass comprises a pair of glass plates each having a plate thickness of 0.3 mm to 1.8 mm; and an interlayer film provided between the glass plates and having a storage elastic modulus G? equal to or greater than 2.0×106 Pa at a frequency of 1 Hz and temperature of 20° C., wherein the laminated glass has a loss factor equal to or greater than 0.2 at one or more resonance points at the frequency of 3 to 6 KHz and the temperature of 20° C.

Abstract: An acoustic panel is provided that includes a first layer, a perforated second layer, a core and a noise attenuating feature. The core forms a chamber between the first and the second layers. The noise attenuating feature projects partially into the chamber. The noise attenuating feature is formed integral with the first layer, the second layer and/or the core.

Abstract: An acoustic mullion plug having a composite core construction that includes a mineral plug core enclosed on at least one side by a sound transmission barrier, and includes a fabric covering, is installed via applying a sealant to the wall partition and to the glazing adjacent each end of a mullion and to the mullion itself, so that the acoustic mullion plug is then pressed into the opening and secured into position via either adhesive or via hook-and-loop fastener.

Abstract: A drilling system may include a plurality of robotic drilling units. Each one of the robotic drilling units may include a drill end effector positioned inside a barrel section. The barrel section may be configured as a composite sandwich structure having an inner face sheet. The robotic drilling units maybe operable in synchronized movement with one another to drill a plurality of perforations into the inner face sheet using the drill end effectors in a manner providing a predetermined percent-open-area of the inner face sheet.

Abstract: The invention relates to a casing, particularly of an axial turbomachine compressor. This casing comprises a support of cylindrical overall shape made of composite material, a metal ring fitted by bonding to the internal surface of the support, and a layer of abradable material fitted by plasma spray onto the internal surface of the metal ring. The metal ring is preferably made of stainless steel and is preferably perforated. The perforation allows better keying of the adhesive and allows the degassing thereof. The external surface of the metal ring is preferably sandblasted prior to bonding. Its internal surface is also preferably sandblasted prior to the plasma spraying of the abradable material.

Abstract: An acoustic chamber with low frequency outer wall transmissivity is provided. According to one aspect, an acoustic chamber has an inner wall encompassing an interior of the acoustic chamber and configured to allow acoustic energy to penetrate the inner wall. The acoustic chamber also has an outer wall configured to allow low frequency acoustic energy that penetrates the inner wall to penetrate the outer wall and leave the acoustic chamber.

Abstract: A panel is provided for attenuating noise. This panel includes a first skin, a second skin and a core, which forms a plurality of cavities vertically between the first skin and the second skin. The core includes a first wall, a second wall, a first baffle, a second baffle and a first septum. The cavities include a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle. The first septum is longitudinally between the first baffle and the second baffle and divides the first cavity into fluidly coupled sub-cavities. The first septum is angularly offset from the first wall by an acute angle. One or more perforations in the first skin are fluidly coupled with the first cavity.

Abstract: The disclosed acoustic insulator mat includes a first absorber layer made of a non-woven fibrous material. The non-woven fibrous material comprises a mesh of intertwined fibers that defines a plurality of cavities. The first absorber layer has a first side and a second side. Peripheral cavities are arranged along the second side of the first absorber layer between peripheral fibers. A coating is disposed on the second side of the first absorber layer. The coating is adhered to the peripheral fibers and thus includes a plurality of discontinuities at the peripheral cavities such that the coating provides a partial barrier to noise at the second side of the first absorber layer. The acoustic insulator mat may optionally include a second absorber layer that is retained on the first absorber layer by the coating. A method of manufacturing the acoustic insulator mat is also disclosed.

Abstract: The invention concerns a multilayered perforated sound absorber (1) with a microperforated plastics film (4) and a thermally deformable absorber (3) which is a foam layer, a fabric or a fibrous non-woven layer. The invention further concerns a method for producing a corresponding sound absorber.

Abstract: The soundproof room (41a) has an interior space (43a) defined by soundproof walls (44a, 45a, 46a, 47a). The soundproof room (41a) includes a sound absorber (11a) whose sound absorbing face absorbs sound in the room and is exposed in the room. The sound absorber (11a) has a varying depth dimension from a front face (19a), serving as the sound absorbing face, toward the depth direction. The sound absorber (11a) is formed by stacking a plurality of layer members from the front face (19a), serving as the sound absorbing face, in the depth direction.

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: A nacelle may include a noise suppressing structure. The noise suppressing structure may utilize a noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The noise suppressing cells may have a first portion and a second portion separated by a septum. The first portion may contact the septum at an obtuse angle and the second portion may contact the septum at a reflex angle.

Abstract: An acoustic liner having a honeycomb core is fabricated by forming septa in a sheet of material, and assembling the sheet of material and the core. During the assembly process, the septa are respectively inserted as a group into cells of the core.

Abstract: A soundproof panel has a sandwich structure, which includes two outer walls, a core, and modifying elements that are maintained in a fractal distribution by the core. The panel has an improved trade-off between sound attenuation efficiency and the weight of the panel.

Abstract: Acoustic liners for aircraft noise reduction include one or more chambers that are configured to provide a pressure-release surface such that the engine noise generation process is inhibited and/or absorb sound by converting the sound into heat energy. The size and shape of the chambers can be selected to inhibit the noise generation process and/or absorb sound at selected frequencies.

Abstract: A method for bonding glass components using an encapsulated photo-initiated optical adhesive, and the resulting glass assemblies produced by the same. A mixture containing a catalyst and a resin is provided where at least one of either the catalyst or the resin is encapsulated. The mixture is applied to a glass component. The encapsulated catalyst may then be exposed to ultraviolet light causing the capsules to release the portions contained therein and combine to form an adhesive. A second glass component is then placed on the adhesive so that the adhesive is interposed between the glass components and the adhesive is permitted to cure. Alternatively, the mixture may be exposed to UV light after the second glass component is placed. An exemplary method uses a frame with the first glass component to create a uniform thickness of adhesive and provide a low level of optical defects.

Abstract: A sound absorbing cover is made of foam containing magnetic filler and is integrally molded in a three-dimensional shape so as to cover at least a part of a mating member that is a noise source. The sound absorbing cover includes side walls that cover side surfaces of the mating member and a bottom wall that covers a bottom surface of the mating member that intersects with the side surfaces of the mating member. The magnetic filler is oriented in a thickness direction of each of the side walls and the bottom wall. A sound absorbing assembly includes the sound absorbing cover and a fixing cover that is attached to the outer peripheral surface of the sound absorbing cover and that fixes, to a base, the sound absorbing cover and the mating member that is a noise source covered by the sound absorbing cover.

Abstract: The essence of the present invention is that the thickness of a diffusive fascia of an acoustical treatment is directly correlative of the transition frequency between absorption and pure diffusion. Applicant has found that the thicker the fascia, the lower the transition frequency. For a fascia 600 microns thick, the transition between absorption and diffusion is at about 250 Hz; for a fascia having a thickness of 300 microns, the transition frequency is at about 500 Hz; for a micro-perforated fascia having a thickness of 150 microns, the transition frequency is at about 1,000 Hz; for a fascia having a thickness of 100 microns, the transition frequency is at about 2,000 Hz. An acoustical treatment is created taking these criteria into account. A method of making is also disclosed.

Abstract: A motorized acoustical banner that functions as a variable acoustic absorber is disclosed. The motorized acoustical banner includes a multi-panel fabric banner that allows for adjustable spacing between the layers of fabric as well as between the banner and the wall to which it is mounted. The motorized acoustical banner further includes a drum roller configuration that allows for easily and quickly changing the banner fabric without having to disassemble the entire device. The motorized acoustical banner also includes a tubular motor that can be removed from the device without removing the entire drum.

Abstract: An acoustic structure having multiple degrees of acoustic freedom for reducing noise generated from a source. Acoustic septum caps, which are an integral part of the acoustic structure, include depth control portions that can be varied in width so that the septum portions of different septum caps can be located at different depths within the acoustic structure to provide an acoustic structure having multiple degrees of acoustic freedom even though the acoustic septum caps are anchored at the same depth within the structure.

Abstract: A cavity system that tends to increase the thickness (28) of the shear layer (22), comprising: a cavity (2) and a plurality of rods (4) extending away from the cavity base (3) to a height extending beyond the leading edge (14); the rods (4) being positioned downstream of and in the proximity of the leading edge (14). The rods (4) may extend to different heights and/or be positioned longitudinally offset (e.g. in a zig-zag pattern). The rods may be reversibly movable to a configuration in which they are fully enclosed in the cavity (2) when the cavity (2) is closed. Flow alteration elements (34, 38), for example channels (34) passing through the rods (4) and/or protrusions (38) extending from the rod (4) may be provided on the rods (4).

Abstract: An energy absorber for an overhead system in a vehicle, wherein the energy absorber comprises a sound absorption device. To improve the sound absorption, it is provided that the sound absorption device comprises at least one acoustic membrane formed within a protrusion formed in an energy absorbing panel member.

Abstract: A porous sound absorbing structure according to the present invention includes an outer material 2 having a smooth curved shape, an inner material 3 having an uneven shape with a perimeter thereof combined with a perimeter of the outer material 2 to form a hollow portion S between the outer material 2 and the inner material, and a reinforcing plate material 4 having a large number of through holes 5, the reinforcing plate material being attached to a surface of the inner material 3 on the side of the hollow portion S in such a manner that an air layer is formed between the reinforcing plate material and the surface. A sound absorbing property is given to an interior of the hollow portion S by the reinforcing plate material 4.

Abstract: A metamaterial (400) for attenuating acoustic transmission comprises a plurality of layers (410). Each layer (410) comprises a transmission structure (420) and a resonator (450), coupled to the transmission structure (420). The transmission structure (420) in a layer (410) is coupled to the transmission structures (420) of the layers (410) neighboring said layer (410). The resonator (450) in a layer (410) is coupled to the transmission structure (420) of the layers (410) neighboring said layer (410).

Abstract: The present invention relates to a sound-absorbing material and a method for preparing same. More particularly, it relates to a sound-absorbing material prepared by impregnating a binder into a nonwoven fabric formed of a heat-resistant fiber, having superior sound-absorbing property, flame retardancy, heat resistance and heat-insulating property, thus being applicable to parts maintained at high temperatures of 200° C. or above, to say nothing of room temperature, and being shapeable owing to the binder, and a method for preparing same.

Abstract: An acoustic absorption material may comprise an outer layer and a first layer of batting material proximate to the outer layer. A first layer of room temperature vulcanized silicone (RTV) may be proximate to the batting material. A second layer of batting material may be proximate to the first layer of RTV opposite the first layer of batting material.

Abstract: A method of manufacturing an acoustic attenuation device includes three-dimensionally printing a pair of sheets and webs that cooperate with the sheets to define attenuation chambers. Each chamber has at least one opening through which excited air resonates.

Abstract: A drilling system may include a plurality of robotic drilling units. Each one of the robotic drilling units may include a drill end effector positioned inside a barrel section. The barrel section may be configured as a composite sandwich structure having an inner face sheet. The robotic drilling units maybe operable in synchronized movement with one another to drill a plurality of perforations into the inner face sheet using the drill end effectors in a manner providing a predetermined percent-open-area of the inner face sheet.

Abstract: A honeycomb panel laminate includes a sound absorbing face made of a foam, a sound absorbing layer, and a sound insulating face made of a foam. The sound absorbing layer is composed of a honeycomb material and a layer obtained by filling spaces with a hard foam material. The honeycomb material is bonded to the sound absorbing face by applying an adhesive to edges of the honeycomb material of the sound absorbing layer and pressing the edges against the sound absorbing face so that the edges bite into the foam. The sound insulating face is obtained by applying an adhesive allover a surface of the sound insulating face that makes contact with the honeycomb material and pressing opposite edges of cell walls of the honeycomb material against the sound insulating face so that the opposite edges bite into the surface, having the adhesive, of the foam.

Abstract: Described herein are building products comprising crimped bicomponent fibers and a non-woven fabric, which demonstrate, inter alia, improved acoustical performance. Methods of making and using the building products are also described.

Abstract: A hybrid acoustic absorption and reflection resonator can includes a rigid structure defining a cell, a membrane with at least one orifice attached to the rigid structure, and a back sheet attached to the rigid structure and covering the cell. The membrane is configured to reflect acoustic waves in a predetermined range of frequencies. The rigid structure, the membrane, and the back sheet define a Helmholtz cavity; the Helmholtz cavity is configured to absorb acoustic energy at a frequency within the predetermined range of frequencies.

Abstract: An assembly for managing heat and noise generated by an engine comprises a dash panel, an acoustic absorbing layer, a scrim, and a heat reflective coating. The acoustic absorbing layer comprises a plurality of fibers secure in a resin, where the acoustic absorbing layer is positioned proximate to the dash panel. The scrim is positioned proximate to the acoustic absorbing layer. The heat reflective coating comprises a polymer material and heat reflecting additives dispersed in the polymer material. The heat reflective coating is applied to the scrim as a solution of the polymer material and heat reflecting additives.

Abstract: An acoustic structure, including a pipe having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the pipe, wherein the pipe has at least one opening which permits the plurality of cavities to communicate with an exterior of the pipe, a position of each of the at least one opening in the first direction being a first position.

Abstract: A tunable acoustic panel that functions as an acoustic diffuser and absorber is disclosed. The acoustic properties of the tunable acoustic panel can be quickly and conveniently modified by moving a handle. The tunable acoustic panel is wall-mountable for use as an acoustical room treatment to selectively vary the acoustical response of a room or performance space.

Abstract: A printing device includes a case, a printing unit arranged inside the case, and a sound absorbing body arranged inside the case. The sound absorbing body has parts with different densities including a dense part with a higher density and a non-dense part with a lower density. The non-dense part includes a fibrillated part that is fibrillated into fiber form, and an unfibrillated part that is not fibrillated into fiber form.

Abstract: An acoustic protective cover assembly comprising a porous membrane and an acoustic gasket is disclosed. The porous membrane is bonded to the acoustic gasket at a peripheral region, the membrane is left unhanded at a central region. The acoustic gasket comprises a composite of a porous polytetrafluoroethylene (PTFE) polymer matrix of polymeric nodes interconnected by fibrils, resilient expandable microspheres embedded within the matrix.

Abstract: A sound absorbing body includes a fibrillated part fibrillated into fiber form, and an unfibrillated part that is not fibrillated into fiber form. The unfibrillated part is dispersed inside the single sound absorbing body.

Abstract: An acoustic damping article includes a substrate, wherein the substrate has a surface area S. The acoustic composition further includes a polymer resin. The polymer resin coats partially the surface area with a set of areas. The ratio of the coated areas over the surface area S is less than 1 and the polymer resin coverage is not greater than about 500 g/m2.

Abstract: A soundproofing covering (10) having resonators (30). Said covering (10) comprises a trellis (20) provided with at least two resonators (30) and at least one stud (50) for fastening at least two resonators (30) to a panel (5) that is to be treated, each resonator (30) including a blade (31) extending longitudinally in a plane (P1) from one end (32) of the resonator (30) that is fastened to a stud (50) to another end (33) of the resonator (30), said blade (31) having at least one transverse protuberance (35) for oscillating in an elevation direction (D1) perpendicular to said plane (P1), each stud (50) extending in elevation from a face for securing to the panel (5) that is to be treated towards each resonator (30) fastened to the stud (50), at least one stud (50) having damper means (60) interposed between said face and each of the resonators (30) fastened to the stud.

Abstract: To reduce sound emission and at the same time improve stability, a multilayer board for acoustic insulation is proposed that includes, but is not limited to a core sheet arranged between a first and a second covering layer. At least one of the two covering layers is of a closed design. The core sheet is firmly connected in a planar fashion to the covering layers. The core sheet comprises slits that extend within the core sheet in the direction of the core sheet thickness, which slits reduce the shear stiffness of the board and thus ensure an improved acoustic insulation effect. On both sides the core sheet comprises continuous edge zones, which extend parallel to the covering layers. An aircraft can have an interior lining formed by panels that comprise the multilayer boards in order to provide acoustic insulation.

Abstract: A sound absorber comprising a base body and a tongue (24). The base body has a bottom plate, a wall enclosing the bottom plate and an opening enabling the entry of air into the base body. The tongue has a fixed end, a free end and a central portion disposed between the fixed and the free end. The free end of the tongue is spaced from the wall and the bottom plate, and the central portion of the tongue is disposed to extend at least partially straight along a width direction. Furthermore, a sound absorber assembly can include at least two sound absorbers, and an engine, in particular, for an aircraft, comprising such a sound absorber and/or such a sound absorber assembly.

Abstract: A dynamic responsive acoustic tuning envelope system that includes a movably connected set of cells, each possessing sound reflecting, sound absorbing, and/or electro-acoustic properties, and which are assembled according to the principles of rigid origami. So configured, the system is capable of both localized surficial deformation to alter the material surface exposure, transform its textural profile, and alter the enclosed volume of space in a single material envelope, thereby tuning the acoustics of the environment in which the system resides.

Abstract: Two sheets of nonwoven fabric with the same shape and size each including a rectangular body 11a and a funnel-shaped projection 11b projecting from one side of the body 11a are stacked, and bonded together by heat welding at each side of the body 11a except the projection 11b and both sides of the projection 11b. Joint portions 13a, 13b, 13c, and 13d projecting inward from a joint 13 are located on three sides and four corners of the body 11a except the side provided with the projection 11b, and project to depths at which the joints do not interfere insertion of a nozzle 16 into a center portion of the bag. The nozzle 16 is inserted through an opening 15 of the projection 11b, and the bag is filled with a granular elastic material 12. Then, the projection 11b is removed, and the opening is closed.

Abstract: An acoustic panel for diffusing sound waves, the acoustic panel comprising: a panel front surface and a substantially opposed panel back surface; the panel front surface defining a plurality of front surface regions each delimited by a respective front surface region perimeter, each of the front surface regions being curved. The sound waves incoming at the panel front surface are diffused by the panel front surface.

Abstract: A hybrid acoustic absorption and reflection resonator can includes a rigid structure defining a cell, a membrane with at least one orifice attached to the rigid structure, and a back sheet attached to the rigid structure and covering the cell. The membrane is configured to reflect acoustic waves in a predetermined range of frequencies. The rigid structure, the membrane, and the back sheet define a Helmholtz cavity; the Helmholtz cavity is configured to absorb acoustic energy at a frequency within the predetermined range of frequencies.

Abstract: The invention relates to a broadband sound absorber (1) which comprises a sound-absorbing filler material between two microperforated film webs (2) which are contiguous on their edges, said filler material optionally containing heavy fillers. The broadband sound absorber (1) achieves excellent acoustic insulation and has microperforations (4) all over or only in sections, said filler material optionally containing heavy fillers (mass density) and one or both microperforated film webs (2) having the same thickness across their surface or thickened portions (3, 5) of the same or a different material in some sections.