Abstract: A housing for a phased array monostatic sodar system with a transducer array that emits and receives multiple generally conical main beams of sound along different primary axes. The housing includes one or more upwardly-directed sidewalls that define a volume between them that is open to the atmosphere at the top, to emit and receive the beams, and an upper lip at the top of at least one wall, defining a curved perimeter at the top of at least some of the volume that closely conforms to the shape of at least one main beam at the location of the lip. The sidewalls are lined with a non-woven fiber based sound-absorbing material.

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 provides an interlayer film for laminated glass, that exhibits an excellent sound-insulating performance for solid-borne sound in an environment at or below 0° C. Another object is to provide laminated glass that is obtained using this interlayer film for laminated glass. The present invention is an interlayer film for laminated glass, that has a sound-insulating layer for which a temperature T1, which is the temperature that gives the maximum value of tan ? at a frequency of 1 Hz, is in the range from ?30° C. to 0° C.

Abstract: The present invention relates to a light laminated acoustic absorption sheet. The light laminated acoustic absorption sheet with flame retardant is characterized in that one or more thermoplastic fibers (a) having a low melting point and selected from polyethylene, polypropylene, polyvinyl chloride, polyester, polyethylene-polyester copolymers, and one or more polyester interlaced-textured yarns or thermoplastic hollow fibers (b) having a higher melting point than the thermoplastic fiber (a) and selected from polyester, polyethylene, nylon, hot-meltable fluororesin are mixed and opened so as to prepare a mat, and two or more sheets of mats are laminated by using an apparatus of manufacturing a stampable sheet so as to manufacture the laminated sheet, and then the laminated sheet is impregnated with flame retardant liquid.

Abstract: A device or system through which fluid is adapted to flow, such as, for example, a fluid-carrying conduit, flow control valve, or fluid expansion device including, for example, a steam turbine or fluid expander, according to which acoustic energy is generated by, or present within, the device or system and the acoustic energy is attenuated.

Abstract: The invention relates to a lightweight sound insulating lining (1) for a body component of a motor vehicle, in particular in the form of a lightweight front wall lining, comprising a sound absorbing layer, a sound insulating layer which is directly connected to the sound absorbing layer and substantially air tight, as well as an adjoining foam layer (1.3), wherein the sound absorbing layer (1.1) is made of a porous absorber, preferably a fiber fleece or a foam, which has an air permeability in the range of 150 to 2000 liters/m2s at a test pressure of 100 Pa. The sound insulating layer (1.2) is formed by an integral skin layer of the foam layer (1.3) with a thickness of at least 0.5 mm, and is integrally joined to the porous absorber by back-foaming the porous absorber substantially without foam penetration therethrough. Furthermore, a method for manufacturing such a lining is disclosed.

Abstract: An acoustic protective panel for the fitting of a wall of a vehicle, has an upper porous layer, in particular with a felt or remelted flexible foam base, at least one zone of the porous layer being arranged on one sealing layer, the sealing layer being arranged on one backing layer (5) with a flexible polyurethane base forming a spring, said sealing layer being formed by impregnation on a portion of the thickness of the porous layer by the polyurethane of the backing layer overmolding the porous layer. Architectures for mounting such a panel are described.

Abstract: A sound damping material for use in a sound damping laminate having one or more rigid layers, such as those used in the automotive industry. The sound damping material is preferably a viscoelastic material that damps or otherwise inhibits the transmission of vibrational or acoustical energy through the laminate, and also acts as an adhesive for bonding the rigid layers together. In its cured form, the sound damping material layer can include an acrylate-based polymer matrix, and one or more of the following components: a precipitated phase, a viscous phase, and miscellaneous constituents. The acrylate-based polymer matrix is the reaction product of at least one acrylate-based monomer, such as isobornyl acrylate.

Abstract: The present invention relates to a soundproof cover for automobiles, the soundproof cover including: a cover body formed of a metal or a resin; and a sound-absorbing material disposed opposite to a sound source, in which the sound-absorbing material has a soft sound-insulating layer on a surface side thereof facing the cover body, the sound-absorbing material is disposed apart from the cover body, and the sound-absorbing material has a peripheral edge that contacts with an inner wall of an edge of the cover body.

Abstract: The invention relates to a multilayered acoustically and thermally effective insulation having a defined layer structure, especially for internal combustion engines of motor vehicles.

Abstract: An acoustic resonator adaptable to a sound chamber is designed to decrease a sound pressure while increasing a particle velocity of medium particles in a low frequency range without increasing the overall size thereof. The acoustic resonator is constituted of a pipe member having one opening end and a resistance member embracing a high resistance region and a low resistance region. The resistance member is inserted into the pipe member such that one end thereof matches the opening end of the pipe member whilst the other end thereof is disposed at a predetermined position inside a hollow cavity of the pipe member. The high resistance region embraces an antinode region of the particle velocity distribution with respect to a standing wave occurred in the hollow cavity at a resonance frequency, thus causing an acoustic phenomenon decreasing the resonance frequency compared to a single unit of the pipe member.

Abstract: A cooling system includes a plurality of fans and a fan bracket accommodating the fans. Each fan comprises a fan intake and a fan outlet. The fan bracket defines a plurality of air inlets and a plurality of air outlets therein. The fan bracket is provided with a fan guard in each air outlet and a plurality of noise-reducing holes in the fan guard. The air inlets of the fan bracket communicate with the fan intakes and the air outlets of the fan bracket communicate with the fan outlets, respectively. Airflow generated by the fans through the fan outlets comprises a portion exiting through the noise-reducing holes.

Abstract: A moldable acoustic facing comprises cellulosic fibers and synthetic fibers entangled together. The acoustic facing has a basis weight of from about 1.5 to about 5.0 ounces per square yard (osy), a thickness of less than about 0.050?, a mean pore size of between about 8 microns and about 40 microns, and an elongation at break of at least twenty percent. The acoustic facing includes less than about five percent synthetic microfiber and has an acoustic resistance of at least about 250 Rayls.

Abstract: A sound barrier and method of sound insulation are disclosed. In one aspect of the disclosure, a sound barrier comprises a first, solid medium, such as a viscoelastic solid and a second medium, such as air. At least one of the two media forms a periodic array disposed in the other medium. The solid medium has a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, the speed of propagation of longitudinal sound wave being at least about 30 times the speed of propagation of transverse sound wave.

Abstract: An improved acoustically and thermally insulating composite material suitable for use in structures such as buildings, appliances, and the interior passenger compartments and exterior components of automotive vehicles, comprising at least one airlaid fibrous layer of controlled density and composition and incorporating suitable binding agents and additives as needed to meet expectations for noise abatement, fire, and mildew resistance. Separately, an airlaid structure which provides a reduced, controlled airflow therethrough useful for acoustic insulation is provided, and which includes a woven or nonwoven scrim.

Abstract: A tire noise reduction device including a noise absorbing member made from a porous material that is formed into a band, the band being disposed along a tire circumferential direction on an inner surface of a tread portion of a pneumatic tire, wherein the noise absorbing member is wound so as to be laminated with two layers or more on at least a part of the tire circumferential direction to form a circular body, a crossing section where an inside layer and an outside layer of the noise absorbing member interchange is provided in at least one location on a periphery of the circular body, and the ends of the longitudinal direction of the noise absorbing member are disposed inward of the outermost layer of the noise absorbing member.

Abstract: The invention relates to sound-absorbing devices, assemblies and systems and corresponding methods for altering the reverberation time of a room, specifically although not necessarily exclusively at low frequencies. A sound-absorbing device according to the invention comprises basically a body containing one or more cavities (4), where at least a portion of the outer surface of the body is in contact with said sound field S and where said body is inflatable/extendable and collapsible/compressible during the supply of a gas to or the removal of the gas from said at least one cavity (4), respectively, whereby the absorption coefficient (a) and/or the resonance frequency of said body can be varied, thus determining the absorption coefficient and/or the frequency region in which maximum absorption will take place.

Abstract: An acoustic material is intended to be mounted behind a loudspeaker 8 to decrease the resonant frequency and/or to reduce the back volume. The acoustic material includes a woven or non-woven fabric which supports highly porous particles or fibers such as particles of carbon black. The woven or non-woven is thin and light to avoid damping sound, whilst still being capable of retaining the porous material. The use of a flexible acoustic material allows the material to be more easily included with loudspeakers in portable mobile devices.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: An improved acoustically and thermally insulating fire-retardant composite material suitable for use in structures such as buildings, appliances, and the interior passenger compartments and exterior components of automotive vehicles is provided. The material is comprised of at least one airlaid fibrous layer of controlled density and composition and incorporating suitable binding agents and additives as needed to meet expectations for noise abatement, fire-retardancy, and mildew resistance. Separately, an airlaid structure which provides a reduced, controlled airflow therethrough useful for acoustic insulation is provided, and which includes a woven or nonwoven scrim. A process for the production of the fire retardant nonwoven material is also provided.

Abstract: According to one aspect of the present invention there is provided an acoustic laminate including: a first layer of viscoelastic acoustic barrier material; a sound absorbing/decoupling batt affixed to the first layer of viscoelastic acoustic barrier material, the batt at rest defining a batt plane; the batt including a plurality of batt fibers; the batt further including retaining fibers, wherein the batt fibers and/or retaining fibers are disposed perpendicular to the batt plane and having end portions thereof disposed at a batt surface, the end portions affixed to the viscoelastic barrier material so that either the first layer of viscoelastic acoustic barrier material or the sound absorbing/decoupling batt itself may be retained in spaced relation from a mounting surface when the laminate is so mounted, the retention being achieved in any orientation by bearing a mass load of the batt or first layer of viscoelastic material along the axis of the affixed batt fibers and/or retaining fibers.

Abstract: A non-woven material, that can be formed into an acoustic ceiling tile, is provided. The material includes a substantially planar and self-supporting core of an inorganic base fiber and a synthetic thermal bonding fiber. The synthetic thermal bonding fiber preferably has an increased bonding surface area that improves adhesion and porosity to provide a base mat or core with a low density to provide sound absorption required by an acoustic ceiling tile.

Abstract: To provide an inexpensive, slender sound absorber, it has a plurality of porous layers or regions of different densities and different flow resistances respectively. Of significance are the boundary surfaces between the different, porous layers which are accompanied by changes in impedance. Homogenized and adapted flow resistance conditions should be avoided. Although the thermal frictional effect in the porous material is desired, in particular to absorb higher frequencies, according to the present invention it only forms one element of the absorptive working mechanism. In addition, the effect known in physics as refraction is used. At the boundary layer between two materials of different density and different flow resistance respectively there is an abrupt change in impedance. This leads to a phase shift of the sound wave, and so a sound absorbing effect is made possible.

Abstract: A method for optimizing sound and vibration comfort in a mobile passenger compartment, the method applied by a design team to carry out overall design of the passenger compartment and/or by at least one equipment supplier to carry out design of a portion of the passenger compartment. The method establishes target values to be achieved for well-identified comfort indices, defines requirements and input data relating to plural equipment suppliers to obtain a totality of information relating to the passenger compartment, estimates values of the comfort indices and compares them with the target values, and then modifies individually or in combination the input data to correlate them with the target values.

Abstract: A capsule contains fluid and a solid inertial mass that is free to move within the capsule. The capsule is embedded in a foam panel. A plurality of such foam panels are attached to the internal wall of a launch vehicle fairing. This device augments acoustic energy dissipation with damping the resonant frequency of the fairing to reduce the amount of energy that is transmitted into the acoustic volume contained within the wall. Incorporating a plurality of capsules respectively tuned to many frequencies provides broadband structural attenuation. This abstract is provided to comply with the rules requiring an abstract, and is intended to allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: An improved acoustically and thermally insulating fire-retardant composite material suitable for use in structures such as buildings, appliances, and the interior passenger compartments and exterior components of automotive vehicles is provided. The material is comprised of at least one airlaid fibrous layer of controlled density and composition and incorporating suitable binding agents and additives as needed to meet expectations for noise abatement, fire-retardancy, and mildew resistance. Separately, an airlaid structure which provides a reduced, controlled airflow therethrough useful for acoustic insulation is provided, and which includes a woven or nonwoven scrim. A process for the production of the fire retardant nonwoven material is also provided.

Abstract: A vehicle flooring system with improved thermal and acoustic properties is provided that does not unreasonably increase the thickness and weight of the flooring system and does not break down due to repeated exposure to high temperatures and wide ranging temperature fluctuations. Various materials and construction methods are combined to provide a system with optimized thermal conductivity, having varied density ratios of materials to meet particular sound transmission loss profiles. These materials include a wide range of foam and other materials.

Abstract: The invention relates to an acoustic panel assembly. There is a need for a simple and inexpensive acoustic panel assembly. An acoustic panel assembly includes a rigid panel with an opening. The panel has an edge rib surrounding the opening, and a wall spaced apart from and surrounding the edge rib. The panel assembly also includes a frame member and a sound control sheet. The frame member has an outer border and a plurality of cross-pieces extending between different parts of the border. A compression rib projects forwardly from an inner edge of the border. The sound control sheet is mounted in and fills the opening. The sheet has an outer edge portion held between the rib of the rigid panel, the wall of the rigid panel, the border of the frame and the compression rib of the frame. The compression rib projects into a rear side of the sheet. The sheet forms a shoulder. The shoulder and the edge rib form a coach joint. The frame cross-pieces engaging a rear surface of the sheet.

Abstract: An assembly is provided for reducing the noise that is generated in the heating gas zone by turbofan engines. The assembly consists of an acoustically absorbent cladding in the heating gas flow channel of the turbofan engine. The cladding includes a plurality of neighboring cavities, into each of which four horns extends. The mouths of the horns are fixed to a perforated cover sheet. The cover sheet forms one wall of the heating gas flow channel.

Abstract: An acoustic damping composition includes a binder resin including an addition polymer having a carboxylic functional group and a urethane component. The acoustic damping composition has a Mode 1 Damping Parameter of at least 0.45.

Abstract: A ceiling panel assembly is provided, including: a sound damping layer including a constraining layer and a first viscoelastic layer; and an acoustical absorption layer coupled to the sound damping layer. A suspended ceiling assembly is provided, including: a support structure attached to a structural ceiling of a room, the support structure including a plurality of support flanges; and a plurality of ceiling panel assemblies, each ceiling panel assembly positioned on the support flanges and comprising a sound damping layer including a constraining layer and a first viscoelastic layer. A method of manufacturing a ceiling panel assembly is provided, the method including: providing a sound damping layer including a constraining layer and a viscoelastic layer; and applying an acoustical absorption layer to the sound damping layer.

Abstract: An acoustic inner barrel for an aircraft engine nacelle inlet is constructed from a composite material and is formed as a single, 360-degree annular segment. The barrel includes an inner skin, an outer skin, a cellular core disposed between the inner skin and the outer skin, and at least one crack and delamination stopper extending radially from the inner skin to the outer skin.

Abstract: A laminated panel is provided including a first layer of material having external and internal surfaces; a second layer of material having external and internal surfaces; a layer of viscoelastic glue in contact with the internal surface of said first layer of material and with the internal surface of said second layer of material; said glue including an acrylic polymer in a concentration between 10% and 60% by weight, or a tackifier in a concentration between 1% and 70%; or a plasticizing compound in a concentration between 0% and 15%; or a material with Tg greater than 0° C. in a concentration between 0% and 30%. A soundproof assembly is also provided including a first and second panel; at least one spacer between the panels, and a gap between the panels, wherein at least one of the panels comprises a laminated panel as provided above.

Abstract: Disclosed is a sound-absorbing material, which has a flow resistivity R of 3.3×104 N·s/m4 or more, a Young's modulus E of 1.2×103 to 2.0×104 N/m2, and a loss factor ? of 0.12 or less. The sound-absorbing material of the present invention can enhance a sound absorption capability in a wide range of a low/intermediate-frequency region to a high-frequency region at a higher level as compared with conventional sound-absorbing materials.

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 damping device and a method of damping a structural element of a vehicle body are disclosed. The damping device generally includes a carrier material, a separating material, and a damping material disposed on the carrier material. The damping material is one of a material forming an open cell structure and a material having an absorption coefficient for sound waves greater than about 0.5. The method generally includes fixing a damping device on a structural element of a vehicle, the damping device including a carrier material, a separating material, and a damping material, and one of expanding and dilating at least one of the separating material and the damping material, the damping material having one of an open cell structure and an absorption coefficient for sound waves greater than 0.5 after expansion.

Abstract: An absorbent structure for reducing the propagation of soundwaves emitted by noisy devices such as rotors or motors, the structure includes a rigid partition (1), at least one porous wall (4), and separator elements (2) for placing the porous wall (4) at a determined distance from the rigid partition (1), defining cavities (3) of a height h1 between the porous wall (4) and the rigid partition (1), the height h1 being determined to obtain maximum absorption of a given frequency of the emitted soundwaves, wherein includes additional absorption elements for obtaining maximum absorption of at least one additional frequency of the emitted soundwave.

Abstract: Acoustic element (1) has a flat, sound-receiving, front face (2) which extends in the XY plane and has a good sound-absorption coefficient, and the element is formed of a bonded batt of air laid mineral fibres having a density of 70 to 200 kg/m3 wherein the fibres extend from the front face (2) and at least through the front half of the thickness of the batt have a Z direction component greater than the Z direction component of conventional air laid products, and the front face of the batt is a cut and abraded face. The element can be made by air laying mineral fibres and binder, reorienting the fibres to provide an increased fibre orientation in the Z direction, curing the binder to form a cured batt and cutting the cured batt in the XY plane into two cut batts and smoothing each cut surface by abrasion to produce a flat face on each cut batt.

Abstract: The object of the present invention is to provide a soundproofing material that is lightweight and has sufficient soundproofing performance. The present soundproofing material includes a frame body including a planar portion and a wall body installed upright on the planar portion and a soundproofing laminate accommodated in a laminate accommodating portion surrounded by the wall body, and the soundproofing laminate has a hard layer consisting of a rubber sheet or the like and a soft layer whose one side of the soft layer is laminated on the hard layer and consists of a felt, a resin foam or the like, and another side of the soft layer is joined to at least one of the planar portion and/or the wall body of the frame body, and a side surface of the soundproofing laminate and a side surface of the wall body are distant from each other. The distance thereof is preferably in the range from 0.3 to 1 mm.

Abstract: An acoustic panel for reducing the transmission of noise therethrough is provided. The acoustic panel may include a sound-absorbing surface with a plurality of convex and concave structures. The convex and concave structures may be organized in a regular array and may be spatially arranged to be alternating with one another. A dishwasher may use such an acoustic panel including a panel of sound absorbing material by placing such a panel inside the door, in or around the walls of the tub of a dishwasher, or the panel can also be used to reduce the transmission of noise with other products. A method of inserting a panel of sound-absorbing material into the door of a dishwasher is also provided. The panel may include protrusions extending from one of its surfaces in order to engage a supporting surface of the product to which it is attached.

Abstract: A cover part for a vehicle, especially an underbody cover, has a porous core layer and at least one cover layer on each side, wherein the porous core layer is constructed such that it has acoustic transparency or an acoustically absorbent effect. Here, the porous core layer is made either from a thermoplastic matrix with embedded reinforcement fibers, especially glass fibers, whose melting point temperature is higher than the melting point temperature of the plastic matrix, or from a foam, which is either open-cell or closed-cell and perforated. The acoustically absorbent porous core layer is occupied on one or both sides with one or more acoustically transparent or absorbent covering layers.

Abstract: Multilayer articles having acoustical absorbance properties are disclosed. Methods of making and using the multilayer articles are also disclosed.

Abstract: A porous sound absorbing structure 10 includes an exterior plate 1 and a closing plate 2 in order to suppress a decrease in sound absorbing performance in a wide frequency band. An interior plate 3 is arranged between the exterior plate 1 and the closing plate 2, and air layers 4 and 5 are located between the exterior plate 1 and the interior plate 3 and between the interior plate 3 and the closing plate 2 respectively. The exterior plate 1, the interior plate 3, and the closing plate 2 are arranged while opposed to each other. Many through holes 1a and 3a are made in the exterior plate 1 and the closing plate 2 respectively. In the interior plate 3, a plate thickness t2 and a diameter ?2 and an aperture ratio ?2 are set so as to generate an viscous effect in air passing through the through hole 3a. The aperture ratio ?1 of the through hole 1a in the exterior plate 1 is set more than 3% and not more than 50%.

Abstract: A method of making a sound insulating layered composite structure by roll coating a padding layer with an emulsion which may then be solidified to form a layer disposed over at least a portion of the padding layer. The emulsion may be applied using various devices and applied at thicknesses as to provide the capability to tune the acoustic performance of the composite.

Abstract: Sound absorbing board (10) is made from recycled high density foam granulate (12) that has been mixed with a binder (14) and consolidated under pressure. Pores (16) are present in spaces between the granules. Each granule includes small pores (18). Sound is absorbed by thermal diffusion and viscous friction.

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: An acoustically treated exhaust centerbody comprising a body including a body fore portion and a body aft portion. An internal passageway extends through the body in the axial direction. A resonator in the body fore portion includes a plurality of acoustic chambers. A plurality of ribs in the resonator form fore/aft walls of the acoustic chambers. Each rib is shaped substantially as a section of an annulus. A plurality of radial fins extend between adjacent ribs. The fins form sidewalls of the acoustic chambers. A skin overlies the acoustic chambers and forms an outer surface of the resonator.

Abstract: An acoustic protective panel for the fitting of a wall of a vehicle, has an upper porous layer, in particular with a felt or remelted flexible foam base, at least one zone of the porous layer being arranged on one sealing layer, the sealing layer being arranged on one backing layer (5) with a flexible polyurethane base forming a spring, said sealing layer being formed by impregnation on a portion of the thickness of the porous layer by the polyurethane of the backing layer overmoulding the porous layer. Architectures for mounting such a panel are described.

Abstract: A set of acoustic components having complementarily tessellated shapes such that they may be nested together to constitute a rectangular parellelepiped, suitable for efficient storage and shipping. Each component also has a flat side. The shape set is further defined such that many aesthetically attractive, sculpture-like configurations may be created through installation of the components on a flat surface of a building such as a wall or ceiling, while substantially modifying the acoustic properties of the building feature. Acoustically absorptive, reflective, and diffusive components can be used in combinations with each other in order to achieve desired acoustic treatment of the building feature. Several methods of fabrication of the acoustic components are disclosed.

Abstract: A sound muffling material for use in combustion engine exhaust mufflers is provided. The material includes volumized fibers retained in compressed form by a material of lower softening temperature than the fibers. When the material is heated by exhaust gases, the material of lower softening temperature is softened allowing the compressed fibers to expand. The fibers may be formed into a knitted fabric retained by a sacrificial thread. The material may be used to support catalyst bricks.