Abstract: The present invention relates to the acoustic metamaterial structural unit with the function of soundproof, flow-passing and heat-transferring enhancement, which comprises a frame, a constraint placed in the frame and a piece of membrane covering at least one surface of the frame; both the frame and the membrane are respectively placed at least one hole. Besides, the present invention also provides the acoustic metamaterial composite plate and the composite structure constructed with the acoustic metamaterial structural unit; the method for adjusting the frequency and the assemble method. The present structural unit possesses better soundproof property than the routine perforated plated or micro-perforated plate in broad operating frequency. And also the enough heat flow, gas flow or fluid flow can pass through smoothly.

Abstract: An example acoustic tile is disclosed having a structure with at least one layer. A plurality of openings are formed in the at least one layer of the structure. The openings are configured to direct sound waves hitting the structure in multiple different directions through the at least one layer to absorb a majority of the sound waves and inhibit the sound waves hitting the structure from reflecting off of the structure. In an example, the openings are juxtaposed, different sizes, different orientations, and/or different numbers of openings on separate layers.

Abstract: A noise shielding structure is provided that is highly versatile with no limitation to vehicle models and bumper designs, and effectively reduces road noise in the rear compartment. The noise shielding structure includes: an outer panel at a rear vehicle body; a rear bumper provided so as to cover the outer panel; and a noise shield arranged between the outer panel and the rear bumper, wherein the noise shield includes a fixed portion to be fixed to the outer panel and a flap portion to contact the rear bumper when the rear bumper is attached to the rear vehicle body, and the flap portion is deformable on a hinge of the noise shield provided between the fixed portion and the flap portion.

Abstract: Moulded three-dimensional noise attenuating trim part for a vehicle, comprising at least a three layer system consisting of a first porous fibrous layer and a second porous fibrous layer and an air permeable intermediate film layer situated between the first and second porous fibrous layers and wherein the adjacent surfaces within the three layer system are interconnected, wherein the second porous fibrous layer has an area weight AW2 that is varying over the surface and wherein at least for areas of the three layer system with a total thickness t between 5 and 35 mm, the area weight AW2 relates to the total thickness t of the three layer system as following 25*t+175<AW2<45*t+475 wherein t is in mm and AW2 is in g·m?2 and wherein the area weight AW2 of the second porous fibrous layer is increasing with increasing total thickness t of the three layer system.

Abstract: A shaped acoustic absorber assembly is provided with broadband absorption. The assembly includes an acoustic panel defining a plurality of apertures, and a plurality of tubular quarter-wavelength resonators of variable lengths provided respectively aligned with the plurality of apertures and coupled to the acoustic panel. Each tubular quarter-wavelength resonator includes at least one perimeter boundary wall extending in a longitudinal length direction and defining a chamber cavity having a chamber volume. A first end defines an opening aligned with one of the plurality of apertures and coupled to the acoustic panel. A second end is provided opposite the first end, and is sealed and configured for being located adjacent a target substrate. Methods are provided for shaping the tubular quarter-wavelength resonators to coordinate with a geometry and dimensions of a target substrate and then preserving a shape of the tubular quarter-wavelength resonators in a structurally rigid configuration.

Abstract: A first ventilation duct line has a first portion having a first sectional area, a second portion having a second sectional area larger than the first sectional area, and a third portion having an inclined inner face connecting the first portion and the second portion to each other. Further, there is a second ventilation duct line having an opening portion positioned on an inner side of the first portion of the first ventilation duct line.

Abstract: A system for crown molding that enables safely incorporating electrical and communications cabling within crown molding by creating one or more protected paths which inherently prevent overly sharp bends in crown molding corners and by mitigating damage from penetrating punctures through a decorated face designed to fracture when improperly penetrated by a screw or nail, and enables the secure installation of hardware either concealed within the molding or securely and favorably positioned through the decorative face to view or sense a room, and enables additional cable capacity that is concealed within a light reflector to increase lighting efficacy as well as power and data delivery capacity.

Abstract: A sound absorbing panel for managing acoustic environments with desired durability, stiffness and advantageous characteristics for self-supporting sound-absorbing panels intended to be attached to indoor walls and ceilings of buildings. The sound absorbing panel comprising a height, a width, a length and a cover. The sound absorbing panel comprising materials characterized by an inner core comprising a core density, a core binder and a thickness. The core density is between two and a half and four and a half pounds per cubic-foot. The core binder is between one and three-fourths and two and three fourths percent. The thickness comprises a thickness between 35-45 mm. The cover comprises a cover weight. The cover weight is between one quarter and one half ounces per foot.

Abstract: Systems and methods for a transducer assembly for a vehicle having a resonating surface. The transducer assembly comprising a housing, a spacer connected to the housing, and a piezoelectric assembly disposed between the spacer and the housing. The spacer is configured to connect to the resonating surface to form an air gap between the resonating surface and the piezoelectric assembly.

Abstract: A sound attenuation panel that includes an incident wall and a frame unit connected to the incident wall. The incident wall defines an aperture therethrough. The frame unit includes multiple spoke members spaced apart from one another and radially extending from one or more central hub openings of the frame unit. The one or more central hub openings align with the aperture of the incident wall. The frame unit defines channels between adjacent pairs of the spoke members. The channels fluidly connect to the one or more central hub openings. The frame unit is configured to receive sound waves into the central hub opening through the aperture of the incident wall to dissipate the sound waves through the channels between the spoke members.

Abstract: A method of shielding acoustic wave, which is capable of completely shielding sound while reducing consumption of a shielding material is provided. The method of shielding acoustic wave, includes covering an object to be shielded with a first shielding material so that a lower portion of the object to be shielded is opened, covering an upper portion of the first shielding material by using a second shielding material which is an acoustic wave meta material having same absolute value but negative sign in density and bulk modulus comparing to the first shielding material, and covering the second shielding material with a third shielding material.

Abstract: A motor-vehicle underbody liner, encompassing a planar porous open-cell carrier component; the carrier component being embodied for mounting onto a motor-vehicle underbody and for being carried along therewith; the carrier component including an installation side that faces toward the motor-vehicle underbody during operation as intended, and a liner side that faces away from the motor-vehicle underbody during operation as intended; the carrier component being adjusted, by suitable densification of its open-cell material, to a sound absorption behavior having a sound absorption maximum in a frequency range from 800 Hz to 1250 Hz; there being arranged on the installation side of the carrier component an additional absorber component having a sound absorption behavior whose sound absorption maximum is also located in a frequency range from 800 Hz to 1250 Hz.

Abstract: An improved sound reducing panel is disclosed comprising a front porous sheet for enabling sound to enter into the sound reducing panel and a rear non-porous sheet. A sound absorbing member dissipates sound entering into the front porous sheet. A sound blocking member blocks sound from exiting from the sound absorbing member. A decoupling member reduces sonic vibration from being transferred from the sound blocking member to the rear non-porous sheet.

Abstract: A soundproof structure has two or more soundproof units. Each of the soundproof units has an outer shell having a cylindrical shape, has a hollow inner space inside the outer shell, and has a first opening portion opened to outside on a surface that is one end portion of the outer shell in an axis direction of the cylindrical shape. The two soundproof units adjacent to each other are disposed in the axis direction such that the first opening portions face each other. The first opening portions facing each other are spaced apart from each other in the axis direction. An average distance in the axis direction between the first opening portions facing each other is less than 20 mm. Accordingly, there are provided a soundproof structure and a soundproof system which can insulate sounds on the low frequency side with a simple configuration, are small and lightweight, and can easily change the frequency characteristics.

Abstract: An improved cell structure that enables design improvements to acoustic panels is provided. The provided cell structure for an acoustic panel is (i) capable of damping a wider range of audible frequencies, (ii) able to be easily combined and integrated into a variety of panel dimensions, and (iii) manufacturable using additive manufacturing techniques such as direct metal laser sintering (DMLS).

Abstract: An arrangement for reducing the radiation of noise from liquid-cooled transformers or chokes includes a tank having stiffeners arranged outside on the side walls of the tank, where a region situated between each stiffener is covered by a sandwich panel that is fastened to each stiffener, where each sandwich panel has a metallic wall that hermetically closes off a cavity that is filled with a composition composed of a polymer material and a filler material, where the composition has a specific weight of >2 grams per cubic centimeter.

Abstract: An acoustic material comprising one or more acoustic composite layers; and a facing layer, wherein the one or more acoustic composite layers are formed of a nonwoven sound absorption material; wherein the facing layer is permeable; and wherein the facing layer is attached to a top surface of the one or more acoustic composite layers. The facing layer may optionally include metallic components or a metallized outer surface. The acoustic material may optionally include a pressure sensitive adhesive material on an opposing side of the one or more acoustic composite Sayers to enable installation of the acoustic material. The facing layer may include a permeable scrim, a perforated film, or a perforated foil. The facing layer may be metalized on its top exposed surface to provide infrared heat reflection, and a corrosion resistant coating may be applied on top of the metalized layer if required to stabilize the metal coating.

Abstract: An integrated microphone device is provided. The integrated microphone device includes a substrate, a plate, and a membrane. The substrate includes an aperture allowing acoustic pressure to pass through. The plate is disposed on a side of the substrate. The membrane is disposed between the substrate and the plate and movable relative to the plate as acoustic pressure strikes the membrane. The membrane includes a vent valve having an open area that is variable in response to a change in acoustic pressure.

Abstract: An acoustical vinyl tile having an integral acoustical layer is disclosed. The vinyl tile includes a vinyl portion and an acoustical portion. The acoustical portion may comprise a crumb rubber component and a polyurethane foam component. The acoustical portion can include 10-40% crumb rubber and 60-90% polyurethane foam. The acoustical portion may comprise a plurality of individual layers, the combination of which is customized to the particular sub-floor structure to which the tile will be adhered or overlain. The individual layers of the acoustical portion can include any of a variety of combinations of rubber, cork, polyurethane foam, and the like. The resulting tile meets one or more of ASTM E 2179, ASTM E 989, ASTM E 492, and ASTM E1007 IIC sound requirements. A method of designing the disclosed tile to suit a particular flooring application is also disclosed. Other embodiments are described and claimed.

Abstract: Multilayer sound attenuating trim part for a vehicle, in particularly for a trim part or cladding used in the interior of a car, for instance as an inner dash or as part of the floor covering or for the exterior of a vehicle, for instance as a trim part or cladding in the engine bay area or as part of an under body trim part as well as to the method of producing a part, comprising at least two fibrous layers (10, 30) and at least one air permeable intermediate film layer (20) between the at least two fibrous layers, whereby all layers together have a variable thickness.

Abstract: A hyperdamping inclusion under constraint with large, broadband frequency damping properties is disclosed. The inclusion includes materials under near-buckling constraint such that fundamental eigenfrequency vanishes at near-buckling.

Abstract: A core for a fire rated door includes a fire resistant center panel and an extruded fire resistant border. The fire resistant center panel has a bottom, a top, a first side, a second side, a first end and a second end. The fire resistant center panel is made of a first fire resistant material. The extruded fire resistant border is attached to the first side, the second side, the first end and the second end of the fire resistant center panel. The extruded fire resistant border is made of a second fire resistant material having a higher density than the first fire resistant material.

Abstract: A cover for protecting an audio port of an electronic device is provided. The cover includes a check valve, a bellows, and an air vent. The check valve moves between a first position to allow audio pressure to exit the audio port and a second position to fluidly seal the audio port. The bellows at least partially surround the audio port when the cover is attached to the electronic device and move the check valve from the first position to the second position in response to a pressure exerted on the bellows. The air vent is attached to the bellows and allows audio pressure to pass through the air vent and to restrict passage of at least some water through the air vent.

Abstract: An impedance tube and sample tube holder that includes a hollow tube, a first tube, a second tube, and a spool. The hollow tube has two halves which are detachable and can hold spacers and a sample. The first tube includes a first tube speaker end and a first tube spool end. The first tube has a speaker disposed at the first tube speaker end and microphones. The second tube includes an anechoic terminator tube end and a second tube spool tube. The second tube has microphones and an anechoic terminator at the anechoic terminator tube end. The spool holds the hollow tube with the spacers and the sample. The spool is attachable to the first tube spool end and the second tube spool end such that the sample is perpendicularly orientated to an incoming sound wave produced by the speaker.

Abstract: A laminated composite interior component including: a first member that has a predetermined mating surface; and a second member made of an elastically deformable resin material and having a plate portion that is generally parallel to the mating surface, the plate portion being integrally provided with a large number of projections that project toward the mating surface such that a space is formed between the mating surface and the plate portion, the second member being disposed so as to be placed on the first member with the projections contacting the mating surface, in which the large number of projections have the same shape as each other, and are configured such that a flexural rigidity of each of the projections against a compressive load is anisotropic around an axis so that the projections are each to be deflected in one direction around the axis, the large number of projections are disposed on line segments that define a shape of a large number of arrangement units in accordance with an arrangement pat

Abstract: Disclosed are methods, devices, apparatuses, and systems for ultrasonic fingerprint sensing with an acoustic shielding structure. One or more layers in an ultrasonic fingerprint sensing system may reflect back ultrasonic waves due to acoustic impedance mismatch that can distort a fingerprint image. An acoustic shielding structure may be configured to absorb, store, trap, or otherwise attenuate ultrasonic waves. The acoustic shielding structure may be positioned underlying an ultrasonic sensor layer. In some implementations, the acoustic shielding structure may include a plurality of periodically spaced apart geometric features or holes in a medium.

Abstract: A method for lateral-migration-preventing production of wall surfaces made of cement-based materials and sealed against water, more particularly of walls, of structures made of reinforced concrete, comprising: erecting an outer shuttering, applying a sealing material preferably to the full area of the inside of the outer shuttering, arranging a reinforcement in front of the inside of the outer shuttering that has been provided with the sealing material, applying an adhesion promoter to the sealing material through the reinforcement, erecting an inner shuttering, filling a cement-based material into the shuttering cavity formed by the outer and the inner shuttering, and hardening the material to form a solid bond between the cement-based material and the adhesion promoter located on the sealing material, a method for lateral-migration-preventing production of floor surfaces or surfaces made of cement-based materials and sealed against water, more particularly of floors and overhead surfaces of structures made

Abstract: An acoustic system is disclosed. The acoustic system includes a sound absorptive substrate, and a rigid polyester shell configured to be positioned over the sound absorptive substrate. The rigid polyester shell is configured to be mounted on an interior surface of a building such that at least some sound waves pass through the rigid polyester shell. The shell is configured to provide aesthetic features to the acoustic system.

Abstract: The present invention provided a precast modular concrete wall panel having a rectangular wall body with an upper slot and two side slots, and the wall body can further include an insulating layer and a decorative layer, and can contain a sandwich layer embedded in the concrete structure. The wall panels may be used with wall columns, wall corners and other components to form a wall panel system and further to form a building of frame structure or frame-share wall structure. Such wall panels have advantageous structural features and thus can be cost effectively prefabricated, and the construction process using such panel system can be performed with high efficiency.

Abstract: Disclosed is a method for manufacturing a soundproofing board part having improved sound absorption performance. The soundproofing board part is manufactured by using, as a material, a recycled soundproofing material which contains a polyurethane foam having excellent sound absorption performance and impact resilience during the press molding; and by producing a sound absorption part on the back surface of the soundproofing board part through a remolding processing method. Also disclosed is a soundproofing board part manufactured by the method. Accordingly, sound absorption performance of the soundproofing board part is improved by about 20% or greater, manufacturing cost thereof may be reduced by recycled resources utilizing waste sheets, and manufacturing process may be simplified compared the related art.

Abstract: The present invention discloses a high-sound-absorption composite material for a traffic sound barrier. The surface of a porous sound-absorption material layer is clad with a cladding layer in a sealing way, and the clad parts and joints are in sealed connection. The cladding layer is an expanded polytetrafluoroethylene microporous membrane or a modified membrane of the expanded polytetrafluoroethylene microporous membrane. A preparation method is disclosed, comprising the following steps of cutting the porous sound-absorption material; covering the surface of the porous sound-absorption material with the expanded polytetrafluoroethylene microporous membrane or the modified membrane of the expanded polytetrafluoroethylene microporous membrane; performing sealed connection on the clad parts and joints.

Abstract: A room divider (100) for dividing a room into two sub-portions (R1, R2) and for attenuating sound (S1, S2) travelling between the two sub-portions is provided. The room divider comprises hollow cylindrical elements (110) arranged periodically for dividing the room into the two sub-portions. At least some of the hollow cylindrical elements have a cylindrical shell (111) with at least one slit (112) extending in an axial direction (120) of the shell. The shell extends continuously along the perimeter of the corresponding hollow cylindrical element from one side (113) of the at least one slit to another side (114) of the at least one slit. Each of the at least one slit faces in a local elongation direction (130) of the room divider for increasing acoustic symmetry with respect to the two sub-portions. The use of destructive interference and resonance to attenuate sound allows for a less bulky/heavy acoustically absorbing room divider.

Abstract: Described herein is a laminate acoustic panel comprising a first layer and a second layer, as well as a ceiling system that includes the laminate acoustic panel.

Abstract: Component for a motor vehicle and associated motor vehicle. The component according to the invention has a first support layer (20) and a second support layer (22), partially applied on the first layer (20). The second layer (22) includes at least one first region (24A, 24B) applied on the first layer (20) and at least one second region (26A, 26B) positioned across from and separated from the first layer (20), the second region (26A, 26B) together with the first layer (20) delimiting an intermediated space (34A, 34B). The second region (26A, 26B) has a density lower than the density of the first region (24A, 24B). The second layer (22) comprises at least one third region (28A) applied on the first layer (20), the third region (28A) having a density lower than the density of the first region (24A, 24B).

Abstract: Described embodiments relate to a method of manufacturing a sound absorption material. The method comprises: forming a low density fibrous web to act as porous bulk absorber, the fibrous web containing a proportion of bi-components fibers, each bi-component fiber having a core material and a sheath material around the core material; applying a thin facing later to the low density fibrous web, wherein the facing layer is adhesively compatible with the sheath material; heating the fibrous web to a temperature sufficient to soften the sheath material of at least some of the bi-component fibers; and pressing the facing layer and fibrous web together under low pressure such that at least part of the facing layer contacts the softened sheath material of at least some of the bi-component fibers to form an adhesive bond between the facing layer and the fibrous web.

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 coating composition has a natural fiber-bearing dry matter mixture, as well as cellular plastic grains, mixed into water. By spreading this composition onto any base, particularly by spraying, and by hardening it, particularly through drying, the coating is formed from the coating composition, which coating provides extremely good acoustic properties. If a special fiber base plate based on chemical pulp is used as the base of the coating, the plate-like acoustic element is obtained.

Abstract: A motorsports helmet having an isolation mount defining a receptacle is provided. An adjustment plate is selectively disposed within the receptacle at different depths and includes an ear-cup. The ear-cup is secured relative to the adjustment plate and includes at least two degrees of freedom of movement.

Abstract: A sound absorber includes a duct member constituting a resonance pathway, the duct member including a pathway portion communicating ends of the duct member; a base member including a concave portion; and a cover member including a neck in which to insert the duct member. The cover member covers the concave portion of the base member, and the cover member combined with the base member forms a resonance space having a volume V The resonance pathway has dimensions of a length LH and a cross-sectional area SH and communicates the resonance space and an exterior of the sound absorber. The sound absorber has a resonance frequency fH determined by fH=(c/2?)·(SH/V·LH)1/2 and absorbs sound having the resonance frequency fH, where c represents sound velocity.

Abstract: In one embodiment, provided is an actively tunable acoustic attenuator having a frame, a membrane within the frame, and a mass secured to the membrane. In another embodiment, provided is an actively tunable acoustic attenuator having a frame, a membrane within the frame, and a mass secured to the membrane. The membrane is coupled, either indirectly or directly, to the frame via a variable stiffness coupler. In another embodiment, provided is an actively tunable acoustic attenuator having a frame and a plurality of membrane layers within the frame. An active material is between at least two of the plurality of membrane layers. A mass is secured to at least one of the plurality of membrane layers.

Abstract: Disclosed is a highly heat resistant sound absorbing material for a vehicle capable of maintaining a shape even at high temperatures of about 200° C. or above and which satisfies UL 94V-0 flame retardancy. More particularly, the a highly heat resistant sound absorbing material includes a fiber material having a limiting oxygen index (LOI) of at least about 25% and capable of maintaining a shape at a temperature of about 200° C. or above, and a thermosetting binder resin capable of maintaining a shape at a temperature of about 200° C., wherein the fiber material and thermosetting binder resin are provided at a specific proportion.

Abstract: The present disclosure is related to a method for producing a cellular panel which includes a cellular structure sandwiched between first and second stiff skins. The method includes the following steps: preparing at least two blocks of cellular material; disposing the two blocks on a base ply of dry fabric, while maintaining a space between the two blocks; folding the base ply around the two blocks so as to envelop the two blocks; filling in the space with a reinforcing ply; covering the base ply with a covering ply, on a side where the reinforcing ply has been introduced; injecting resin to an assembly obtained in the previous step; and curing the assembly.

Abstract: A method for handling a hydro sound absorber in the region of an offshore construction site. The method includes, prior to beginning noise-emitting work, positioning a hydro sound absorber in the region of the offshore construction site. The method includes positioning a transport housing receiving the hydro sound absorber close to at least one of a seabed or a surface of the water. The method also includes spreading out the hydro sound absorber from a first functional position out of the transport housing at least one of vertically to the extent of the offshore construction site or horizontally to the geometry of the seabed.

Abstract: A method of and system for installing a foundation element, in particular a (mono)pile, in a hard underwater ground formation uses a driver. The method comprises the steps of placing a foundation element on the underwater ground formation, placing a screen for reducing noise input from the driver, driving the foundation element into the ground formation by means of the driver while the screen is positioned about the foundation element, and attenuating noise transfer from the underwater ground formation to the outer wall of the screen during at least part of the driving.

Abstract: A device and method for a baffling, sealing, or reinforcement that includes one or more flow channel structures selectively formed in a carrier for achieving improved connection between the carrier and an expandable material attached thereto.

Abstract: A sound absorbing and sound blocking reinforced board for a vehicle is provided, which has advantages of simultaneously satisfying sound absorbing properties. The sound absorbing and sound blocking reinforced board is capable of reducing environmental pollutants and improving economic efficiency by including a sound absorbing layer, which includes a recycled polyurethane foam, a binding material, a web forming material, and a rigid reinforcement material; and a sound blocking layer.

Abstract: The invention relates to a noise reduction device (1) for arrangement on a traffic route, comprising at least one wall element (8) having a wall element longitudinal extension (28a), the wall element (8) being disposed on at least one base element (7) having a base element longitudinal extension (12) in the direction of the wall element longitudinal extension (28a), and the base element (7) has a first front face (14) and a second front face (15), and the two front faces (14, 15) extend opposite one another along the base element longitudinal extension (12). The first front face (14) of the base element (7) is provided with a curvature (16) and the second front face (15) of the base element (7) is provided with a second curvature (17) and the two curvatures (16, 17) extend in the direction perpendicular to the base element longitudinal extension (12).

Abstract: A system of panels for use in assembling a radiation, microbial, acoustically, and ballistically shielded space within a building or other personal space. The panels are comprised of an ionizing radiation shielding material layer, a non-ionizing radiation shielding layer, an anti-microbial treated layer, a bulletproof layer, and an acoustical shielding layer. A method is provided for using said panels to create a radiation, microbial, acoustically, and ballistically shielded space.

Abstract: A noise structure having a barrier made of a generally sound redirecting material defining a surface of the barrier, and a plurality of sound absorbing boxes connected to this surface, each box comprising a rear wall and an extensively perforated front wall, the walls defining a longitudinal channel at least partially occupied by a filling made of a sound absorbing material, in which the rear wall is a substantially flat plane wall assembled parallel to and spaced apart from the surface of the barrier and is in its turn extensively perforated.

Abstract: An electric heater (40) for integration into an acoustic panel (20) having sound-penetrating pores (30) communicating with a sound-canceling medium. The heater (40) includes an electrically conductive layer (53) with resistance-setting apertures (63) filled with sealant (73). Openings (83), which contribute to the sound-penetrating pores (30), extend through the sealant-filled apertures (63). The acoustic panel (20) can be assimilated into an aircraft component, such as a nacelle inlet lip, which requires both noise-reducing and ice-protecting features.