Abstract: A computing system may include an initial design space engine and an active region adaptation engine. The initial design space engine may be configured to identify a design domain for which to optimize a topology based on an objective function and determine an active region. The active region adaptation engine may be configured to iteratively adapt the active region until an optimization ending criterion is satisfied. Iterative adaptation of the active region may include expanding the design domain to include branch design elements, performing finite element analysis (FEA) on the expanded design domain, and determining an adapted active region by activating some of the branch design elements based on an active sensitivity threshold and deactivating some of the active design element based on design variable value changes.

Abstract: A speaker box includes a housing and a speaker unit accommodated in the housing. The speaker unit includes a diaphragm configured to vibrate and sound. The diaphragm is spaced from the housing to form a front sound cavity therebetween. The speaker box further includes a sound transmitting channel communicating the front sound cavity with outside. The front sound cavity and the sound transmitting channel cooperatively form a front cavity of the speaker box. A sound absorption layer is disposed at a portion of the housing facing the front cavity. The sound absorption layer includes a micro-porous structure. When the sound wave passes through the front cavity, the sound absorption layer is capable of absorbing the resonance vibration of the front cavity in high frequency, thus suppressing the amplification of the sound distortion due to the resonance vibration of the front cavity and improving the acoustic performance of the speaker box.

Abstract: The invention relates to a method for producing an absorbing sound insulation motor vehicle trim element having a four-layered structure made from a first foam layer, a second foam layer, a non-woven foam layer and a non-woven fabric layer. The invention further relates to an absorbing sound insulation motor vehicle trim element.

Abstract: A sound absorbing structure includes a wall having a first side and a second side and at least one acoustic scatterer coupled to a first side of the wall. The first side of the wall may be positioned to face a source of noise, such as moving motor vehicles, airplanes, and the like. The at least one acoustic scatterer has an opening and at least one channel. The at least one channel has a channel open end and a channel terminal end with the channel open end being in fluid communication with the opening.

Abstract: Sound attenuation panel for aircraft having a combination of acoustic attenuation properties. The acoustic panel includes an acoustic structure having a cellular structure and a resistive skin and a backing skin, the acoustic panel also including at least one auxiliary acoustic device with cavities that is configured to produce additional acoustic absorption, the auxiliary acoustic device with cavities being attached to the acoustic structure and including adjacent chambers or cavities separated by shared walls, each of the chambers or cavities having perforations and being adapted to produce acoustic absorption. The combination of the acoustic structure and the auxiliary acoustic device with cavities enables combination of the acoustic absorption properties of these two types of element and an increased range of frequencies of the noise that can be attenuated by the acoustic panel without increasing its overall size.

Abstract: The invention relates to a sound-absorbing construction component, which is suitable inter alia for use outdoors. The construction element comprises a sound-absorbing absorber layer having a sound entry surface and a plurality of extinguishing profiles fully enclosed in the absorber layer and arranged at a distance from one another. The extinguishing profile consists of a sound-reflecting material and has a profile inner space, which has one open side facing away from the sound entry surface. The extinguishing profile preferably comprises at least one inlet surface having numerous sound inlet openings and at least one closed reflection surface connecting to the inlet surface, wherein the reflection surface and the open side of the extinguishing profile are at a greater distance from the sound entry surface than the inlet surface. The profile inner space is hollow or completely or partially filled with the material of the absorber layer.

Abstract: A sound absorbing body includes a cup-shaped main body and a porous sheet. The cup-shaped main body includes an opening portion and a bottom portion. The porous sheet covers the opening portion. The main body includes, between the opening portion and the bottom portion, at least one hole that is larger than pores of the porous sheet and extends through the main body.

Abstract: Disclosed is an acoustic liner for a gas turbine engine, having: a face sheet; a first plurality of resonator chamber cavities, distributed non-uniformly against the face sheet, the first plurality of resonator chamber cavities defining a first aggregated volume that is configured to target noise attenuation at a first frequency, the first plurality of resonator chamber cavities include first and second resonator chamber cavities fluidly coupled to each other, which have different configurations with respect to each other; and a second plurality of resonator chamber cavities, distributed non-uniformly against the face sheet, the second plurality of resonator chamber cavities define a second aggregated volume that differs from the first aggregated volume and is configured to target noise attenuation at a second frequency, the second plurality of resonator chamber cavities include third and fourth resonator chamber cavities fluidly coupled to each other, which have different configurations with respect to each

Abstract: An assembly is provided for an aircraft propulsion system. This assembly includes a first acoustic panel and a second acoustic panel. The first acoustic panel includes a first perforated skin, a first non-perforated skin and a first cellular core arranged between and connected to the first perforated skin and the first non-perforated skin. The first perforated skin is configured with a plurality of first perforations. A first of the first perforations has a first width. A second acoustic panel includes a second perforated skin, a second non-perforated skin and a second cellular core arranged between and connected to the second perforated skin and the second non-perforated skin. The second perforated skin is configured with a plurality of second perforations. A first of the second perforations has a second width that is smaller than the first width.

Abstract: A lighting module (10) is disclosed comprising a light mixing chamber (35) delimited by a back plate (40) opposed by a cover plate (20) and a sidewall arrangement (30) extending between the back plate (40) and the cover plate (20); and a light source (45) mounted on the back plate (40) and arranged to emit light into the light mixing chamber (35), wherein the cover plate (20) is transmissive for light emitted by the light source (45) and transmissive for sound waves, and wherein the back plate (40) comprises a plurality of through holes (41), each through hole (41) having a diameter in a range of 50 to 500 micrometers. Also disclosed are a lighting kit comprising a plurality of such lighting modules (10) and a lighting panel assembled from such a lighting kit.

Abstract: Systems and methods for vibration attenuation, and for investigating a subsurface volume of interest from a borehole. System embodiments may include a vibration attenuation system, comprising: at least one vibration attenuator configured to dynamically isolate a vibration source, the at least one vibration attenuator comprising metamaterial defining a plurality of cells; wherein at least one cell of the plurality of cells comprises a plurality of sub-cells azimuthally arrayed about an axis of alignment, and at least one sub-cell of the plurality is defined by a solid, the at least one sub-cell including a plurality of cell segments substantially oriented in alignment with a mapping geometry comprising an inversion of a canonical tangent circles mapping. The vibration source may comprise an acoustic source. The system may have an enclosure having the acoustic source and the at least one receiver disposed therein, with the at least one acoustic attenuator is positioned between.

Abstract: Provided is a multilayer thermal insulator and related method that use a non-woven core layer comprising non-meltable and flame-resistant polymeric fibers. One or more scrims are disposed on the opposing major surfaces of the non-woven core layer, and a peripheral edge of the one or more scrims is either edge sealed or capable of being edge sealed to substantially encapsulate the non-woven core layer within the one or more scrims. Optionally, a binder is provided on the scrims or non-woven core layer to facilitate edge sealing. The provided insulators are essentially dust-free and capable of passing stringent flammability standards.

Abstract: An acoustic panel includes a plurality of acoustic units. Each acoustic unit includes a subwavelength cell, an acoustic septum attached across the cell and an acoustic backing attached across the cell behind the acoustic septum. The acoustic units have uniform constructions with the exception of varying cross-sectional dimensions, and varying peak absorption frequencies based on the varying cross-sectional dimensions. In relation to the peak absorption frequency for each acoustic unit, the acoustic septum is a vibratory membrane and the acoustic backing is an anti-vibration back plate, and the acoustic unit is acoustic impedance matched, whereby the acoustic unit is configured to substantially non-propagatively absorb frontal acoustic excitation at the peak absorption frequency using the acoustic septum and the acoustic backing.

Abstract: An acoustic attenuation panel for a propulsion unit including a nacelle and a turbojet engine includes a cellular core disposed between an inner skin and an outer skin, called acoustic skin, the acoustic skin including a plurality of acoustic apertures, the acoustic apertures being inclined, at a non-zero inclination angle (?) relative to the direction normal to the acoustic skin, upstream with respect to the flow direction of the air or gas flow to which the panel is intended to be subjected under normal operating conditions, that is to say upstream of the propulsion unit when the panel is mounted in such a unit.

Abstract: The present disclosure pertains to a trim part for a motor vehicle that comprises: a carrier; and a decorative material applied onto an upper surface of the carrier, wherein the decorative material comprises a printed thermoplastic film; and wherein the trim part is shaped by a deep-drawing process and a grain or impression is produced on the visible side of the film, which faces away from the carrier, by the deep-drawing process. A method and a device for manufacturing the trim part is also proposed.

Abstract: An acoustic panel (1) includes a plate (2) made of an acoustic absorbing material (3), as well as a resistive skin (4) and a backing skin (6) arranged respectively on both sides of the plate (2), the acoustic panel (1) including acoustic elements (8) able to carry out an acoustic absorption, each of them being arranged in a housing (7) provided in the plate (2) with an opening (9) in front of the resistive skin (4). The combination of the plate (2) and the acoustic elements (8) allows to combine the sound attenuation properties of these two types of elements and to increase the frequency range of sounds that can be attenuated by the acoustic panel (1), without increasing the dimension.

Abstract: A method and apparatus for attenuating acoustic waves is provided. A lattice is formed with a plurality of support struts. A plurality of resonating struts are formed extending between the support struts, wherein the resonating struts are configured to attenuate acoustic waves within a predetermined range of frequencies while allowing acoustic waves outside the predetermined range of frequencies to pass through the resonant structure unattenuated. The resonant structure is interposed between two bodies to isolate one body from acoustic waves from the other body over the predetermined range of frequencies.

Abstract: An ultra-thin Schroeder diffuser comprises a backing-plate, wherein the backing-plate is provided with 7×p rows and 7×q columns of unit cells, p and q are integers greater than or equal to 1, a side length of the unit cell is 0.48?, a depth of the square unit cell is 0.04?, the unit cell is provided with a square neck, a side length of the square neck is less than the side length of the unit cell, a depth of the neck is 0.01?, ? is a wavelength of the diffuser corresponding to the design at a center frequency center f0, the neck widths w of different unit cells are different, and a distribution of the widths satisfies a certain sequence.

Abstract: The present disclosure provides acoustic structures and related systems and methods which may be used to dampen or attenuate sound waves, including, for example, noise generated by or emanating from various aspects or components of turbomachines such as turbine engines. These acoustic structures include oblique polyhedral cellular structures, including converging polyhedral cells and diverging polyhedral cells, and related systems and methods of making and using such acoustic structures.

Abstract: Systems and methods are provided for septa for acoustic cells. One embodiment is a method that includes fabricating a septum of a cell of an acoustic panel, by heating a material into a molten material, depositing the molten material to form a lower chamber of the septum that extends vertically upwards and includes an entry, iteratively depositing layers of the molten material, each layer comprising a filament at the entry that includes overhangs with respect to vertically adjacent layers, and forming openings at locations of the overhangs.

Abstract: An explosion proof assembly that includes a first portion with a window; an outer touchscreen coupled with the first portion to occlude the window; and a second portion releasably coupled to the first portion. The second portion has a second portion inner surface. The assembly includes a mobile device operable via a mobile device touchscreen. Upon assembly, the outer touchscreen is transmissive to the mobile device touchscreen. The explosion proof assembly has a sound material therein having a porosity of between about 10 microns to about 30 microns.

Abstract: A porous acoustic bead resonator is provided, wherein the Young's modulus of the material of the resonator is lower than 1 GPa and the porosity of the resonator is comprised between 20% and 50%, most of the pores of the resonator being filled with a gas and most of the pores being interconnected, via at least one pore, with the exterior of the resonator.

Abstract: Core structures for composite panels, aircraft including the same, and related methods. A core structure includes a core body defining a first body side, a second body side, and a plurality of core cells. Each core cell includes at least one cell wall and defines a tubular cell void. Each core cell includes a bulk region and a transition region. Each cell wall is flared within the transition region to increase a surface area of the first body side relative to an average transverse cross-sectional area of the core body. A composite panel includes a core structure with at least one laminate ply coupled to the first body side of a core body. A method of manufacturing a composite panel includes forming a core body via an additive manufacturing process and operatively attaching at least one laminate ply to the core body.

Abstract: An acoustic resonator according to the present invention includes a fluid accommodation part having a space portion configured to accommodate a fluid, and openings, closing portions configured to close the openings, and a compressibility reduction portion configured to vent the space portion to reduce effective compressibility of the fluid accommodation part.

Abstract: A sound absorbing material includes a fiber group of inorganic fibers, a fiber group of organic fibers, or a fiber group of a fiber blend including the inorganic and organic fibers. In the fiber group, at least junctions between the fibers are coated with a polymeric coating film having a loss factor of 0.1 or more.

Abstract: The invention relates to a thermal insulating element for thermally insulating an interior of a rail vehicle. The insulating element is characterized in that the insulating element has a length, a width, and a thickness, is at least partly made of a closed-cell material, and has at least one expansion joint on the insulating element outer surface. The invention further relates to a method for assembling a thermal insulating element on an interior surface of a rail vehicle, said method having the steps of providing a thermal insulating element which has a length, a width, and a thickness and which is at least partly made of a closed-cell material and attaching the insulating element to an interior-side surface of the rail vehicle.

Abstract: A soundproof structure includes two or more different kinds of resonant type sound absorbing cells, and an opening part. The opening part is disposed in a position in contact with both two resonant type sound absorbing cells of the two or more different kinds of resonant type sound absorbing cells, or the two resonant type sound absorbing cells are adjacent to each other, and the opening part is disposed in a position adjacent to at least one of the two resonant type sound absorbing cells. Resonance frequencies of one kind of first resonant type sound absorbing cells and resonance frequencies of the other kind of second resonant type sound absorbing cells different from the first resonant type sound absorbing cells match each other.

Abstract: An indicator device including a protective layer, an optically reflective layer, a polymeric material layer disposed between and coupling the protective layer to the optically reflective layer, and a dye disposed within the polymeric material layer, the dye being sensitive to external stimuli.

Abstract: In order to increase road noise transmission loss, a double-wall panel includes a core material. The core material is enclosed between an outer wall and an inner wall facing each other, and has at least a predetermined thickness across the panel in all in-plane directions of the walls. The core material has a specific surface area of 20,000 (mm2/cm3) or more, where the specific surface area is defined as a surface area per unit volume.

Abstract: Provided are a soundproof structure and an opening structure which is easy to be manufactured, has a light weight, and is capable of absorbing sound in a wide frequency bandwidth. The soundproof structure includes a tubular member and a film member arranged so as to block a hollow portion of the tubular member. Assuming that a wavelength corresponding to a resonance frequency in a single film vibration element of the film member is ?a, lengths from a position at which the film member is attached to two opened end surfaces of the tubular member are L1 and L2, an opened end correction length is ?, and n is an integer of 0 or more, at least one of (?a/4??a/8)+n×?a/2???L1?(?a/4+?a/8)+n×?a/2?? or (?a/4??a/8)+n×?a/2???L2?(?a/4+?a/8)+n×?a/2?? is satisfied.

Abstract: Provided are a sound-absorbing membrane, a sound-absorbing material, and methods of manufacture therefor that can provide suitable sound absorbing performance, suppressed deterioration in appearance quality, and easy production. A sound-absorbing membrane 10 includes: a base sheet 11 made of a nonwoven fabric having a airflow resistance of 0.01 to 0.1 kPa·s/m; and a resin film 12 covering one surface of the base sheet, the resin film 12 made of a thermosetting resin in a semi-cured state. Fillers 13 made of powder having an average particle diameter of 1 to 100 ?m are dispersed in the resin film 12. The sound-absorbing membrane 10 has a whole airflow resistance of 0.2 to 5.0 kPa·s/m.

Abstract: An acoustic liner can include a support layer with a set of partitioned cavities defining a set of cells with open faces, a first facing sheet operably coupled to the support layer such that the first facing sheet overlies and closes the open faces, and a set of internal separator structures within at least some of the set of partitioned cavities.

Abstract: An enhanced acoustic cell for use in acoustic panels is provided. The provided enhanced acoustic cell has a parabolic-shaped cell floor and a receiving object suspended at its focal point. Components of the enhanced acoustic cell may be easily replicated and installed into a face sheet comprising an array of a plurality of interconnected acoustic cells. The provided acoustic cell, and arrays thereof, may be produced using an additive manufacturing (AM) technology.

Abstract: An acoustic panel for attenuating sound, and a system and method for making the acoustic panel. The acoustic panel employs rounded particles which are introduced into the cells of a core and fixed at a particular depth to form a septum layer providing substantially linear acoustic resistance to sound waves entering the cell. The particles may be between 100 microns and 700 microns in diameter, may be solid or hollow, may have smooth or textured surfaces, and/or may be made of syntactic foam or glass or ceramic. The system includes a positioning mechanism for positioning the particles at the particular depth, metering and gating mechanisms for introducing a metered amount of the particles into each cell, and a vibratory base for vibrating the particles to better pack them. Once the particles are in the cells, the septum layer is fixed, and the positioning mechanism is removed.

Abstract: An acoustic air flow resistive article and a method of making same. The acoustic air flow resistive article can include melt blown fibers having a fiber diameter of no greater than 10 ?m and binder fibers dispersed amongst the melt blown fibers and at least partially melt-adhered to the melt blown fibers. The melt blown fibers can be formed of a resin having a first melting point, and the surface of the binder fibers can be at least partially formed of a resin having a second melting point that is less than the first melting point. The method can include mixing the melt blown fibers and the binder fibers to form a web, and pressing the web at a temperature that is less than the first melting point and greater than the second melting point.

Abstract: Disclosed are a sound absorbing fabric with improved thermal insulation, and a method of manufacturing the same, wherein an inorganic aerogel powder and a thermosetting binder resin are impregnated into a non-woven fabric made of a heat-resistant fiber, wherein the inorganic aerogel powder has a surface modified by a surfactant to be uniformly mixed with and dispersed in a binder resin, thereby forming the sufficient number of micro cavities inside the non-woven fabric and increasing dispersibility of the inorganic aerogel powder, and thus heat resistance, sound absorbing and sound insulating properties, and thermal insulation properties can be significantly improved.

Abstract: A sound isolation device includes an acoustic scatterer that has an acoustic monopole response and an acoustic dipole response. The acoustic dipole response and the acoustic monopole response of the acoustic scatterer may have substantially similar resonant frequencies. The device may include a plurality of acoustic scatters forming an array of equally spaced apart acoustic scatterers.

Abstract: A method is provided for forming a structural panel. During this method, a core structure is formed by shaping a first portion of a sheet of ribbon material to form a first baffle and a first septum. Thermoplastic material is then overmolded onto the ribbon material, between the first baffle and the first septum, to form a first set of walls.

Abstract: Aspects herein relate to a garment having zoned insulation features. The zoned insulation features comprise projections that extend in the z-direction with respect to the surface of a base material forming the garment such that the projections face toward a body surface of a wearer when the garment is worn. The number and/or size of the projections may vary over the garment depending on the amount of insulation needed in different areas of the garment.

Abstract: The present invention relates to a method for applying spot transverse forces to an intermediate material composed of a layer of unidirectional reinforcing fibers associated on at least one of its faces to a layer of thermoplastic and/or thermosetting material that does not represent more than 10% of the total weight of the intermediate material, wherein the spot transverse forces are applied while the intermediate material is under tension in the direction of the unidirectional reinforcing fibers.

Abstract: Acoustic structures in which acoustic septa are located in the angled cells of a honeycomb for reducing the noise generated from a source. The honeycomb used to form the acoustic structure has cell walls that extend at an angle relative to the honeycomb edges such that the depth of the honeycomb cells is greater than the honeycomb core thickness The acoustic septa are formed by inserting planar acoustic inserts into the angled honeycomb cells to form septum caps which are friction-locked within the angled cells and then permanently bonded in place.

Abstract: A soundproof cover is mounted to a first gear box of a power seat motor unit that is attached to a frame member of a seat and that has a motor and a gear box. In the first gear box, the axial direction of the motor is defined as the X direction, the direction of attachment to the frame member, which is one of two directions that are orthogonal to the X direction, is defined as the Y direction, and the remaining direction is defined as the Z direction. Then, the soundproof cover has: a foam disposed on at least an X-Z surface of the first gear box; a cover member disposed on the outer side of the foam; and a mass body interposed between the foam and the cover member and disposed at a position corresponding to at least the X-Z surface of the first gear box in contact with the foam.

Abstract: The present invention contemplates regularly spaced or variable width slats having equal width, but with heights determined by an inverted QR sequence, which converts focusing concave areas into beneficial, diffusing convex areas for improved diffusion, especially in the near field. The inverse sequence provides longer resonator necks, between adjacent slats, needed to provide a lower average resonant frequency. Slats are uniformly spaced with inverted QR slat heights have widths determined by the ground states of a Bernesconi sequence. Uniformly spaced, inverted QR slat heights have widths determined by the same QR sequence used to determine heights. Alternatively, uniformly spaced, inverted QR slat heights have widths determined by a Prime 7, primitive root sequence. The uniformly spaced slats have curvilinear forward facing surfaces with their heights based on either a regular or inverted QR sequence, as well as a primitive root or other number theory or optimized sequence.

Abstract: During a method for forming a structural panel, a core structure is formed that includes a plurality of corrugated ribbons and a plurality of walls. Each of the corrugated ribbons is laterally between a respective adjacent pair of the walls. Each of the corrugated ribbons includes a plurality of baffles and a plurality of porous septums. Each of the porous septums is longitudinally between a respective adjacent pair of the baffles. The forming of the core structure includes bonding a first of the walls to a first of the corrugated ribbons and subsequently bonding a second of the walls to the first of the corrugated ribbons. The core structure is bonded to a first skin. The core structure is bonded to a second skin. The core structure is vertically between the first skin and the second skin, and the first skin is configured with a plurality of perforations.

Abstract: A suspended ceiling system having adjacent superposed suspended rectangular panels displaying a three-dimensional structure formed of elements existing primarily at two closely spaced horizontal planes, the system including a rectangular grid of bolt slot style grid members dividing the ceiling area into rectangular modules, lower panels and upper panels paired with the lower panels at the grid modules, the lower panels being formed of sheet metal having material removed to form individual open areas separated by residual sheet material and to provide a total open area of at least 10%, the upper panels having a variegated surface appearance when viewed through the open areas of the lower panels.

Abstract: A windshield according to the present invention is a windshield to which an information acquisition device that emits and/or receives light to acquire information from an outside of a vehicle can be attached, and that includes a glass sheet, and a mask layer that is formed on the glass sheet and blocks a visual field from the outside of the vehicle, and at least one opening is formed in the mask layer. The glass sheet and the mask layer have different heat shrinkage percentages and are molded together by being heated. The information acquisition device is configured to be capable of using the information while reducing an influence of distortion that occurs in a predetermined range from an inner peripheral edge of the opening toward a center of the opening due to the molding.

Abstract: An acoustic liner and a method of attenuating noise are provided. The acoustic liner includes a face sheet, a back sheet spaced from the face sheet, and a core layer extending between the face sheet and the back sheet. The core layer includes a plurality of resonant cells, each resonant cell including at least one cell wall coupled to the back sheet along a cell wall base edge. The at least one cell wall extends from the back sheet at an angle toward the face sheet. The at least one cell wall further coupled to the face sheet along a cell wall top edge. The resonant cell is formed in a predetermined shape and contains a volume in a space defined by the at least one cell wall, the back sheet, and the face sheet. The cell wall base edge length is greater than the cell wall top edge length.

Abstract: An uncoupling mat includes an uncoupling layer; a layer of adhesive underlying the uncoupling layer, the adhesive layer having a subfloor-bonding surface; and an entangled filament sheet overlying the uncoupling layer, the entangled filament sheet being a resilient three-dimensional web of extruded polymer monofilaments, the polymer monofilaments being heat welded at junctions to form an open network of tangled monofilament.

Abstract: An acoustic treatment panel including a cellular structure core sandwiched between a solid skin and a perforated skin, and a plurality of domes made of porous fabric and extending from at least one of the skins into the insides of the cells of the cellular structure towards the other skin so as to define at least two resonant cavities inside each cell of the cellular structure.

Abstract: Acoustically treated components and methods of acoustic treating are provided. The acoustically treated components include a structural fitting having a first surface and a second surface, wherein the first surface defines a flow path and includes a plurality of perforations passing through the structural fitting from the first surface to the second surface, at least one non-structural acoustic treatment member installed on the second surface, a first end of the at least one non-structural acoustic treatment member attached to the second surface such that a cellular structure of the at least one non-structural acoustic treatment member aligns with the plurality of perforations, and a cover attached on a second end of the at least one non-structural acoustic treatment member such that an acoustic chamber is defined between the cover and the cellular structure and open to the flow path.