Abstract: A methodology for designing structured metamaterials that can reflect, absorb and focus the propagation of both scalar acoustic and vector elastic waves is described. Three exemplary representative inventions based on the disclosed invention are described, illustrating i) compact ultra-wide broadband isolation, ii) sub-wavelength gaps and negative index propagation utilizing a single material platform, and iii) a fundamentally new method of producing multiple high frequency spectral gaps. Such metamaterial designs possess a wide range of potential applications, ranging from but not limited to, isolating an entity from external mechanical or acoustical vibrations, compact focusing lenses as well as cascaded high frequency filters for wave shaping and nonlinear wave propagation control.

Abstract: In a conventional hard material insulator, reproduced sound can be tuned with use of characteristics of the material; however, various types of acoustic materials have specific high frequency characteristics, and thus their acoustic effects lack versatility, require compatible audio devices, and change with environment, musical genre, etc. To address this, a wind-bell member (resonant member) is arranged in parallel with a main propagation path of vibration transferred from an audio device to an insulator. Accordingly, a vibration system of a wind-bell having a tone determined by many factors such as a fundamental tone, harmonic tones, lingering sound, and fluctuation assists (enhances) high frequency vibration propagated from the audio device. As a result, due to the above assist action that is different in principle from a conventional type, acoustic characteristics such as a sense of localization, resolution, and a sense of transparency and scale a sound image can be dramatically improved.

Abstract: Assemblies, methods and systems useful for reducing the noise and vibration characteristics associated with hollow spaces or cavities of vehicles by positioning damping foam material within and spanning the space between a first substrate surface and a second substrate surface. The damping foam material is comprised of a first region and a second region, wherein the first region has an E? value at ?10° C. that is lower than the E? value at ?10° C. of the second region and an E? value at 25° C. that is higher than the E? value at 25° C. of the second region; and the second region has a variable cross-sectional width.

Abstract: An acoustic structure that includes a septum having an acoustic opening which defines an open area that varies in response to changes in the velocity of noise-containing media passing through the acoustic opening. The septum includes a fixed portion and one or more movable flapper portions wherein the fixed portion and/or the flapper portion(s) include surfaces that define an acoustic opening through the septum. The acoustic opening has an open area which varies due to movement of the movable flapper(s) in response to changes in velocity of the noise-containing media that passes through the acoustic opening. The resulting septum has a relatively low non-linearity factor (NLF).

Abstract: An exhaust gas apparatus of an internal combustion engine is capable of suppressing the sound pressure level from being increased by the air column resonance in the tail pipe. The exhaust gas apparatus being provided with an exhaust gas pipe at the downstream side of an internal combustion engine in the exhaust gas direction of an exhaust gas flow, the exhaust gas pipe having an upstream opening end at one end portion thereof and connected with a sound deadening device at the upstream side in the exhaust gas direction of the exhaust gas flow, and a downstream opening end at the other end portion thereof for exhausting the exhaust gas flow to the atmosphere.

Abstract: An arrangement comprising a plurality of attenuators for attenuating acoustic waves, each attenuator of the plurality of attenuators comprising: a first body defining a cavity therein and at least one open aperture extending across a portion of the first body, the first body being configured to attenuate acoustic waves over a resonant frequency band.

Abstract: A membrane is disclosed. The membrane contains a first weight disposed at a center portion of the membrane, and a first hinge structure disposed away from the center portion of the membrane.

Abstract: One variation may include a method of making frictional surfaces for products having coulomb friction damping are provided. The method may include coating a metallic member with a coating including friction material. The metallic member may be pressure rolled to achieve a desired coating thickness and or the metallic member may be micro-waved to cure the coating.

Abstract: The oscillating tube (10) includes a first end (12), an opposed second end (16), and a fluid conduit (18) defined by the tube extending between the opposed ends (12, 16). A segmented damping coating (20) covers in intimate contact a covered or coated portion (22) of the tube (10) so that the coated portion (22) of the tube includes at least about ten percent of an axial length of the tube and an uncoated portion (34, 36) that is not covered by the segmented damping coating (22) includes greater than about ten percent of an axial length of the tube (10). The segmented damping coating (20) may include polymers, polytetrafluoroethylene, single composition polymers, ceramic fibers, polymer fibers, reinforced polymer fibers including a polytetrafluoroethylene, ceramics, including monolithic and matrix ceramics, thermoplastics, carbon/graphic materials, silicon materials, metal rings or clamps, and combinations thereof.

Abstract: Methods and apparatus for reducing the impact of guided (or “tube”) waves in permanently installed seismic systems. By utilizing passive acoustic absorbers, the impact of tube waves may be reduced, leading to improved performance of permanently installed seismic systems that are installed onto production tubing when the well is completed.

Abstract: A metal panel assembly that may be used in a number of different applications, particularly those that are concerned with improved stiffness and/or reduced vibration and noise. According to an exemplary embodiment, the metal panel assembly has a multi-layer or sandwich construction and includes a metal body layer, a sound damping adhesive layer, and a metal outer layer. The outer layer is bonded to the body layer via the adhesive layer and improves the stiffness and/or reduces vibrations in the metal panel assembly. The outer layer may include a number of contact sections that confront the body layer through the adhesive layer, as well as a number of raised sections that are spaced from the body layer and increase or otherwise improve the stiffness of the metal panel assembly. In one embodiment, the raised sections resemble channels and are generally arranged in a column-like pattern; in another embodiment, the raised sections resemble ribs and are generally arranged in a grid-like pattern.

Abstract: A vibration damped enclosure comprises side walls and a vibration damping plate structure which extends across the enclosure and is attached to internal surface portions of a first and a second side walls. The vibration damping plate structure (2) comprises a non-rigid layer (12) sandwiched between two rigid layers (13, 14), wherein each rigid layer between the first and second side walls (5, 6) comprises at least one cut (15, 16) through the rigid layer (13, 14) which makes the extension of each rigid layer between the first and second sidewalls (5, 6) discontinuous.

Abstract: A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the perforated screen and the attenuator body. When fluid flows through the modal attenuator, sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing fluid noise in the modal attenuator.

Abstract: Embodiments of a noise attenuation device comprise a plurality of stacked plates that form channels to reduce energy in a flow of working fluid that transits the noise attenuation device. In one embodiment, the stacked plates include plates having openings in different patterns. Orientation of the plates align the patterns in a housing to form the channels. In one example, the plates are disposed in a fluid coupling (e.g., a valve and/or flow regulator) that includes a throttling element. The plates are spaced apart from the throttling element, thereby permitting the working fluid to flow through all of the channels whether the throttling element is fully or partially open.

Abstract: An acoustic/vibrational energy absorption metamaterial includes at least one enclosed planar frame with an elastic membrane attached having one or more rigid plates are attached. The rigid plates have asymmetric shapes, with a substantially straight edge at the attachment to said elastic membrane, so that the rigid plate establishes a cell having a predetermined mass. Vibrational motions of the structure contain a number of resonant modes with tunable resonant frequencies.

Abstract: A bracket assembly for an audio system that includes a mounting bracket slidably connected to a sub-assembly for attaching first and second loudspeaker enclosures of an audio loudspeaker system. The sub-assembly includes a plurality of vibration isolators disposed between a lower mounting bracket and an upper mounting bracket. The mounting bracket is attached to a first loudspeaker enclosure and the upper mounting bracket is attached to a second enclosure. First and second arms on the mounting bracket are inserted into first and second tracks on the lower mounting bracket to slidably attach the sub-assembly to the mounting bracket.

Abstract: A bracket assembly for an audio system that includes a mounting bracket slidably connected to a sub-assembly for attaching first and second loudspeaker enclosures of an audio loudspeaker system. The sub-assembly includes a plurality of vibration isolators disposed between a lower mounting bracket and an upper mounting bracket. The mounting bracket is attached to a first loudspeaker enclosure and the upper mounting bracket is attached to a second enclosure. First and second arms on the mounting bracket are inserted into first and second tracks on the lower mounting bracket to slidably attach the sub-assembly to the mounting bracket.

Abstract: A method for attaching a protective structure to a feed beam of a rock drilling rig, and a protective structure for a rock drilling rig. The protective structure is at least partly arranged around the feed beam so that as the feed beam bends in a bending direction of its longitudinal axis and/or twists about its longitudinal axis in a twisting direction, the protective structure substantially maintains its original shape.

Abstract: A sound insulation floor structure comprises a floor backing member, a floor finishing layer, and an intermediate layer between the floor backing member and the floor finishing layer, the intermediate layer comprising a buffer member comprising a nonwoven structure. The nonwoven structure comprises a thermal adhesive fiber under moisture which is melt-bonded to a fiber of the nonwoven structure to fix the fibers. For example, the sound insulation floor structure may comprise, in sequence, a floor backing member 1, a buffer layer 2, an air layer 3, a hard layer 4, and a floor finishing layer 5. In the floor structure, a support member 6 is disposed between the buffer layer 2 and the hard layer 4. The support member may occupy 10 to 70% of a floor area. The sound insulation floor structure prevents subsidence of a floor member due to walking, achieves comfortableness to walk, and has improved floor impact sound insulation.

Abstract: A laminated acoustic building panel comprises a pair of plasterboard substrates which are bonded together by an adhesive layer, the panel having a dynamic Young's modulus of 0.1 to 5 GPa and a damping loss factor of 5-30% (?=0.05-0.3), and the ratio of the adhesive to the applied surface area of the substrates being 80-250 g/m2. The laminated panel is relatively soft in construction and hence sound waves caused by knocking or impact noise is surprisingly damped using considerably less adhesive than known panels. The use of soft substrates and less adhesive significantly reduces the weight of the panel. Furthermore, the use of less adhesive significantly reduces costs and makes production easier.

Abstract: A mounting apparatus includes a mounting bracket and a securing element. The mounting bracket is configured to mount an expansion card. The mounting bracket is mounted in a chassis. The securing element includes a positioning member mounted to the mounting bracket, a mounting member mounted in the positioning member, and an elastic member surrounding the mounting member. The positioning member includes a first stopping portion. The mounting member includes a contact portion and a threaded portion engaging the chassis. The elastic member is resiliently compressed between the first stopping portion and the contact portion. The elastic member is configured to bias the threaded portion away from the chassis.

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: A noise reduced compressor has a body, an energy dissipation element, and a structural element configured to retain the energy dissipation element relative to the body. A noise reducer for an HVAC system compressor has an energy dissipation element and a structural element connected to the energy dissipation element. A method of reducing compressor noise includes disposing an energy dissipation element between a body of the compressor and a structural element and compressing the energy dissipation element against between the body of the compressor using the structural element.

Abstract: An acoustic structure that includes a septum having an acoustic opening which defines an open area that varies in response to changes in the velocity of noise-containing media passing through the acoustic opening. The septum includes a fixed portion and one or more movable flapper portions wherein the fixed portion and/or the flapper portion(s) include surfaces that define an acoustic opening through the septum. The acoustic opening has an open area which varies due to movement of the movable flapper(s) in response to changes in velocity of the noise-containing media that passes through the acoustic opening. The resulting septum has a relatively low non-linearity factor (NLF).

Abstract: Assemblies, methods, and an apparatus for damping vibrational energy induced to a reinforced skin structure are disclosed. The reinforced skin structure includes an outer wall and at least one stringer coupled to the outer wall. The method includes providing a damping apparatus that includes a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of the stringer and an energy dissipation member configured to dissipate vibrational energy of the stringer. The stiffening member includes at least two elongated members that are spaced a distance apart and at least one truss member that extends obliquely between the at least two elongated members. The damping apparatus is attached to the at least one stringer. The damping apparatus may be configured to dampen vibration in the range of between about 200-600 Hz.

Abstract: The present disclosure relates to a speaker cabinet for electronic device, which is disposed in an electronic device and comprises a cabinet body, two first fixing structures, two dampers, and two second fixing structures. The damper is disposed on two side surfaces of the cabinet body through the two first fixing structures and fixed on the electronic device through the two second fixing structures for fixing the cabinet body in the electronic device. The cabinet speaker according to the present disclosure adopts only two fixing structures to fix the cabinet body to the electronic device. The damper is also used for mitigating the vibrations generated by the cabinet body. In addition, the two fixing structures are used for supporting the damper for avoiding inclination of the cabinet body towards an unpredictable direction and colliding the housing of the electronic device and its internal components.

Abstract: A crankcase of an internal combustion engine includes protruding portions formed on an outer surface of the crankcase which are constituted of a pair of left and right wall members, and a vibration isolating rubber is fitted between the wall members. The crankcase configured in this manner prevents the generation of sounds from a protruding portion of the crankcase and is light-weight.

Abstract: A door module of a vehicle door is provided. The door module comprising a carrier plate, a drive unit arranged on the carrier plate for driving a power-operated adjustment device of the door module, and a decoupling means arranged on the carrier plate for attenuating an acoustic excitation of the carrier plate in operation of the drive unit. The decoupling means is formed by at least one slot, which partly separates a portion carrying the drive unit from another portion of the carrier plate and extends around the drive unit or around a fastening point of the drive unit on the carrier plate in a circumferential direction, and at least one web, which connects the portion carrying the drive unit with the other portion of the carrier plate.

Abstract: An acoustic energy absorption metamaterial includes at least one enclosed planar frame with an elastic membrane attached having one or more rigid plates are attached. The rigid plates have asymmetric shapes, with a substantially straight edge at the attachment to said elastic membrane, so that the rigid plate establishes a cell having a predetermined mass. Vibrational motions of the structure contain a number of resonant modes with tunable resonant frequencies.

Abstract: A method of making a damper member includes forming a lattice network of a first material using an additive powder forming technique. The lattice network includes interconnected pores. A matrix of a second, different material is then deposited within the interconnected pores to form a damper member having an acoustic attenuation that is tuned to dampen a target vibrational mode.

Abstract: The present disclosure relates to a speaker cabinet for electronic device, which is disposed in an electronic device and comprises a cabinet body, two first fixing structures, two dampers, and two second fixing structures. The damper is disposed on two side surfaces of the cabinet body through the two first fixing structures and fixed on the electronic device through the two second fixing structures for fixing the cabinet body in the electronic device. The cabinet speaker according to the present disclosure adopts only two fixing structures to fix the cabinet body to the electronic device. The damper is also used for mitigating the vibrations generated by the cabinet body. In addition, the two fixing structures are used for supporting the damper for avoiding inclination of the cabinet body towards an unpredictable direction and colliding the housing of the electronic device and its internal components.

Abstract: A method for providing a shock penetration resistant apparatus may include providing an item of protective gear to be positioned proximate to an object to be protected, and disposing a shock penetration resistant material proximate to the item of protective gear to attenuate or redirect shock pulses away from the object to be protected. An apparatus is also provided that may include an item of protective gear and a shock penetration resistant material. The item of protective gear may be configured to be positioned proximate to an object to be protected. The shock penetration resistant material may be disposed proximate to the item of protective gear to attenuate or redirect shock pulses away from the object to be protected.

Abstract: In a conventional hard material insulator, reproduced sound can be tuned with use of characteristics of the material; however, various types of acoustic materials have specific high frequency characteristics, and thus their acoustic effects lack versatility, require compatible audio devices, and change with environment, musical genre, etc. To address this, a wind-bell member (resonant member) is arranged in parallel with a main propagation path of vibration transferred from an audio device to an insulator. Accordingly, a vibration system of a wind-bell having a tone determined by many factors such as a fundamental tone, harmonic tones, lingering sound, and fluctuation assists (enhances) high frequency vibration propagated from the audio device. As a result, due to the above assist action that is different in principle from a conventional type, acoustic characteristics such as a sense of localization, resolution, and a sense of transparency and scale a sound image can be dramatically improved.

Abstract: Provided are: a noise reduction device with an improved adhesion of objects formed of a porous material and with a reduced processing time; a method of manufacturing the noise reduction device; and a pneumatic tire including the noise reduction device. The noise reduction device of the present invention includes: objects formed of a porous material; a band member for attaching the objects to the inner surface of a tire at two positions spaced at substantially equal intervals in the tire circumferential direction; and locking members formed of a thermoplastic resin. The band member is formed of a thermoplastic resin. Each object is disposed at a predetermined position in the tire circumferential direction, between the band member and the corresponding locking members. The locking members are bonded to the band member through the objects by thermal fusion.

Abstract: A shielding device is provided with a shielding element, which can be used for the thermal and acoustic shielding of components in a combustion engine. The mounting of the shielding device is such that thermal, acoustic and vibration transmission from hot, loud and vibrating components in the engine compartment or underbody area to a vehicle body is isolated.

Abstract: A panel assembly for use in any number of different applications, including a variety of vehicle applications, that reduces noise or vibrations, provides thermal insulation, and/or improves structural integrity. According to an exemplary embodiment, the panel assembly includes a main panel made from a metal, one or more sound damping patches also made from a metal, and an adhesive layer that joins the patches to the main panel in a constrained layer construction. The sound damping patches may include one or more forming features, which are designed to improve the formability of the panel assembly without significantly impairing its sound damping characteristics. There are different types of forming features, including internal forming features (e.g., openings, holes, slits, slots, etc.) located within the interior of the patch and external forming features (e.g., projections, fingers, recesses, waveforms, etc.) located along the perimeter of the patch.

Abstract: An apparatus and method to attenuate vibration and acoustic noise are provided. One apparatus includes a first layer formed from a non-metal material having a predetermined level of resistance to deformation to define a frequency response based on a vibrating frequency. The non-metal material has a profile defined by at least one sinusoid. The apparatus also includes a second layer defining an absorption layer coupled to the first layer. The second layer adds a body of mass adjacent the first layer.

Abstract: An inflatable, noise attenuating panel or barrier, comprised of an inflatable air chamber coated with (wrapped in or attached thereto) an acoustic barrier material, with which to construct a variety of structures that benefit from a degree of soundproofing.

Abstract: Provided are a tire noise reduction device allowing rapid and reliable puncture-repair of a pneumatic tire provided with an annular sound absorbing member on the inner surface of a tread portion of the tire, and a pneumatic tire provided with the tire noise reduction device. The tire noise reduction device includes: the annular sound absorbing member made of a porous material; and a repair liquid permeable layer stacked on an outer peripheral surface of the sound absorbing member. The repair liquid permeable layer has many continuous pores and has a flow resistance lower than that of the porous material. The tire noise reduction device is mounted on the inner peripheral surface of a tread portion of the pneumatic tire.

Abstract: An improved vibration damping apparatus is provided for use with window structures, including windows used in vehicles, aircraft, and spacecraft. The vibration damping system includes at least two separate layers of solid material that are typically substantially clear at visible wavelengths, in which the two layers are spaced-apart by a predetermined distance to form a space or gap therebetween. This gap will be of a size and shape to enhance vibration damping when it is filled with a gaseous compound, such as air. The air-film vibration damping system created by the above structure can be applied to an external pane of a window structure, or to the interior pane of a window structure, or perhaps to both an exterior pane and an interior pane of the same window structure, if desired.

Abstract: Temperature stability at the temperatures prevailing in a motor and stability that is required over an entire temperature range are provided by an attenuating mass. This enables continuous use at temperatures of approximately 150° C. while providing ultrasonic attenuation at low temperatures.

Abstract: Damping material is installed on a structure by moving a material placement head over the structure, and using the head to place the material on the structure.

Abstract: A tire noise reduction device and a pneumatic tire, in which tire vibration can be reduced while durability is maintained and tire noise is reduced. The tire noise reduction device includes two main sound absorbing members for changing the cross-sectional area of a cavity of a tire in the circumferential direction of the tire and two assistant sound absorbing members disposed between the two main sound absorbing members. Each of the sound absorbing members is formed of a porous material. Each main sound absorbing member includes a first sound absorbing part and a second sound absorbing part, where the second sound absorbing part has a density lower than that of the first sound absorbing part. Each assistant sound absorbing member has a density higher than that of the second sound absorbing part and a thickness less than that of the main sound absorbing member.

Abstract: A methodology for designing structured metamaterials that can reflect, absorb and focus the propagation of both scalar acoustic and vector elastic waves is described. Three exemplary representative inventions based on the disclosed invention are described, illustrating i) compact ultra-wide broadband isolation, ii) sub-wavelength gaps and negative index propagation utilizing a single material platform, and iii) a fundamentally new method of producing multiple high frequency spectral gaps. Such metamaterial designs possess a wide range of potential applications, ranging from but not limited to, isolating an entity from external mechanical or acoustical vibrations, compact focusing lenses as well as cascaded high frequency filters for wave shaping and nonlinear wave propagation control.

Abstract: An apparatus separates a band of resin-impregnated fiber material into strips and disposes the strips between parallel pin rows of a pinmat to form a layer of strips. The apparatus includes a pinmat-following roller comprising a first roller mounted on a first central axle on which the first roller can rotate and slide transversely, a first circular rib surrounding the first roller and capable of fitting between adjacent pin rows of a pinmat, and a circular groove in the first roller for coupling with the band-separating roller. The apparatus further includes a band-separating roller comprising a second roller mounted on a second central axle on which the second roller can rotate and slide transversely, multiple radially projecting disks from the second roller for separating the band of resin-impregnated fiber, and a second circular rib surrounding the second roller capable of coupling with the circular groove of the pinmat-following roller.

Abstract: Provided are: a noise reduction device with an improved adhesion of a noise absorbing member formed of a porous material and with a reduced processing time; a method of manufacturing the noise reduction device; and a pneumatic tire including the noise reduction device. The noise reduction device of the present invention includes: a noise absorbing member formed of a porous material; a band member for attaching the noise absorbing member to the inner surface of a tire; and locking members formed of a thermoplastic resin. The band member is formed of a thermoplastic resin. The noise absorbing member is disposed between the band member and the locking members. The locking members are bonded to the band member through the noise absorbing member by thermal fusion.

Abstract: A noise and vibration mitigating mat having top and bottom surfaces comprises a first layer formed of recycled bound rubber product, the first layer having a contoured bottom surface and a generally flat top surface, a second layer on the top surface of the first layer, the second layer being formed of a fabric and a third layer on the second layer and being formed of recycled rubber product.

Abstract: A door module of a vehicle door is provided. The door module comprising a carrier plate, a drive unit arranged on the carrier plate for driving a power-operated adjustment device of the door module, and a decoupling means arranged on the carrier plate for attenuating an acoustic excitation of the carrier plate in operation of the drive unit. The decoupling means is formed by at least one slot, which partly separates a portion carrying the drive unit from another portion of the carrier plate and extends around the drive unit or around a fastening point of the drive unit on the carrier plate in a circumferential direction, and at least one web, which connects the portion carrying the drive unit with the other portion of the carrier plate.

Abstract: A panel mounting structure for a vehicle is provided having a substrate; a panel; and a separable sound reduction member disposed between the panel and the substrate and being configured to separate into at least two pieces that each remain in substantially fixed relation to a different one of the panel and the substrate, and having a material selected so that the impact of the pieces with each other causes relatively little sound. The material can be configured to separate to form the at least two pieces due to relative motion between the substrate and panel. In specific embodiments, the sound reduction member can be comprised of a sound reduction member, such as felt, or a sound reduction member layer and an adherent backing layer.

Abstract: The invention relates to a retainer device for retaining a reducing agent metering valve. The retainer device at least partially surrounds an interior space which is provided for holding the reducing agent metering valve. According to the invention, the retainer device has a sound dampening device which dampens sound vibrations emerging from the interior space.