Abstract: An apparatus and method for providing isolation between components in microfabricated devices is provided. In one embodiment, a microfabricated device comprises: a base layer; a microfabricated component; and a non-sacrificial aerogel layer in contact with the microfabricated component and supporting the microfabricated thermal component on the base layer. The non-sacrificial aerogel layer is positioned to provide at least one of thermal, electrical or acoustic isolation between the microfabricated thermal component and the base layer.

Abstract: A stackable noise attenuating disk includes an inner perimeter edge and an outer perimeter edge. A plurality of inlet passages is disposed along the inner perimeter edge and a plurality of outlet passages is disposed along the outer perimeter edge. The plurality of outlet passages includes a plurality of first outlet passages and a plurality of second outlet passages. Each of the plurality of first outlet passages have a first width and each of the plurality of second outlet passages have a second width that is greater than the first width. Fluid entering the inlet passages passes through a plenum section of adjacent disks to exit through the first and second outlet passages. The first outlet passages and second outlet passages cooperate to disperse the noise peak frequencies of fluid exiting the plurality of outlet passages, thereby reducing the overall noise level of fluid exiting the plurality of outlet passages.

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: There is provided a piping installation structure for a vehicle which is installed under a floor of a vehicle body and configured to support and fix a long part including at least piping, the piping installation structure including: a clamp member for supporting and fixing the long part; a stud for fixing the clamp member under the floor of the vehicle body; a stud fixing member to which the stud is fixed; and an underfloor structural member installed under the floor of the vehicle body, in which the stud fixing member and the underfloor structural member are joined to form a closed cross section on a plane which is orthogonal to a front-rear direction of the vehicle body.

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: A method for fabricating an acoustic metamaterial may include providing a planar pattern of springs arranged in columns and rows and separated from each other by interconnection nodes, providing a planar pattern of mass units separated from each other by a distance corresponding to a distance between the interconnection nodes, providing an array of vertically oriented springs separated from each other by the distance between the interconnection nodes, and aligning and joining the planar pattern of springs, the planar pattern of mass units and the array of vertically oriented springs to form a layer of unit cells.

Abstract: The invention relates to a method for adapting a vibration isolation system as well as to an arrangement with a vibration isolation system. By constructive measures in the environment of the vibration isolation system, particularly plane-parallel surfaces areas are avoided and thereby disturbing environmental influences are reduced.

Abstract: A pneumatic tire with a noise damper made of a spongelike multi-cellular material is disclosed. The noise damper is divided into small dampers to improve the high-speed durability of the tire. The noise damper is provided with a water-impermeable outer coating to prevent water from infiltrating into the spongelike multi-cellular material during transporting, store keeping and the like.

Abstract: An acoustic waveguide with at least two portions coupled by vibration damping structure. The vibration damping structure may be a conformable material such as closed cell foam. The vibration damping structure may further include structure for inhibiting motion in a direction transverse to the interface between the vibration damping structure and a portion of the waveguide.

Abstract: Methods for vibration and acoustic abatement. The methods comprise providing a substrate with a composite layer deposited thereon, the substrate receiving a vibration energy sufficient to provide at least one bending wave therein, and converting at least a portion of the vibration energy sufficient to cause the at least one bending wave to at least one shear wave in at least a portion of the composite layer. The composite layer comprises an elastomeric polymer matrix comprising carbon nano tubes dispersed or distributed therein. Articles with the composite layer comprising carbon nano tubes disposed thereon are also disclosed and described.

Abstract: A method for fabricating an acoustic metamaterial may include providing a planar pattern of springs arranged in columns and rows and separated from each other by interconnection nodes, providing a planar pattern of mass units separated from each other by a distance corresponding to a distance between the interconnection nodes, providing an array of vertically oriented springs separated from each other by the distance between the interconnection nodes, and aligning and joining the planar pattern of springs, the planar pattern of mass units and the array of vertically oriented springs to form a layer of unit cells.

Abstract: Disclosed is a refrigerator having a noise reduction structure. According to the refrigerator, a branch pipe for reducing the intensive noise occurring from an impeller part is provided to a discharge pipe connected so that the refrigerant is discharged in a direction of a condenser from the impeller part. Therefore, the traveling sound wave of the noise traveling along the discharge pipe and the reverse sound wave traveling toward the branch pipe provided to the outer periphery of the discharge pipe meet each other, so that the both sound waves are cancelled to reduce the noise.

Abstract: A passive noise attenuation device and system is provided having a reticulated open-cell porous structure configured to acts as a passive control device in order to mitigate combustion noise and instability problems in combustion systems. A porous inert media structure is placed downstream of the reaction zone of a combustion chamber to dissipate noise and/or instability generated upstream in the flame. The porous inert media also limits and/or disintegrates vortical structures in the flame to produce a homogeneous flow field to facilitate distributed reaction zones.

Abstract: It is an object of the present invention to provide a solid-borne sound reducing structure which is able to reduce solid-borne sound with a simple configuration, highly durable, and being less degraded. There is provided a solid-borne sound reducing structure (100) in which a surface plate part (1) including a gas ventilating part (1a) which allows gas to pass through along a thickness direction is disposed by means of an outer peripheral wall part (2) on a structure (200) that radiates noise while vibrating, so as to at least partially cover a surface (200a) of the structure (200). The surface plate part (1) is supported by the outer peripheral wall part (2) so as to be integrally vibrated with the surface (200a) of the structure (200). In addition, the outer peripheral wall part (2) supports the surface plate part (1) in such a manner that an internal gas chamber is formed between the surface (200a) of the structure (200) and the surface plate part (1).

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: The present invention relates to a method for vibration damping and noise reduction by using thermoplastic vulcanizate compositions and to multilayer structures for use in vibration damping and noise reduction applications comprising at least one polymeric layer made of a thermoplastic vulcanizate composition.

Abstract: A method of manufacturing a multifunctional shielding mat for an interior of a vehicle is provided. The method includes providing at least one sheet of dampening material, coupling at least one sheet of electromagnetic shielding material to the at least one sheet of dampening material, and configuring the multifunctional shielding mat to cover a predetermined area of the vehicle.

Abstract: A device for damping of vibrations for an item of equipment comprising a structure to which a first element and a second fragile element having to be protected from the vibrations are coupled. The device comprises first piezoelectric transducer means inserted between the structure and the first element and charged with converting energy of vibration of the structure into electric energy, at least one sensor coupled to the structure and arranged to deliver measurement signals representative of vibrations, control means electrically supplied by the electric energy generated and charged with deducing at least one amplitude of movement to compensate at least partially for the vibration, and to deliver control signals representative of each determined amplitude, and second piezoelectric transducer means inserted between the structure and the second element and charged with converting the control signals into movement to damp at least partially for the second element the vibrations.

Abstract: The present invention has a guide preventing radial vibration of a high-pressure pump sprocket engaged with a timing chain to transmit rotational power to from the timing chain to a high-pressure pump driving shaft and a guide formed on a timing chain cover to interact with the guide, in order to provide a noise reducing device for a timing chain of a diesel engine that can improve engagement between the high-pressure pump sprocket and the timing chain and effectively reduce operational noise generated in driving the timing chain, by appropriately supporting the high-pressure pump sprocket integrally rotatably fitted on the high-pressure pump driving shaft radially against the timing chain cover to prevent bending vibration of the high-pressure pump driving shaft.

Abstract: The disclosure provides a unit with a sound isolation/vibration isolation structure, an array employing the same, and a method for fabricating the same. The unit with a sound isolation/vibration isolation structure includes: a hollow frame surrounding an inside space; a film disposed within the inside space, vertically contacting an inside wall of the hollow frame; and a body mass disposed on a top surface of the film. Particularly, the horizontal area of the inside space is larger than the area of the top surface of the film.

Abstract: A sound absorbing structure is constituted of a housing having a hollow portion and an opening and a vibration member composed of a board or diaphragm. The vibration member is a square-shaped material having elasticity composed of a synthetic resin and is bonded to the opening of the housing, thus forming an air layer closed inside the sound absorbing structure by the housing and the vibration member. In the sound absorbing structure, when the lateral/longitudinal dimensions of the air layer and characteristics of the vibration member (e.g. a Young's modulus, thickness, and Poisson's ratio) are set such that the fundamental frequency of a vibration occurring in a bending system falls within 5% and 65% of the resonance frequency of a spring-mass system, a vibration mode having a large amplitude occurs in a frequency band lower than the resonance frequency of the spring-mass system, this improving the sound absorption coefficient.

Abstract: An acoustic waveguide with at least two portions coupled by vibration damping structure. The vibration damping structure may be a conformable material such as closed cell foam. The vibration damping structure may further include structure for inhibiting motion in a direction transverse to the interface between the vibration damping structure and a portion of the waveguide.

Abstract: A multilayer board for reducing solid-borne sound radiation with improved mechanical stability when subjected to a load, comprising a first cover layer, a second cover layer, and at least one core layer, wherein the at least one core layer is arranged between the first and the second cover layer, and wherein the at least one core layer comprises at least one first sloped slot.

Abstract: 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: The invention relates to a cladding part for components. The cladding part has at least two areas with different vibration damping properties. The different areas make it possible in a simple manner to meet partly conflicting requirements for cladding parts of the components in an optimum manner. The components include medical examination devices.

Abstract: Provided is a structure for reducing an acoustic load. The structure includes a tape structure. The tape structure includes an attachment part configured to be attached to a substrate, and an off-position part spaced apart from the substrate and having at least one ventilation hole. Therefore, owing to the resilience of the attachment part and shock-absorbing ability of an air layer formed between the off-position part and the substrate, an acoustic load can be reduced. In addition, since air can flow through the ventilation hole, the attachment part of the tape structure may be not separated by variations of air pressure.

Abstract: A damper has ridges and furrows thereon and a through hole therein. The damper includes a carbon nanotube film structure and an amorphous carbon structure. The carbon nanotube film structure defines a number of micropores therein. The amorphous carbon structure is composited with the carbon nanotube structure. The amorphous carbon structure comprises a number of amorphous carbon particles received in the micropores.

Abstract: A glazing unit with improved vibro-acoustic damping properties, including at least one glass sheet and at least one vibro-acoustic damping strip fastened onto at least one of faces of the glass sheet and that includes at least one element made of damping material having a loss factor of at least 0.4 and a Young's modulus of less than 200 MPa at 20° C. for frequencies below 5000 Hz. The strip also includes at least one weighting element that has a linear mass of greater than 0.05 kg/m and is fastened onto the element made of damping material, the element made of damping material being inserted between the glass sheet and the weighting element, and no device other than the glazing unit being joined to the strip.

Abstract: A chromate-free resin composite damping material is provided having a multilayer structure. The material can include an viscoelastic resin composition provided between two metal plates as an intermediate layer, where the viscoelastic resin composition can include a thermosetting resin further including an amorphous copolymerizable polyester resin and a curing agent. A surfaces of each metal plate contacting the resin composition can be provided with a chromate-free adhesion boundary film which includes between about 5 and 50 mass % of silica, between about 5 and 50 mass % of a polyester resin, between about 1 and 50 mass % of tannic acid, and between about 0 and 30 mass % of a silane coupling agent. Such damping material can provide excellent durable adhesion properties.

Abstract: A glazing unit with an improved vibroacoustic damping property including at least one sheet of glass and at least one vibroacoustic damping strip that is attached to at least one of the faces of the glass sheet and that includes at least one component made of damping material having a loss factor greater than 0.2. The strip is not joined to any other device on the opposite side from the glass sheet and the component made of damping material has a Young's modulus greater than 800 MPa, at 20° C., for a particular frequency corresponding to the critical frequency of the glazing unit to within plus or minus 30%.

Abstract: A damper includes at least one matrix and at least one carbon nanotube structure disposed on at least one surface of the at least one matrix. A loudspeaker using the damper is also disclosed. The loudspeaker includes a frame, a diaphragm secured on the frame, a bobbin having a voice coil, and a damper. The bobbin is secured to the diaphragm. The damper has a first engaging surface engaged with the frame and a second engaging surface engaged with the bobbin.

Abstract: A damper includes a paper matrix and a plurality of carbon nanotubes dispersed in the paper matrix. A loudspeaker includes a magnetic circuit, a bobbin, a voice coil, a damper, and a diaphragm. The magnetic circuit defines a magnetic gap. The bobbin is located in the magnetic gap. The voice coil is wounded on the bobbin. The damper is fixed to the bobbin and includes a paper matrix and a plurality of carbon nanotubes dispersed in the paper matrix. The diaphragm includes an inner rim fixed to the bobbin and mechanically held by the damper.

Abstract: A helicopter having a rotor, a fuselage connected to the rotor by connecting means, and a control device for controlling vibration of the fuselage; the control device including generating means for generating signals associated with vibration of the fuselage, and actuating means for producing a force on the fuselage associated with the signals to reduce vibration; and the actuating means being carried by the connecting means.

Abstract: An active noise control apparatus and an active noise control system for reducing noise using an active vibrator, such that edges ? of the vibrator (i.e. genesis locations of a bending moment of force caused by the vibrator) agree with positions ? on a distribution of the bending moment of force caused by noise vibration of a panel, and such that the edges ? of the vibrator are aligned with the positions ? on the panel where a sign, of the distribution of the bending moment of force over the panel caused by the noise vibration, reverses. As a result, a control vibration approximate to the noise vibration can be excited. Accordingly, when the vibrator is fixed by agreeing the edges ? of the vibrator with the positions ? determined by noise frequency desired to be reduced, noise due to a target noise frequency can be effectively reduced.

Abstract: A quiet motorized roller shade assembly has a roller tube for reeling and unreeling a reelable shade and an internal electric motor. The motor turns a drive wheel that mates with a the interior of the roller tube so that the roller tube rotates in response to the rotation of the drive wheel. The electric motor disposed within a motor sleeve for reducing sound transmission within the roller tube. A crown is disposed on one end of the roller tube. The drive wheel and the crown maintain a space between the electric motor and the roller tube so that the motor does not directly contact the roller tube. An idler assembly is disposed proximate the end of the roller tube opposite the crown. The idler assembly includes a spring member for reducing vibration between roller shade assembly and the mounting bracket during operation of the electric motor.

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

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

Abstract: A beam 14 having, at one end, a tie-point 11 screwed to reference location 12 of vibrating panel 15. At the other end of beam 14 is rubbing-point 13. Rubbing-point 13 is pushed into contact with panel 15 at contact location 17 by the flexibility of beam 14. Direct rubbing occurs between 13 and 17 during vibration. But a friction linkage 18 (FIG. 1B) can be mounted between beam point 13 and panel location 17 to redirect rubbing direction and/or to amplify friction movement. Vibration of panel 15 will cause slippage (rubbing) between point 13 and location 17, therefore creating friction dissipation of vibration energy. Construction of beam 14 can be complex to include more rubbing-points (FIG. 2, 3, 4) or more rubbing pieces (FIG. 1A, 1C) that can rub with each other to create more friction dissipation.

Abstract: An apparatus for retaining a component that transfers solid-borne sound includes a solid-borne sound damper having at least one spacer made of brake lining material arranged in association with the component.

Abstract: A device for attenuating energy along a conduit, comprising a first member having an essentially semi-cylindrical outer surface and a first cavity extending substantially longitudinally from end to end. A second member having an essentially semi-cylindrical outer surface is provided, with the outer radii of the first and second members being the same. The second member also has a longitudinally extending cavity. When the two members are secured to one another to form the device, the two cavities face one another to form a bore that extends from end to end and has respective opposed tapered portions having a circular cross-sectional configuration that decreases in diameter inwardly. The bore also has a central, cylindrical portion disposed between the tapered portions and having an axial length that is no greater than one third of the overall axial length of the device.

Abstract: A rotary shaft having ends with a surface layer or raised portions made of a compressible, preferably elastic, material, the ends including the surface layer or raised portions being covered with relatively thin walled durable plastic tubing.

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: The present invention relates to a method for vibration damping and noise reduction by using thermoplastic vulcanizate compositions and to multilayer structures for use in vibration damping and noise reduction applications comprising at least one polymeric layer made of a thermoplastic vulcanizate composition.

Abstract: Methods and apparatus for reducing the impact of guided (or “tube”) waves in permanently installed seismic systems are provided. 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: Disclosed is a vibration damping sheet (1) comprising a viscoelastic layer (2) containing a hollow inorganic fine particle, and a constraining layer (3) arranged on the viscoelastic layer (2).

Abstract: An acoustic waveguide with at least two portions coupled by vibration damping structure. The vibration damping structure may be a conformable material such as closed cell foam. The vibration damping structure may further include structure for inhibiting motion in a direction transverse to the interface between the vibration damping structure and a portion of the waveguide.

Abstract: An acoustic equipment mat is formed by arranging plural grain pieces of inexpensive silica gel in a single layer. When the mat is disposed under an acoustic equipment, the grain pieces have their upper ends in point contact with a bottom or the like of the acoustic equipment and have their lower ends in point contact with the underlying floor or the like. Hence, the mat 1a is notably reduced in the area of contact with the acoustic equipment or the like, so as to reduce the reflection of vibrations. In addition, the mat 1a is capable of extremely quickly dissipating, in the atmosphere, the vibrations directly propagated to the upper-end side thereof and the vibrations indirectly propagated thereto as reflected by the lower-end side thereof.

Abstract: A resonant frequency adjustor for mounting onto an exhaust pipe of an exhaust system of a vehicle adjusts the resonant frequency(s) of the exhaust pipe to minimize or control vibration transmitted to the vehicle and/or to tune the sound emitted by the exhaust system. The resonant frequency adjustor includes a base mounted to the exhaust pipe, an isolator attached to the base, a stud attached to and extending from the isolator, and a mass located on the stud. A gross adjustment of the vibration of the exhaust pipe may be achieved by varying the location of the resonant frequency adjustor on the exhaust pipe. A fine adjustment of the vibration of the exhaust pipe may be accomplished by adjusting the position of the mass on the stud.

Abstract: A vibration damping device capable of maintaining high vibration damping effect, and a bucket for a construction machine. The vibration damping device has a laminated plate (20) having at least its inner region fixed in a noise-emitting base material (11), the inner region being a region (G) other then a region which becomes a loop in a vibration mode when the base material (11) is vibrated in a vibration mode with a predetermined frequency.

Abstract: A vibration-control platform that, in some embodiments, includes a bottom plate having three or more wells. The wells receive a plurality of vibration-control elements, which are used to isolate a supported object from vibrations. In some embodiments, the vibration-control elements are rubber balls. The presence of the wells facilitates placement of the vibration-control elements under a top platform or directly under an object, especially when the object is located in a tight space, such as in a component rack, or when the object has a non-uniform weight distribution.