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: 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: Disclosed is a chromate-free resin composite damping material having a multilayer structure wherein a viscoelastic resin composition is interposed, as an intermediate layer, between metal plates. This chromate-free resin composite damping material is characterized in that (i) the viscoelastic resin composition is a thermosetting resin composed of an amorphous copolymerized polyester resin and a curing agent, and in that (ii) a chromate-free adhesive foundation film composed of 5-50% by mass of silica, 5-50% by mass of a polyester resin, 1-50% by mass of tannic acid and 0-30% by mass of a silane coupling agent is arranged on a metal plate surface which is in contact with the viscoelastic resin composition. This chromate-free resin composite damping material is excellent in durable adhesion.

Abstract: An improved vibration damping system is provided for use with window structures. The window damping system employs both air-film damping technology and viscoelastic damping materials to increase mechanical and/or acoustic vibration damping in window structures.

Abstract: One embodiment of a product includes an insert for disposition in or on a component. The insert may have at least one contact surface that can experience relative frictional movement against an adjacent interior surface of the component. The at least one contact surface of the insert may comprise a nominal plane and surface features arranged in a nonstochastic pattern. The insert may also be constructed and arranged for disposition in or on the component to dampen sound when the component is vibrated.

Abstract: A sound absorbing element, in one example, includes a first wall area, a second wall area as well as a plurality of spring elements. In this arrangement, the first wall area and the second wall area are arranged so as to be spaced apart by a clear space. In one example, the plurality of spring elements are arranged in the clear space and connect the first wall area and the second wall area to each other. By pre-tensioning the plurality of spring elements to a state in which their spring constant approaches zero, significant decoupling between the first and the second wall areas may occur, with accompanying sound noise reduction.

Abstract: A noise attenuator for attaching a side wall panel to a frame that is exposed to vibratory loads and which includes a rigid core having a sleeve with two radially disposed end plates. A bracket encircles a portion of said sleeve between the end plates and is in non-contiguous relationship with the core. An elastomeric bushing is bonded to a portion of the bracket and the core with the exception of the outer faces of the end plates, which remain exposed. Voids are passed through the rear plate and extend axially between the bracket and the sleeve some length into the sleeve. Due to the geometry of the unit, the non-voided sections of the bushing are loaded in either a combination of tension and shear or compression and shear when the core is connected to a vibrating frame and the bracket is connected to a side wall panel.

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: An acoustic isolator for attenuating through-tool acoustic signals comprises a plurality of u-shaped link members, where each link member has two sets of ears. A plurality of yoke members are adapted to fit between cooperating sets of ears. A plurality of pins connect the plurality of u-shaped link members to the plurality of yoke members for providing limited flexural compliance. The isolator may be made from metallic and/or composite materials.

Abstract: An apparatus and method for reducing noise in a vehicle having a soft top roof. The apparatus includes a main extension bar having a first end and an opposing second end. A first coupling mechanism is affixed to the first end and a second coupling mechanism is affixed to the second end. The first and second coupling mechanisms are attached to roll bars located on a top portion of the vehicle. With the apparatus in place upon the roll bars, the main extension bar exerts upward force against the soft top roof of the vehicle, thereby reducing movement of the soft top roof and noise within the interior of the vehicle.

Abstract: Flow guides in the form of extensions that project internally from the housing of an electronic consumer device can contribute to undesirable noise emissions from the device. Proposed is an improved flow guide or extension that reduces propagation of flow induced vibrations to the housing, thereby improving the overall acoustic performance of the device.

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 spacer assembly adapted to prevent the formation of acoustical short circuits in a building ceiling, floor and/or wall assembly. The spacer assembly includes a support member and is adapted for spacing and supporting a finished interior building element in acoustic isolation with respect to a structural member.

Abstract: Respectively tapered and threaded pipe ends are rotated respective to each other to connect the pipe ends and progressively compress a yieldable damper sleeve therebetween as the pipes are rotated. NVH and torsional forces from one pipe end to another are suppressed.

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: 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: The invention discloses a damper including a damping portion, a first pillar-shaped portion, a second pillar-shaped portion and a first block portion. The damping portion has a first end and a second end. The first pillar-shaped portion protrudes from the first end of the damping portion, and the second pillar-shaped portion protrudes from the second end of the damping portion. The first pillar-shaped portion has a third end away from the first end of the damping portion, and the first block portion protrudes from the third end. In the invention, the damper can fix a speaker to a base directly without screws.

Abstract: The invention relates to a hydro sound damper, in particular for integration in an aircraft hydraulic system, with a throughout inner tube, wherein the inner tube comprises a perforation section which is coaxially encompassed by a housing under formation of a gas-filled cavity. The perforation section is coaxially encompassed by a metal felt cylinder at least in sections and an elastomeric membrane bears on the metal felt cylinder for generating a gas cushion, which is closed in itself. Due to the metal felt cylinder a pushing through of the elastomeric membrane into the bores of the perforation section is avoided when the hydraulic system is depressurized. Furthermore, the metal felt cylinder, which is infiltrated respectively flowed through, produces an improved damping characteristic which might moreover be adjusted by a variation of the flow resistance of the used metal felt.

Abstract: The invention discloses a dissipative vibration damping device (1), comprising a carrier (2) having an inner surface and an outer surface, the carrier being comprising on at least one surface thereof a bonding layer (3), wherein the carrier (2) is dissipative and has a damping loss factor of at least 0.2 and wherein the bonding layer (3) is made of a rigid material with higher stiffness than the carrier (2). Also disclosed is a system and a method using such dissipative damping device.

Abstract: The invention provides a vibration damping material excellent in vibration damping property and lightness, and in particular, a vibration damping material which can be preferably used for cars required to be light. In the vibration damping material of the invention, a foamed adhesive layer is integrally laminated onto one of the surfaces of a foamed thermoplastic resin sheet. Thus, vibration energy transmitted to the vibration damping material is smoothly absorbed by a synergetic effect of rigidity of the foamed thermoplastic resin sheet and viscoelasticity of the foamed adhesive layer, so that excellent vibration damping property is exhibited. Furthermore, the vibration damping material of the invention is excellent in lightness. Thus, the material can be preferably used for articles desired to be light, such as vehicles including cars and trains. The material is also excellent in a constructing property since the material is light.

Abstract: A sound suppression method includes using a passive noise suppression technology to destructively interfere with a sound wave propagating through a structure at portions of the structure that are positioned apart less than half of a wavelength of the sound wave.

Abstract: The present invention relates to an absorbent covering having high damping power, the covering being secured to a structure (20) and being provided with an absorbent layer (10) of elastic material (4). Remarkably, said absorbent layer (10) comprises a dissipater mesh arranged in the elastic material (4) and constituted by a plurality of nodes (2) and of dissipater elements (1), which dissipater elements are advantageously elliptical in shape.

Abstract: A tunable damper for a torque transferring assembly having a tubular shaft including an inner surface defining an elongated cavity includes an input channeling portion and an output channeling portion, wherein each channeling portion is formed from a first predetermined foam material having a first density and a diameter sufficient for providing a resilient bias force against the inner surface of the tubular shaft. The tunable damper further includes at least one absorber formed from a second predetermined foam material having a second density different from the first predetermined foam material and first density, respectively. The at least one absorber is positioned between the input and output channeling portions for attenuating a first predetermined range of frequencies of noise produced or transmitted by the torque transferring assembly.

Abstract: A system for closing a suction muffler of a hermetic compressor, the suction muffler including: a hollow base; a cover to be coupled to the hollow base, the parts defined by the hollow base and the cover including respective mutually seatable peripheral flanges, which are shaped to define, jointly, an internal channel extended along at least part of the circumferential extension of the peripheral flanges and which is opened to the opposite external faces of the latter by means of throughbores axially aligned to each other in pairs, each pair of throughbores maintaining a circumferential distance in relation to an adjacent pair of throughbores, the throughbores of each pair and the internal channel being filled with a gasket of injected material, which projects outwardly from the throughbores so as to define an axial lock portion.

Abstract: In a noise suppression structure of the present invention, a sound absorption sheet is pinched between a flange of a speaker grille and an interior trim. An opening of a space formed by the flange of the speaker grille and a sound guiding tube is covered with the sound absorption sheet.

Abstract: The present invention relates to a vibration signal processing method and system that can be used to account for situations where impact or impulse events are hidden in a normal vibration reading by low frequency vibrations and high frequency noise. In one preferred form, the method of the present invention comprises the steps of obtaining electrical vibration signals that represent mechanical vibrations of a machine (102-106), converting the electrical vibration signals into digital vibration samples (108), dividing the digital vibration samples into equal time intervals and determining the average absolute amplitude of the digital vibration samples for each time interval (110), generating a time waveform comprising the determined average amplitudes (112, 114), and processing the time waveform as if it were an independently-detected signal (116-120).

Abstract: An apparatus and method is provided for attenuating aerospace engine noise and unsteady pressure fluctuations associated with high velocity exhaust flows. The apparatus and method reduce acoustic fatigue damage to aerospace vehicles that may be caused by the reflection of exhaust energy from landing and/or launch platforms. The apparatus includes a passive treatment area associated with the platform operable for reducing the magnitude of the reflected sound waves and unsteady pressure fluctuations from the high velocity exhaust mass flow exiting from the engine. The passive treatment area may include a layer of sound absorptive material, at least one set of roughness elements for disrupting high velocity flow structures. A protective cover may be positioned over the passive treatment area for permitting exhaust flow to pass therethrough while still providing adequate structure to support the weight of the aerospace vehicle.

Abstract: An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.

Abstract: A material for use in building construction (partition, wall, ceiling, floor or door) that exhibits improved acoustical sound proofing and fracture characteristics optimized for efficient installation. The material comprises a laminated structure having as an integral part thereof one or more layers of viscoelastic material which also functions both as a glue and as an energy dissipating layer; and one or more constraining layers, such as gypsum or cement-based panel products modified for easy fracture. In one embodiment, standard paper-faced wallboard, typically gypsum, comprises the external surfaces of the laminated structure with the inner surface of said wallboard being bare with no paper or other material being placed thereon.

Abstract: A coupling device is interposed between an electronic or electro-acoustic component and a supporting structure for draining, transmitting and dissipating vibratory energy generated within the component, while isolating the component from vibratory energy emanating from the support structure, utilizing a ball rolling along a bearing surface in directions away from and toward an equilibrium position, with the ball biased toward the equilibrium position by magnetic attraction forces.

Abstract: The present invention is directed to a liquid composition for coating surfaces. The composition includes an absorbing agent that attenuates reflection of radiation having a wavelength in the visible and NIR ranges. The coating further includes an acrylic homopolymer or copolymer carrier vehicle and a solvent system.

Abstract: A motor vehicle gear shift assembly includes a dampening device and a detent structure. The dampening device includes a body structure made of a resilient material, a mounting structure for securing it to structure of the gear shift assembly, and a flexible dampening surface. The flexible dampening surface of the dampening device flexes to decelerate and stop the movement of the detent structure.

Abstract: An acoustic damping material for electro-optic material has an adhesive material combined with a ceramic crystalline material such that the acoustic impedance of the combined adhesive material and the ceramic crystalline material is substantially the same as the acoustic impedance of the electro-optic material.

Abstract: There is a noise reduction device for reducing noise from a vibrating strap. There is a securing member including a strip of material having a first surface including hook material and a second surface including loop material, wherein the securing member is configured to removably attach to the vibrating strap by wrapping about the strap and attaching a portion of the first surface to a portion of the second surface. There is a damping member including a plurality of strands of fibers configured to dampen vibratory motion. There is an internal coupling member configured to couple the securing member to the damping member and configured to bundle the plurality of strands of fibers.

Abstract: A sound-deadening louver is attached to vents that are formed in a wall structure. The louver is composed of a plurality of blades that are inclined at an angle to the surface of the wall structure. Each blade has a sound-deadening chamber therein, and an opening is formed on that side which faces each vent in the wall structure. First reflecting plates and second reflecting plates are mounted in the blade so as to extend from an edge portion of the opening into the sound-deadening chamber. The first reflecting plates have a curved shape, while the second reflecting plates have a flat shape.

Abstract: A damped structural panel is provided. The damped structural panel comprises a base layer, having a rear surface and a front surface; wherein a viscous fluid is applied on the rear surface of the base layer; and a rigid supporting layer is secured to the base layer over the viscous fluid.

Abstract: Disclosed is a method and apparatus for reducing vibrations in an electrical device, wherein the apparatus comprises a plurality of stacked metal plates, wherein the stacked metal plates move frictionally opposed to one another upon excitation of the device, and wherein movement of the stacked metal plates produces damping of the vibrations. The apparatus further comprises a clamp retaining the stacked metal plates, and a plurality of retaining mechanisms, wherein the clamp adjusts a force holding the stacked metal plates together, and wherein the clamp controls an amount of friction produced by the movement of the stacked metal plates. Also, the surfaces of the stacked metal plates comprise a machined surface finish, wherein the machined surface finish controls an amount of friction produced by the movement of the stacked metal plates. Moreover, the stacked metal plates are dimensioned and configured to control a frequency response of the vibrations.

Abstract: A vibration proofing heat shield plate fixed such as to cover at least a part of a heat source while forming a gap with respect to a surface of the heat source is provided with a vibration proofing heat shield plate main body portion, a collar member positioned at an open hole of the vibration proofing heat shield plate main body portion and provided with a pair of locking pieces fastened by bolt to the heat source, a washer member in which a portion interposed between a pair of locking pieces of the collar member is formed in an approximately C-shaped cross section, and a joint member joining the washer member and the vibration proofing heat shield plate main body.

Abstract: A squeeze film damper reduces acoustic wave transmission by the damping and spring forces produced by squeezing a very thin layer of air trapped between two vibrating plates. The damping effect is most pronounced when the gap between vibrating plates is very small, e.g., of the order of micrometers, thus, the squeeze film dampers have two, very closely-spaced opposing plates, the top of which vibrates out-of-phase with respect to the lower plate, when the lower plate is attached to a vibrating surface. The relative motion of plates squeezes out the thin film of air trapped within the plates and adds substantial amount of passive damping over a wideband of frequency to the base vibrating structure thereby reducing vibrations and noise radiated by the structure. The out-of-phase displacement of the top plate, with respect to the bottom plate, tends to cancel acoustic energy imparted to the lower plate by a vibrating surface. Squeeze film dampers can be applied in arrays to a vibrating surface.

Abstract: A refrigerator comprises: a body having a storage chamber and a mechanical chamber; a base plate arranged in the mechanical chamber without a direct contact with the body, and having a compressor; a first supporting member coupled to the body and supporting the body; and a second supporting member installed at a bottom of the base plate and supporting the base plate. A load of the body and a load of components inside the mechanical chamber are individually supported, so that vibration generated from the compressor, etc. is prevented from being transmitted to the body.

Abstract: Acoustic attenuation materials are described that comprise outer layers of a stiff material sandwiching a relatively soft elastic material therebetween, with means such as spheres, discs or wire mesh being provided within the elastic material for generating local mechanical resonances that function to absorb sound energy at tunable wavelengths.

Abstract: An easy to manufacture and install sound dampening pad for a printing blanket sleeve is provided. The pad effectively attenuates noise emanating from the sleeve during air pressurized mounting and dismounting of the blanket sleeve to an underlying cylinder. The sound dampening pad is fabricated from a flexible polymeric material and in one embodiment has a generally J-shaped configuration with inner and outer surfaces. At least a portion of the inner surface of the J-shaped configuration includes a pressure sensitive adhesive thereon to secure the pad to the inner surface of the sleeve.

Abstract: An acoustic attenuator includes a housing having an inner side surface which defines an interior chamber and at least one dampening member both physically and acoustically coupled to the housing and projecting into the interior chamber. Acoustic energy propagating within the housing is deflected into the dampening members for acoustically dispersal within the interior chamber. In various aspects thereof, the dampening members may include one or a group of two or more generally cylindrical sleeves having one end both physically and acoustically coupled to the housing and a second end projecting into the interior chamber. Preferably, when a group of two or more cylindrical sleeves are employed, the sleeves are nested within one another. The dampening members may further include a second, oppositely disposed, group of two or more acoustic attenuators nested within one another and interdigitated with the first group of cylindrical sleeves.

Abstract: An isolator is partially but substantially recessed in an acoustic floor and a leveling mechanism at least partially recessed in the acoustic floor is connected to the acoustic isolator to adjust the height of the acoustic floor when the floor is in place.

Abstract: A device is provided for dampening compressor-induced vibration in an air conditioning system of the type having an indoor unit, an outdoor unit and a refrigerant conduit therebetween. The outdoor unit includes a compressor that is operable to circulate a vapor compression refrigerant through the conduit between the indoor and outdoor units. The device is comprised of a support member containing a section of refrigerant line. The support member is located beneath the outdoor unit and the refrigerant line section is interposed in a portion of the refrigerant conduit between said compressor and said indoor unit, such that the refrigerant flowing between the indoor unit and the compressor is routed through the line section in the outdoor unit support member.

Abstract: A device is provided for dampening compressor-induced vibration in an air conditioning system of the type having an indoor unit, an outdoor unit and a refrigerant conduit therebetween. The outdoor unit includes a compressor that is operable to circulate a vapor compression refrigerant through the conduit between the indoor and outdoor units. The dampening device is comprised of plural vibration dampening elements spaced along the conduit, with the spacing between adjacent elements corresponding to the wavelength of a natural vibratory frequency of the conduit. The device is preferably located proximate to the compressor and inside of the outdoor unit cabinet in which the compressor is housed. Various embodiments of the dampening device are disclosed.

Abstract: The invention provides a vibration isolation mount for a motorized garage door opener system. The mount includes a substantially planar first mounting plate with apertures configured for mounting to structure inside a garage, and a substantially planar second mounting plate with threaded bolt shafts or other mounting elements configured for mounting to motor mounting structure mounted to a drive motor for use in the system. A vibration isolation material, which may be a natural or synthetic rubber, is disposed between the first and second mounting plates to isolate noise and vibration produced by the motor from the structure mounting the assembly to the interior of the garage.

Abstract: An electronic apparatus is placed on an installation surface during use, and ensures comfortable use for users. The electronic apparatus includes a housing and a fan. The housing accommodates an electronic component, and includes a bottom face to be placed on the installation surface during use, and a front face standing from the bottom face to define a front edge of the housing, and facing the user during use. The fan is provided inside the housing to exhaust air out of the housing. The housing further includes an exhaust opening pointing in an obliquely upward and sideward direction, and the air from the fan is exhausted through the exhaust opening.

Abstract: An air conditioner which includes a plurality of indoor units to cool air of a plurality of rooms. Included is a plurality of branch refrigerant lines that each include a backflow prevention part provided at an end of the branch refrigerant line and/or a pulsation dampening part provided at an end of the branch refrigerant line, adjacent to the main refrigerant line. The air conditioner acts to prevent a liquid part of the refrigerant from flowing in a reverse direction into idle indoor heat exchangers. Furthermore, because a pressure pulsation of the refrigerant is dampened by the pulsation dampening part before the refrigerant is supplied into the indoor heat exchangers, the air conditioner reduces vibration, and, thus, noise from the indoor heat exchangers which is caused by the pressure pulsation of the refrigerant.

Abstract: Disclosed is a vibration absorbing apparatus for a compressor of a refrigerator. The vibration absorbing apparatus includes: an elastic member for absorbing a vibration generated during an operation of a compressor; a base pan supporting the elastic member; a stand installed in the base pan to prevent the elastic member from being bent; and a stopper installed in an upper portion of the stand to prevent the elastic member from being escaped from the base pan during a vibration of the compressor. The elastic member includes: a body having a plurality of grooves enclosing an interior surface and an exterior surface thereof, and a hollow axially passing through a central portion of the body; and a base being a lower portion of the body and being mounted on the base pan.