Abstract: A blade pitch adjustment system comprising a yoke arranged to be moved in a first direction in response to an actuator; a plurality of trunnion pins arranged to be attached to a respective propeller blade; a respective contact surface between the yoke and each trunnion pin such that movement of the yoke causes rotation of the blades, and wherein the contact surfaces differ so as to create different angles of rotation of the blades at different points of yoke movement or actuator stroke.

Abstract: A torsional vibration damping device in which a first rolling contact surface that is curved with a center of curvature at a location offset from a rotation center of a rotating body, which rotates upon receiving a torque, is formed along a circumferential direction of the rotating body at a location offset from the rotation center of the rotating body in a radial direction, and which includes the rolling element that is brought into contact with the first rolling contact surface by receiving a centrifugal force resulting from rotation with the rotating body and that rolls along the first rolling contact surface through torsional vibrations of the rotating body is described.

Abstract: The present invention has an object of providing a cushioning device having a stable and superb vibration-damping property and a metal cover attachable by use of the cushioning device. A cushioning device, which is to be located between an exhaust manifold as a vibration source and a heat insulator as a connection target and connects the exhaust manifold and the heat insulator to each other and cushions transmission of a vibration from the exhaust manifold to the heat insulator, includes a multi-stage coiled and spiral spring for cushioning the vibration, a grommet for joining the multi-stage coiled and spiral spring and the heat insulator to each other, and a collar member located between an attaching bolt tightened to the exhaust manifold and the multi-stage coiled and spiral spring. The multi-stage coiled and spiral spring is formed of a wiring member having a spiral shape as seen in a plan view.

Abstract: An insulating coating (1) with high damping power and suitable for being fastened to a structure (2). The coating comprises a dissipater mesh made up of a plurality of dissipater elements (3) and of nodes (4) with the bottom end (4?) of each node being fastened to said structure (2). Each dissipater element is secured to first and second nodes (6, 7). The bottom ends (4?) of said nodes (4) project from said dissipater elements (3) so as to be suitable for creating an empty space (5) between the dissipater elements (3) and said structure (2). In addition, at least one dissipater element (3) is provided with at least one branch (10, 20) provided with a heavy element (30, 31, 32). The heavy element (30, 31, 32) has a first mass that is greater than or equal to a second mass of said branch (10, 20).

Abstract: A vibration-proof sound box includes a sound box, a first board unit, a speaker, a second board unit, and an engagement structure having a clasp, a holder and a vibration-absorption unit. The clasp has a base portion connected to the first board unit, two clasping arms extending from the base portion, and a clasping space formed between the clasping arms. The free end of each of the clasping arms is formed with a protruding clasping piece. The holder has an accommodating portion connected to the second board unit, and two clasping holes passing through the accommodating portion. The two clasping pieces respectively engage the two clasping holes. The vibration-absorption unit has a main body snugly disposed in the clasping space, and two extension portions extending from the main body. The two extension portions abut the inner wall of the holder.

Abstract: An internal combustion engine having a connecting assembly for a cylinder head (2) includes at least one air- or gas-conducting part (4) that connects to at least one flow opening (3a) of the cylinder (2), in particular an exhaust manifold (5) or an intake manifold, and a sealing element (9) disposed between the air- or gas-conducting part (4) and the cylinder head (2). In order to reduce the assembly complexity and save installation space, at least one fastening means (7) for the air- or gas-conducting part (4) is disposed spatially separate from the sealing element (9).

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: 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: A speaker device with vibration absorbing function includes a main body and at least one damping mechanism. The main body is installed inside a first casing and a second casing for generating sound. The at least one damping mechanism is connected to the main body and includes a sheathing member, a sleeve member and a resilient member. The sheathing member is disposed on the first casing and located in a position near the main body. The sleeve member is connected to the main body and sheathes the sheathing member in a slidable manner for transmitting vibration generated by the main body as generating sound. Two ends of the resilient member are respectively installed inside the sheathing member and inside the sleeve member for resiliently abutting against the sleeve member, so as to absorb the vibration transmitted from the sleeve member as the main body generates sound.

Abstract: The present invention relates to a device for passively reducing the noise vibrations in a liquid resulting from a sound source which is arranged below the liquid level of a body of water, the device comprising a noise-insulating pipe which is designed to be arranged around the sound source, wherein the pipe comprises a number of telescopically extendable and retractable pipe sections, fastening means for attaching at least one first and one second pipe section to one another in extended and/or retracted position, wherein the fastening means are designed to allow the mutual displacement of the pipe sections in a starting position and to attach the pipe sections to one another in a fastening position, and wherein the fastening means are also designed to keep the first and second pipe sections substantially acoustically disconnected in the fastening position.

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 noise attenuator for reducing clicking and slamming noises produced by the closing of a door includes a thin elongated rectangularly-shaped flexible, resiliently deformable padding member having D-shaped elastic strap loops protruding from opposite short vertical edges of the padding member. One of the strap loops is stretched to fit over a first door knob to thereby hang the attenuator from a first door knob preparatory to use. The padding member is pivoted to a horizontal use position over the door latch and the second loop stretched to fit over the second door knob. When the door is closed, the padding member prevents contact between metal parts of the door and door casing latching mechanism and prevents slamming contact between the door and members in the door casing.

Abstract: An apparatus and a method for the excitation and/or damping and/or detection of structural oscillations of a plate-shaped device by means of a piezoelectric strip device are described.

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 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: For application in a clothes dryer, a quieting device acts to considerably reduce the noise from objects hitting the drum as clothes are being spun dry. The quieting device comprises padding applied to inside surfaces of the drum, the padding including an adhesive on a side thereof, the adhesive for adhering the padding to the inside surfaces. Preferably, the adhesive is a pressure-sensitive, heat-resistant adhesive. In an embodiment of the invention, the padding includes a plurality of strips of the padding, each of which is placed on the inside surfaces of the drum between the dryer fins. In alternative embodiments, the strips of padding can be placed atop the dryer fins. In an embodiment of the invention, the material includes a plurality of holes to allow for heat from the drum surface to escape through the holes, so the device does not inhibit drying of the clothes.

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 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: 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: Methods and apparatus for providing a sound suppressor device including a first plate, a second plate in opposition to the first plate, and a connector between the first and second plates such that the first plate, the second plate, and the connector define a sealed cavity containing a gas at a pressure, wherein the device has a resonant frequency selected to vibrate out-of-phase with respect to a noise source for suppressing noise from the noise source while the noise source and the device are immersed in a liquid.

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 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-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.

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 air filter system for an internal combustion engine of a vehicle can have an indicator for signaling restricted flow of air through a replaceable air filter member mounted to a filter assembly. At least one sidewall can be associated with the replaceable air filter member to be positioned with an air stream passing through the air filter member. A resettable air filter status indicator can provide a visually perceivable signal external of the filter assembly. The resettable air filter status indicator can be integrally formed in the sidewall for indicating if a mounted air filter member requires replacement in response to air intake differential pressure with respect to atmospheric pressure on a downstream side of air flow through the replaceable filter member being above a predetermined threshold value.

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: In a vehicle exhaust system support structure, an upstream side exhaust pipe connected to an engine is guided to an inlet of a muffler supported on a vehicle body, and a downstream side exhaust pipe coupled to an outlet of the muffler is disposed in the interior of a rear bumper. The upstream side exhaust pipe and the inlet of the muffler are coupled to each other via a flexible tube, thus floatingly supporting the upstream side exhaust pipe in the muffler. The downstream portion of the upstream side exhaust pipe passes through the interior of the flexible tube, and is inserted into the inlet of the muffler.

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: 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: A bumper/muffler assembly is provided comprising a bumper; and a muffler having an outer shell. The outer shell may be formed from a non-high impact resistant material, such as a thin metal or a composite material. The muffler may comprise a separate element from the bumper, which is coupled thereto, or is formed as an integral part of the bumper.

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: 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: 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: This invention provides a baffle isolation system for isolating a baffle from a housing in a loudspeaker mounting system. The isolation system may include an isolation mechanism that insulates the baffle from the speaker housing. The isolation mechanism may include a bumper member coupled to a hollow shaft. In another embodiment, the bumper member may also include at least two resistant members located on either side of the bumper and coupled to the hollow shaft. These resistant members act to acoustically reduce sound penetration through the isolation system. Radial isolation may be achieved by the bumper acting to reduce the transmission of vibrations from the baffle to the housing, while longitudinal isolation may be achieved by the resistant members. Ideally, the bumper and the resistant members may be manufactured out of an elastomeric material and may be designed as separate members or as one unitary member.

Abstract: A vibration dampening speaker mounting assembly includes a flush-mountable frame for mounting to a wall or ceiling, at least one vibration dampening member, and a baffle for supporting a single or multi-driver transducer array. The at least one vibration dampening member is disposed between the baffle and the frame to reduce acoustic distortions coupled to the wall/ceiling from the baffle. Fasteners are provided that permit installation of the baffle to the frame without tools while avoiding significant acoustic coupling between the baffle and the frame through the fasteners.

Abstract: A vibration reducing apparatus comprising, a baffle subject to vibration, a first electroacoustical transducer characterized by a first mass seated in the baffle, a second electromechanical transducer mechanically connected to said first transducer or said baffle in the vicinity of the periphery of the first transducer. The rear sides of the diaphragms of the first and the second transducer are not connected to the listening area. The first transducer and the second transducer are constructed and arranged to receive a common electrical signal so that the movable element in the first transducer and the movable element in the second transducer move in phase opposition in response to the common electrical signal to significantly reduce the vibrating force imparted to the baffle.

Abstract: A shock wave source has a coil carrier, a coil, having a metallic membrane separated from the coil in insulating fashion for generating shock waves. The coil carrier is formed of a material that damps the formation and/or the propagation of audible acoustic waves in the generation of shock waves.

Abstract: To make it possible to fit a vibration-proofing member into a hollow pipe, without impairing the appearance and without increasing the number of component parts. A hollow pipe formed by extrusion of a light alloy is integrally provided on an inside surface thereof with a rib extending along the longitudinal direction of the hollow pipe. A vibration-proofing member for restraining vibration of the hollow pipe is inserted in the hollow pipe so that the rib holds a position thereof in the hollow pipe in a direction orthogonal to the longitudinal direction.

Abstract: A shock wave source has a coil carrier, having a longitudinal axis, a coil and a metallic membrane separated from the coil in insulating fashion for generating shock waves. The coil carrier has a generated surface, a first cover surface facing toward the coil and a second cover surface facing away from the coil. For reducing the low-frequency sound generation when generating shock waves, a cross-sectional area of the coil carrier intersected at a right angle by the longitudinal axis has a non-circular contour. A reduction of the audible sound generation when generating shock waves can also be achieved when the second cover surface of the coil carrier is non-flat.

Abstract: A noise elimination device for a table height adjustment includes a base, a tabletop, an engaging member, and a noise eliminating plate. The base has a lower pipe extending from one end upwardly, and the tabletop has an upper pipe extending downward from one end. The engaging member is mounted in the lower end of the upper pipe, which then is inserted into the lower pipe of the base. The engaging member has a hole with a fixed plate underneath. The noise eliminating plate is made of soft material and secured on the top of the fixed plate with a scratching end at one end thereof to engage with the inner wall of the lower pipe when moving the upper pipe of the tabletop within the lower pipe in a silent way.

Abstract: An air filter for an internal combustion engine includes an air filter housing, the walls of which encompass a filter compartment in which a filter element is positioned, having an intake and an exhaust. Openings that can be sealed off or opened up based upon the operating conditions of the internal combustion engine are provided in a least one wall of the air filter housing. In this way, effective modulation of induction noise (sound modulation) can be achieved in a simple way and manner.

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: In a fluidal machine with an impeller rotating to urge a fluid radially outwardly by a centrifugal force, a vane guiding the fluid discharged from the impeller, a vane member which includes a front end of the vane facing to the impeller so that the fluid discharged from the impeller strikes against the front end and which is prevented from contacting the atmosphere, and a casing surrounding the vane member and contacting the atmosphere, the vane member is discrete from the casing, a vibration propagation between the vane member and the casing is prevented or restrained, and a vibration of a pipe extending from the casing is absorbed.

Abstract: An exhaust system support structure is provided with a vehicle body bracket, a vibration insulating member and an exhaust bracket. The vehicle body bracket has a base part that is coupled to a vehicle body member, and a pair of support parts extending from the base part. The vibration insulating member is coupled between the support parts. The exhaust bracket has a first end coupled to the vibration insulating member and a second end coupled to an exhaust system member. The vibration insulating member includes a housing part that houses the first end of the exhaust bracket. The support parts can be linked together with a linking part. Vibrational displacement of the vibration insulating member is suppressed by a regulating body protruding from the vehicle body bracket side of the vibration insulating member and a regulating body protruding from the linking part side of the vibration insulating member.

Abstract: To make it possible to fit a vibration-proofing member into a hollow pipe, without impairing the appearance and without increasing the number of component parts. A hollow pipe formed by extrusion of a light alloy is integrally provided on an inside surface thereof with a rib extending along the longitudinal direction of the hollow pipe. A vibration-proofing member for restraining vibration of the hollow pipe is inserted in the hollow pipe so that the rib holds a position thereof in the hollow pipe in a direction orthogonal to the longitudinal direction.

Abstract: A telescopic buffer device has two slide racks, a plurality of covers disposed on the slide racks, a plurality of connection plates, a plurality of positioning plates, a plurality of shafts, and a plurality of roller wheels. The covers are connected telescopically. Each connection plate is disposed on the corresponding cover. Each connection plate has a U-shaped recess. Each positioning plate has an L-shaped slot to receive the corresponding connection plate, a lower notch, a through hole, and an arc-shaped lower end. Each roller wheel is inserted in the corresponding lower notch of the positioning plate. Each shaft is inserted through the corresponding through hole of the positioning plate and the corresponding roller wheel.

Abstract: An arrangement for acoustically uncoupled mounting of slightly vibrating components on an anchoring part has a first sleeve which is adapted to guide through an opening of a component, a mounting screw which extends through the first sleeve, an uncoupling element adapted to be arranged between the component and the anchoring part, a second sleeve mounted coaxially to the first sleeve, a ring-shaped disc provided on each end of each of the sleeves, so that one of the discs is locatable between the anchoring part and the component at the other of the disc is locatable between the component and a head of the screw, the uncoupling element being adapted to be arranged between the component and a disc facing the anchoring part.