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: An engine cover has a cover body having a through hole penetrating both sides of the cover body in an area opposed to a resonant space in which resonant sounds are generated. An opening of the through hole is covered with the sound absorbing member layer. Because a part of the resonant space is open, resonant sounds generated in the resonance space are decreased.

Abstract: A vibration-absorbing structure for support section of a self-vibratory electronic member. The vibration-absorbing structure is integrally made of resilient gum material and has a top face, a bottom face, at least one insertion section between the top and bottom faces and at least one horseshoe-shaped or annular spacer (bellows) structure having multiple continuously winding layers and connected between the insertion section and the top and bottom faces. The top and bottom faces are fixed on a support article and the support section of the electronic member is fitted in the insertion section. Each annular spacer structure defines a resiliently extensible interval to enlarge the vibration-absorbing space and create a vibration-absorbing effect as a reciprocally extensible spring.

Abstract: A bulk modulus elastomeric element is employed in the present invention. The material from which the invention is fabricated is formed as a sheet, which has a plurality of channels that run through, or partially through it. The holes in the sheet are angled such that the remaining material may be of a parallelogram shape. The top and bottom surfaces of the particular element may be rectangular, circular, hexagonal, or other shapes, since the shape of the end surface is not important to the invention. An edge of an upper end surface is displaced from a remote edge of the lower surface so that a vertical line from one edge normal to the upper surface, is displaced from the remote edge of the lower surface, so that it preferably does not intersect any part of the lower surface when no forces are applied to the surfaces. However, in some instances, under load, a small overlap at the cross-sectional areas of the upper surface and lower surfaces, may be desirable.

Abstract: A damper for a speaker includes an auxiliary damper 12 impregnated with a thermosetting resin, a laminate film 121 laminated on the auxiliary damper 12, and a primary damper formed on the auxiliary damper 12 or the laminate film 121. Alternatively, the damper may include the auxiliary damper 12 impregnated with the thermosetting resin (phenol) and coated with a coating agent, and the primary damper formed on the auxiliary damper and the coating agent 122. Thus, the dual damper which has enhanced reliability in resisting a high power and can be produced at a low cost without variation in the production can be obtained.

Abstract: A stack of sheet elastomers, each having multiple holes therein, dissipates shock forces applied to it. The elastomeric sheets are formed with identical holes each of which have a periphery that is symmetrical around the centers of the holes that extend over a shock dissipation area of the device. The sheets are stacked so that one, or more continuous material passageways are formed through the stack that extend from one support surface to a parallel support surface. This allows for the elastomer material of these passageways to transmit sheer shock forces when a compressive force is applied normal to the support surfaces. Elastomeric, or other material of a composition different, preferably elastomeric, from the material of the stacked sheets, may be filled into holes of the sheets to adjust the characteristics of the device.

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: The active/passive absorber for extended vibration and sound radiation control includes principally two layers. The first layer has a low stiffness per unit area which allows motion in the direction perpendicular to its main plane. The second layer is principally a mass layer. These two combined layers have a frequency of resonance close to one of the main structure. The dynamic behavior of the coupled system makes the active/passive absorber a passive absorbe; however, the first layer can be electrically actuated to induce motion in the direction perpendicular to its main plane. This addition property induces and/or changes the motion of the mass layer and therefore improves the dynamic properties of the active/passive absorber system.

Abstract: The composite sound insulation system for room boundary surfaces includes a sound-proofing layer (D) in communication with the corresponding floor, wall, or ceiling covering (V) which preferably has an inner loss factor &eegr;int of at least 0.1, and more particularly of at least 0.2, and a footfall sound-proofing layer (S) adjoining the floor, wall, or ceiling covering (V) or the sound-proofing layer (D) on the side facing away from the room and having a dynamic stiffness (s′) of at most 20 MN/imn3, preferably of at most 10 MN/m3. The floor, wall, or ceiling covering (V) preferably is a paneling having a thickness of at most 40 mm, preferably of at most 20 mm, and more particularly at most 10 mm, which can be made of two parts, in which case (V1, V2)for instance, at least one sound-proofing layer (D) is arranged between the two parts (V1, V2).

Abstract: A multi-layered metal plate with excellent damping capacity and particularly, to a multi-layered metal plate with excellent damping capacity and a method for manufacturing it, is less costly since the plate can be simply manufactured by simply attaching a thin plate on a main metal plate by the methods such as welding and the like, has excellent damping capacity and especially can be easily shaped. In addition, in the plate, the secondary plate is attached on one or both surfaces of the main metal plate.

Abstract: An improved heat shield offers both a thermal insulation and reduced noise transmission for vehicular engine components, including exhaust manifolds, for example. The structure has three layers: an outer structural metal layer, a center insulation layer to isolate heat and dampen noise, and an inner metal layer directly adjacent the shielded component for reflecting heat back to the shielded component. As disclosed, the heat shield includes at least one bolt aperture for attachment of the shield to a shielded component, such as an exhaust manifold in the described embodiment. The aperture is circumferentially bordered by at least one non-planar undulation defining a protuberance. The protuberance is spaced circumferentially about the aperture. As the bolted connection of the heat shield to the manifold is a major source of vibration transmittal from the manifold into the shield, the protuberance is effective to dampen the vibration, and hence noise associated with the vibration.

Abstract: A sound absorbing structure including a sound absorbing member, an air layer, and a resonant sound absorbing structure. The air layer is formed in the rear of the sound absorbing member. The resonant sound absorbing structure includes a slit and is formed in the rear of the sound absorbing member. The sound absorbing member is a surface plate covering the rear air layer and the resonant sound absorbing structure, and the sound absorbing member is shaped in one of a plate and plane.

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.

Abstract: A noise reduction structure for a cab of a working vehicle, by which a high degree of noise reduction effectiveness can be surely obtained, is provided. For this purpose, the noise reduction structure has a configuration in which a sound-insulating chamber (A; B; C) adjacent to a cab (10a) is provided at a position of at least one of the following: under a floor (11a) of the cab (10a), behind a rear wall of the cab (10a), and at a side of a side wall of the cab (10a).

Abstract: A disc drive top cover incorporates an acoustic damper having alternating constraining layer material and damping layer material. Each constraining material layer is a sheet material having a high mechanical stiffness. Each damping material layer is a visco-damping adhesive having a pre-selected maximum damping efficiency for a particular disc drive operating condition. The acoustic damper may also include a carrier layer between damping layers so that multiple layers of damping material can be incorporated between any two constraining layers.

Abstract: The purpose of the present invention is to provide a cover for a hard disk drive which can prevent the outflow of a damping resin material and the loosening of a screw fixing the cover to a storage-enclosing case.

Abstract: A method and a system for influencing possible structure-borne sound conductions and possible noise radiations of objects which have at least two at least indirectly mutually adjoining and mutually connected components. A spacer body is arranged in the area of the at least indirect mutual adjoining “contact area”. As the result of the spacer body, which can be controllably influenced in its geometry, one of the two mutually connected components and the components which, with respect to the conduction of the structure-borne sound have different acoustic impedances can be excited in a simple manner to carry out vibrations.

Abstract: A vibration excited sound absorber for reducing the sound radiation from a vibrating surface. Each sound absorber has a radiating element which is connected to the vibrating surface by a coupling means. The vibrating surface is partially covered with one or more devices. The dynamic response of the sound absorber is tuned so that the volume velocity of the radiating element is substantially equal in amplitude but opposite in phase relative to the volume velocity of the surrounding exposed vibrating surface. The net volume velocity of the surface is thereby reduced.

Abstract: Vibration absorbers are provided which utilize a torsional spring and a dynamic mass to control vibrations that occur within the structure to which they are attached. Additionally, pipeline systems are provided which utilize such vibration absorbers including a mass and a torsional spring to control the vibrations that occur within the pipeline system. In various embodiments of the present invention, the torsional spring is one or more elastomer elements coupled between the dynamic mass and a support frame to produce a spring force responsive to pivotal rotation of the dynamic mass relative to the support frame. In various embodiments, one or more elastomer elements arranged in series or in parallel may be used as the torsional spring to provide a desired vibratory dampening characteristic for applications, such as pipelines. Use of such torsional springs may provide a more simplified design with less mechanical joints which may be less susceptible to failure in harsh environments.

Abstract: The present invention concerns the reduction of vibrations of a loudspeaker enclosure caused by the mechanical vibrations of the dynamic loudspeaker element by virtue of attaching one or more additional masses to the loudspeaker driver unit using elastic and lossy means. The masses with their elastic attachments dimensioned according to the present invention resonate at frequencies excited by the vibrations of the loudspeaker element at frequencies where the reduction of the amount of vibration is desired. The magnitude of vibration coupled to the enclosure of a loudspeaker modified according to the present invention is significantly smaller than that of a conventional loudspeaker. Furthermore, it is technically and economically advantageous to implement the reduction of mechanical vibrations according to the present invention.

Abstract: A sound generating or emitting machine having a component comprising a material with a high internal damping and tensile strength, the material comprising (1) a metallic base material, and (2) a metallic second phase with an at least partially martensitic structure. The material may also be an alloy comprising a base material in which additional alloy elements have a very low solubility.

Abstract: The present invention concerns a watertight apparatus capable of being immersed in a liquid, for example a watertight watch, including a case (1) with an inner chamber (10) communicating with the exterior, the chamber being separated from the exterior by a membrane (17) which can be deformed, defining, on one side, a non-watertight outer zone and, on the other side, a watertight inner zone, in which is housed, in association with the membrane, an acoustic transducer (22), the membrane being fixed by its peripheral edge (17A) in the chamber (10) and applied via elastic memeber (20) towards its periphery, but at a distance from the edge, against a support surface (12) arranged in the inner chamber (10).

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.

Abstract: A foot device for supporting electronic equipment thereon comprises a sleeve having an axial through bole, and a plurality of balls one by one in line provided in the hole wherein the bottom and top balls are extended above the axial through hole. As such, in use, the electronic equipment is supported by the extended ball of the foot device, while not in contact with supporting plane. This point based contact has the effect of suspending the electronic equipment in the air, thus eliminating interference. Further, the vibration generated by the electronic equipment is not absorbed and interfered by the supporting plane, resulting in a uniform transmission of vibration to all directions without damping or interfering for achieving a maximum quality.

Abstract: A selectively tuned vibration absorber comprising a stack of viscoelastic polymer damping plates, secured together with spacers at both ends and having metal tuning weights attached onto the topmost plate in the stack. The apparatus is secured to the low frequency drive unit of an in-wall loudspeaker with a metal mounting plate between the vibration absorber and the low frequency drive unit. Both ends of the vibration absorber are cantilevered over a tuning mounting plate centered between the ends of the unit, the degree of cantilever and the mass in the metal weights added to the topmost damping plate being variable such that the vibration absorber may be tuned to resonate at the fundamental resonance frequency of the low frequency drive unit.

Abstract: An energy attenuation device for a fluid-conveying line, and a method for attenuating energy in such a line, are provided. The device includes one or more hose sections disposed in the fluid-conveying line, and at least one spring disposed in at least a portion of each of the hose sections.

Abstract: A vibration damped structure, which is excellent in vibration absorption and sound absorption effect, is provided by coating the surface of a structure to be damped with a mixture of molten photopolymerizable resin and a photopolymerization initiator and then subjecting the coated surface to irradiation, whereby a vibration damping coating is formed on said surface.

Abstract: The present invention relates to vibration damped laminate articles having improved force (torque and/or pressure and/or stress) retention and decreased or eliminated spring back. An area defining a through hole and/or the periphery of the article is welded. Methods of making the articles and fastening assemblies including the articles are provided.

Abstract: An in-wall speaker has a variably tuned vibration absorber to absorb and dissipate vibrations in the speaker and surroundings that tend to cause distortions. The vibration absorbing device, including a stack of viscoelastic damping plates, is secured to the speaker or connected structure via a trapezoidally shaped tuning plate, which provides a varying degree of cantilever in different portions of the stack of plates. The effect is to absorb vibrations over a broad range of frequencies.

Abstract: An energy attenuation device for a fluid-conveying line, and a method for attenuating energy in such a line, are provided. The device includes one or more hose sections disposed in the fluid-conveying line, and at least one spring disposed in at least a portion of each of the hose sections.

Abstract: An acoustic panel having at least two compressible, flexible, acoustic foam damping layers separated by at least two rigid layers. In one preferred embodiment, a first rigid layer has a second flexible foam layer spray applied, with a further spray application of a rigid third layer, followed by a spray application of a flexible foam fourth layer, followed by a spray application of a rigid fifth layer, followed by a spray application of a sixth flexible foam layer, finally followed by a spray application of a rigid seventh layer. Sound transmission through this embodiment is especially well attenuated at high audio frequencies.

Abstract: A sound dampening glazing, for example an automotive windshield, in one embodiment of the invention includes a pair of glass sheets having facilities therebetween. In cross section and moving from one glass sheet to the other, the facilities include a polyvinyl butyral sheet, an intermediate sheet having a surface harder than the surface of the interlayer to smooth the interlayer surface e.g. an intermediate polyester sheet, a sheet of dampening material, a polyester sheet, a polyvinyl butyral sheet. In another embodiment, the automotive windshield has two sheets of dampening material, the sheets have sound dampening properties in different temperature ranges to as to provide the automotive windshield with sound dampening properties over a wider temperature range. Methods for making the glazings of the instant invention are also disclosed.

Abstract: An automobile interior component having sound-dampening characteristics has a contact area thereon which contacts a second interior plastic component during operation of the automobile resulting in noise. The interior plastic component has a thermoplastic elastomer self-adhered to the contact area to thereby dampen the noise created at the contact area. A method for making a sound-dampened interior plastic component includes extruding a body of thermoplastic elastomer through a die onto a contact area of an interior plastic automobile component and allowing the extruded body of thermoplastic elastomer to cool, solidify, and adhere to the interior plastic component.

Abstract: A flexible, adhesively attachable, thermal and acoustical insulating shield has a needled, flexible, fibrous batt (40) having an insulating layer (43) of insulating fibers (44) disposed between opposite binding layers (41, 42) of binding fibers (45). Binding fibers (45) of each binding layer (41, 42) are needledly disposed through the insulating layer (43) and an opposite binding layer (41, 42) to provide tufts (46) of binding fibers (45) protruding from the opposite binding layer (41, 42) so as to form a tufted upper surface (47) and a tufted lower surface (48) of the batt (40). A flexible adhesive (50) is disposed and adhered substantially over the upper surface (47) and lower surface (48) of the batt (40) such that the tufts (46) on the upper and lower surfaces (47, 48) are secured to the surfaces by the adhesive. A flexible, protective foil (51) is permanently adhered by the adhesive (50) to the lower surface (48) of the batt.

Abstract: A method for reducing the amplitude of vibration and the pressure wave (6) from a radiating surface (5) and/or an incident surface (3) of a material exposed to mechanical and/or acoustic vibration. The material consists of an anisotropically shaped heavy resilient structure with an internal geometry capable of deflecting and localizing vibration (7) within the structure. A specific material may be incorporated into the areas where vibrational energy is localized in order to convert the vibrational energy into another form of energy.

Abstract: In a magnetizable flat damping component with an acoustic wave damping or suppressing layer (5) with an adhesive layer (2) bonded thereto for securing the damping component to other objects (6) and with magnetizable particles (3) in the damping component the magnetizable particles are integrated into the adhesive layer (2) using binding agents (4).

Abstract: The present invention relates to a vibration dampening/sound absorbing aircraft transparency which includes an outboard pane assembly, a vibration dampening/sound absorbing pane assembly and a spacer frame assembly for retaining the outboard pane assembly and the vibration dampening/sound absorbing pane assembly in spaced-apart generally parallel facing relationship to provide a space therebetween. The vibration dampening/sound absorbing pane assembly is a multilayer laminate which includes a substrate, an adhesive interlayer provided over a surface of the substrate and a sound dampening material layer provided over the adhesive interlayer and adhered by the adhesive interlayer to the substrate.

Abstract: A laminated damping material comprising a layer of high density and high modulus material as a core layer and two layers of higher modulus material being adhered to the core material, the core being sandwiched between the higher modulus layers. The damping material can be further augmented by adhering an additional layer of material exterior to the higher modulus materials if necessary and as needed for the specific application, be it cosmetic, environmental (if resistance to chemical is needed, for example), etc. The damping material can be used for preparing a reinforced composite material which comprises at least one basic multi-layer structure comprising higher modulus material/high modulus panel structure with the layers being bonded with adhesive compatible with both core and outer layer materials and the application where the panel section is used, such as chemical resistance, high heat resistance, etc.

Abstract: A platform is interposed between an electronic component of a sound reproduction system and a support structure to absorb unwanted vibrational energy originating in the electronic component and thereby enhance the sonic performance of the electronic component, the platform having a body constructed of a plurality of layers integrated into the body and having densities progressing from higher densities at outer layers to lower densities at inner layers, with an inner layer recessed relative to the outer layers for facilitating the absorption of unwanted vibrational energy.

Abstract: A truss type extruded aluminum section is formed of a pair of planar plates and ribs, wherein hollow portions are formed within said section by the ribs and the planar plates. Vibration-damping resin is provided on the inner surfaces of hollow portions, and particularly on the inner surface of the planar plate and on a single surface of the inclined rib. With this arrangement, the vibration energy bending the planar plate and the rib is converted into a heat energy. In the case of manufacturing such truss type extruded aluminum vibration-damping section, for making easy the insertion of the vibration-damping resin in the hollow portion, the vibration-damping resin is stuck on a plastic film to form a long planar body. The plastic film serves as a cover or an adhesive. Moreover, in the case of directly inserting the vibration-damping resin sheet, the vibration-damping resin sheet is subjected to embossing on the adhesive-bonding side for allowing air to escape.

Abstract: A constrained damping layer assembly includes a first constraining layer adapted for being secured to a first portion of an aircraft frame, and a second constraining layer adapted for being secured to a second portion of the aircraft frame. A damping material is sandwiched between the first constraining layer and the second constraining layer. The damping material includes a first side, which is adapted for slidably contacting the first constraining layer, and further includes a second side, which is adapted for slidably contacting the second constraining layer. The first constraining layer is adapted for sliding in a first direction upon introduction of a sheer load onto the interior panel, and the second constraining layer is adapted for sliding in a second direction upon introduction of a sheer load onto the interior panel.

Abstract: A composite shelf in a shelf frame supports a plurality of disk drives and attenuates vibrations in the shelf. In the composite shelf, there is a double wall having an outer wall and an inner wall for supporting the disk drives mounted on the shelf. A stiffener between the inner wall and outer wall strengthens the composite shelf to reduce flexure in the composite shelf when the shelf is loaded by disk drives mounted on the shelf. A damping layer is placed between the stiffener and one of the inner wall or outer wall. This damping layer attenuates vibrations in the composite shelf so as to reduce vibrations transmitted from the composite shelf to the disk drives supported by the composite shelf. A second damping layer is placed between the stiffener and the other wall. Both damping layers attenuate vibrations in the composite shelf so as to reduce vibrations transmitted from the composite shelf to the disk drives supported by the composite shelf. A third damping layer may be placed within the stiffener.

Abstract: The passive damping wedge for reducing sound radiation from reinforced structures excited by fluid flow over the outer surface of the structure. The damping wedge is generally attached at the trailing edge of the skin structure on the inner surface. The unique three-dimensional design of the damping wedge provides increased damping which absorbs vibrational energy in the structure. The wedge is made of viscoelastic material with a high damping capacity to maximize the ability to reflect vibrations within. The wedge generally has an elongated base which extends upwards from a flat lower surface. An upper surface tapers downwards from the base into a plurality of spaced apart front end members which extend away from the base. The wedge also has a plurality of pairs of sides, with each pair of sides tapering inwardly to generally define each of the front end members.

Abstract: A multi-layered composite building material is provided which allows effective utilization of forest resources by using so-called low quality materials such as small-diameter wood, old wood, pieces of wood produced as byproducts of lumbering, and/or bamboo. The material can meet various requirements and properties, and can be produced at a low cost. In a structural layer, an adhesive agent is applied to a plurality of finely split pieces which are formed by finely splitting a raw material such as wood or bamboo. The finely split pieces are arranging in parallel to a fiber direction. A shock/vibration-absorbing layer is formed by applying an adhesive agent to small pieces of wood and bamboo and the like. Structural layers and shock/vibration-absorbing layers are alternately arranged to provide a multi-layered structure. The structure is press-molded to a predetermined thickness and optionally heated such that the layers are adhered together to produce the composite multi-layered material.

Abstract: A lightweight acoustic enclosure (1.1), for the reduction of noise transmission from monopole, quadrapole and higher order noise sources via airborne paths at frequencies lower than the approximate ring frequency of the enclosure (1.1), comprising an approximately spherical shaped enclosure (1.1), which is made from stiff materials to reduce the amount of stretching of the enclosure wall and substantially encases the noise source, all structural paths between the enclosure and the noise source comprising vibration isolation (2.4). The thickness of the enclosure wall can be relatively thin. The enclosure (1.1) can comprise multiple concentric layers of stiff material, ideally with adjacent layers having at least one compliant layer, such as foam rubber, sandwiched between them. The enclosure (1.1) can comprise several component parts such as spherical shell elements (1.2), with radii less than that of the approximate radius of the enclosure (1.1). Additional webbings or flanges (1.

Abstract: A sound dampening glazing, for example an automotive windshield, in one embodiment includes a pair of glass sheets. In cross section and moving from one glass sheet to the other there is an interlayer e.g. polyvinyl butyral, an intermediate sheet e.g. a polyester sheet having a surface harder than the surface of the interlayer to smooth the interlayer surface, a sheet of dampening material, an intermediate sheet, an interlayer and the other glass sheet. In another embodiment, the glazing has two sheets of dampening material each having different sound dampening temperature range to provide the glazing with sound dampening properties over a broader temperature range. A method for making the glazing is also disclosed.

Abstract: A shock absorbing foot adapted for supporting an audio equipment on a flat surface, including a base adhered to a flat surface and having a top screw hole, a mounting plate adhered to a bottom side of an audio equipment and having a rounded recess at its bottom center, a receptacle threaded into the top screw hole of the base and having a top open chamber and a rounded recess at the center of the bottom of the top open chamber, and a support member having a plurality of projecting portions disposed in contact with the periphery of the top open chamber and two cones respectively engaging the rounded recess of the mounting plate and the rounded recess of the receptacle.

Abstract: A muffler for structure-borne noise of running wheels of different diameters and/or different frequency spectrums of structure-borne sound vibrations has vibration absorbing elements in the form of members which are arranged next to one another in the circumferential direction, forming a circular disk, and are each connected on the base surface in a force-locking manner with the running wheel. The muffler for structure-borne noise consists of at least a first type of vibration absorbing elements which is always the same for a larger range of running wheel diameters, and at least a second type of vibration absorbing elements which is adapted to the respective running wheel diameter and frequency spectrum of structure-borne sound vibrations.

Abstract: A vibrationally and acoustically insulated structure includes a structure using enclosing a source of internally generated noise and vibrations. The structure further includes a vibration and acoustic insulating device positioned over a portion of the internal surface of the housing and having a vibration damping portion and acoustic absorbing portion. The vibration damping portion, such as a constrained damping layer having a continuous damping layer and a segmented constraining layer of individual rigid segments, reduces vibrations transmitted through the structure housing. The acoustic absorbing portion includes an acoustic barrier layer adjacent the constrained damping layer, an acoustic absorption layer adjacent to the acoustic barrier layer and one or more mounts for mounting the acoustic absorption layer and acoustic barrier layer to the constrained damping layer. The acoustic absorption device reduces the reverberating acoustic waves within the structure housing.