Abstract: A torsional vibration damping arrangement comprises an input region to be driven in rotation around an axis of rotation and an output region and a first torque transmission path and parallel thereto a second torque transmission path, both of which proceed from the input region, and a coupling arrangement for superposing the torques conducted via the torque transmission paths, which coupling arrangement communicates with the output region, a phase shifter arrangement for the first torque transmission path for generating a phase shift of rotational irregularities conducted via the first torque transmission path relative to rotational irregularities conducted via the second torque transmission path, and a pendulum mass in the phase shifter arrangement and/or in the coupling arrangement.

Abstract: A torsional vibration damping arrangement, comprises at least one deflection mass pendulum unit with a rotatable carrier, a deflection mass, a deformable restoring element, a supporting element which provides the carrier supporting region, wherein a distance between the carrier supporting region and the deflection mass supporting region can be varied through movement of the supporting element at the carrier, and the supporting element is preloaded in direction of a radially inner base position and is displaceable radially outward against the preloading under centrifugal force action wherein that a radial distance of the supporting element from the base position increases degressively with increasing centrifugal force action at least in one rotational speed range and/or in that a spring stiffness of the restoring element increases progressively at least in one rotational speed range through centrifugal force-induced displacement of the supporting element.

Abstract: The present disclosure relates to a frequency tuned damper with an elastic element (7) adapted to connect a vibration body (5) to a surface (3). The elastic element has a wide portion (17) and a narrow portion (19) disposed at different locations along a longitudinal axis (23) which is substantially parallel with the normal of the surface when the damper is mounted, and has a first circumferential mounting groove (11) in the wide portion (17), for attaching the wide portion to the surface, and a second circumferential mounting groove (15) in the narrow portion (19), for attaching the narrow portion to the vibration body. The first circumferential mounting groove extends along an elongated path. This provides a damper that is capable of providing two different resonance frequencies in two perpendicular directions in the plane of the surface, and can easily be aligned in a desired direction.

Abstract: An apparatus is provided for reducing vibrations in a frame of a vehicle. The apparatus may include a housing component and a mass damper coupled to the housing component by a first elastic member and a second elastic member. The mass damper is configured to oscillate in a substantially vertical direction and out of phase with the frame of the vehicle. Disposed within the mass damper is a plurality of steel shots capable of movement in a relatively delayed phase with respect to the mass damper.

Abstract: A vibration mitigation device configured to be fixedly coupled to a generally horizontally extending support member. The vibration mitigation device includes a generally vertically extending housing extending from the generally horizontally extending support member and a reciprocating assembly coupled with and fully enclosed inside of the generally vertically extending housing.

Abstract: The table on which a workpiece is put can travel on a guide rail mechanism relative to a working head with a cutting tool mounted thereon. The table is connected through a nut to a ball screw part to move in an axial direction thereof as the ball screw part rotates. One end of the ball screw part is supported by a bearing and the other end is connected to a servomotor to be rotationally driven. A hollow part is provided in the table to receive therein a damper mechanism part, which comprises a spring, a damper, and a weight, the table and the weight being arranged to enable traveling separately on guide rails. Thereby, even when the workpiece is heavy, the weight can move relative to the table to effectively damp vibrations of the table in a feed direction.

Abstract: A tuned mass damper comprising a frame, at least one bendable spring element being connected from its ends to the frame, and at least one mass element being connected to the spring element at a distance from the ends of the spring element, at least one movable spring support element for adjusting the tuning frequency of the damper, and means for moving the spring support element.

Abstract: A compact vibration reducing apparatus includes a dynamic mass; elastic member which apply elastic force to the dynamic mass so that the dynamic mass vibrates in a parallel to a vibration damping direction; a control mass; an actuator which move in parallel to a length change direction; and a motion direction converting mechanism which moves the control mass to the dynamic mass so that the control mass moves in a vibration damping direction to the dynamic mass through the operation of the actuator. The actuator is supported by the dynamic mass so that the operation direction of the actuator is not parallel to the vibration damping direction.

Abstract: Embodiments are directed to tunable damper embodiments and methods of using the same for damping resonant and non-resonant vibrations present within an object that the tunable damper is secured to. In some cases, the tunable damper may be tuned before, during or after being secured to an object.

Abstract: Actuator arrangement with an actuator (8), a reference mass (22), a spring (24) and a first sensor (26; 42, 43; 32, 36). The actuator (8) applies a force between a first object (2) relative to a second object (16; 54). The reference mass (22) is, in use, supported by a third object (16; 56) by means of the spring (24). The first sensor (26; 42, 43; 32, 36) generates a first distance signal that depends on a first distance (z2; z5,z6; z3,z4) between the reference mass (22) and the first object (2) and is provided to a controller (6) to actuate the actuator (8).

Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.

Abstract: An active damping system for use in connection with a vibration isolation system includes an intermediate mass between a base and an isolated payload. The intermediate mass is supported by at least one support element which also supports at least substantially all of the static forces of the isolated payload. An actuator dampens and isolates dynamic forces acting on the intermediate mass from the isolated payload. The active damping system also includes a payload support element and a passive damping element, both of which are coupled at one end to the payload platform and at an opposite end to the intermediate mass. A sensor is affixed to the intermediate mass to generate a feedback signal to a processor coupled to the actuator.

Abstract: A vibration-damping sheet includes a vibration-damping layer containing 100 parts by mass of rubber and 30 parts by mass or more of carbon black. The iodine adsorption number of the carbon black measured based on BS K6217-1 (2008) “Part 1: Determination of iodine adsorption number (Titrimetric method)” is 30 mg/g or more.

Abstract: An antivibration suspension device (10) comprising at least one tie bar (15) hinged via a bottom end (17) to suspension means (20), the suspension means (20) having a lever (25) extending from a distal end (26) supporting at least one flyweight (30) to a proximal end (27) having a first hinge (35) to a carrier structure (2), a tie bar (15) being hinged via a second hinge (40) to the lever (25). The device includes torsion return means (45) having a rotary actuator (46) with an outlet shaft (47) secured to said lever (25) to generate torque on said lever (25), said device having a computer (50) controlling said actuator (46) to adapt torsion stiffness of the lever (25) to flight conditions.

Abstract: Embodiments are directed to tunable damper embodiments and methods of using the same for damping resonant and non-resonant vibrations present within an object that the tunable damper is secured to. In some cases, the tunable damper may be tuned before, during or after being secured to an object.

Abstract: An apparatus for the damping of vibrations in a steering column in a motor vehicle, having a mounting (10) and an accommodation device (11) elastically supported in the mounting (10) to which a gas generator (20) is secured, a separate supplemental weight (30) is secured to the gas generator (20) or to the accommodation device (11) to provide desired vibration damping characteristics of the steering column assembly.

Abstract: A vibration absorber for damping vibrations of motor vehicle components. The vibration absorber comprises an absorber mass including a passage, and an elastomeric spring member inserted in the passage of the absorber mass. The elastomeric spring member comprises an outer sleeve connecting the elastomeric spring member to the absorber mass, and an inner sleeve for attachment to the motor vehicle component to undergo vibration absorption. An elastomer body interconnects the inner sleeve and the outer sleeve. The elastomeric spring member also includes a securing element. The vibration absorber includes stops that are spaced apart in an axial direction and that cooperate with the securing element to secure the absorber mass in the axial direction.

Abstract: Vibration suppressors can include a resiliently flexible spring system that may be mounted at an exterior of a steering wheel of a vehicle, such as at a hub portion of a steering wheel armature. The spring system can include a fixable portion and a displaceable portion that is configured to be displaced relative to the fixable portion. A mass system can be coupled to the displaceable portion of the spring system and may also be at an exterior of the steering wheel.

Abstract: The invention relates to a damping arrangement for dissipating oscillation energy of an element in a system, more particularly in a microlithographic projection exposure apparatus, comprising an absorber mass, which is mounted via a stable mounting with respect to the element, wherein the absorber mass is arranged in a cavity present within the element and is at least partly surrounded by a fluid situated in the cavity, wherein a mass-spring system is formed by the absorber mass, the system damping a translational movement component of an oscillation of the element that exists at the linking point of the absorber mass, and wherein the stable mounting is formed by a rheological fluid that is electrically controllable or controllable via electric or magnetic fields.

Abstract: An apparatus for use in an active suspension system includes a mass damper for damping a first vertical resonance of a wheel having vertical and horizontal diameters. The wheel defines a wheel plane that passes through a center of the wheel and the wheel's vertical and horizontal diameters. The wheel also defines a transverse wheel plane that is perpendicular to the wheel plane and that intersects the wheel-plane along the vertical diameter. The mass damper includes a damping mass coupled to the wheel. The damping mass is constrained from motion relative to the wheel in all but a vertical direction and has a mass distribution that is asymmetric relative to the transverse wheel plane.

Abstract: A dynamic vibration absorber (1) includes: a weight (2); a frame body (3) which surrounds the weight (2); a total of four pairs of vertically mounted U-shaped leaf springs (4, 5, 6 and 7) which are interposed between the frame body (3) and the weight (2) so as to hold the weight (2) with respect to the frame body (3) movably with respect to all directions in a horizontal plane and immovably in a vertical direction (V); and a damping mechanism 8 for damping the vibration of the weight (2) in the horizontal plane.

Abstract: The present invention provides an active electric torsional vibration damper and a method to realize the same. The invention relates to the field of vibration reduction technology for rotating machinery. The damper comprises a fixed module, a relative rotating module, conducting coils, magnetic-field producing elements. The present invention can be used to produce transient anti-torsion which is same in frequency, opposite in direction and corresponding in amplitude to achieve the effect of eliminating torsional vibration on the original shaft system. The damper realizes a prominent effect of eliminating torsional vibration without complex measures.

Abstract: A device is described for vibration damping, which is attachable on a mechanical structure or integratable therein, having at least one mass which is indirectly or directly operationally linked to the structure via elastic means, referred to as the so-called damper mass, and at least one actuator for changing a stiffness which can be associated with the elastic means. The invention provides an electrical power source, which is capable of generating electrical power exclusively using an oscillating relative movement resulting along the operational link between the damper mass and the structure, and a regulating unit, which is connected to the electrical power source, which activates the at least one actuator as a function of the vibration behavior of the structure based upon a vibration damping rule.

Abstract: A rebound stopper of a strut assembly for a suspension in a vehicle, may include a steel plate combined with a strut and being fitted over an upper end of the strut which has passed into a car body, a rubber plate fitted around an outer circumferential edge of the steel plate, and a mass damper combined with the rubber plate and functioning as a damper by resiliently moving relative to the rubber plate during a rebounding motion of the strut assembly.

Abstract: A rotary supporting member supports a parallel member rotatably with respect to an upper beam. A first brace connects an opposite-end side of the parallel member with an opposite-end side of a lower beam. A second brace connects another opposite-end side of the parallel member with another opposite-end side of the lower beam. An intersection position of the first brace with the second brace is positioned more adjacent to a side of the upper beam than where an intermediate position between the upper beam and the lower beam is present. Damper members dispose respectively so as to be interposed between the parallel member and the upper beam, connecting the parallel member with the upper beam, and being disposed to make a pair at least on both sides each of which is separated away from the rotary supporting member to interpose the rotary supporting member therebetween.

Abstract: A vibration damper includes a rigid base with a mass coupled thereto for linear movement thereon. Springs coupled to the mass compress in response to the linear movement along either of two opposing directions. A converter coupled to the mass converts the linear movement to a corresponding rotational movement. A rotary damper coupled to the converter damps the rotational movement.

Abstract: An impact-absorbing structure includes a vertical hollow column that telescopically receives a post. A coil spring surmounts a centrally apertured support plate that receives and is secured to the hollow column. A coil spring stands atop the support plate and the upper end of the coil spring is secured to a top plate that surmounts the post. A centrally apertured spacer plate is parallel to the top plate and is downwardly spaced apart from it. A plurality of bolts interconnects the top plate and spacer plate. The post retracts within the hollow column and the coil spring is compressed when a downwardly directed force is applied to the top plate. The coil spring unloads and restores the top plate and the spacer plate to their respective positions of repose when the downwardly directed force is removed. Each bolt is engaged by an eye loop at the end of a cable.

Abstract: An electromotive active vibration absorber apparatus mounted to a vehicle to attenuate vibration of the vehicle may include elastic members mounted to an housing, an inner yoke having an upper yoke part and a lower yoke part which are fastened to the elastic members respectively, wherein an inner magnetic substance is disposed between the upper and lower yoke parts, and an outer yoke enclosing the inner yoke and having top and bottom portions dented to form inner and outer support members and a connector spoke and receive coil units therein, wherein the coil units include an upper coil unit and a lower coil unit, the upper coil unit being mounted above the connector spoke and the lower coil unit being mounted under the connector spoke respectively, between the inner and outer support members of the outer yoke, and wherein the coil units are controlled to vibrate the inner yoke when power is applied thereto.

Abstract: A tuned mass damper comprising a frame, at least one bendable spring element being connected from its ends to the frame, and at least one mass element being connected to the spring element at a distance from the ends of the spring element, at least one movable spring support element for adjusting the tuning frequency of the damper, and means for moving the spring support element.

Abstract: An active dynamic vibration absorber apparatus for a vehicle that may be mounted to a frame of the vehicle and vibrates when power may be supplied to attenuate vibration of the vehicle, may include a housing, an upper spring and a lower spring, and a yoke assembly disposed between the upper spring and the lower spring which may be plates arranged in parallel, and selectively vibrates up/down in the housing, wherein the yoke assembly has an upper protrusion and a lower protrusion that protrude from the top and the bottom thereof, respectively, the upper protrusion being fastened to the center of the upper spring through the housing, and the lower protrusion being fastened to the center of the lower spring in the housing.

Abstract: A device (10) for damping the vibration of a structure is provided. The device includes a main mass (12) and an auxiliary mass (20) mounted on a support (11) that is suitable for having one end held fixedly in the structure (1). The auxiliary mass (20) includes a threaded member (21) arranged around a drive screw (40) inside a casing (30) fastened to the main mass (12). The device includes manual drive (50) engaging the drive screw (40) to move the auxiliary mass (20) along the drive screw (40).

Abstract: An apparatus for use in an active suspension system includes a mass damper for damping a first vertical resonance of a wheel having vertical and horizontal diameters. The wheel defines a wheel plane that passes through a center of the wheel and the wheel's vertical and horizontal diameters. The wheel also defines a transverse wheel plane that is perpendicular to the wheel plane and that intersects the wheel-plane along the vertical diameter. The mass damper includes a damping mass coupled to the wheel. The damping mass is constrained from motion relative to the wheel in all but a vertical direction and has a mass distribution that is asymmetric relative to the transverse wheel plane.

Abstract: A vibration damping device for a vibration damping target has a linear member that includes a plurality of wires, which are held so that each of the plurality of wires is relatively displaced in a state that the wires are in contact with one another, and a cover member that covers a peripheries of the plurality of the wires, wherein the plurality of the wires and part of the cover member are fixed to the vibration damping target, and a region of the linear member that flexes through plastic deformation of the linear member is located near each point where the linear member is fixed to the vibration damping target.

Abstract: A production method for an absorber (20) in which a baseplate (24) made of plastic and a support plate (25) made of plastic are arranged at a distance parallel to each other is provided. An elastomer for a spring element (21) is injected between the support plate (25) and the baseplate (24), and a metal mass element (22) is joined positively and/or non-positively to a side of the support plate (25) facing away from the spring element (21).

Abstract: A board-level package includes a printed circuit board, a semiconductor die package mounted on the printed circuit board, a tuned mass structure, and a support structure mounted to the printed circuit board and supporting the tuned mass structure.

Abstract: A method for checking a vibration damper of a motor vehicle in the installed state includes setting start values of the damping constant kA, the spring rate cA, and the body mass mA for a wheel of a motor vehicle; inducing a vertical vibration of the motor vehicle with the aid of a defined excitation sRreal; determining the theoretical body vibration excursion sAmodel; optically detecting the positions of the wheel and the body shell of the motor vehicle at a plurality of detection instants during the vibration; minimizing the error function formed from the deviations between the theoretical body vibration excursion sAmodel and the observed body vibration excursion sAreal at the detection instants, and determining the damping constant kA, the spring rate cA, and the body mass mA therefrom; and determining the damping measure ? of the vibration damper.

Abstract: A torsional vibration damper or a torsionally flexible coupling comprises an inner part and an outer part that is arranged in ring shape around this inner part, which are joined to one another in a torsionally flexible manner by spring elements, wherein the spring elements subdivide a space formed between the inner part and the outer part into a plurality of successive chambers in the circumferential direction of the damper or the coupling, with these chambers being filled with a viscous medium and connected to one another. There are at least two groups of spring elements which have deflection lines that differ in the circumferential direction. In case of a relative rotation between the inner part and the outer part, owing to differences in deflection lines, there is a strong spatial displacement of the damping medium, so that such a damper or coupling has a high damping potential.

Abstract: A system for isolating vibration among a plurality of instruments on a spacecraft includes at least two platforms, each of which is configured to couple to and isolate vibration for a single one of the plurality of instruments. Each of the at least two platforms is configured to mount to the spacecraft. A device is also provided for isolating vibration for one instrument among a plurality of instruments on a spacecraft.

Abstract: An oscillation damper (3) which is designed for being mounted on a housing (2) of a hand-held power tool (1) and includes an oscillating damping mass (4); and at least one spring (5) located completely, with respect to its axial length, within the damping mass (4) for axially compressively preloading the damping mass (4) against the housing (2) of the power tool (1).

Abstract: It is intended to provide a vibration control apparatus that can be installed in a small pace and can be produced at low cost, as well as a wind turbine generator equipped with the vibration control apparatus and a vibration control method. The vibration control apparatus 7 includes a first vibration system 10 of inverted-pendulum type, second vibration systems 20 of inverted-pendulum type which are provided on both sides of the first vibration system 10, a restraining unit 30 which restrains a first weight 11 of the first vibration system 10 and a second weight 21 of the second vibration system 20 and a damper which damps vibration of the first weight 11 and the second weight 21. The vibration control apparatus 7 is installed on an upper floor 8a of a plurality of floors 8.

Abstract: A vibration isolating system is disclosed. The vibration isolating system comprises a passive mechanical system comprising a damping assembly, a first resilient member coupled in series with the damping assembly, and a second resilient member coupled in parallel with the series combination of the damping assembly and the first resilient member. The vibration isolating system further comprises a support member coupled in series with the passive mechanical system, a viscoelastic mount coupled to the support member, and a motion limiter coupled to the support member such that the passive mechanical system transmits a force to the support member when the passive mechanical undergoes longitudinal displacement greater than a predetermined displacement.

Abstract: An elastic coupling device for elastically connecting a damping mass like a gas generator to a motor vehicle part exposed to oscillations and/or vibrations, in particular an airbag module, in one embodiment comprising a rigid support ring facing the vehicle, at least one fixation piece like a rivet head, the fixation piece facing the damping mass and being made of a rigid material, and a spring body coupling the support ring and the fixation piece. The support ring and/or the fixation piece, respectively made of a plastic material, as well as the spring body, which may be made of an elastomer material, may be produced in a single manufacturing step by means of a two-component process, in particular by two-component injection moulding.

Abstract: In order to achieve downsizing, and to prevent a cleaning fluid from staying inside, a dynamic damper for a hollow rotating shaft is provided with a mass body floatingly inserted to an inner periphery of the hollow rotating shaft, of which a vibration is to be reduced, and an elastic body structured such that an inner diameter portion is fitly attached to an outer periphery of the mass body and an outer diameter portion is brought into pressure contact with an inner peripheral surface of the hollow rotating shaft, and made of a rubber-like elastic material, wherein grooves having both ends open to spaces at both sides in an axial direction of the elastic body are formed in one of fitted surfaces to each other of the mass body and the elastic body.

Abstract: A rotational vibration damper includes a primary side (32) and a secondary side (46) which is rotatable with respect to the primary side (32) around an axis of rotation (A) against the action of a damper element arrangement (28). At least one damper element unit (42) of the first group (70) and at least one damper element unit (42?) of the second group (70?) are pre-loaded, and the primary side (32) and the secondary side (46) are pre-loaded in a basic relative rotation position with respect to one another. Proceeding from the basic relative rotation position of the primary side (32) with respect to the secondary side (46), a pre-loading path (V, V?) of at least one pre-loaded damper element unit (42) is shorter than a maximum relative rotation path of the primary side (32) with respect to the secondary side (46).

Abstract: An active dynamic vibration absorber 1 includes a weight 2; a frame 3 which is adjacent to the weight 2 in such a manner as to surround the weight 2 with clearances X1 and Y1; a holding mechanism 4 which is interposed between the weight 2 and the frame 3 and holds the weight 2 movably in an X direction with respect to the frame 3, while holding the weight 2 immovably in a Y direction and a vertical direction V; a detecting means 5 for detecting the relative vibration of a predetermined value in the X direction of the weight 2 with respect to the frame 3; and a moving means 6 for relatively moving the weight 2 in the X direction with respect to the frame 3 on the basis of a detection signal from the detecting means 5 such that the relative movement of the weight 2 in the X direction with respect to the frame 3 is allowed, while the vibrational displacement of the weight 2 in the X direction with respect to the frame 3 is reduced.

Abstract: The absorber for a hand machine tool according to the invention with a linear drive has a case and a body of mass moveable alongside of an absorber axis relative to the case. Force is applied toward a first direction to a first coupling element moveable alongside of the absorber axis, which is coupled with the body of mass using a first spring. Force is applied toward a second direction to a second coupling element moveable alongside of the absorber axis using a second spring coupled with the case. With a movement toward the first direction, the first coupling element is frictionally coupled with the second coupling element and with a movement toward the second direction, it is uncoupled from the second coupling element.

Abstract: A tuned mass damper is provided for use with a structure that vibrates at a first axial surge mode and a second axial surge mode, when exposed to a predetermined frequency range. The tuned mass damper includes a housing, an endcap, two masses, and two springs. The first and second masses are disposed in a housing cavity. The first tuned mass damper spring is disposed in the cavity coupling the first mass and the endcap. The second tuned mass damper spring is disposed in the cavity coupling the first and second masses. The tuned mass damper has first and second resonant frequencies in the predetermined frequency range to damp the first and second axial surge modes, respectively. The second mass resonates at an amplitude that is greater than an amplitude at which the first mass resonates, when the two masses are subjected to the second axial surge mode.

Abstract: A vibration isolator system for attaching a payload to a supporting base is provided, the payload having a center of mass and the system consisting of at least three vibration isolating pods. Each pod has two associated, non-parallel, elastic struts. A first end of each strut is attached to the supporting base and a second end of each strut is attached to the payload at a respective mounting point, and the a projected elastic center of the system is substantially co-located with said center of mass. The vibration isolator system is operable to substantially prevent translational vibration of the supporting base from inducing angular rotation of the payload.

Abstract: A vibration damping apparatus wherein a mass member is elastically supported by a spring member on a vibrating member to be damped for constituting a secondary vibrating system. The spring member is a metal plate spring with one end being attached to the mass member and the other end being attached to the vibrating member. A rubber bushing having an inner and an outer tube member positioned spaced apart from one another in a diametrical direction and linked in the diametrical direction by a rubber elastic body. One of the inner shaft member and the outer tube member of the rubber bushing is fastened to the plate spring while the other is fastened to the mass member or the vibration damping apparatus, whereby the moment is exerted in the torsional direction of the rubber bushing during displacement of the mass member by vibration to be damped.

Abstract: For an elastic coupling member for a three (or more) point connection of a vibration absorber mass, like a gas generator for an airbag, to a motor vehicle part exposed to vibrations or oscillations, like a steering wheel structure, comprising a sleeve-shaped spring body firmly connectable to the vibration absorber mass and the motor vehicle part and having an axial direction, it is provided that the spring body has a different shape in its first radial sectional plane, in particular a vertical radial sectional plane, compared to a second, in particular horizontal radial section plane circumferentially offset from the first one.