Abstract: A torsional damper includes a hub to be secured to a rotating shaft such as crank shaft or the like, the hub having formed thereon a projection extending outwardly in the radial direction of the rotating shaft, and damping rings each together with a respective sleeve being bonded to a respective rubber member by vulcanizing and being fitted to the hub as to enclose the projection from both sides in the axial direction of the rotating shaft. The damping rings are secured to each other, and a viscous fluid is charged in a space defined at least around the projection.

Abstract: A dynamic damper to be mounted on a rotary shaft, such as the drive shaft or a propeller shaft of an automobile, to damp detrimental vibrations generated as the rotary shaft rotates. The dynamic damper is of a sectional type comprising a first end unit, a second end unit and a mass member. The first and second end units are mounted on the rotary shaft opposite to each other, and the mass member is joined fixedly at its opposite ends to the first and second end units. Each of the first and second end units comprises an elastic member integrally having a holding portion which holds to the rotary shaft and a flange portion radially extending from the holding portion, and a holding member fixedly joined to the outer circumference of the flange portion of the elastic member.

Abstract: Damping structural vibrations by applying a multiplicity of discrete untuned passive dampers to a structure. Each passive damper includes a damping element and a damping mass, and the damping element provides damping generally in proportion to the relative velocity occurring between the mass and a point of attachment of the damper to the structure. The damping coefficients of the damping elements are selected so that the dampers increase the effective loss factor of the structure. The passive dampers each have a damping mass which is supported such that the dampers experience an undamped natural frequency below the resonant frequencies and the frequency range of the structure.

Abstract: A helicopter (10) is roll vibration resistant having cantilever spring (40) supported masses (42) located at extreme outboard locations (30). The spring portion (40) extends substantially horizontally and is rigidly secured to rigid structure (28). This vibration absorber (34) is tuned to the forced frequency established by the normal rotor (14) RPM times the number of rotor blades (16).

Abstract: A damper device for a precision assembling robot is capable of dampening the residual vibrations of the robot arm resulting from a lack of rigidity of the arm. The damper device is fixed to the tip of the robot arm to absorb the vibration energy of the swinging robot arm. The damper device includes a cylindrical weight member and a columnar rubber member. The damper device further includes a metallic rod inserted in the columnar rubber member. The length and position of the inserted metallic rod controls the dampening factor of the damper device. Therefore, the precision assembling robot with the damper device is capable of preventing a failure of assembly due to positioning errors resulting from residual vibrations, or nonconformities due to the impact of the robot arm against an object.

Abstract: An improved vibration absorber that overcomes deficiencies of known heavy vibration absorbers that require exact manufacturing tolerance for the rigidity of the absorber in order to generate a sufficiently large frequency range of the vibration absorber. The new vibration absorber has the purpose of covering a larger frequency range with a lower weight by having the absorber mass disposed to be pivotable around a pivot at one end and on an opposite side supports itself on the vehicle body through at least one bearing arrangement. The absorber mass and/or the bearing arrangement are slideably arranged with respect to the pivot. The vibration absorber may be used in vehicles which have a natural vibration in the low frequency range.

Abstract: A dynamic damper of this invention comprises: a pair of ring-shaped fixing members disposed at a predetermined interval, inserted onto and supported by a rotary shaft; a cylinder-shaped mass member having inner surface larger than the outer surface of the rotary shaft, the cylinder-shaped mass member inserted onto the rotary shaft and disposed between the pair of ring-shaped fixing members; and elastic members integrally connecting the ends of the fixing members with the ends of the cylinder-shaped mass member. The dynamic damper has enabled to down-size the configuration thereof while maintaining the performance thereof and to make the installation thereof easier.

Abstract: A vibration absorbing mechanism for a compressor in an automotive air conditioning system is disclosed which comprises a mass which includes a first penetration hole; first and second bushings, each of said bushings including an inner cylinder which is provided with a second penetration hole, an outer cylinder and an elastic member which is disposed and compressed between the outer surface of the inner cylinder and the inner surface of the outer cylinder; and a screw bolt. The first and second bushings are disposed at both ends of the mass to align the first penetration hole with the second penetration holes. The screw bolt passes through the first penetration hole and each of the second penetration holes and then is fastened by a nut. According to the above mechanism, vibration which the compressor receives from an engine through a mounting bracket can be reduced. Therefore, durability and silentness of the compressor also can be improved.

Abstract: A rotational force counterbalancing device comprising a weight linearly moveable between two impact points and mounted on a fruit tree shaker to dampen the attempt of an operating shaker to rotate in the direction of the aligned weights of the shaker. As the shaker attempts to move in one direction, the weight of the counterbalancing device moves in the opposite direction.

Abstract: A vibration damper is used in combination with a ski having an upper surface, a turned up front end, a rear end, and a central ski binding on the upper surface. The damper is between 5 cm and 20 cm long and comprises a viscoelastic sheet flatly engaging the upper surface immediately behind the front end, immediately ahead of the rear end, or immediately ahead of the ski binding and a damper plate with a high modulus of elasticity overlying the viscoelastic sheet. The plate is secured atop the sheet on the upper ski surface. The damper is between 10% and 20% of the length of the ski from the rear end of the ski, between 65% and 75% of the length of the ski from the rear end, and/or between 85% and 97% of the length of the ski from the rear end. A 2 m ski normally has a distance of 180 cm between the rear end of the ski and the start of the front upturned end of the ski.

Abstract: A gas turbine engine rotor assembly has an inertial damper loosely surrounding a portion of the main rotor shaft. The damper is axially compressed between facing abutment surfaces provided on a nut and bevel gear. The damper has two axially spaced rows of circumferentially spaced slots, with the interrupting web portions of each row being circumferentially staggered with respect to one another. The damper is configured and dimensioned so that the axial force exerted by the damper on the nut and bevel gear, the polar moment of inertia of the damper, and the coefficient of friction between the damper end faces and the abutment surfaces, cooperate to effectively damp the excitation of the fifth-stage blades in response to application of a source of vibrations at a particular frequency to the bevel gear.

Abstract: A shaker assembly for reducing vibrations in a vibrating structure includes an eccentric mass which is driven at a selected frequency and which drives a shaker assembly. The resonant frequency of the shaker assembly is controlled by a pair of pneumatic springs so as to reduce the vibrations of the vibrating structure. Force damping is provided by a plurality of double acting adjustable air dashpots.

Abstract: A vehicle suspension system includes a wheel damper in combination with a nonlinear active dynamically controlled system for vehicle suspension.

Abstract: The present invention provides a turbo-molecular pump in which an exhaust action is achieved by virtue of the combination of stationary blades and rotor blades adapted to rotate at high speed and to cooperate with each other to impart momentum to gaseous molecules rushing in against the blades under an extremely low-pressurized condition. Disposed inside the casing are a fixed shaft and the rotor, the latter being movably supported by a pair of active radial magnetic bearings. A motor is interposed between said pair of magnetic bearings. A dynamic damper is provided at one end of the fixed shaft to inhibit the occurrence of vibrations.

Abstract: A damper consisting of two damper pieces capable of being disposed around a rotary shaft and two sets of bolts and nuts. The damper is mounted on the rotary shaft by connecting the two damper pieces by the bolts and nuts. Each of the damper pieces has a mass portion having an inner peripheral surface diverging toward an opening end so as to be out of contact with the rotary shaft and a mounting portion having rigidity lower than that of the mass portion and adapted to be in contact with the rotary shaft when the damper is mounted on the rotary shaft.

Abstract: A viscous torsional vibration damper of the kind operating on the shear film principle has a roll spun annular channel shaped housing providing an annular working chamber within which is mounted an annular complementary inertia mass ring and a viscous damping fluid substantially fills shear film spaces between the working surfaces of the inertia ring and confronting working surfaces of the housing within the chamber. Working surface area of the housing within the working chamber has a spinning roll burnished finish. A roll formed rabbet provides a shoulder seat on one wall of the housing with an edge portion of a closure sealed thereto. Laser welding permanently secures the closure to the housing.

Abstract: A new mass damper that avoids the formation of a higher-order resonance by utilizing the inertial resistance of a flowing liquid is disclosed. This damper solves the problem of an additional new degree of freedom due to the additional mass system associated with the conventional mass damper and makes it possible to control random vibration with a broad spectrum such as earthquakes. Also, several examples in which this damper is used for multilevel structures are disclosed.

Abstract: A vehicle engine suspension system in which, in order to reduce `shake` electrically actuated engine mounts are provided, power being supplied to the engine mounts by a control system responsive to vehicle body accelerations (e.g. in the vertical direction). The arrangement is such that when a tendency of the body to move is detected, e.g. by an accelerometer mounted on the body, the engine mounts are actuated so as to generate, between the engine and the body, forces which are of such amplitude and phase as to reduce the shake of the body.

Abstract: A vibration damper is used in combinataion with a ski having an upper surface, a turned up front end, a rear end, and a central ski binding on the upper surface. The damper is between 5 cm and 20 cm long and comprises a viscoelastic sheet flatly engaging the upper surface immediately behind the front end, immediately ahead of the rear end, or immediately ahead of the ski binding and a damper plate with a high modulus of elasticity overlying the viscoelastic sheet. The plate is secured atop the sheet on the upper ski surface. The damper is between 10% and 20% of the length of the ski from the rear end of the ski, between 65% and 75% of the length of the ski from the rear end, and/or between 85% and 97% of the length of the ski from the rear end. A 2 m ski normally has a distance of 180 cm between the rear end of the ski and the start of the front upturned end of the ski.

Abstract: A pipe vibration reducer is provided by one or more resilient cantilever bar members each secured at its inner end to a clamp assembly mounted on a pipe and extending laterally from a vertical plane through the pipe. The outer end of the cantilever bar member mounts a pipe vibration dynamic mass. In one embodiment each of a pair of cantilever bar members mounts a dynamic mass of the same of different weight. In another embodiment a single dynamic mass extends between and is secured to a pair of cantilever bar members. In still another embodiment a pair of cantilever bar members is secured to a clamp assembly for pivotal adjustment to various positions laterally of a vertical plane through a pipe to which the clamp assembly is mounted.

Abstract: A fluid-filled elastic mount including an elastic body for connection of a first and a second member, a closure member secured to the second member and cooperating with at least the elastic body to define a fluid chamber filled with a non-compressible fluid, a device for dividing the fluid chamber into a first chamber on the side of the first member and a second chamber on the side of the second member, a device for defining a passage for restricted communication between the first and second chambers, and a device for accommodating a pressure difference between the first and second chambers.

Abstract: The device comprises an external inertia element which is fixed to a damping member which is coaxially fixed with respect to a shaft of a stepping motor, in such a way that it can rotate together therewith. The external inertia element comprises a metal mass in the form of an annulus of limited thickness. The damping member comprises a first circular flange to which the annulus is fixed, a second circular flange by means of which the device is fixed to the shaft and an annulus of elastomeric material connecting the two flanges. The materials and the dimensions of the device can be calculated, proportioned and pre-arranged in such a way that the device is compact but can stop oscillations of the stepping motor in a very short time. The device is particularly suited to damping the oscillations of a stepping motor which is used for example for positioning a printing member with respect to a print point or for positioning a recording head with respect to a magnetic disc.

Abstract: A non-linear torque produced by an offset mass rotating on a shaft is balanced over 360.degree. of revolution by a lever arm mounted to the shaft extending in a direction opposite that of the offset mass and a spring means for generating a constant force in the direction of gravity at the opposite end of the lever arm.

Abstract: An elastic engine mount with a dynamic stiffness decreasing in dependence on frequency for damping sound transmitted through solids includes a leaf spring having a central region and ends, an elastomer support disposed on the central region of the leaf spring for transmitting force to the leaf spring in a given direction and loading the leaf spring by bending, and at least two support points supporting the leaf spring, the ends of the leaf spring extending freely beyond the support points forming auxiliary masses coupled to the elastomer support vibrating in a direction opposite to the given force transmission direction.

Abstract: A vibration damping arrangement for a structural member including leaf springs extending horizontally from a vibration absorber body adapted to be attached to the structural member. A set of horizontal-vibration-absorbing leaf springs extends in one horizontal plane while a set of vertical-vibration-absorbing leaf springs extends in another horizontal plane. A weight is mounted on the distal end of each leaf spring. The relative positions of the leaf springs in their respective planes are staggered around a vertical axis.

Abstract: An active vibration stabilizer and isolator for removing vibration between a fixed support and a payload. The vibration stabilizer and isolator adaptable for use with large and heavy payloads or closed cycle applications where a hard or uncompressible stabilizer and isolator is required to isolate vibrations or oscillations from the payload.

Abstract: An apparatus for suppressing torsional and flexural vibrations of rotary shafts which is arranged coaxially to the shaft, has an inner pot constructed as a flange for fixing purposes, an outer rotating ring and elastic damping elements arranged between the pot and the ring including damping elements of a first type which are fixed to the pot and the rotating ring and damping elements of a second type which are only connected to the pot and are separate from the rotating ring. The pot is further characterized by the presence of a plurality of circumferentially distributed slots so that the natural vibration behavior is influenced by speed and improved cooling is effected.

Abstract: A two-chamber engine mount with hydraulic damping includes an engine side to be connected to an engine, fluid-filled chambers having rubber-elastic peripheral walls including a chamber disposed closer to the engine side, an intermediate plate disposed between the chambers having a conduit disposed therein through which the chambers are interconnected, an engine support plate at the engine side having a first membrane chamber formed therein, a first membrane closing off the first membrane chamber, the intermediate plate having a second central membrane chamber formed therein, and a second membrane closing off the second membrane chamber from the fluid-filled chamber to the engine side.

Abstract: A cavity closure, such as an engine accessory or inspection cover, is provided having separate rim and central panel members secured together by a vibration absorbent elastomer which acts both to seal a gap between the memebrs and the outer periphery of the closed opening against leakage and to minimize noise generation by the central panel by damping panel vibrations and isolating the panel against the transmission of vibrations to it from the supporting rim and engine housing. A preferred manufacturing method involves forming the rim and central panel as a unit and then separating them by shearing to form opposed edges of identical configuration which are longitudinally displaced prior to applying the bead joining the members and providing sealing and vibration isolation.

Abstract: The device comprises four identical assemblies evenly spaced apart about the vertical axis of a speed reducer (1), offset 90.degree. from each other and each comprising an isotropic flexible beam (4) carrying a beating weight (14) and connected by its ends to the fuselage, this beam being perpendicular to the vertical axis, and rigid triangulation means (9, 10) connecting the speed reducer (1) to the beam (4) so as transmit its forces and its moments to the beam in a plane parallel to an offset from said vertical axis of the speed reducer (1).

Abstract: A device for damping vibrations of an overhead conductor. The device comprises opposed weight halves, each having spherical outside surfaces. The halves are made of a relatively heavy metal material cast in a sand-casting mold. A housing structure is provided that is made from two stamped halves of lightweight metal. The lower portions of the housing halves are located and secured between the weight halves. The stamped halves resiliently secure opposed hollow elastomer damping members between a sand-cast clamp arm and opposed inside surfaces of the housing structure. Pin means wholly located within the weight halves secure the weight halves and stamped halves together, the housing structure retaining the hollow damping members between the stamped halves and clamp arm.

Abstract: A dynamic damper includes a metallic weight having a predetermined resonance frequency, a support member to be connected to an oscillating member in a vehicle to which the damper is applied, a rubber resilient member bonded by vulcanization to the metallic weight and the support member, a cover member attached to the support member in fluid-tight sealing relation thereto and encircling the support member, the resilient member and a part of the metallic weight, and a membrane secured on the metallic weight, a peripheral end portion of which is in fluid-tight contact with an inner peripheral wall surface of the cover member and is slidable therealong.

Abstract: A two-chamber engine mount with hydraulic damping includes a housing having rubber-elastic peripheral walls and an engine side to be connected to an engine, an intermediate plate dividing the housing into fluid-filled chambers being in communication with each other through a penetration formed in the intermediate plate, and an active vibration generator being integrated into one of the fluid-filled chambers closest to the engine side and being controllable in dependence on predetermined operating parameters.

Abstract: A hydraulically damped mounting device has two anchor parts, in the form of a sleeve and a tube, connected together by a resilient wall. The resilient wall and the sleeve define a working chamber for hydraulic liquid which is connected to a compensation chamber by a passageway. The passageway may extend directly through the tube or peripherally of the sleeve. The compensation chamber is bounded by a bellows wall, permitting the volume of the compensation chamber to change freely as vibrations of the tube relative to the sleeve change the volume of the working chamber, without the bellows wall being subject to tensile stresses. The sleeve may be formed in two parts which are forced together during manurfacture, enabling a compact construction to be achieved.

Abstract: A device for damping vibrations of an overhead conductor comprises a die cast weight and housing comprised of opposed weight and housing halves located on opposed sides of a clamp arm and having spherical outer surfaces to minimize corona and tooling costs. The clamp arm is located between two tubular elastomer damping elements secured in place between the clamp arm and the weight and housing halves. The damping device, in addition, includes a pin that secures the weight and housing halves, clamp arm, and damping members together in a sandwich-like construction.

Abstract: A vibration dampener for dampening vibration in a brake rotor comprising two elongated, flexible, stretchable, tubular members, one of which is shorter than the other. Weights are attached to the two members. Links connect the two members end-to-end in a closed loop capable of being stretched over the periphery of a relatively large diameter brake rotor. The links are releasable so that the shorter tubular member may be removed and the ends of the longer tubular member connected together in a closed loop capable of being stretched over the periphery of a smaller diameter brake rotor.

Abstract: A mobile crane comprises a vehicle chassis mounted on balloon tires, a crane boom pivotally mounted on the chassis, and a double-acting boom hoist cylinder connected between the chassis and the boom for raising and lowering the boom. As the mobile crane traverses rough terrain or accelerates or decelerates, its mass causes the chassis to deflect (bounce or porpoise) relative to the terrain. A deflection reduction system, which presupposes that the boom is unrestrained and free to pivot (deflect) relative to the chassis, comprises a deflection reduction module mechanically mounted on the outside of the boom hoist cylinder and selectively operable valves for hydraulically connecting the module thereto.

Abstract: Hydraulic-vibrationally damping rubber mount for motor vehicles with two rigid end surfaces opposite one another in the axial direction and at least two chambers containing damping fluid arranged one after the other, whereby the chambers are connected with one another by means of a choke point. The partition delimiting the two chambers is designed rigidly in the outer region, and held in an axially-movable manner in the inner region. There is a fixed body included in the center. The elastic wall, by means of its flexibility, prevents any cavitation in the rubber mount. At the same time, the fixed body can be used as a tuned vibration-absorption mass for the frequency-dependent reduction of the dynamic spring rigidity.

Abstract: A two-chamber engine mount with hydraulic damping, includes a housing, an intermediate plate disposed in the housing dividing the housing into an upper chamber above the intermediate plate and a lower chamber below the intermediate plate to be filled with fluid, the intermediate plate having a damping opening formed therein hydraulically interconnecting the chambers for preventing a hydraulic response upon the occurrence of high frequency and low amplitude vibrations, upper and lower rubbery elastic peripheral walls at least partially defining the upper and lower chambers, respectively, a motor support plate adjacent the upper chamber, the support plate having a membrane chamber centrally formed therein, and a rubbery membrane separating the membrane chamber from the upper chamber, the rubbery membrane including a solid central quenching mass.

Abstract: This invention relates to an adjustable vibration damper for absorbing energy causing vibratory noise in automotive vehicles, and particularly to a damper capable of adjustment to absorb a range of frequency. The damper comprises an inertial weight of a mass suitable to be effective as a tuned energy absorber having at least one suitably placed aperture therethrough to receive a frictionally interfacing mass of readily compressible elastomeric material.

Abstract: The invention relates to an apparatus for damping vibrational deflections of periscopes or other vessel devices, which periscopes or other vessel devices extend into an aqueous medium when in use. Particular uses for the damping apparatus include application to periscopes, antennas and the like, for submarines. The damping apparatus preferably comprises a damping mass suitably mounted on a periscope or other extended-in-use device by damping elements. The damping elements may include, for example, elastic springy elements having a high internal friction, friction dampers, and coil springs which dissipate vibrational energy. The damping mass moves in response to vibrations of the damped device, thereby functioning as a kinetic energy storing device. The damping elements interact with the movement of the damping mass and thereby function as potential energy storing means.

Abstract: A positive electronic feedback circuit for mechanical vibration damping. The feedback circuit is connected from an output transducer fixed to a vibratable structure to an input transducer fixed to the structure. Preferably the feedback circuit has an output signal with a phase about 90 degrees lagging its input signal. Three conditions set forth herein make this possible.

Abstract: A torsional vibration damper comprises an internal flange body and an external inertial body each having a plurality of intermeshing damper laminae fastened thereto along a margin and defining therebetween interstital spaces filled with a highly viscous liquid and sealed off with resilient material. The damper laminae are generally cylindrical and are constructed in difference diameters in such gradation that the desired interstital spaces result between one lamina and the next larger one.

Abstract: A soft-stop mechanism for the carriage of a rotating disk storage system is presented. The mechanism consists of an assembly which is affixed to a nonmoving member of the storage system and a protruding pin on the moving carriage. The assembly has a hole at one end which the pin enters when the carriage exceeds its normal length of travel. The pin first strikes a rubber plate, which eliminates any shock which might be caused by a metal-to-metal contact. The rubber plate is mounted on the end of a piston which moves due to the force of the pin and compresses a cylindrical elastomeric tube. The elastomeric tube can be preloaded to cause a soft stop in a shorter distance without damage to the carriage.

Abstract: A decoupling device for engine mounts having upper and lower liquid chambers containing hydraulic fluid for damping vibrations, includes a diaphragm liquid-tightly fastened to an upper region of the upper liquid chamber defining a diaphragm chamber divided-off from the upper liquid chamber, the diaphragm including a circular rubber body and a vibration-cancelling mass in the form of a central, circular, metallic disc adhering to the circular rubber body, the circular rubber body having upper and lower surfaces, each of the surfaces having two concentric, conical, circular slots formed therein being inclined toward each other as seen in direction from the horizontal central plane of the circular rubber body toward the surfaces thereof, and the slots being extended to the vicinity of the horizontal central plane of the circular rubber body.

Abstract: A dynamic linear vibration damper consisting of a support member and an inertia member assembled by an elastomer for vibration damping purposes. An extension defined on the support member is received within an opening in the inertia member, and an elastomer interposed between the extension and the opening surfaces is installed under tension whereby the resiliency of the elastomer places the elastomer under compression as confined by the opening to frictionally maintain the assembly of the components.

Abstract: Hardbar bumper assembly is supported by and elastically isolated from the vehicle body by resilient energy absorber so that the bumper functions as a mechanical damper for damping internal vibrations occurring within the vehicle during engine operation including idle. The energy absorber effectively dissipates energy of impact loads including frontal corner and side impacts displacing the bumper from a normal operating position.

Abstract: A device for damping vibrations of an overhead conductor, the device including a member adapted to be clamped to the conductor. The member has a clamping portion for engaging the conductor and an arm portion extending from the clamping portion. Opposed sides of the arm portion have rounded depressions provided therein. Spherical elastomer damping elements have portions located respectively in the depressions, and an integrally formed rib that joins the spheres together in pairs. A weight member is disposed adjacent the opposed sides of the arm portion, the weight member having opposed depressions for holding portions of the damping elements that are opposite the portions located in the depressions of the arm portion.

Abstract: A fixed frequency vibration absorber adapted to be fixedly mounted in a fixed vibration prone system. The vibration absorber is of the pendular-type with two dynamic masses suspended in pendular fashion from a base member, and with at least one coil spring acting upon the masses to establish and linearize the vibration absorber natural frequency.

Abstract: A device for damping vibrations of an overhead conductor, the device including a member adapted to be clamped to the conductor. The member has a clamping portion for engaging the conductor and an arm portion extending from the clamping portion. Opposed sides of the arm portion have rounded depressions provided therein. Spherical elastomer damping elements have portions located respectively in the depressions. A weight member is disposed adjacent the opposed sides of the arm portion, the weight member having opposed depressions for holding portions of the damping elements that are opposite the portions located in the depressions of the arm portion.