Abstract: A dynamic vibration absorber for a washing machine is provided. The dynamic vibration absorber for a washing machine includes: a mass body; at least one elastic body for supporting the mass body so that the mass body may vibrate; and a guider for limiting a motion of the mass body, wherein the dynamic vibration absorber is attached to the washing machine generating a vibration upon operating to reduce the vibration of the washing machine.

Abstract: A vibration suppressing device and a vibration suppressing method that are capable of obtaining an accurate optimum rotation speed and shortening a time period from generation of chatter vibration to calculation of the optimum rotation speed are provided. The vibration suppressing device 10 includes: vibration sensors 2a to 2c for detecting time-domain vibrational accelerations of a rotary shaft 3 in rotation; and a control device 5 for calculating a chatter frequency and a frequency-domain vibrational acceleration of the rotary shaft 3 at the chatter frequency on the basis of the time-domain vibrational accelerations detected by the vibration sensors 2a to 2c, and when the calculated frequency-domain vibrational acceleration exceeds a predetermined threshold value, calculating an optimum rotation speed on the basis of a predetermined parameter, and rotating the rotary shaft 3 at the calculated optimum rotation speed.

Abstract: A damping member is constructed by: a retaining portion which is retained to a surface 8 of a holding member on the side opposite to a holding surface of a vibration generating source; and a main body portion in which a retaining portion is formed at one end and which is inserted in a through-hole formed in the holding member and is come into pressure contact with the vibration generating source while being elastically deformed when the vibration generating source is fixed by a fixing portion and has a diameter smaller than that of the through-hole. When the vibration generating source is fixed, the damping member is retained to the surface of the holding member on the side opposite to the holding surface of the vibration generating source, is inserted in a through-hole formed in the holding member without being come into contact therewith, and is come into pressure contact with the vibration generating source 3, thereby extending a distance of a path along which a vibration is propagated.

Abstract: A stopper structure includes a first stopper surface and a second stopper surface that are provided between a vehicle body and a rear suspension member that are connected to each other in a manner such that the vehicle body and the rear suspension member are displaced relative to each other. When the rear suspension member is displaced relative to the vehicle body, the second stopper surface contacts the vehicle body to perform a stopper function a predetermined time after the first stopper surface contacts the vehicle body to function the stopper function.

Abstract: A tunable mass damper for use in a vehicle steering system in which a rack and pinion gearing subsystem would otherwise transfer resonant vibrations to the vehicle steering wheel. The mass damper element is a generally cylindrical mass supported and suspended around the shaft extending from the pinion gear by several cantilevered spring elements. The mass damper is tunable by modifying the size of the mass or the size or material or length of the springs so that the damper's resonant frequency for axial oscillation matches the resonant vibrations present at the steering shaft extending from the pinion gear.

Abstract: A body frame of a straddle-type vehicle includes a frame extending along an outer side surface of a fuel tank. A first vibration isolating member is sandwiched between the frame and the fuel tank. Vibration transmitted to the fuel tank through the body frame is damped by the first vibration isolating member. A second vibration isolation member may be sandwiched between a seat of the vehicle and an upper surface of the fuel tank to further damp vibrations. The vibration members may be integrated with a cover of the fuel tank.

Abstract: [Problems] To obtain a vibration isolating device in which a pressure-joint section of an elastic body does not move from a predetermined position in a bracket cylinder part even when the angular difference between a normal vibration input direction and a maximum input direction becomes large. [Means to Solve the Problems] A rubber elastic body (18) is vulcanized and adhered to an outer peripheral surface of an inner cylinder (16), end portions of a pair of pressure-joint sections (26) of the elastic body (18) are pressure-joined to an inner peripheral surface of a bracket cylinder part (12), and the elastic body (18) is pressure-fitted into the bracket cylinder part (12) having a cylindrical shape.

Abstract: A damper component for absorbing and dissipating vibration and/or noise resonating from a device is provided. The damper component includes a viscoelastic damper layer, and a continuous constraining layer intimately contacting and encasing the damper layer. The constraining layer has a greater stiffness and higher modulus of dynamic shearing elasticity than the damper layer. The constraining layer is a molded sheet molding compound that is substantially immiscible with the viscoelastomer to provide a discrete interface between the constraining layer and the damper layer.

Abstract: A clutch damper includes a one-way clutch in combination with a tuned torsional damper incorporated into an accessory belt pulley assembly configured for mounting to the outboard end of the crankshaft of an internal combustion engine. The clutch damper is advantageously applicable for use with electric hybrid vehicles having automatic engine off periods during normal vehicle operation. The clutch damper permits belt driven accessories to be electrically driven when the engine is off. The damper is tuned to dampen torsional vibration present at the crankshaft, thereby extending the life of the crankshaft and the one-way clutch.

Abstract: A vibration damping member to be attached to a vibrating member for damping a vibration of the vibrating member comprises a plurality of plate members which are stacked one over the other in such a manner that they are relatively moveable with respect to each other.

Abstract: A device for damping vibrations in a motor vehicle is proposed, having a structure (3) and a wheel carrier (1) which supports a wheel (2) and is connected to the structure (3) in an articulated fashion by means of links (4, 5). According to the invention, it is provided in the device for damping vibrations according to the invention that a coupling element (13) is arranged between one of the links (4, 5) and the assembly (8). Use in motor vehicles, in particular passenger vehicles.

Abstract: A fitting type damper and a process thereof being capable of increasing largely slipping torque in strength are ones that the large slipping torque can be increased not only when the damper is a new product but also after a heat aging test and/or a durability test are performed. And, the damper is one that ?-mercaptopropyltrimethoxysilane 4, which is an organosilane used as a non-slip agent, is adhered and fitted between a hub 1 formed by some metal parts and a rubber elastic body 3, and between a inertia mass body 2 formed by some metal parts and the rubber elastic body 3.

Abstract: The present invention relates to a vibration attenuation/isolation device. An implementation of the invention provides an improved whole-spacecraft vibration attenuation/isolation by separating the vibration load on the spacecraft that arise from the launch vehicle and fairing into longitudinal and lateral components, and effectively attenuates and/or isolates those components. The invention also provides a general method for reducing vibrations in an assembly by using a vibration control device that separates the vibrational forces into perpendicular components that can be separately damped or attenuated.

Abstract: A propshaft assembly includes a shaft structure having a hollow cavity and an insert member being positioned within the hollow cavity and engaging the shaft structure. The shaft structure vibrates in response to receipt of an input of a predetermined frequency such that a shell mode anti-node is generated. The insert member is located at a position that approximately corresponds to the anti-node and has a compressive strength that is tailored to an anticipated displacement of the anti-node to thereby attenuate vibration of the shaft structure.

Abstract: A torsional vibration damper having a hub carrying a radially projecting flange and an annular inertia mass defining an annular channel encompassing the radially projecting flange and an elastomeric member. An annular compression ring is attached to the opening of the annular channel to axially compress and extrude the elastomeric member to fill the annular channel around the radial flange within the inertia ring. Projections defining an intermittent annular inner rim of the inertia mass extend through openings between the spokes of the hub and cooperate with an annular outer rim of the inertia mass to retain the compression ring.

Abstract: A structural damping assembly includes a bonding plate, a stiffener layer, an elastomeric layer, and a constraining layer. The elastomeric layer is boned between the stiffener layer and the constraining layer. The bonding plate and the stiffener layer extend between, and are preferably in contact with, webs which form a pocket on a substrate such as a transmission support beam. The structural damping assembly uses the energy dissipating properties of the elastomeric layer that is sandwiched between the vibrating stiffener layer and the constraining layer to combat noise due to resonant response while operating as a stiffener that increases the frequency of resonance to a range where coincidental placement with an excitation frequency is reduced.

Abstract: In an engine mount (A) whose axis (X) is oriented in the front to rear direction of a vehicle, a damper weight (12) is embedded within a toroidal stopper rubber (10) fixed at its inner periphery to the rear end of an inner cylinder (2). The damper weight (12) is made of, for example, steel plate to have a spiral form and placed to surround the inner cylinder (2), thereby itself functioning as a spring in the direction of the axis (X). This structure can ensure a necessary mass for the damper weight while saving space, and prevent the occurrence of an uncomfortable shock when a stopper works.

Abstract: An acceleration sensor state detecting apparatus for detecting a state of an acceleration sensor provided at a vibrating body includes a calculating method for calculating a difference between measured results of the acceleration sensor obtained per first predetermined time that is shorter than a vibration period of the vibrating body, and a determining method for determining that the acceleration sensor is in an error state in a case that a state in which the difference calculated falls into a range between a predetermined upper limit value and a predetermined lower limit value continues for a second predetermined time or more.

Abstract: A damper is provided including first and second mass elements and first and second sets of elastic elements. The first mass element is coupled to the second mass element by the first set of elastic elements. The second mass element is coupled to a mounting structure by the second set of elastic elements.

Abstract: A damper for reducing vibrations in a handheld device, tool and/or instrument may comprise a resilient member and a weight. The resilient member may mounted to any portion of a device having a surface suitable for engaging and retaining the resilient member therein, and the resilient member may have an inside surface suitable for engaging and retaining the weight. In some embodiments, additional resilient members may be arranged to engage and retain the weight.

Abstract: A dynamic damper including: a mass member; a support frame member having a substantially rectangular support frame portion surrounding the mass member with a given gap distance therebetween and a pair of support sides opposed to each other in a first direction with the mass member disposed therebetween. A plurality of elastic connecting members are disposed in spaces defined between the support sides and opposing end faces of the mass member, respectively, and elastically connect the mass member with respect to the support sides. The support frame portion is deformed so that the pair of support sides are relatively displaced toward each other, to thereby pre-compress the plurality of elastic connecting members. A method of producing such a dynamic damper is also disclosed.

Abstract: A constrained layer damping assembly for a rigid base member having a substantially planar surface comprises a gas impervious damping layer disposed on the substantially planar surface of the base member, and a load element disposed on the damping layer. The damping layer defines at least one void region extending between the planar surface and the load element, and the load element defines at least one channel for coupling a low pressure to the void region relative to the pressure external to the constrained layer damping assembly to establish a pressure differential between the inside of the void region and the outside of the constrained layer damping assembly. The pressure differential keeps the damping layer under compression and secures the load element and the damping layer onto the base member.

Abstract: In a dynamic damper including: a torque transmissible tube member; a mass member housed within an inside of the tube member concentrically to the tube member; and a pair of elastic members, both ends of the mass member in a center axis direction of the tube member are coupled to the tube member via the pair of elastic members, the mass member includes a large mass section interposed between the pair of elastic members, a length of the mass member in the center axis direction of the tube member is longer than a diameter of the large mass section, and, from among two different bending resonance vibration modes of the tube member, a node of a higher order bending resonance vibration mode is placed at a position between the pair of elastic members.

Abstract: A damper component for absorbing and dissipating vibration and/or noise resonating from a device is provided. The damper component includes a viscoelastic damper layer, and a continuous constraining layer intimately contacting and encasing the damper layer. The constraining layer has a greater stiffness and higher modulus of dynamic shearing elasticity than the damper layer. The constraining layer is a molded sheet molding compound that is substantially immiscible with the viscoelastomer to provide a discrete interface between the constraining layer and the damper layer.

Abstract: A vibration dampener for a vehicle to militate against vibration which results in undesirable noise. In an embodiment, the dampener is used in a steering column in the vehicle to militate against the vibration being transmitted to the hands of a driver during operation of the vehicle.

Abstract: A shock-absorbing device for a motorcycle comprises a tubular cushion made of soft materials and a cover body made of hard materials. The shock-absorbing device is mounted on the middle section of a motorcycle handlebar, whereby the recoil force by a bumpy road on the motorcycle will be transmitted and absorbed by the front shock absorbing springs as well as the shock-absorbing device of the motorcycle handlebar. Further, the two ends of the motorcycle handlebar are respectively provided with rubber handgrips; the trio forming a three-stage type shock-absorbing device.

Abstract: This invention provides a dynamic damper comprising an outer pipe 20, a weight 30 and an elastic body 40, wherein convex portions 21 protruded in the direction of the inside diameter are provided at plural positions along the circumferential direction of the outer pipe so as to hold the elastic body 40 by sandwiching the outer circumferential portion of the elastic body 40 between adjacent the convex portions.

Abstract: The bond strength between a pre-cured elastomeric member and a metal surface is increased by applying a phosphate coating to the metal surface. This is particularly suitable for use in formation of torsional vibration dampeners wherein an elastomeric member is compression fitted between an outer annular ring and a hub thereby decreasing slippage between the annular weigh and the hub.

Abstract: A vibration-damping device includes: a damper mass having a housing member with an accommodation space, an independent mass member housed within the accommodation space with a slight spacing therebetween so that the independent mass member is independent of the housing member and is freely displaceable within the accommodation space of the housing member to come into impact on the housing member via an elastic member; and a metallic spring member to be fixed at a plurality of fixing portions thereof on the vibrative member for elastically supporting the damping mass vibrative member, such that the housing member of the damper mass is fixed to a portion of the metallic spring member through which a principal elastic axis of the metallic spring member extends, and that a center of gravity of the damper mass is located on the principal elastic axis of the metallic spring member.

Abstract: A system and method for absorbing vehicle body vibrations is described. The mechanical self-tuning vibration absorber system is utilized to absorb a body vibration with a varying frequency. In a particular application the absorber system provides for absorbing varying frequency vibrations of a helicopter aircraft body. The vibration absorber system utilizes asymmetrical damping to tune the resonant frequency of the system.

Abstract: A fitting type damper and a process thereof being capable of increasing largely slipping torque in strength are ones that the large slipping torque can be increased not only when the damper is a new product but also after a heat aging test and/or a durability test are performed. And, the damper is one that ?-mercaptopropyltrimethoxysilane 4, which is an organosilane used as a non-slip agent, is adhered and fitted between a hub 1 formed by some metal parts and a rubber elastic body 3, and between a inertia mass body 2 formed by some metal parts and the rubber elastic body 3.

Abstract: A dynamic damper including: a cylindrical metallic mass; a cylindrical fixing member with an inner diameter smaller than that of the metallic mass member; a connecting member connecting the metallic mass member with respect to the fixing member; and a covering member integrally formed with the cylindrical fixing member and the connecting member, and covering the mass member. A plurality of engaging recesses are formed at axial end portions of the mass member to be open in an outer circumferential surface thereof, and a plurality of engaging projections integrally formed with the covering member are held in stable engagement with the engaging recesses, respectively.

Abstract: A multi-sensor, multi-actuator control system for controlling vibration in a mechanical structure. The system employs feedforward and feedback control strategies in tandem. Outputs from adaptive feedforward and modal feedback control loops are added to each other. The control system may be dynamically adapted to the changing physical characteristics of the controlled structure. For example, the plant transfer function estimates for the feedforward unit and the gain for the feedback unit may be calculated as functions of sensed physical parameters (location, mass, etc.), and the plant transfer function estimates may be dynamically modified to reflect time-varying feedback control gains. If desired, the control system may be used to cancel low frequency vibrations (<20 Hz) in industrial processes. The actuators may be formed of electromagnets, fixed armatures and interposed flux sensors. In a preferred embodiment of the invention, the robust actuators are sealed so as to be impervious to fluids and dust.

Abstract: This invention provides a dynamic damper 10, in which convex portions 21 protruded in the direction of the inside diameter are provided at plural positions along the circumference of the outer pipe 20, and an elastic body 40 is held between the convex portion 21 and the outer circumference of the weight 30. A stopper portion 32 which is capable of engaging the convex portion 21 of the outer pipe 20 in the axial direction of the pipe is provided on the weight 30.

Abstract: An apparatus for detecting and reducing excessive amplitude of oscillation of a free piston slidably mounted in a housing. The housing has a vibration absorber, including a mass mounted through a spring to the housing. The mass reciprocates relative to the housing along a path in a phase relationship to the piston. A sensor is mounted near the mass for detecting the amplitude of oscillation of the mass. A controller is connected to the sensor for reducing the amplitude of oscillation of the piston when the amplitude of oscillation of the mass reaches a predetermined maximum.

Abstract: A damper main body of a dynamic damper comprises a long flat mounting plate portion, a rod-like central supporting metal member which is erected vertically in the center of a top face of the mounting plate portion, constituting a supporting member together with the mounting plate portion, cylindrical rubber bushings placed on the central supporting metal member in succession from its bottom side, a coil member, a magnet portion, a yoke and a cylindrical case mounted over the yoke. Grommets, which are cylindrical supporting portions made of rubber elastic bodies, are inserted into mounting holes in side plate portions of the mounting plate portion. The damper main body is fixed on a mating plate member through the compressed grommets such that it is floated over the mating plate member.

Abstract: A lid adapted to be mounted on the cylinder head of an internal combustion engine by attachment screws includes a cap and a carrier element adapted to be attached to the cylinder head by the attachment screws. To achieve an improved sound decoupling, the cap and the carrier element are connected to an elastomer component, with the connection between the cap and the carrier element being, at least in part, exclusively constructed by the elastomer component, and with a space being provided between the cap and the carrier element. The carrier element possesses a substantially straight section arranged to extending preferably at a right angle to the attachment surface of the cylinder head, the substantially straight section of the carrier element, a portion of the elastomer component adjacent the cap, and a portion of the cap adjacent the carrier element extend in a straight line.

Abstract: A damper mechanism for absorbing torsional vibrations in a rotating shaft. The damper mechanism includes a vibration absorbing mechanism and at least one actuator that is controllable to affect the torsional vibration absorbing characteristics of the vibration absorbing mechanism.

Abstract: A dynamic damper for damping vibration of a rotary shaft. The dynamic damper includes a tubular mass member and a rubber elastic member. The rubber elastic member includes an attachment tube press-fitted onto the rotary shaft and an arm. The attachment tube is disposed coaxially with the mass member but nearer to an axial center thereof than the mass member. The arm connects the attachment tube to the mass member. The attachment tube includes a tubular support portion connected to the arm, a tubular attachment portion, and a tubular coupling portion for coupling the tubular support portion with the tubular attachment portion. The tubular attachment portion has larger interference than the tubular support portion.

Abstract: The invention provides a dynamic beater comprising a spring-mass unit, said unit having a mass M and a stiffness K actuated by a drive motor and presenting a device for coupling to a host structure for damping, the beater presenting a first acceleration sensor secured to said mass and delivering a first signal s1, and a second acceleration sensor for mounting on the host structure and delivering a second signal s2, and also having a power amplifier supplying an output signal for controlling the drive motor in response to an input signal E which is a function of a difference between the signals from the first and second acceleration sensors after passing at least one of said signals through at least one lowpass filter and/or phase delay type filter.

Abstract: A propeller controlled active tuned-liquid-column damper (TLCD), which can control and suppress the vibration thereof, such as building, tower, bridge, vehicle, ship, offshore platform, facilities, and instrument, etc. This invention is composed of a passive TLCD, one or more propellers, a gear-shaft unit, a servo-motor, and a computer-control system. One or more propellers are installed in a line along the gear-shaft unit inside the horizontal section of the U-shape vessel, the propellers are driven by a servo-motor controlled by the computer-control system which start the servo-motor to drive the propellers immediately. Both fluid (or water) acceleration and the propellers′ thrust can yield the resistance force to increase the vibration-control ability significantly. The natural period of an open TLCD can be adjusted by only changing the wetted length, whereas a closed TLCD can be adjusted by changing the wetted length, air pressure and air volume in the air chamber.

Abstract: An earthquake shock damper includes two positioning plates, two fixing plates and multiple energy absorbing plates securely sandwiched between the two positioning plates and having the two fixing plates extending out in different directions. Each energy absorbing plate has a mediate portion with a width smaller than that of two distal ends of the energy absorbing plate so that deformation of the energy absorbing plate is able to smoothly absorb energy from the earthquake.

Abstract: A dynamic damper for absorbing vibrations in a rotary driveshaft, including a mass member assembly having a plurality of mass members, each mass member having an inner surface, an outer surface, and an affixing member to affix the mass member to another mass member of the assembly, the mass member assembly being affixable to a rotary shaft.

Abstract: An antivibration apparatus for limiting vibrations of a virbrating element, comprising a mass, two elastic members connected to the mass, and a support member including a metal sheet plate having a central portion and two lateral wings, the lateral wings being fixed respectively to the elastic members and converging slantwise toward the central portion, away from the mass, and the central portion being adapted to be fixed to the vibrating element.

Abstract: A surface connection between mechanical components having intermediate deformable elements between the connected contact surfaces, shaped as segments of solid or hollow cylinders with straight or curvilinear axes and their cross sections are compressed in the radial direction during assembly of the connection, thus allowing for adjustments of relative positioning of the connected components, for compensating dimensional imperfections, and for enhancement of stiffness and/or damping of the connection.

Abstract: Disclosed is a dynamic damping device for a steering system of an automotive vehicle, which equipped with a telescopic steering column, including a plurality of mutually independent dynamic dampers, each including a mass member and a spring member for elastically supporting the mass member to the steering column or wheel. At least two of natural frequencies of the plurality of dynamic dampers are tuned to a higher and a lower frequency range in relation to a central value of a range of variation in a natural frequency of the steering wheel due to an expansion or contraction of the telescopic steering column, within the range of vibration in the natural frequency of the steering wheel. Further, a difference between adjacent ones of the natural frequencies of the plurality of dynamic dampers is made held within 10-40% of the central value of the range of vibration in the natural frequency of the steering wheel.

Abstract: A linear mass vibration damper mounting assembly for interconnecting a longitudinally-extending damper rod or other member with a second member, such as a vehicle frame, includes a central stud attached to the first longitudinally-extending damper rod, an open member at least partially surrounding the central stud, and a pair of elastomeric beam side structures inclined laterally and longitudinally to interconnect the stud with the open member. One of the beam side structures is in compression and the other of the beam side structures is in tension when vibrations are transmitted along the longitudinally-extending damper rod, thus effectively eliminating, or least substantially minimizing, transmission of such vibrations to the second member.

Abstract: A vibration absorber for attaching to a rotatable driveshaft, such as a driveshaft of a motor vehicle. The vibration absorber includes an annular-cylindrical mass member arranged at a radial distance from the driveshaft, a plurality of circumferentially spaced elastic supporting elements shaped to be positioned on the driveshaft, which are firmly connected to the mass member and which, relative to the mass member, extend radially inwardly, and an elastic fixing sleeve shaped to be positioned on the driveshaft. At is one end, the fixing sleeve is firmly connected to the mass member and includes a cylindrical collar portion with a seat face.

Abstract: A vibration-reducing apparatus mounted to a machine that vibrates during operation. The apparatus includes a spring and mass combination tuned to a natural frequency of oscillation substantially equal to the fundamental frequency of the machine's vibration at operating speed. The apparatus also includes at least one additional mass and spring combination tuned to a natural frequency of oscillation substantially equal to another harmonic, such as the second harmonic, frequency of the machine's vibration at operating speed. Thus, the apparatus absorbs the machine's vibration, resulting in a quieter, smoother machine.

Abstract: An antivibration apparatus for limiting vibrations of a vibrating element, comprising a mass, two elastic members connected to said mass, and a support member including a metal sheet plate having a central portion and two lateral wings, the lateral wings being fixed respectively to the elastic members and converging slantwise toward the central portion, away from the mass, and the central portion being adapted to be fixed to the vibrating element.