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947results about "Inertia effect dampers" patented technology
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Control system for resilient support mechanism such as vehicle suspension mechanism
InactiveUS6314353B1Continuous changeEnhance running stability and comfortDigital data processing detailsNon-rotating vibration suppressionDamping factorRelative displacement
A control system for a resilient support mechanism such as a suspension mechanism of a wheeled vehicle including a damper disposed between an unsprung mass member and a sprung mass member of the vehicle, wherein a damping coefficient of the damper is divided into a linear portion and a nonlinear portion, and wherein the nonlinear portion of the damping coefficient is defined as a control input u and applied with a frequency weight Wu(s), while a vertical velocity of the sprung mass member, a relative velocity of the sprung mass member to the unsprung mass member and a vertical acceleration of the sprung mass member are defined as an evaluation output zp and applied with a frequency weight Ws(s). In the control system, a nonlinear Hinfin control theory is applied to a generalized plant to obtain a positive definite symmetric solution P and to calculate a target damping force based on the positive definite symmetric solution P and a state amount such as the vertical velocity of the sprung mass member, a relative displacement of the sprung mass member to the unsprung mass member or the like.
Owner:TOYOTA JIDOSHA KK
Torsional vibration damper
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.
Owner:DAYCO IP HLDG +1
Enhanced computer optimized adaptive suspension system and method
InactiveUS20050098401A1Minimizing body motionIncrease fluid pressureOperating means/releasing devices for valvesSpringsComputer optimizationControl signal
A system and method for controlling a damping system. The system has at least two dampers for damping between sprung and unsprung masses in the compression and rebound directions. Sensors generate signals based on position and other parameters of motion representative of the displacement between the sprung and unsprung masses. The process determines the appropriate compression and rebound forces to be applied at the wheels. A regulator responds to at least one of the independent compression and rebound control signals for adjusting, respectively, at least one of compression and rebound resisting forces of the dampers between the masses. Compliance for the dampers is emulated with software to produce the desired compliance forces. The distributed controller includes a processor that is responsive to signals representative of the position signals for forming the compression and rebound control signals for the regulator as a function of motion between the masses or a motion of a vehicle in which the dampers are located. The system has the capability of locking the suspension when parked.
Owner:GREAT NORTHERN TECH
System and method for damping vibration in a drill string
A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.
Owner:APS TECH
Device and a method for preventing or reducing vibrations in a cutting tool
Owner:CLAESSON INGVAR +4
Active tremor control
InactiveUS6234045B1Light weightConvenient and efficient transportationAiming meansRotary machine partsInertial massControl system
An active tremor control system for stabilizing against alternating perturbations includes: an inertial sensor for sensing angular motion about a first axis of an object induced by alternating perturbations; an inertial mass independent of the object; and an actuator coupled to the object and the mass and responsive to the inertial sensor for selectively applying a torque to the object representative of the sensed angular motion such that the angular motion about the first axis induced by the perturbation is cancelled, the actuator concurrently applying a reactive torque, equal and opposite to the to the applied torque, to the mass.
Owner:CHARLES STARK DRAPER LABORATORY
Vibration control of free piston machines through frequency adjustment
InactiveUS20070256428A1Minimizing amplitudeReduces and minimizes amplitudeAssociation with control/drive circuitsInertia force compensationVibration controlReciprocating motion
A method and apparatus for minimizing the amplitude of mechanical vibrations of a mechanical apparatus including a linear, freely reciprocating, prime mover coupled to and driving a reciprocating mass of a driven machine in reciprocation at a driving frequency. The coupled prime mover and driven machine have a spring applying a force upon the reciprocating mass to form a resonant main system having a main system resonant frequency of reciprocation. A driving frequency range over which the driven machine operates at an acceptable efficiency of operation is determined and stored. A parameter of the operation of the mechanical apparatus, such as the amplitude of vibrations or an operating temperature, is sensed and the prime mover is driven in response to the sensed parameter at a driving frequency that is offset from the main system resonant frequency of reciprocation, is within the driving frequency range of acceptable efficiency of operation and reduces or minimizes the amplitude of mechanical vibration of the mechanical apparatus under existing operating conditions.
Owner:SUNPOWER
Vibration Reducing Structure for steering wheel
ActiveUS20090218739A1Reduce vibrationAffecting operabilityPortable framesHand wheelsSteering wheelCoil spring
A slider 24 is supported on a holder 19 of a steering wheel 11 via a coil spring 25 so as to be movable in a direction of an axis while an air bag module 20 is supported on a slider 24 via a damper spring 26 so as to be movable in a direction perpendicular to the axis. Since the coil spring 25 does not affect vibration of the air bag module 20 in the direction perpendicular to the axis, it is possible to set a spring constant of the coil spring 25 at a value appropriate for the operation of a horn switch 37, and to set a spring constant of the damper spring 26 at a value appropriate for the operation of the dynamic damper. As a result, it is possible to effectively reduce the vibration of the steering wheel 11 in the direction perpendicular to the axis with the dynamic damper without affecting the operability of the horn switch 37.
Owner:HONDA MOTOR CO LTD +1
Suspension control apparatus
InactiveUS20050178628A1Improve efficiencyCompensation delayPortable framesDigital data processing detailsControl signalControl system
In a suspension control system according to the present invention, a sky-hook command signal B obtained from velocity data obtained by integrating a sprung mass acceleration αu from a sprung mass acceleration sensor 9u and an unsprung mass vibration damping command signal C obtained on the basis of an unsprung mass acceleration αd detected by an unsprung mass acceleration sensor 9d are added together to obtain a control signal A for a damping characteristic inverting type shock absorber 6. The control signal A reflects the unsprung mass acceleration αd that leads in phase by 90° the piston speed. Accordingly, it is possible to compensate for a response delay due to an actuator 11, etc.
Owner:HITACHI LTD
Floating bearing cartridge for a turbocharger shaft
InactiveUS20080019629A1Conducive to stable operationReduced and minimal wearRolling contact bearingsShaftsTurbochargerBearing wear
An improved bearing system for use in high speed rotating machinery, such as a turbocharger, wherein a shaft is rotatably supported by a floating bearing cartridge having axially spaced angular contact bearings each with a set of bearing balls supported between inner and outer races. The bearing cartridge includes an inner spacer sleeve for axially spacing the inner bearing races, and a rotationally floating outer sleeve having a pair of radially inwardly open grooves for removably receiving snap-type retaining rings which engage and axially space the outer bearing races. The axial dimension of the inner spacer sleeve is elongated slightly relative to an axial dimension defined between outboard faces of the installed retaining rings, thereby slightly unloading the sets of bearing balls from their respective outer bearing races. Such slight axial unloading enhances smooth-running operation with minimal bearing wear, while accommodating transient loads during operation.
Owner:CPI HLDG
Piezoelectric liquid inertia vibration eliminator
A tunable vibration isolator with active tuning elements having a housing, fluid chamber, and at least one tuning port. A piston is resiliently disposed within the housing. A vibration isolation fluid is disposed within the fluid chambers and the tuning ports. The tunable vibration isolator may employ either a solid tuning mass approach or a liquid tuning mass approach. The active vibration elements are preferably solid-state actuators.
Owner:BELL HELICOPTER TEXTRON INC
Harmonic force generator for an active vibration control system
A force generator for an active vibration control (AVC) system provides a mass located upon an inner circular member which is movable within an outer circular member to simultaneously complete one revolution about its axis as it orbits within the outer circular member to compensate for sensed vibrations. A crank mounts the inner circular member and a counterweight. The crank is rotated by a prime mover such as an electric motor. The mass will therefore generate a sinusoidal inertial force in a straight line. Multiple systems are suitably arranged to be used in conjunction with one another to provide a wide range of inertial force outputs.
Owner:SIKORSKY AIRCRAFT CORP
Damper for vehicles
InactiveUS6439359B1Reduce weightInhibition effectPortable framesNon-rotating vibration suppressionInterior spaceElastomer
A vibration restraining apparatus for vehicle of the present invention is comprised of a housing formed by a rigid material and having an inner space, and fixed to a vibration transmitting member; a filled member sealed in the inner space of said housing in a non-adhered state with leaving a gap with respect to a vibrating direction of said housing, and formed by an elastic body at least at a surface thereof. When the housing resonates by vibration transmitted from the vibration transmitting member, the filled member contacts inner surface parts located at both sides of the housing in a vibrating direction thereof to exercise a damping character due to an energy loss caused by a sliding friction and a collision. Thus, a large damping character occurs inside of the housing to reduce vibration of the housing effectively. As a result, vibration of the vibration transmitting member is effectively reduced. The vibration restraining apparatus for vehicle of the present invention can be lightened in weight, does not have a temperature dependency, and can exercise the vibration restraining effect for plural resonances having different frequencies.
Owner:SUMITOMO RIKO CO LTD
Tool having damper, cutting method using the same, and manufacturing method of impeller or guide vane of fluid machine
InactiveUS20060275090A1Easy to adjustEasy to manufactureMilling cuttersBoring barsImpellerDynamic stiffness
Disclosed herein is the structure of a damper that is capable of improving the degree of freedom in design to optimize the damping characteristics of the damper and is capable of allowing the damper to be easily optimized and manufactured for a wide variety of dynamic stiffness characteristics of a tool body, and a manufacturing method using the same. A plurality of ring-shaped elastic members are disposed at opposite ends of a weight part. The weight part is connected to the tool body via the elastic members. Consequently, the weight part is moved relative to the tool body. The plurality of elastic members are mounted while spacers are disposed between the elastic members, and the spacers are moved with respect to the weight part in the axial direction thereof. A viscous fluid is filled in the region surrounded by the outer circumferential surfaces of the spacers, the elastic members, and the inner surface of a hollow part of the tool body. Consequently, it is possible to damp the relative movement of the weight part with respect to the tool body.
Owner:HITACHI TOOL ENG LTD
Vibration damper for a tubular drive shaft
InactiveUS6837345B1Improve imbalanceLittle effortRotating vibration suppressionShaftsDrive shaftPropeller
A vibration damper for a tubular propeller shaft in the drive train of a motor vehicle having a mass body mounted concentrically, in the propeller shaft or in a sleeve attached in the propeller shaft, by way of at least one rubber spring element. Metal and / or flexible rubber stop elements that limit the vibration travel of the mass body at least in the radial direction are arranged between the mass body and the sleeve. Alternatively, the mass body and / or the sleeve are configured at least locally, in mutually opposite regions, as stop elements that limit the vibration travel of the mass body at least in the radial direction.
Owner:DAIMLER AG
Drive System
InactiveUS20020062713A1Small sizeSimple designRotating vibration suppressionYielding couplingRotational axisDrive shaft
A drive system that includes a drive shaft, which is or can be brought into torque-transmitting connection with a drive train, a secondary drive system for transmitting torque between the drive shaft and at least one auxiliary unit, and at least one vibration-damping device including a deflection mass carrier with freedom to rotate around a rotational axis and at least one deflection mass, which can shift position relative to the deflection mass carrier in at least one deflection plane. Upon deflection of the at least one deflection mass from the home position relative to the deflection mass carrier, the radial position of the deflection mass changes relative to the rotational axis. At least part of the vibration-damping device can be integrated into part of the secondary drive system.
Owner:ZF FRIEDRICHSHAFEN AG
Active tremor control system
InactiveUS20030006357A1Effective controlManipulation is accuratePerson identificationInertial sensorsControl systemEXTREMITY TREMOR
A light weight, wearable, and balanced active tremor control system including a mount; a proof mass frame moveable with respect to the mount; at least one actuator on the proof mass frame for imparting a force on the mount; a motion sensor for detecting movement of the mount due to tremors; and a controller for driving the actuator in response to the motion sensor.
Owner:CHARLES STARK DRAPER LABORATORY
Systems and methods for active vibration damping
InactiveUS20060272910A1Improve isolationIncrease stiffnessSuspensionsPortable framesAudio power amplifierActuator
An active vibration damping system having a supporting spring for addressing a static force from a payload, and an independent actively isolated damper positioned in parallel between a payload and a source of vibration for damping dynamic force from the payload to an actively isolated point. The actively isolated damper includes a small intermediate mass, distinct and decoupled from the payload mass, and a passive isolator element for dynamic coupling of the isolated platform to the small intermediate mass. The small intermediate mass provides a point to which dynamic forces from the payload may be dampened. The active damper also includes at least one actuator coupled at one surface to the small intermediate mass and coupled at a second surface to the vibrating base platform. A motion sensor may also be provided on the small intermediate mass so as to generate a feedback signal as a function of the movement of the small intermediate mass. The motion sensor together with a compensation / amplifier module and the actuator act as part of a feedback compensation loop for minimizing vibration.
Owner:TECHN MFG
Piezoceramic vibration control device and tuning control thereof
InactiveUS6193032B1Piezoelectric/electrostriction/magnetostriction machinesFuselage insulationElectricityCapacitance
A piezoceramic vibration control device in which stiffness is established by a capacitor in shunt with piezoceramic element of the device. The device can be formed of a stack of piezoceramic elements bonded to one another and precompressed by a spring. A control system is arranged to tune the natural frequency of the vibration control device to a disturbance frequency or s primary structural response frequency by varying the capacitance of the capacitor.
Owner:PENN STATE RES FOUND
Systems and methods for active vibration damping
InactiveUS7726452B2Improve isolationIncrease stiffnessSuspensionsPortable framesAudio power amplifierEngineering
Owner:TECHN MFG
Wind energy installation
The invention relates to a wind energy installation (10) having a rotor (18) which can be driven by wind and has at least one rotor blade (22), having a generator for conversion of the mechanical energy of the rotor (18) to electrical energy, and having a tower (14) on which the rotor (18) is arranged, in which the rotor blade (22) has one or more additional masses (36, 40) and / or active and / or passive oscillation dampers (24), which are designed in such a manner that movements of the rotor blade (22), in particular oscillations, which are initiated by external influences and are directed towards the tower or away from it are prevented and / or damped. The invention also relates to a method for operation of a wind energy installation, preferably of an off-shore wind energy installation, in which one or more components of the wind energy installation, preferably the tower (14), have opposing vibration applied to them in order to reduce / prevent sound waves which result from component vibration and disturb animals and / or people, which opposing vibration counteracts vibration (which produces sound) of the component (14), and reduces or prevents this component vibration.
Owner:DAUBNER & STOMMEL BAU WERK PLANUNG
Mass damper
ActiveUS20140008163A1Reduce tensionSmall sizeRotating vibration suppressionNon-rotating vibration suppressionEngineeringTuned mass damper
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.
Owner:WARTSILA FINLAND OY
Hydraulic power transmission
InactiveUS20110240432A1Effective dampingReduce probabilityRotary clutchesFluid gearingsImpellerEngineering
A hydraulic power transmission includes a pump impeller connected to an input member coupled to a prime mover, a turbine runner rotatable coaxially with the pump impeller, a damper mechanism having an input element, a resilient member engaged with the input element, an output element, and a lockup clutch capable of engaging the input member and the input element of the damper mechanism and releasing the engagement therebetween. The transmission also includes a dynamic damper configured in such a manner that oscillations transmitted to the input member when the input member and the input element of the damper mechanism are engaged by the lockup clutch are absorbed from the input element.
Owner:AISIN AW CO LTD
Tunable vibration absorption device
ActiveUS20060175169A1Easy to optimizeSimple designPortable framesNon-rotating vibration suppressionSemi activeElectricity
A tunable vibration absorption device is provided that is suitable for active or semi-active vibration absorption or damping of vibrations in vibrating structures. It comprises a stack including a force actuator mechanism for generating an axial actuation force and a force sensor mechanism which is responsive to an external force acting on the stack to generate a force signal. A controller unit is electrically connected to the force sensor mechanism for receiving the force signal generated by the force sensor mechanism, and it is also electrically connected to the force actuator mechanism for adjusting the axial actuation force generated by the force actuator mechanism in response to the received force signal generated by the force sensor mechanism.
Owner:ASM ASSEMBLY AUTOMATION LTD
Coulomb friction damped disc brake caliper bracket
A Coulomb friction damped disc brake caliper bracket, wherein damping is provided by Coulomb friction, most preferably at the outboard tie-bar thereof. In one form, at least one clamping member applies compressive force externally to the caliper bracket, and in a second form, at least one interfacial boundary is internally disposed in the caliper bracket. Provided thereby is a mechanically distinguishable surface boundary between two surfaces which are in mutual contact such that a state of Coulomb friction exists therebetween.
Owner:GM GLOBAL TECH OPERATIONS LLC
Planar vibration absorber
A tuned mass damper for attenuating vibrations in a selected plane of a mechanical structure, by magnetically induced eddy current damping. A moving damper mass is coupled to a vibrating mass through one or more flexures that confine relative movement of the damper mass substantially to the selected plane. A magnet structure is rigidly attached to either the vibrating mass or the damper mass, and a conductor plate is attached to the other of these masses. Movement of the damper mass relative to the vibrating mass induces eddy currents in the conductor plate and thereby generates a damping force that attenuates vibration in the selected plane.
Owner:NORTHROP GRUMAN CORP
Apparatus and Method for Regulating Active Driveline Damping in Hybrid Vehicle Powertrain
ActiveUS20100087996A1Avoid problemsHybrid vehiclesAnalogue computers for vehiclesDamping torqueEngineering
The present invention provides an improved method and apparatus for regulating active damping in a hybrid vehicle powertrain. The method includes: monitoring the damping command sent to the active damping system; determining a mean reference point, which may be a filtered value of the damping torque command; determining if the unfiltered damping torque command value switches from one side to the other of the mean reference point; if a switch is detected, determining if the size of the switch exceeds a predetermined minimum; if it does, then increasing a total number of switches; determining if the total number of switches exceeds a switch threshold; if the total number of switches exceeds the switch threshold, determining if the current damping torque exceeds a damping torque threshold; and decreasing the damping torque if the total number of switches exceeds the switch threshold and the current damping torque exceeds the damping torque threshold.
Owner:GM GLOBAL TECH OPERATIONS LLC
Shock absorber
InactiveUS7044219B2Eliminate the effects ofImprove efficiencySurveyDrilling rodsShock waveCentral mass
A shock absorbing tool for use in pipelines and oil wells, particularly in combination with perforation guns comprises a central mass supported on two springs between the end terminal members. The shock wave is absorbed in the free oscillation of the mass. The mass is constituted by a piston assembly. A steel rope permits the shock absorbing tool to be maneuvered within the bore hole without damage to the springs.
Owner:SONDEX
Semi-active shock absorber control system
InactiveUS6904344B2Non-rotating vibration suppressionDigital data processing detailsSemi activeControl system
A semi-active control methodology is provided for a spring / mass system, for example a real-time adjustable shock absorber system. The methodology includes defining a plurality of operating zones based on system parameters and user-definable or preset inputs. The methodology also includes processing to account for non-inertial spring / mass system response and multidimensional forces acting on the system, and an acceleration hedge calculation to accurately define system operation at extrema of travel. The methodology is generally directed at producing a plurality of valve control signals, selecting among the valve control signals, and applying the selected control signal to the valve in a closed-loop feedback system to adjust the energy in the spring / mass system.
Owner:GENERAL KINETICS ENG CORP
Damping apparatus for reducing vibration of automobile body
ActiveUS20100204881A1High damping characteristicsReduce apparent natural frequencyPortable framesVehicle body stabilisationRelative displacementTerminal voltage
A damping apparatus for an automobile is provided, capable of ensuring a high level of reliability while obtaining excellent damping effect with simple configuration. The damping apparatus for an automobile that reduces vibrations of an automobile body may include an actuator that is attached to the automobile body and drives an auxiliary mass; a current detector that detects a current flowing through an armature of the actuator; a section that detects a terminal voltage applied to the actuator; a calculation circuit that calculates an induced voltage of the actuator, and further calculates at least one of the relative velocity, relative displacement, and relative acceleration of the actuator, based on a current detected by the current detector and the terminal voltage; and a control circuit that drive-controls the actuator based on at least one of the relative velocity, relative displacement, and relative acceleration of the actuator calculated by the calculation circuit.
Owner:SHINKO ELECTRIC CO LTD
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