Abstract: A fluid-filled vibration damping device includes an elastic body connecting two mutually spaced-apart first and second mounting members and partially defining a primary fluid chamber filled with a non-compressible fluid, a flexible diaphragm partially defining an auxiliary fluid chamber whose volume is variable, a first partition wall fixed to the second mounting member so as to define one side thereof the primary fluid chamber and the other side there of the auxiliary fluid chamber, a first orifice passage formed at a central portion of the first partition wall for fluid communication between the two chambers, and an annular or cylindrical elastic oscillating plate disposed radially outwardly of the orifice passage so as to continuously extend in its circumferential direction while partially defining the pressure receiving chamber on one side thereof and an oscillating air chamber on the other side thereof.

Abstract: In a manufacturing of an anti-vibration device comprising, an elastic member 3 of a generally truncated cone shape when viewed from a side, a first mounting member 1 is connected to an upper portion thereof, a second mounting member 2 is connected to a lower portion thereof, a stopper projection 12 projects from the first mounting member 1 to a side portion to be capable to abut a half round side portion of the elastic member 3, and a stopper metal member 35 extends from the second mounting member 2 through an outside of the stopper projection 12 to cover the about half round side portion of the elastic member 3 to the first mounting member 1 side with a stopper receiving portion 36 by bending an apex portion thereof to superpose on the stopper projection 12 with a specified gap. The stopper receiving portion 36 can be formed by caulking or the like after the molding the elastic member 3.

Abstract: A fluid-filled active vibration damping device including: (a) an elastsic body which elastically connects first and second mounting members and which partially defines a fluid chamber filled with a non-compressible fluid; (b) an oscillating member which partially defines the fluid chamber; (c) an electromagnetic actuator for oscillating the oscillating member; (d) a stabilizing member which is disposed on the side of the oscillating member that is remote from the fluid chamber, and which is opposed to and spaced apart from the oscillating member in an oscillation direction of the oscillating member; (e) first and second elastic supports through which the respective oscillating and stabilizing members are elastically supported by the second mounting member; and (f) a connecting member which connects the oscillating and stabilizing members, so as to provide a displaceable assembly which is displaceable relative to the second mounting member.

Abstract: A pneumatically operated active vibration damping device is disclosed, which comprises: a first and a second mounting member which are spaced apart from each other and are attachable to a two members of a vibration system; an elastic body elastically connecting the first and second mounting member; a working air chamber adapted to apply an oscillating force between the first and second mounting member, based on a periodic change of an air pressure in the working air chamber; and a volume regulator adapted to regulate a volume of the working air chamber.

Abstract: A novel and improved magnetorheological fluid damper is provided which effectively secures a flux ring to a piston core in a manner which prevents relative axial and radial movement between the flux ring and the core throughout operation. The damper includes crimp portions formed on each end of the flux ring for engaging respective end plates positioned at each end of the piston core to secure the end plates and thus the flux ring to the piston core. One of the end plates may, in turn, function to maintain a piston rod in connection with the piston core. Specifically, each end plate functions as a spring device by being elastically deformed during a crimping process causing the end plates to apply a spring force against the flux ring. One of the end plates may also apply another spring force to the piston rod. A crimping method is also provided which effectively and efficiently permits crimping in a simple manner.

Abstract: An active vibration damping system for damping vibration of a subject member, comprising: a fluid-filled vibration damping device having an elastic body partially defining a primary fluid chamber filled with a non-compressible fluid whose pressure is variable with the elastic deformation of the elastic body, an oscillating plate partially defining an auxiliary fluid chamber filled with the non-compressible fluid whose pressure is variable with the oscillation of the oscillating plate, and a drive means for generating a driving force for oscillating the oscillating plate; and a control device applying an electric drive pulse signal to the drive means and having a pulse signal generator for generating a control pulse signal whose frequency corresponds to that of the subject member's vibration, a phase modulator for modulating a phase of the control pulse signal depending upon a condition of the subject member's vibration, and a driving force regulator for adjusting a waveform of the control pulse sign

Abstract: An elastic mount, especially an engine mount for motor vehicles includes at least two resilient elements connected in parallel to each other. Through force applicators, the two resilient elements are connected selectively to a source of vibration. The mount includes a coupler for selectively engaging the force applicators with the resilient elements. The coupler includes a first coupling element and a second coupling element selectively connectable by an actuator to ensure that only low travel and force components are needed for selection and to ensure that an axial decoupling of the non-effective resilient element exists in the released condition. The second coupling element swivels to be selectively connected to the first coupling element by the actuator. The second coupling element is connectable to the force applicator of the second coupling element in the engaged condition and is configured as a rotary body swivelably mounted in the released condition.

Abstract: A pneumatically operated active vibration damping device is disclosed, which comprises: a first and a second mounting member elastically connected with each other by an elastic body interposed therebetween; a working air chamber adapted to apply an oscillating force between the first and second mounting member, based on a periodic change of an air pressure in the working air chamber; an air piping system connected to the working air chamber and cooperate with the working air chamber to define a negative pressure applied region; a switch valve connected to the air piping system and operable for connecting the air chamber alternately to a vacuum source and an atmosphere for thereby causing the periodic change of the air pressure in the working air chamber; and at least one pressure-regulating valve connected to the negative pressure applied region and optionally operable for introducing the atmosphere into the negative pressure applied region, when the level of the negative pressure in the negative pressure app

Abstract: A controllable damper for resisting movement between two relatively moveable members includes a first member and a second member coupled for relative movement having a working space between them, and a controllable medium retaining structure, for example, an absorbent matrix, to hold a controllable medium only in the working space. A cage preferably supports the matrix. A field generating coil is mounted to one of the first and second members to generate a field acting on the first and second members and the controllable medium in the working space. The rheology change in the medium produced by the field results in resistance to relative movement of the first and second members. A device according to the invention may be used in apparatus, such as washing machines, exercise equipment, air supported tables, and a range of other apparatuses that would benefit from controlled damping or braking. Devices including a two-piece outer housing are described.

Abstract: A vibration control system is provided for an appendage such as an antenna 10 coupled to a platform such as a spacecraft 12. The antenna 10 is coupled at a base 14 so as to extend from the spacecraft 12. A plurality of guidelines 20 extend between remote portions 22 of the antenna 10 and the antenna base 14. A plurality of motion control elements 36 are provided within the antenna structure for reducing oscillation settling time of the antenna 10 relative to the spacecraft 12. The motion control elements 36 include a material disposed therein having its damping response changed according to the magnitude of an electric or magnetic field applied thereto.

Abstract: A vibration control system is provided for an appendage such as an antenna 10 coupled to a platform such as a spacecraft 12. The antenna 10 is coupled at a base 14 so as to extend from the spacecraft 12. A plurality of guidelines 20 extend between remote portions 22 of the antenna 10 and the antenna base 14. A plurality of motion control elements 36 are provided within the antenna structure for reducing oscillation settling time of the antenna 10 relative to the spacecraft 12. The motion control elements 36 include a material disposed therein having its damping response changed according to the magnitude of an electric or magnetic field applied thereto.

Abstract: A fluid sealed type vibration insulating device provided with an actuator for generating an active supporting force. The vibration insulating support device includes a main fluid chamber defined by a conical-shaped elastic support and a movable construction part. The movable construction part is constituted by a partition wall and a magnetic path member which is fastened to the partition wall through a clearance spacer. Therefore, a clearance is formed between the partition wall and the magnetic path and a plate spring is installed in the clearance to support the movable plate against the magnetic force of a permanent magnet. The partition wall has an internal thread hole to be bolted. The magnetic path has a hole with one opening diameter larger than another opening diameter for inserting a bolt. The bolt has a dish-shaped bolt head. If a center of the hole is off to the side of the center of the partition wall's hole, any edge point of the bolt head contacts any surface of the inner hole and pushes.

Abstract: A vibration insulating apparatus and a vibration insulating method disclosed herein is preferably applied to a vibration insulating mount disposed between a vibrating body and a mounting body. Here, the vibration insulating mount comprises a fluid chamber filled with fluid, an elastic support partly defining the fluid chamber, a movable member partly defining the fluid chamber, a resilient member resiliently supporting the movable member, and an actuator generating displacing force for the movable member according to a drive signal so as to change volume of the fluid chamber. Also, a reference signal indicative of a vibrating condition of the vibrating body and a residual vibration signal indicative of a residual vibration of the mounting body are generated.

Abstract: The liquid-sealing type vibration isolating apparatus of the present invention includes a coupler attached to a vibrating body, a holder, an insulator for absorbing and isolating vibration from the vibrating body at a position between the coupler and the holder, and a vibration isolating mechanism directly following the insulator and including liquid chambers sealing an incompressible fluid. This vibration isolating mechanism has a main chamber sealing a liquid, having a part of wall thereof formed by the insulator, an auxiliary chamber communicating with the main chamber via an orifice, and an equilibrium chamber provided in a portion of the main chamber via a diaphragm and having a varying volume in the chamber. The vibration isolating apparatus further includes switching means for introducing a negative pressure and the atmospheric pressure continuously or in synchronization with vibration of the vibrating body, and control means for controlling this switching operation.