Abstract: A device for damping vibration of a structure subject to vibration, the device including a member for clamping to the structure and having a portion engaging elastomer means for dissipating the energy of vibration. The elastomer means comprises two elastomer pads or structures concentrated at diametrically opposed locations on a circle of effort, and an inertial weight engaging and suspended by the elastomer structures. The weight is located on opposed sides of the clamping member such that the elastomer structures are sandwiched between the weight and clamping member.

Abstract: A noise-reduction device for a stationary induction apparatus which device comprises a sound insulation panel attached to reinforcing channels provided at the periphery of a tank of the stationary induction apparatus so as to block noises emitted from the outer surface of the tank, a weighty body attached to the sound insulation panel for reducing vibrations of the sound insulation panel and a dynamic damper of which the natural frequency can be adjusted to be made equal to the vibration frequency of the weighty body so as to cancel the vibrations of the weighty body.

Abstract: A bumper/energy absorber system is resiliently mounted at the body mounting location to allow the bumper/energy absorber system to vibrate freely both vertically and in pitch at its natural frequency. The mounting spring rate is selected to use the dynamic energy of the bumper/energy absorbing system to attenuate steering column vibrations excited through the vehicle body structure by the shaking forces of the engine within a predetermined speed range. The mounting is designed to minimize bumper movement relative to the body from forces directly applied to the bumper from loads such as bumper jacking.

Abstract: A vibration-damping device is disclosed for damping the vibrations between a vibration generating and a vibration receiving assembly such as is found with the casing and the handles of a chain saw. In a preferred embodiment, the chain saw casing is provided with a fitting hole having two pairs of radially projecting arcuate portions each designed for abutting engagement with radially projecting fitting members. The first fitting members are provided at the circumference of a cylinder of elastic material which is attached for the vibration receiving assembly. The second radially projecting fitting members are provided at the circumference of a head piece which mounts on the casing and holds the elastic cylinder in place.

Abstract: The invention relates to aeronautics in general, and in particular to a suspension device for helicopter, comprising a flexible mounting plate at the center of which is fixed the bottom of the main gear box whose top is supported by hinged oblique bars. The mounting plate offers radial arms hinged to the base of the bars and to the fuselage of the helicopter. These arms bear flapping weights creating forces of inertia with reactions at the attachment points of direction opposite the elastic reactions of deformation of the mounting plate. A device of this type enables the vibrations on board helicopters to be reduced.

Abstract: A static induction apparatus including a vessel for containing a main body of the static induction apparatus, a plurality of reinforcing support members secured to side plates of the vessel and a sound reducing structure. The sound reducing structure includes a plurality of sound reducing members supported between the reinforcing support members and each including a sound insulating panel composed of high damping metal plate, a resilient plate formed of thin metal sheet material interposed between the sound insulating panel and the reinforcing members, and a weight member secured to the vicinity of the boundary between the sound insulating panel and the resilient plate.

Abstract: A vibration isolation apparatus includes upper and lower, axially magnetized permanent magnets, which are disposed on a common axis and present poles of a like polarity on their opposing surfaces. The magnetic repulsion acting between the magnets maintains the upper one of them in suspension, on which is placed an instrument or member which is to be isolated from oscillations. In their central region, the magnets carry upper and lower bearing members which are disposed on the common axis and through which a connection shaft of a magnetizable material extends. The upper end of the connection shaft is provide with a flange, which is tightly fitted into a cylindrical opening formed in a threaded shank mounted on the upper magnet, thereby defining air damper to suppress a free oscillation of the upper magnet.

Abstract: An engine mounting for suspending an engine relative to a vehicle structure. The engine mounting comprises a first armature for connection to the engine and a second armature for connection to the vehicle structure and a bellows interposed between the first and second armature to define therewith a closed enclosure. The closed enclosure is filled with pressuzied gas. An inertia mass is mounted on the bellows. A mass of the inertia mass and an apparent spring constant of the bellows are selected such that the inertia mass vibrates in inverse phase relationship with the phase of vibration of the first armature when the engine operates within a vibration insulated domain.

Abstract: An engine mounting buffer rod is constructed to constitute two suspended masses interconnected by elastomeric means to endow on the rod two resonance frequencies. The resonance frequencies are selected to span the vibrational range in which resonance noise is apt to occur in the vehicle cabin so that a first change in the phase of vibration passing through the buffer rod causes an interference with the vibration passing through the main engine mounting brackets to soften the mounting arrangement as a whole and absorb vibrations which would otherwise induce cabin resonance noise. The effect of the second resonance overlaps the first to prolong the softening effect until the second phase change induced thereby occurs.

Abstract: A three-directional vibration isolator, connecting two bodies, which includes spring elements for coupling vibratory forces between the bodies and an inertia assembly for generating inertia forces to attenuate these vibratory forces. The assembly includes a drive member having one end coupled to one body to allow pivotal movement about a first assembly pivot point and an opposite end which extends axially through a tubular member and which is coupled to radially-extending, equiangularly-disposed, inertia arms to allow pivotal movement of the arms about respective first pivot axes orthogonal to the assembly axis. One end of the tubular member is coupled to the other body to allow pivotal movement about a second assembly pivot point and an opposite end thereof is coupled to the inertia arms to allow pivotal movement of the arms about respective second pivot axes parallel to the first pivot axes.

Abstract: A friction-based, motion damping assembly for a chairlift or the like is disclosed in which the damping assembly is mounted between a hub provided on a cable grip assembly and the chairlift hanger arm. The improved damping assembly is formed as a sleeve mounted to the hub of the cable grip with concentric rubber block members mounted around the sleeve. The hanger arm is formed with a collar having tapered surfaces, and an axially displaceable nut on the hub is used to wedge the rubber blocks into radial compressive engagement of the sleeve to generate the necessary compression of the sleeve about the hub for frictional damping.

Abstract: A device for absorbing kinetic energy derived from an element oscillating in a direction parallel to a longitudinal axis of the device. The device has a housing coupled to the oscillating member and defining a chamber bounded by opposite inner end walls and an inner lateral wall of the housing. The inner end walls are generally transverse to and the inner lateral wall is generally parallel with the axis of the device. An oscillation quencher body which is situated in the chamber, has opposite end faces oriented towards respective inner end walls and a lateral face oriented towards the inner lateral wall. A resiliently deformable impact member is situated between each end face of the body and a respective inner end wall of the housing. Further, at least one groove is provided in the lateral face of the body. The groove has a length generally transverse to and a width generally parallel with the device axis.

Abstract: A rubber or rubber/viscous torsional damper assembly of the type having an annular inertia mass mounted for relative torsional damping movement on an annular body portion of a rotor disk has elastic rings fixedly secured to the rotor body portion and pressing against a substantial radial width of axially inwardly facing surface area within a chamber in the inertia mass under preload compression. Annular ribs on the rings fits in annular grooves at the radially inner sides of the surface areas and substantially restrain the elastic rings against radially inward extrusion flow displacement, so that the preload compression is maintained radially outwardly relative to the ribs. Additional grooves adjacent to the radially outer sides of the surface areas receive complementary ribs on the rubber rings for controlling against radially outward rubber displacement in the viscous/rubber damper assemblies.

Abstract: This invention relates to an isolator for a large-sized static induction apparatus such as transformer and reactor. The static induction apparatus wherein a sound insulation panel is mounted through an elastic body on a reinforcing channel which is disposed on a side plate of an oil tank receiving a main device of the apparatus therein, is characterized by disposing a looped weight beam near that part of the sound insulation panel on which the elastic body is installed.With such construction, noise can be effectively reduced while imparting a satisfactory supporting strength to the mounting part of the sound insulation panel.

Abstract: Tuned rubber/viscous torsional vibration damper assemblies of the kind having a supporting rotor disk mounting an inertia mass coupled to the disk by viscous damping medium and elastic tuning spring, spacing and sealing rubber rings located in rubber ring accommodating grooves. A viscous damping medium working chamber is defined within the inertia mass radially outwardly about the rings. The rubber rings are molded and vulcanized in situ in said grooves and to the rotor disk and the inertia mass. The dampers may be provided with rubber spacer and bumper fingers extending from the rubber rings into the working chamber of the damper. The rubber rings may also be keyed to the inertia mass by means of integral lugs extending into socket apertures in the inertia mass. The dampers may be coated with a rubber skin on outside areas, the skin being connected to exposed areas of the rubber rings.

Abstract: A mounting for a helicopter pylon having a plurality of resilient vertical support links (24-27) between the pylon (12) and the helicopter fuselage (13). The links have a composite spring rate for a given pylon weight which establishes a resilient support for the fuselage from the pylon at the thrust required to support said fuselage in normal flight and in which oscillatory vertical force transmitted to fuselage is minimal for acceptable static deflections of the pylon.Physical stops (24e, 24n, 24p) are operable to limit deflection between the pylon (12) and the fuselage (13) at predetermined rotor thrust above and below said normal thrust.Links (24-27) are mounted at the ends of a pair of rigid beams (20, 21 and 22, 23) which are secured at the centers thereof to opposite sides of transmission portion of the pylon (12).A vertical rigid mounting pin (24b) extends downward at the end of each beam.

Abstract: A suspension system for a linear reciprocating machine incorporates dynamic vibration isolation means into a mass flow system of the machine. An antiphase mass movement results in an essentially zero transmissibility of machine vibration to an outer casing enclosing the machine.

Abstract: A vibration absorbing track wheel having one or more different natural frequencies. The wheel body has a wheel flange with one or more resonance absorbers on the wheel flange. Each resonance absorber comprises at least two tongues and an intermediate layer of damping material between each of the two adjacent tongues, and each tongue is turned to a different natural frequency of the wheel.

Abstract: A vibration isolator utilizes a force of magnetic repulsion which is produced by a pair of permanent magnets disposed so that poles of a like polarity oppose to each other. The vibration isolator includes an upper and a lower, annular magnet assembly which are axially magnetized and which are disposed coaxially on a common axis so that their opposing surfaces present poles of a like polarity. The respective magnet assemblies are covered, except for the opposing surfaces, by yoke members of a magnetizable material, whereby a magnetic flux is concentrated across the opposing surfaces of the magnetic assemblies to produce an increased force of magnetic repulsion therebetween. Bearing sleeves are disposed in the central region of each of the magnet assemblies. A connecting shaft has its opposite ends loosely fitted in the respective bearing sleeves, whereby one of the magnet assemblies is coupled to the other so as to be axially movable independently from each other.