An eccentric assembly for a compaction machine may include an outer eccentric mass and first and second inner eccentric masses. A length of the outer eccentric mass is in a direction of an axis of rotation of the outer eccentric mass. The first inner eccentric mass is rotatably connected to the outer eccentric mass by a first joint, and the second inner eccentric mass is rotatably connected to the outer eccentric mass by a second joint. Moreover, the first and second inner eccentric masses are separate, and the first and second joints are separate. Related compaction machines are also discussed.

An electronic apparatus is configured to generate a variety of vibrations corresponding to a variety of different situations without excessively high power consumption. The electronic apparatus has first and second vibration motors having respective eccentric weights different in weight from each other for generating different first and second vibrations. An input/output section enables a user to select from a list of events stored in a storage section first events and second events. A controller drives the first vibration motor having a heavier weight with a strong vibration upon occurrence of the user-selected first events and drives the second vibration motor having a lighter weight with a weak vibration upon occurrence of the user-selected second events. The first events include an incoming phone call or email, a present alarm time, and a dynamic or important action, motion, and so on in a computer game. The second events include confirming input operations by the user, and a minute action, motion, and so on occurring in a computer game. The correspondence between the vibration motors and the events is selectable by the user.

A tamping unit for tamping a track has tamping tines which are designed for immersion into a ballast bed and which can be set in vibrations by a vibration drive. The vibration drive includes a housing in which a shaft including an eccentric is arranged for rotation about a shaft axis. A transmission element for transmitting a vibratory motion is mounted on the eccentric. The eccentric is connected to the shaft in a rotation-locked and radially displaceable manner, wherein the position of the eccentric relative to the shaft is adjustable in radial direction by an adjustment device. Thus, while retaining the advantages of an eccentric drive, it is possible to adjust vibration parameters during operation.

A vibration device for generating various vibration signatures or characteristics is provided. This various vibration signatures or characteristics allow a single vibration device to be used to test and replicate failures in a subject device across a broad range of vibration signatures or characteristics transferring to the subject device. The vibration devices includes a pair of spaced-apart plates, each defining a slot therein. An adjustable fastener connects the upper and lower plates and extends through the upper and lower elongated slots. A vibrator is fastened to the upper plate via the upper elongated slot. To enable the vibration signatures or characteristics to be varied, the fastener is adjustable in a vertical direction to alter the distance between the lower plate and the upper plate, and is adjustable in a horizontal direction along the upper and lower slots. The motor can also translate along the upper elongated slot.

There is provided a vibration generation device superior in responsivity compared to the related art. The vibration generation device includes a stator, a rotor provided to the stator so as to be able to rotate around the central axis, and having a weight having a gravity center at a position shifted from the central axis, and an air resistance reduction part provided to the weight, and reducing the air resistance to the weight when the rotor rotates. The weight is formed to have a semicircular shape viewed from the axial direction, and the air resistance reduction part has an arcuate part adapted to connect an end edge on the upstream side in the rotational direction of the rotor in the outer circumferential surface of the weight and an end edge on the downstream side in the rotational direction to each other so as to form a circular arc shape.

A vibration device for generating various vibration signatures or characteristics is provided. This various vibration signatures or characteristics allow a single vibration device to be used to test and replicate failures in a subject device across a broad range of vibration signatures or characteristics transferring to the subject device. The vibration devices includes a pair of spaced-apart plates, each defining a slot therein. An adjustable fastener connects the upper and lower plates and extends through the upper and lower elongated slots. A vibrator is fastened to the upper plate via the upper elongated slot. To enable the vibration signatures or characteristics to be varied, the fastener is adjustable in a vertical direction to alter the distance between the lower plate and the upper plate, and is adjustable in a horizontal direction along the upper and lower slots. The motor can also translate along the upper elongated slot.

A depth vibrator for compacting soil, comprising a rotary drive (3); a drive shaft (4), which is rotatingly drivable about a rotary axis (A) by the rotary drive (3) in a first rotation direction (R1) and in an opposite second rotation direction (R2); a primary mass body (5) connected non-rotatably to the drive shaft (4) and rotates together with the latter about the rotary axis (A); a secondary mass body (6), which is movable into a first rotation position (P1) relative to the primary mass body (5) by rotation of the drive shaft (4) in the first rotation direction (R1) and which is movable into a second rotation position (P2) by rotation of the drive shaft (4) in the second rotation direction (R2). In the first and second rotation position (P1) the secondary mass body (6) can be rotated together with the primary mass body (5) about the rotary axis (A); and the center of mass (S6) of the secondary mass body (6) and the center of mass (S5) of the primary mass body (5) have different radial distances from the rotary axis (A).

A strut mount including: a first mounting member configured to be attached to a shock absorber; a second mounting member configured to be attached to a vehicle body; a main rubber elastic body elastically connecting the first and second mounting members to each other; a fluid-filled zone whose interior is filled with a non-compressible fluid such that a vibration damping effect is obtained based on a flow action of the fluid; and an orifice passage through which the fluid filled in the fluid-filled zone is induced to flow. A tuning frequency of the orifice passage is set to a frequency of a vibration transmitted during lockup of an automobile from a drive train of the automobile to the vehicle body via the shock absorber.

A vibration attenuator for a rotor is rotatable about a mast axis and has a frame configured for rotation about the mast axis relative to the rotor. A first mass is axially translatable in a first direction relative to the frame parallel to a first axis, and a first biasing force urges the first mass toward a first-mass rest position in which the first mass is symmetric about the mast axis. A second mass is axially translatable in a second direction relative to the frame parallel to a second axis, and a second biasing force urges the second mass toward a second-mass rest position in which the second mass is symmetric about the mast axis. A selected first or second mass moves radially outward from the rest position to oppose vibrations in the rotor.

A method for detecting and controlling compaction when compacting a soil by a depth vibrator which has a rotationally drivable imbalance (3) and at least one sensor (6, 12, 13, 14, 19), comprising the steps of: inserting the depth vibrator (2) into the soil (17) up to a desired final depth (Tm); compaction of the soil (17) during which the forward angle () of the imbalance (3) as well as the oscillation amplitude (A) of the depth vibrator (2) are determined; detection of a soil stiffness profile from soil stiffness values (k) determined over time (t); determination of a first soil stiffness value (k1) and a second soil stiffness value (k2) from the soil stiffness profile (k), for which it applies that a rate of increase (k2) of the second soil stiffness value (k2) exceeds a rate of increase (k1) of the first soil stiffness value (k1) by a defined factor; calculation of a transition soil stiffness value (k12) which is between the first soil stiffness value (k1) and the second soil stiffness value (k2); and storing the transition soil stiffness value (k12) detected in the respective compaction step to the associated depth (T).