A vibration attenuator is configured for use on an aircraft rotor rotatable about a mast axis and has upper and lower weight assemblies, each comprising a weight with a center of gravity being a radial distance from the mast axis. The weight assemblies are configured for rotation together relative to the rotor at a selected angular rate about the mast axis, the weights being located on opposing sides of the mast axis. A first motor is configured for selective translation of one of the weight assemblies relative to the other weight assembly along the mast axis between a minimum-moment configuration, in which the centers of gravity of the weights revolve about the mast axis in the same plane, and a maximum-moment configuration, in which the centers of gravity of the weights revolve about the mast axis in different planes for producing a whirling moment about the mast axis.

The present invention relates to a device for generating vibrations for a ground compaction machine, in particular a self-propelled ground compaction roller, comprising a first imbalance mass and a second imbalance mass, each of which is rotatably mounted, a first hydraulic motor configured to set the first imbalance mass into rotation, a planetary gear connected to the first hydraulic motor and via which the second imbalance mass can be driven, a second hydraulic motor which is also connected to the planetary gear and is configured to change the transmission ratio from the first hydraulic motor to the second imbalance mass via the planetary gear, wherein a third hydraulic motor is provided which is also connected to the planetary gear and is also configured to change the transmission ratio from the first hydraulic motor to the second imbalance mass via the planetary gear. Moreover, the present invention relates to a ground compaction machine and a method for operating the device and the ground compaction machine, respectively.

An adjustable mass eccentric for a multi-amplitude vibratory mechanism can comprise a body and an internal cavity defined by the body such that the body surrounds the internal cavity. The internal cavity can include a first section, a second section, and a third section between the first section and the second section. The third section can define a volume and/or an area less than respective volumes and/or areas of the first section and the second section of the internal cavity. Filler material may be provided in the internal cavity and can migrate to and from the first, second, and third sections based on rotational movement of the body and internal cavity.

An adjustable mass eccentric for a multi-amplitude vibratory mechanism can comprise a body and an internal cavity defined by the body such that the body surrounds the internal cavity. The internal cavity can include a first section, a second section, and a third section between the first section and the second section. The third section can define a volume and/or an area less than respective volumes and/or areas of the first section and the second section of the internal cavity. Filler material may be provided in the internal cavity and can migrate to and from the first, second, and third sections based on rotational movement of the body and internal cavity.

Improvements in a device for locating a manifold is disclosed. The vibrating manifold locator has a head that produces an audible and physical vibration onto a manifold when the head contacts the manifold. A plumber can simply listen for the sound and can audibly follow the sound to determine the location of the manifold. An elongated feeding line is sufficiently ridged so the vibrating head can be pushed into and through a plumbing line. The device is battery power provides the ability to insulate the plumber from hazardous electricity as they feed the head into water. An eccentrically weighted motor creates a vibration at the tip of the head so when the head contacts the manifold or the sides of the head rubs against the plumbing tubing the vibration can be heard or felt.

A soil compactor includes two compactor rollers arranged at a distance from one another in the direction of a longitudinal axis of the soil compactor and rotatable around a respective roller axis of rotation, each compactor roller is operable in an oscillatory compaction mode in which the vibration excitation arrangement assigned to a respective compactor roller is operated in the oscillatory vibration excitation mode, in a vibratory compaction mode in which the vibration excitation arrangement assigned to a respective compactor roller is operated in the vibratory vibration excitation mode, and in a static compaction mode in which the vibration excitation arrangement is deactivated. When the soil compactor is moved in a plurality of successive compactor passes over soil to be compacted with alternating movement of the soil compactor essentially in the first movement direction and essentially in the second movement direction, during at least one pass, the trailing compactor roller is not operated in the vibratory compaction mode.

A soil compactor includes two compactor rollers arranged at a distance from one another in the direction of a longitudinal axis of the soil compactor and rotatable around a respective roller axis of rotation, each compactor roller is operable in an oscillatory compaction mode in which the vibration excitation arrangement assigned to a respective compactor roller is operated in the oscillatory vibration excitation mode, in a vibratory compaction mode in which the vibration excitation arrangement assigned to a respective compactor roller is operated in the vibratory vibration excitation mode, and in a static compaction mode in which the vibration excitation arrangement is deactivated. When the soil compactor is moved in a plurality of successive compactor passes over soil to be compacted with alternating movement of the soil compactor essentially in the first movement direction and essentially in the second movement direction, during at least one pass, the trailing compactor roller is not operated in the vibratory compaction mode.

The invention relates to a detection system in a screening device for screening material, e.g. aggregate, ore or similar, comprising at least one screening decks, the at least one screening deck having a screening surface comprising one or more screening modules. The system comprises a sensor arranged at or near at least one screening deck of the screening device. The sensor is arranged such that it can detect objects present leaving the at least one screening deck. The invention also relates to a method for detection of objects in a screening device, and use of the detection system.

The invention relates to a detection system in a screening device for screening material, e.g. aggregate, ore or similar, comprising at least one screening decks, the at least one screening deck having a screening surface comprising one or more screening modules. The system comprises a sensor arranged at or near at least one screening deck of the screening device. The sensor is arranged such that it can detect objects present leaving the at least one screening deck. The invention also relates to a method for detection of objects in a screening device, and use of the detection system.

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.