A system and method for calibrating and controlling an active dampening system for a chassis of a vehicle having an engine involve operating the engine in a cylinder deactivation mode and, during the cylinder deactivation mode, (i) receiving, from a set of sensors, measured vibrations on first and second frame rails of the chassis, (ii) generating control signals for a set of actuators based on the measured vibration of the first and second frame rails, each actuator being configured to generate a vibrational force in at least one direction, and (iii) outputting, to the set of actuators, the control signals, wherein receipt of the control signals cause the set of actuators to generate vibrational forces that dampen the vibration of the first and second frame rails, respectively, to decrease noise/vibration/harshness (NVH).

Earth vibrators, such as servo-hydraulic vibrators, are improved to produce more output force and less distortion at very low frequencies by capturing mass from the vehicles which carry them, adding sufficient inertial mass to the reaction mass without adding much vehicle and equipment weight while also avoiding increases to the servo-hydraulic vibrator's stroke length. In particular, improvements to servo-hydraulic vibrators, at low frequencies, will couple some mass from the carrier vehicle frame and its load using non-rigid coupling only when additional mass is needed using dampers connected between the reaction mass and the carrier vehicle's frame, with the added damping being applied by a control system at very low frequencies of output where the vibrator is otherwise unable to produce force equal to its hold-weight.

Earth vibrators, such as servo-hydraulic vibrators, are improved to produce more output force and less distortion at very low frequencies by capturing mass from the vehicles which carry them, adding sufficient inertial mass to the reaction mass without adding much vehicle and equipment weight while also avoiding increases to the servo-hydraulic vibrator's stroke length. In particular, improvements to servo-hydraulic vibrators, at low frequencies, will couple some mass from the carrier vehicle frame and its load using non-rigid coupling only when additional mass is needed using dampers connected between the reaction mass and the carrier vehicle's frame, with the added damping being applied by a control system at very low frequencies of output where the vibrator is otherwise unable to produce force equal to its hold-weight.

A rammer includes: an engine; a reciprocating mechanism (3) including a crank shaft (13) and a connecting rod (14), and configure to convert a rotational force of the engine into a reciprocatory force; a leg part disposed in a forward inclined position in a traveling direction and configure to be moved up and down by the connecting rod (14); and a compacting plate disposed on a bottom end of the leg part. The crank shaft (13) is disposed orthogonally to the traveling direction. The reciprocating mechanism (3) includes a belt reduction mechanism (16) and a gear reduction mechanism (17).

A rammer includes: an engine; a reciprocating mechanism (3) including a crank shaft (13) and a connecting rod (14), and configure to convert a rotational force of the engine into a reciprocatory force; a leg part disposed in a forward inclined position in a traveling direction and configure to be moved up and down by the connecting rod (14); and a compacting plate disposed on a bottom end of the leg part. The crank shaft (13) is disposed orthogonally to the traveling direction. The reciprocating mechanism (3) includes a belt reduction mechanism (16) and a gear reduction mechanism (17).

A haptic actuator includes mechanical links defining a first j-trajectory and mechanical links defining a second j-trajectory as well as a motor coupled to the mechanical links so as to synchronously accelerate a first mass over the first J-trajectory and a second mass over the second J-trajectory. During a first time interval, reactive forces of the first mass accelerating substantially balance reactive forces of the second mass accelerating and during a second time interval reactive forces of the first mass accelerating do not substantially balance reactive forces of the second mass accelerating. This un-balanced condition results in a tap signal being produced.

A haptic actuator includes mechanical links defining a first j-trajectory and mechanical links defining a second j-trajectory as well as a motor coupled to the mechanical links so as to synchronously accelerate a first mass over the first J-trajectory and a second mass over the second J-trajectory. During a first time interval, reactive forces of the first mass accelerating substantially balance reactive forces of the second mass accelerating and during a second time interval reactive forces of the first mass accelerating do not substantially balance reactive forces of the second mass accelerating. This un-balanced condition results in a tap signal being produced.

Provided is a device for converting rotary motion into oscillatory axial motion, which device comprises: (a) a rotation element (1); (b) a base element (2); and (c) one or more bearings (3) for facilitating rotary motion of the rotation element relative to the base element;
wherein the rotation element and/or the base element comprise one or more raised portions (4) and/or one or more lowered portions (5) over which portions the one or more bearings (3) pass in order to periodically increase and decrease axial distance between the rotation element (1) and the base element (2) as rotation occurs, thereby imparting an oscillatory axial motion to the rotation element (1) relative to the base element (2).

Provided is a device for converting rotary motion into oscillatory axial motion, which device comprises: (a) a rotation element (1); (b) a base element (2); and (c) one or more bearings (3) for facilitating rotary motion of the rotation element relative to the base element;
wherein the rotation element and/or the base element comprise one or more raised portions (4) and/or one or more lowered portions (5) over which portions the one or more bearings (3) pass in order to periodically increase and decrease axial distance between the rotation element (1) and the base element (2) as rotation occurs, thereby imparting an oscillatory axial motion to the rotation element (1) relative to the base element (2).

A haptic actuator includes mechanical links defining a first J-trajectory and mechanical links defining a second J-trajectory as well as a motor coupled to the mechanical links so as to synchronously accelerate a first mass over the first J-trajectory and a second mass over the second J-trajectory. During a first time interval, reactive forces of the first mass accelerating substantially balance reactive forces of the second mass accelerating and during a second time interval reactive forces of the first mass accelerating do not substantially balance reactive forces of the second mass accelerating. This un-balanced condition results in a tap signal being produced.