An isolator for a stationary vibration isolation system, which is effective in the horizontal and vertical directions, the isolator comprising at least one pneumatic actuator.

A bottomhole assembly includes: a drill bit operable to vibrate when engaged with a formation and rotated; and a suspension sub including: a stator barrel for connection to a pipe string; a traveler barrel for connection to the drill bit; a slip joint longitudinally coupling the traveler barrel to the stator barrel while allowing movement of the traveler barrel between an extended position and a retracted position; a torsional joint connecting the traveler barrel to the stator barrel at and between the positions; and one or more springs disposed between the stator barrel and the traveler barrel. The suspension is tuned relative to the drill bit to: dampen the vibration of the drill bit when the BHA is rotated at a first angular velocity; and resonate the vibration of the drill bit when the BHA is rotated at a second angular velocity, thereby imparting percussive energy to the drill bit.

An electromagnetic actuator including: an inner axial member; an outer housing member; a stator and a mover configured to have electromagnetic oscillation force exerted between them, each being securely assembled to different one of the members; and plate springs elastically connecting the members at opposite axial sides thereof, wherein the outer housing member includes an outer tubular member and first and second lid members attached to opposite axial openings thereof, and a first axial side of the outer tubular member has a small-diameter constricted section, and the constricted section has axially inner and outer stepped walls, and the axially inner stepped wall positions a first axial side of the stator or the mover assembled to the outer housing member, while the axially outer stepped wall and the first lid member support a periphery of the corresponding plate spring.

The invention relates to an industrial truck comprising a mast (8), a load-carrying apparatus (36), which can be moved upwards and downwards thereon and which has at least one load-receiving means for receiving a load that is to be transported, and a support structure (24) connecting the load-receiving means to the mast (8), the load receiving means having a load-carrying arrangement (41) connected to the support structure (24), and a device for reducing vibrations, characterised in that the device for reducing vibrations has at least one load support (50), which covers the load-carrying arrangement (41) at the top at least in regions, on which support a load received by the load-carrying apparatus (36) can be supported and which support is provided so as to be movable to a limited extent on the load-carrying arrangement (41) such that it can perform vibration-reducing movements relative to the load-carrying arrangement (41).

A device for connecting the elastic elements and dissipaters of variable type of a mechanical suspension interposed between two vibrating or tilting mechanical systems, the source body and the receiving body, respectively, in order to reduce the forces acting on the receiving body, and/or the displacement thereof, and/or the speed thereof, or combinations of the previous physical magnitudes and/or of any other ones, which are produced on the receiving body due to the motion or forces to which the source is subjected. The device consists of elastic elements, such as metal components or compressed gases, energy dissipating elements, either by means of friction between fluid and solid, and between solid and solid, or by means of suitable electromagnetic couplings the damping ability of which can be automatically varied by a suitable control system according to the operating conditions of the suspension; elements forming the kinematic connection structure between the elastic elements, damping elements, source and receiving bodies, such connections being solid or fluid or electromagnetic connections.

Provided is an active engine mount having a vent hole that includes a damper assembly including an exciter. The damper assembly in the active engine mount which controls pressure of a main chamber as the exciter is excited has a vent hole that enables communication from a lower part of the exciter to the outside formed thereon such that air inside the damper assembly can be discharged to the outside.

An arrangement and method for maintaining an alignment of an internal combustion engine by utilizing an arrangement includes a number of fluid springs by means of which the engine is mounted on a foundation thereof, control valves arranged in communication with each fluid spring, at least three position sensors in communication with the engine, and an electronic control unit. The electric control unit is provided with preset engine position values. The method includes collecting engine position information to the electric control unit, comparing the position information to preset position values, determining, if the position information differs from the preset position values, such control valves that need to be operated, calculating the corrective measures, and giving corrective instructions to the control valves.

An arrangement and method for maintaining an alignment of an internal combustion engine by utilizing an arrangement includes a number of fluid springs by means of which the engine is mounted on a foundation thereof, control valves arranged in communication with each fluid spring, at least three position sensors in communication with the engine, and an electronic control unit. The electric control unit is provided with preset engine position values. The method includes collecting engine position information to the electric control unit, comparing the position information to preset position values, determining, if the position information differs from the preset position values, such control valves that need to be operated, calculating the corrective measures, and giving corrective instructions to the control valves.

A suspension device includes a damper having an extension-side chamber and a contraction-side chamber, an air spring that exerts a resilient force in a direction in which the damper is extended, and a control part that independently adjusts the pressures of the extension-side chamber and the contraction-side chamber to control a force exerted by the damper. The control part makes the damper exert a balancing force against the resilient force of the air spring in a predetermined stroke range of the air spring.

A tunable vibration isolator with active tuning elements having a housing, fluid chamber, and at least one tuning port. A piston is resiliently disposed within the housing. A vibration isolation fluid is disposed within the fluid chambers and the tuning ports. The tunable vibration isolator may employ either a solid tuning mass approach or a liquid tuning mass approach. The active vibration elements are preferably solid-state actuators.