A vibration suppression unit for an aircraft comprising a vibration control frame adapted to be mounted to the aircraft and to rotate about a central axis, a first motor configured to rotate the vibration control frame about the central axis, a second motor configured to rotate a first and second center of mass about a first and second axis or rotation, a third motor configured to adjust a variable distance between the first and second centers of mass and the first and second axis of rotation, respectively, and a controller for receiving input signals and outputting command signals to the first, second and third motors.

A method for controlling an elastic mount configured to support a propulsion device with respect to a marine vessel, wherein the elastic mount contains an electromagnetic fluid and an electromagnet and is configured such that adjusting an amount of electricity applied to the electromagnet changes the shear strength of the electromagnetic fluid and thereby controls elasticity of the elastic mount, including applying a first amount of electricity to the electromagnet to produce a first elasticity in the elastic mount, determining that a vessel speed indicator exceeds a high speed threshold, determining that a trim position for the propulsion device is greater than a threshold trim position, detecting at least a threshold decrease in throttle demand, and applying a second amount of electricity to the electromagnet wherein the second amount of electricity is greater than the first amount of electricity, so as to decrease the elasticity of the elastic mount.

A method for controlling an elastic mount configured to support a propulsion device with respect to a marine vessel, wherein the elastic mount contains an electromagnetic fluid and an electromagnet and is configured such that adjusting an amount of electricity applied to the electromagnet changes a shear strength of the electromagnetic fluid in the elastic mount and thereby controls an elasticity of the elastic mount. The method includes applying a first amount of electricity to the electromagnet to produce an initial elasticity of the elastic mount measuring an oscillation of the propulsion device with a motion sensor, determining that the oscillation of the propulsion device exceeds a threshold oscillation, and adjusting the amount of electricity applied to the electromagnet to change the elasticity of the elastic mount to reduce the oscillation.

The present disclosure relates to a boat drive for driving a boat, comprising a drive unit comprising an electric motor and a mounting connected to the drive unit for connecting the boat drive to the boat, wherein the mounting is provided for distancing the drive unit from a hull of the boat, wherein a decoupling arrangement for decoupling of oscillations (S) generated in the drive unit is arranged between the drive unit and the mounting.

A system comprises an elastic mount configured to support a propulsion device with respect to a marine vessel. The elastic mount contains an electromagnetic fluid. An electromagnet is configured so that increasing an amount of electricity applied to the electromagnet increases the shear strength of the electromagnetic fluid in the elastic mount and thereby decreases elasticity of the elastic mount, and so that decreasing the amount of electricity applied to the electromagnet decreases the shear strength of the electromagnetic fluid in the elastic mount and thereby increases the elasticity of the elastic mount. A controller automatically adapts the amount of electricity applied to the electromagnet based on one or more sensed conditions so as to improve performance and/or handling of the marine vessel.

A vibration suppression unit for an aircraft comprising a vibration control frame adapted to be mounted to the aircraft and to rotate about a central axis, a first motor configured to rotate the vibration control frame about the central axis, a second motor configured to rotate a first and second center of mass about a first and second axis or rotation, a third motor configured to adjust a variable distance between the first and second centers of mass and the first and second axis of rotation, respectively, and a controller for receiving input signals and outputting command signals to the first, second and third motors.

The present disclosure relates to a boat drive for driving a boat, comprising a drive unit comprising an electric motor and a mounting connected to the drive unit for connecting the boat drive to the boat, wherein the mounting is provided for distancing the drive unit from a hull of the boat, wherein a decoupling arrangement for decoupling of oscillations (S) generated in the drive unit is arranged between the drive unit and the mounting.

A trolling motor assembly having improved shock absorption is provided. The trolling motor assembly includes a trolling motor, a first member, a second member, an actuator that is configured to be activated to cause the trolling motor to move between a first position and a second position, and a compliant member connected to the actuator. When the trolling motor is in a first position, the first member dampens shock loading at the actuator or transfers shock loading to a first shock absorber to dampen shock loading. When the trolling motor is in a second position, the second member dampens shock loading at the actuator or transfers shock loading to at least one of the first shock absorber or a second shock absorber to dampen shock loading. The compliant member dampens shock loading to protect the actuator from shock loading as the trolling motor moves between the first and second position.

A system for controlling trim position of a marine propulsion device on a marine vessel includes a trim actuator having a first end configured to couple to the marine propulsion device and a second end configured to couple to the marine vessel. A controller controls position of the trim actuator between an extended position wherein the propulsion device is trimmed up with respect to the vessel and a retracted position wherein the propulsion device is trimmed down with respect to the vessel. A shock relief mechanism overrides position control by the controller and allows extension of the trim actuator upon the occurrence of an overpressure event. An arresting mechanism, when activated, prevents extension of the trim actuator beyond a certain limit. The controller selectively activates the arresting mechanism in response to a determination that the propulsion device is being commanded in reverse. Methods for controlling trim position are also included.

A method of reducing vibration in a rotary system (120, 130, 140) of a watercraft, for example a cargo ship (100), comprising balancing said rotary system (120, 130, 140), characterized by providing a rotational element (300, 302-306) comprising a chamber (310-312) having a fulcrum on a rotational axis (340) of said rotational element (300, 302-306), comprising a circumferential balancing area (320) and being partially filled with an amount of a thixotropic balancing substance (330). A corresponding apparatus and system.