Inertia force generating device
AssigneeBarry Wright Corporation
InventorsWilliam S. Jensen, David Ng
Life of this patent
Estimating the term…
Abstract
An inertia force generating device comprises two pairs of coaxial counterrotating eccentric rotors, whose rotational speeds and relative positons are automatically and continuously controlled so as to cancel undesirable vibrations produced by another device. Within each rotor pair, the two rotors have an adjustable angle between their mass centers, so that the effective eccentricity of the pair can be varied, and the phase between the two pairs can also be changed, to alter the direction of the maximum or minimum inertial forces developed. The four rotors include shells of different diameter, nested together on a center plane of the device, or parallel plates configured to maintain a minimum spread of mass centers along the rotational axis.
Claims17
An inertial force generating device for producing periodic forces to cancel undesired vibrations, comprising:
- a stationary housing;
- first and second pairs of eccentric rotors disposed within said housing for rotation around an axis common to all of said rotors, each rotor having an imbalanced portion with a respective eccentric center of mass, said imbalanced portions being nested radially, so as to develop force vectors in a common plane perpendicular to said axis;
- means for rotating said rotor pairs in opposite directions;
- means for controlling the angle between the mass centers of the rotors within each rotor pair, so as to vary an effective mass eccentricity of each;
- and
- means for adjusting the phase angle between the rotor pairs so as to control the direction of the cancelling force generated by the device.
An inertial force generating device for producing periodic forces to cancel undesired vibrations, comprising:
- a stationary housing;
- first and second pairs of eccentric rotors disposed within said housing for rotation around an axis common to all of said rotors, each rotor having an imbalanced portion with a respective eccentric center of mass, said imbalanced portions being nested radially, so as to develop force vectors in a common plane perpendicular to said axis;
- means for rotating said rotor pairs in opposite directions;
- and
- means for controlling the angle between the mass centers of the rotors within each rotor pair, so as to vary an effective mass eccentricity of each of said pairs;
- wherein;
- all of said rotors have substantially identical mass eccentricity;
- and
- each of said imbalanced portions comprises an unbalanced shell, said shells being concentric and out of contact with one another, so as to be independently rotatable.
An inertia force generating device for producing periodic forces to cancel undesired vibrations, comprising:
- a stationary housing;
- first and second pairs of eccentric rotors disposed within said housing for rotation around an axis common to all of said rotors, each rotor having an imbalanced portion with a respective eccentric center of mass, said imbalanced portions being nested radially, so as to develop force vectors in a common plane perpendicular to said axis;
- means for rotating said rotor pairs in opposite directions;
- means for controlling the angle between the mass centers of the rotors within each rotor pair, so as to vary an effective mass eccentricity of each of said pairs;
- and
- a shaft supported within said housing and extending along said common axis, each of said rotor pairs comprising an inner and an outer rotor, the inner rotor of each pair being supported by bearings on the shaft, and the outer rotor of each pair being supported by bearings on said housing.
An inertia force generating device for producing periodic forces to cancel undesired vibrations, comprising:
- a stationary housing;
- first and second paris of eccentric rotors disposed within said housing for rotation around an axis common to all of said rotors, each rotor having an imbalanced portion with respective eccentric center of mass, said imbalanced portions being nested radially, so as to develop force vectors in a common plane perpendicular to said axis;
- means for rotating said rotor pairs in opposite directions;
- means for controlling the angle between the mass centers of the rotors within each rotor pair, so as to vary an effective mass eccentricity of each of said pairs;
- wherein each of said rotors is provided with a series of circumferenctially spaced markings, and further comprising two pairs of sensors mounted upon the housing, one for each of said rotors, for sensing said markings as they pass by the sensors.
An inertial force generating device for producing periodic forces to cancel undesired vibrations, comprising
- a stationary housing,
- first and second pairs of eccentric rotors disposed within said housing for rotation around an axis common to all of said rotors, each rotor having an eccentric center of mass,
- means for rotating said rotor pairs in opposite directions,
- means for controlling the angle between the mass centers of the rotors within each rotor pair, so as to vary an effective mass eccentricity of each of said pairs, and
- means for adjusting the phase angle between the rotor pairs so as to control the direction of the force generating by the device, and
- wherein the rotors comprise closely adjacent respective plates each perpendicular to said axis, so as to develop force vectors nearly within a central plane perpendicular to said axis.
A method of cancelling an undesired periodic vibration of determinable magnitude, frequency and direction, comprising the steps of
- providing a force cancelling device with two paris of independently rotatable eccentrically weighted rotors, each rotor having an eccentric center of mass,
- rotating said rotors about a common axis in synchronization with one another, while controlling their speed as a function of the frequency of the undesired vibration,
- adjusting the angle between the mass centers of the two rotors in each pair, so as to control the amplitude of the inertial force generated by the device, as a function of the magnitude of the undesired vibration,
- adjusting the phase angle between the two rotor pairs so as to control the direction of the cancelling force generated by the device, as a function of the direction of the undesired vibration, and
- adjusting the phase of the device with respect to that of the undesired vibration, so as to oppose and cancel said vibration.
Dependencies are inferred from the claim text.