EP0409462A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Inertia force generating device
Assignee: Hutchinson Aerospace and Industry Inc
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Filing: 1990-07-09
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Granted: —
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Expires: 2010-07-09
Abstract
Abstract An inertia force generating device comprises two pairs of coaxial counter-rotating eccentric rotors (12, 14, 16 and 18), whose rotational speeds and relative positions 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 ecentricity 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 (52, 54, 56 and 58) of different diameter, nested together on a center plane of the device.
Inventors
- 👤 William S. Jenson
- 👤 David Ng
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 07:02
CPC Classifications
G; G05; G05D; G05D19/00; G05D19/02; F; F16; F16F; F16F15/00; F16F15/22; B; B64; B64C; B64C27/00; B64C27/001; B64C2027/004; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18344; Y10T74/18544; Y10T74/18552; Y10T74/21; Y10T74/211; Y10T74/2111; Y10T74/2112
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
An inertial force generating device for producing forces to cancel undesired vibrations comprising a stationary housing, first and second pairs of eccentrically weighted rotors disposed within the housing for rotation about an axis common to all the rotors, means for rotating the rotors in opposite directions and means for controlling the angle between the mass centres of the two eccentrics within each of the pairs, wherein the rotors include imbalanced portions.
Claim 2
Dependent Claim
71 words
An inertial force generating device for producing forces to cancel undesired vibrations comprising a stationary housing, first and second pairs of eccentrically weighted rotors disposed within the housing for rotation about an axis common to all the rotors, means for rotating the rotors in opposite directions and means for controlling the angle between the mass centres of the two eccentrics within each of the pairs, wherein the rotors include imbalanced portions.
Claim 3
Dependent Claim
55 words
A device as claimed in claim 1, wherein said imbalanced portions are nested radially, so as to develop force vectors in a common plane perpendicular to said axis; and further comprising means for adjusting the phase angle between the rotor pairs so as to control the direction of the cancelling force generated by the device.
Claim 4
Dependent Claim
19 words
A device as claimed in claim 1 or 2, wherein all of said rotors have substantially identical mass eccentricity.
Claim 5
Dependent Claim
34 words
A device as claimed in claim 3, wherein 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.
Claim 6
Dependent Claim
25 words
A device as claimed in claim 4, wherein the rotating means comprise plural motors, each motor being connected to a respective one of said rotors.
Claim 7
Dependent Claim
20 words
A device as claimed in claim 5, wherein all of said motors rotate said rotors at the same absolute speed.
Claim 8
Dependent Claim
44 words
A device as claimed in claim 6, wherein each of said shells has a primary plane in which its center of mass lies, and further comprising means for varying the angular offset between the primary planes of the rotors within each of said pairs.
Claim 9
Dependent Claim
43 words
A device as claimed in claim 6, wherein the means for controlling the angle between the mass centers of the rotors within each rotor pair maintains a different offset in each rotor pair for the generation of eccentric forces of constantly varying magnitude.
Claim 10
Dependent Claim
62 words
A device as claimed in claim 1 or 2, further comprising a shaft supported within said housing and extending along said common axis, each of said rotors 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.
Claim 11
Dependent Claim
34 words
A device as claimed in claim 9, wherein the means for controlling the angle between the mass centers of the rotors within each rotor pair maintains substantially identical angular offsets in both rotor pairs.
Claim 12
Dependent Claim
25 words
A devise as claimed in anyone of claims 1 to 10, further comprising an accelerometer for measuring magnitude, direction and frequency of the undesired vibrations.
Claim 13
Dependent Claim
87 words
A device as claimed in claim 11, further comprising two pairs of sensors mounted upon the housing, one sensor for each of said rotors, for sensing circumferentially spaced markings on said rotors; means responsive to said sensors for determining the angular speed and position of each of said rotors; and means responsive to both said determining means and said accelerometer, for controlling said rotating means, said controlling means comprising means for adjusting the speed, offset and phase of the rotors so as to cancel the undesired vibrations.
Claim 14
Independent Claim
31 words
A device as claimed in any one of claims 1 to 12, further comprising means responsive to said sensors for determining the angular speed and position of each of said rotors.
Claim 15
Independent Claim
31 words
A device as claimed in any one of claims 1 to 12, further comprising means for varying a point alignment of the effective centers of mass of the two rotor pairs.
Claim 16
Dependent Claim
35 words
A device as claimed in claim 1, 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.
Claim 17
Dependent Claim
33 words
A device as claimed in claim 15, further comprising means for adjusting the phase of the device with respect to that of the undesired vibration, so as to oppose and cancel the vibration.
Claim 18
Independent Claim
160 words
A method of cancelling and undesired periodic vibration of determinable magnitude, frequency and direction, comprising the steps of, providing a force cancelling device with two pairs 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.
Claim 19
Independent Claim
160 words
A method of cancelling and undesired periodic vibration of determinable magnitude, frequency and direction, comprising the steps of, providing a force cancelling device with two pairs 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.
References Cited (Backward Citations)
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