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AssigneeMoog Inc.
InventorsKenneth D. Garnjost, Christopher A. Rauch, Gonzalo J. Rey
Estimating the term…
An actively-controlled resonant-type force generator (20) is adapted to be attached to a structure (21), and includes a mass (23) mounted for movement relative to the structure and a plurality of springs (22, 24) operatively arranged between the mass and the structure. A servoactuator (26) is arranged to controllably excite the mass-spring system. The actual force (F.sub.a) transmitted from the mass to the structure is compared with a commanded force (F.sub.c) to produce a force error signal (F.sub.e). The actuator is caused to produce a velocity as a function of the error signal. The gain of the closed force loop is selected so that the resonance of the mass-spring system has an effective damping ratio (.zeta.) greater than about 0.5, and preferably about 0.7. Thus, the mass-spring system will not be substantially resonantly excited by vibrations of the structure near its resonant frequency (.omega..sub.n).
A vibration absorber including an actively-controlled mass-spring system arranged to be resonantly excited so as to exert a vibratory reaction force on a structure, said system having a mass mounted for movement relative to said structure and having a spring arranged between said mass and structure, wherein the improvement comprises:
The method of controlling a resonant absorber having a movable mass coupled through at least one spring to a vibrating structure so as to be excited by vibrations of said structure such that when said structure vibrates at the absorber resonant frequency, the reaction force between said absorber and said structure will damp said structural vibrations, comprising the steps of:
The method of reducing externally-excited vibration at a point in a structure, comprising the steps of:
A vibration absorber adapted to be mounted on a vibrating structure at a mounting point and operable to exert a vibratory reaction force thereon in response to vibrations of said structure at said mounting point so that said structural vibration tends to be reduced, said system having a servoactuator operatively arranged to be modulated to cause the resonant frequency of said system to continuously approximate the frequency of said structural vibrations;
In an actively-controlled vibration absorber having a resonantly-vibrating mass and spring adapted to exert a vibratory reaction force on a vibrating structure at a mounting point in response to vibratory excitation from said structure, the improvement which comprises:
A vibratory inertial force generator including an actively-controlled mass-spring system arranged to be resonantly excited so as to exert a vibratory reaction force on a structure, said system having a mass mounted for movement relative to said structure and having a spring arranged between said mass and structure, wherein the improvement comprises:
A vibratory inertial force generator including an actively-controlled mass-spring system arranged to be resonantly excited so as to exert a vibratory reaction force on a structure, said system having a mass mounted for movement relative to said structure and having a spring arranged between said mass and structure, wherein the improvement comprises:
A vibratory inertial force generator including an actively-controlled mass-spring system arranged to be resonantly excited so as to exert a vibratory reaction force on a structure, said system having a mass mounted for movement relative to said structure and having a spring arranged between said mass and structure, wherein the improvement comprises:
Dependencies are inferred from the claim text.