Resonant inertial force generator having stable natural frequency
OwnerAskari Badre-Alam, Michael D. Janowskiinventors
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Abstract
A resonant inertial force generator for controlling vibrations of a structure includes a compliant spring comprising a stack of flexures and elastomeric shims in alternating arrangement, a driven inertial mass coupled to the compliant spring to generate a vibration controlling force.
Claims28
A resonant inertial force generator for controlling vibrations of a structure, comprising:
- a compliant spring comprising a stack of flexures and elastomeric shims in alternating arrangement;
- an inertial mass coupled to the compliant spring;
- and
- an actuator for moving said inertial mass.
A resonant inertial force generator, comprising:
- an inertial mass supported by a plurality of flexures;
- and
- a plurality of intermediate elastomeric shims interleaved with said plurality of flexures.
A compliant spring, comprising:
- a plurality of composite flexure plates layered in a stack;
- and
- an elastomeric shim disposed between each adjacent pair of the composite flexure plates.
A method of making an inertial force generator, comprising:
- providing an inertial mass;
- providing n composite flexures, wherein n is an integer and is greater than 1;
- providing at least n+1 elastomeric shims;
- interleaving the at least n+1 elastomeric shims with the n composite flexures to form a compliant spring comprising an alternating arrangement of flexures and elastomeric shims;
- coupling said inertial mass to the compliant spring;
- and
- coupling to the inertial mass an actuator capable of moving the inertial mass.
A method of making an inertial force generator, comprising:
- providing an inertial mass;
- providing a plurality composite flexures;
- providing a plurality of elastomeric shims;
- stacking the composite flexures and elastomeric shims alternately to form a compliant spring, the elastomeric shims being arranged adjacent to load bearing areas of the composite flexures;
- coupling said inertial mass to said compliant spring;
- and
- coupling to the inertial mass an actuator capable of moving the inertial mass.
A method of making an inertial force generator spring, comprising:
- providing a plurality of composite flexure plates;
- providing an intermediate elastomer;
- layering said composite flexure plates with said intermediate elastomer between said composite flexure plates to provide a spring assembly of layered composite flexure plates and intermediate elastomer between adjacent composite flexure plates, with said intermediate elastomer bonded to said composite flexure plates.
A resonant inertial force generator, comprising:
- an inertial mass supported by a plurality of composite flexures arranged in a stack;
- and
- compliant means for separating said composite flexures.
A resonant inertial force generator for controlling vibrations, comprising:
- an inertial mass on a spring assembly;
- a motor for moving said inertial mass on said spring assembly, said spring assembly including at least a first non-elastomeric flexure and at least a first intermediate elastomer, said intermediate elastomer bonded with said first non-elastomeric flexure.
An apparatus for controlling aircraft vibrations, comprising:
- an inertial mass on a spring assembly having a natural frequency NF, an electrically driven motor for moving said inertial mass on said spring assembly, said spring assembly including at least a first composite flexure and a means for inhibiting a decay in said natural frequency NF.
An apparatus for controlling aircraft vibrations, comprising:
- a driven inertial mass on a spring assembly having a natural frequency NF with the spring assembly including a plurality of nonhomogeneous composite flexures having first ends and distal second ends with a plurality of elastomeric spacers bonded between the composite flexures proximate the first ends and the distal second ends.
Dependencies are inferred from the claim text.