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US 9,810,279 B2Granted
Vibratory bandgap device
AssigneeNorthrop Grumman Systems Corporation
InventorAllen J. Bronowicki
Life of this patent
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Abstract
A vibratory isolator in one example comprises at least one uniform mass inertia component and at least one uniform compliant component which are configured to exhibit a vibratory bandgap and which are configured to exhibit shear/bending coupling. A further implementation of the invention comprises a vibratory isolator comprised of an isolator and a plurality of disk inertias affixed to the isolator such that the vibratory isolator exhibits a vibrational bandgap in a predetermined frequency range.
Claims17
A vibratory isolator, comprising:
- a periodic alternating structure comprising:
- a plurality of mass inertia components, wherein at least one mass inertia component comprises a disk;
- and
- a plurality of compliant components attaching adjacent mass inertia components to each other, wherein at least one compliant component comprises a ring,
- wherein at least one ring is sandwiched between two disks, and
- wherein at least one ring is in contact with at least two disks,
- the periodic alternating structure alternating between the disks and the rings,
- the vibratory isolator providing a vibratory bandgap having a range of frequencies through which vibrations cannot pass, the vibratory bandgap being bounded by an upper rocking mode frequency of approximately 85 Hertz (Hz), the vibratory bandgap being bounded by a lower shearing mode frequency of approximately 60 Hertz (Hz).
5 more elements
A vibratory isolator, comprising:
- a periodic alternating structure comprising:
- a plurality of mass inertia components, wherein at least one mass inertia component comprises a disk;
- and
- a plurality of compliant components attaching adjacent mass inertia components to each other, wherein at least one compliant component comprises a ring,
- wherein a top disk is in contact with one ring, a bottom disk is in contact with one ring, and each of the other disks is in contact with two rings except a top disk and a bottom disk,
- wherein each ring is sandwiched between two disks, and
- wherein each ring is in contact with exactly two disks,
- wherein each ring has a diameter Do
- wherein each disk has a diameter DM that is larger than the diameter Do the periodic alternating structure alternating between the disks and the rings,
- the vibratory isolator providing a vibratory bandgap having a range of frequencies through which vibrations cannot pass,
- the range of frequencies lying between a rocking mode upper frequency and a shearing mode lower frequency,
- the rocking mode upper frequency being adjustable by adjusting a ratio of Dm to Do, and
- the shearing mode lower frequency being adjustable by adjusting a ratio of a mass of at least one disk and a shear stiffness of at least one spring, the vibratory bandgap being bounded by an upper rocking mode frequency of approximately 85 Hertz (Hz), the vibratory bandgap being bounded by a lower shearing mode frequency of approximately 60 Hertz (Hz).
10 more elements
Dependencies are inferred from the claim text.