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1. WO2020112232 - TUNED MASS ABSORBER ASSEMBLY AND SYSTEM FOR ATTENUATING FREQUENCY SPECIFIC VIBRATIONAL ENERGY

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[ EN ]

CLAIMS

What is claimed is:

1. A tuned mass absorber assembly, comprising:

a mass structure;

a flexure system comprising:

first and second flexure sections supported by, and extending in opposing directions from, the mass structure; and flexure section mounts situated at distal ends of the first and

second flexure sections, respectively, operable to mount the tuned mass absorber assembly to a structure subject to induced vibrations,

wherein a mass of the mass structure and a stiffness of the flexure

system are selected and designed to tune the tuned mass absorber assembly to attenuate vibrations at a range of input frequencies that include a specific input frequency generated in response to induced vibrations of the structure.

2. The tuned mass absorber assembly of claim 1 , wherein the mass

structure comprises a monolithic mass structure.

3. The tuned mass absorber assembly of claim 1 , wherein the mass

structure comprises a multi-piece mass structure.

4. The tuned mass absorber assembly of claim 3, wherein the multi-piece mass structure comprises:

a first mass section comprising first and second stop support half

openings situated at opposite ends of the first mass section; and a second mass section comprising first and second stop support half openings situated at opposite ends of the second mass section and that cooperate with the first and second stop support half openings of the first mass section to form first and second stop supports, respectively, and first and second flexure stops, respectively, defining respective first and second apertures through the mass structure;

one or more intermediate mass sections coupled to the first and second mass sections,

wherein the first and second flexure sections are coupled to the

intermediate mass section and extend in opposite directions from the intermediate mass section through the apertures of the first and second flexure stops.

5. The tuned mass absorber assembly of claim 4, wherein a cross-sectional area of the first and second apertures of the first and second flexure stops is larger than a cross-sectional area of a cross bar portion of each of the first and second flexure sections to provide a gap, such that the cross bar portions of each of the first and second flexure sections loosely fit within the first and second apertures in the first and second flexure stops, and wherein each of the first and second flexure sections are operable to move or sway in at least one direction along at least one axis.

6. The tuned mass absorber assembly of claim 4, further comprising first and second compliant bumpers supported within the first and second stop supports, respectively, the compliant bumpers each comprising an aperture, wherein the first and second stop supports operate together with the first and second compliant bumpers, respectively, such that the first and second flexure stops comprise compliant flexure stops, the first and second flexure sections extending in opposite directions from the center mass through the first and second apertures in the first and second compliant flexure stops, respectively.

7. The tuned mass absorber assembly of claim 6, wherein a cross-sectional area of the first and second apertures of the first and second compliant flexure stops is larger than a cross-sectional area of a cross bar portion of each of the first and second flexure sections, respectively, to provide a gap, such that the cross bar portions of each of the first and second flexure sections loosely fit within the first and second apertures in the first and second compliant flexure stops, such that each of the first and second flexure sections are operable to move or sway in at least one direction along at least one axis.

8. The tuned mass absorber assembly of claim 4, wherein the first and

second mass sections and the intermediate mass section define a first chamber area and a second chamber area, wherein the first flexure section is situated in the first chamber area, the second flexure section is situated in the second chamber area.

9 The tuned mass absorber assembly of claim 1 , wherein the first and

second flexure sections are defined by a single flexure extending through a bore in the mass structure.

10. The tuned mass absorber assembly of claim 1 , wherein the first and second flexure sections are defined by first and second individual flexures, each of the first and second flexures comprising a flexure coupling operable to mount the first and second flexures, respectively, to the mass structure.

1 1 . The tuned mass absorber assembly of claim 1 , wherein the first and second flexures are substantially identical to each other, and each comprise an elongate cross bar portion having a cross sectional area extending in a first axis such that the flexure is tuned to correspond to a first specific input frequency in the first axis, and extending in a second axis such that the flexure is tuned to correspond to a second specific input frequency in the second axis.

12. The tuned mass absorber assembly of claim 1 , wherein the flexure

section mounts are operable to mount to a vibration isolator coupleable to an electronics assembly payload and to the structure, such that the vibration isolator is operable to attenuate vibrations from the structure to the electronics assembly payload, and such that the tuned mass absorber assembly is operable to attenuate vibrations at the specific input frequency from the structure to the electronics assembly payload.

13. The tuned mass absorber assembly of claim 1 , wherein the tuned mass absorber assembly is substantially symmetrical about three different planes that are orthogonal to one another, and that extend through the tuned mass absorber assembly.

14. The tuned mass absorber assembly of claim 1 , wherein a volume of the mass structure encompasses a majority of a three dimensional perimeter envelope of the tuned mass absorber assembly.

15. A system for attenuating vibrations at a range of frequencies, that

includes a specific input frequency, tending to propagate to an electronics assembly payload, the system comprising:

a vibration isolator having a first mount body coupleable to a support structure chassis, and a second mount body coupled to the first mount body by at least one compliant device, wherein the second mount body is in support of an electronics assembly payload; a mass structure; and

first and second flexure sections supported by, and extending in opposing directions from, the mass structure, each of the first and second flexure sections having a flexure section mount attached to one of the first or second mount bodies of the vibration isolator, such that the mass structure is suspended by the first and second flexure sections about the vibration isolator, wherein the mass structure and the first and second flexure sections define a tuned mass absorber assembly,

wherein a mass of the mass structure and a stiffness of the first and

second flexure sections are selected and designed to tune the tuned mass absorber assembly to attenuate vibrations at a specific range of frequencies that includes a specific input frequency generated in response to induced vibrations of the support structure chassis.

16. The system of claim 15, further comprising a mechanical system

operable to generate vibrations, and comprising the support structure chassis subjectabie to the vibrations at the specific range of frequencies, the system further comprising the electronics assembly payload mounted to the second mount body of the vibration isolator.

17. The system of claim 16, wherein the mechanical system comprises a vehicle having a rotor operable to generate vibrations at the specific input frequency, and wherein the electronics assembly payload comprises an eiectro-opticai sensor assembly.

18. The system of claim 15, wherein the mass structure comprises:

a first mass section comprising first and second stop support half

openings situated at opposite ends of the first mass section;

a second mass section comprising first and second stop support half openings situated at opposite ends of the second mass section and that cooperate with the first and second stop support half openings of the first mass section to form first and second stop supports, respectively, and first and second flexure stops, respectively, defining respective first and second apertures through the mass structure;

an intermediate mass section coupled to the first and second mass

sections, wherein the first and second flexure sections are coupled to the intermediate mass section and extend in opposite directions from the intermediate mass section; and

a first compliant bumper supported by the first stop support, and a

second compliant bumper supported by the second stop support, wherein a flexure portion of the first flexure section loosely fits through an aperture of the first compliant bumper, and wherein a flexure portion of the second flexure section loosely fits through an aperture of the second compliant bumper.

19. A system for attenuating vibrations at a specific input frequency to an electronics assembly payload, comprising:

a mass structure;

first and second flexure sections supported by, and extending in opposing directions from, the mass structure, each of the first and second flexure sections having a flexure section mount;

a mechanical system operable to generate vibrations, and comprising a support structure chassis subjectabie to the vibrations at a specific input frequency, the support structure chassis coupled to the flexure section mounts of the first and second flexure sections; and

an electronics assembly payload having a support structure coupled to the flexure section mounts of the first and second flexure sections, wherein a mass of the mass structure and a stiffness of the first and

second flexure sections are selected and designed to attenuate vibrations at the specific input frequency from the support structure chassis to the electronics assembly payload.

20. The system of claim 19, wherein the mass structure comprises first and second flexure stop supports defining first and second apertures through the mass structure, the system further comprising a first compliant bumper supported by the first stop support, and a second bumper supported by the second stop support, wherein a flexure portion of the first flexure section loosely fits through an aperture of the first compliant bumper, and wherein a flexure portion of the second flexure section loosely fits through an aperture of the second compliant bumper.

21. A method for facilitating the attenuation of excessive vibrations acting on a payload, the method comprising:

identifying vibrations acting on a payload that are induced in response to operation of a mechanical system in support of the payload, the vibrations being propagated to the payload through a structure coupling the payload to the mechanical system, the structure comprising one or more modes;

determining a range of input frequencies, including a specific input

frequency, of those of the vibrations that are representative of excessive vibrations acting on the payload;

selecting a mass structure having a given mass;

selecting a flexure system having a given stiffness; and

forming a tuned mass absorber assembly by supporting the mass

structure from the flexure system, the tuned mass absorber assembly corresponding to the range of input frequencies and the specific input frequency.

22. The method of claim 21 , further comprising coupling the tuned mass absorber assembly to the structure at the one or more modes of the structure to facilitate creation of new system modes, wherein, during operation of the mechanical system, the tuned mass assembly shifts the one or more modes of the structure to their desired frequencies, and minimizing amplification of the range of frequencies and the specific input frequency while simultaneously creating an anti-resonance.

23. The method of claim 21 , wherein the mass structure comprises a multi- piece mass structure comprising first and second mass sections and an intermediate mass section removable from one another, and wherein the flexure system comprises first and second flexure sections, each having a given stiffness, and wherein forming a tuned mass absorber assembly comprises supporting the first and second flexure sections from the intermediate mass section, such that the first and second flexure sections extend in opposing directions from one another from the intermediate mass section through corresponding flexure stops formed in respective first and second ends of the mass structure, the flexure stops being operable to limit the movement of the first and second flexure sections relative to the mass structure in response to an impulse shock.

24. The method of claim 22, further comprising coupling first and second compliant bumpers to the mass structure to form compliant flexure stops operable to limit the movement of the flexure system relative to the mass structure in response to an impulse shock, and extending the first and second flexure sections through respective apertures of the first and second compliant bumpers.