Self-turning compact vibration damper

Patent metadata

Field	Value
Publication number	US-10619699-B2
Application number	US-201815959962-A
Country	US
Kind code	B2
Filing date	Apr 23, 2018
Priority date	Apr 21, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

Systems, methods, and devices of the various embodiments provide a compact vibration damper configured to be remotely-tunable and/or self-tuning. In various embodiments, a flywheel may be coupled to a shaft that spins a rotary damper. A linear actuator may operate a scissor assembly that moves the flywheel thereby changing the mass moment of inertia of the spinning flywheel without changing the actual mass of the flywheel. The linear actuator may move the scissor assembly and flywheel to tune the compact vibration damper. In additional embodiments, opposing rotary springs may be coupled to the shaft that spins the rotary damper.

First claim

What is claimed is:

1. A vibration damper, comprising:
a base;
a slider assembly coupled to the base;
a housing coupled to the slider assembly, wherein lateral movement of the slider assembly moves the housing;
a shaft supported in the housing;
a rotary damper coupled to the shaft;
a flywheel coupled to the shaft, wherein the flywheel is adjustable to change a mass moment of inertia of the flywheel thereby resulting in a change of the natural frequency of the vibration damper; and
a converter coupled to the shaft and configured to convert linear motion of the housing into rotational motion of the shaft, the rotary damper, and the flywheel.

2. The vibration damper of claim 1 , wherein the rotary damper includes a fluid-filled or viscous rotary damper and the converter includes a spur gear and a rack gear, the spur gear coupled to the shaft, and the rack gear coupled to the base and engaged with the spur gear.

3. The vibration damper of claim 1 , wherein the rotary damper is coupled to one end of the shaft and the flywheel is coupled to the shaft at an opposite end from the rotary damper.

4. The vibration damper of claim 1 , wherein the flywheel comprises one or more adjustable ballast weights.

5. The vibration damper of claim 4 , wherein the flywheel comprises an adjustable ballast weight assembly.

6. The vibration damper of claim 5 , wherein the adjustable ballast weight assembly comprises a scissor arm, a gear activated pivoting arm, or a jackscrew.

7. The vibration damper of claim 5 , wherein the adjustable ballast weight assembly comprises two scissor arms each coupled to at least one of the one or more adjustable ballast weights.

8. The vibration damper of claim 5 , wherein the adjustable ballast weight assembly comprises a swashplate, the vibration damper further comprising:
an actuator coupled to the swashplate, the actuator configured to extend or retract the one or more adjustable ballast weights by movement of the swashplate.

9. The vibration damper of claim 1 , wherein the converter comprises a rack gear and a spur gear.

10. The vibration damper of claim 1 , further comprising:
one or more rotary springs coupled to the shaft such that the one or more springs oppose rotation of the shaft.

11. A vibration damper system for damping vibrations of a structure, the system comprising:
a base configured to couple to the structure;
a slider assembly coupled to the base;
a housing coupled to the slider assembly, wherein movement of the slider assembly moves the housing;
a shaft rotatably supported in the housing;
a rotary damper coupled to the shaft;
a flywheel coupled to the shaft, wherein the flywheel is adjustable to change a mass moment of inertia of the flywheel and thereby change the natural frequency of the vibration damper system; and
a converter coupled to the shaft and configured to convert linear motion of the housing into rotational motion of the shaft, the rotary, damper, and the flywheel.

12. The system of claim 11 , wherein the rotary damper includes a fluid-filled or viscous rotary damper and the converter includes a spur gear and a rack gear, the spur gear coupled to the shaft, and the rack gear coupled to the base and engaged with the spur gear.

13. The system of claim 11 , wherein the rotary damper is coupled to one end of the shaft and the flywheel is coupled to the shaft at an opposite end from the rotary damper.

14. The system of claim 11 , wherein the flywheel comprises one or more adjustable ballast weights.

15. The system of claim 14 , wherein the flywheel comprises an adjustable ballast weight assembly.

16. The system of claim 15 , wherein the adjustable ballast weight assembly comprises a scissor arm, a gear activated pivoting arm, or a jackscrew.

17. The system of claim 15 , wherein the adjustable ballast weight assembly comprises two scissor arms each coupled to at least one of one or more adjustable ballast weights.

18. The system of claim 15 , wherein the adjustable ballast weight assembly comprises a swashplate, and the vibration damper system further comprises:
an actuator coupled to the swashplate, the actuator configured to extend or retract the one or more adjustable ballast weights by movement of the swashplate.

19. The system of claim 11 , wherein the converter comprises a rack gear and a spur gear.

20. The system of claim 11 , further comprising:
one or more rotary springs coupled to the shaft such that the one or more springs oppose rotation of the shaft.

Assignees

• U S A As Represented By The Administrator Of Nasa
• Nasa

Inventors

• Ivanco Thomas G

Classifications

• E04H9/0215

  involving active or passive dynamic mass damping systems · CPC title

• F16F15/28

  Counterweights, {i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft (rotating balancer shafts F16F15/264; correcting-weights for balancing rotating bodies F16F15/32)}; Attaching or mounting same · CPC title

• F16F7/10 Primary

  using inertia effect (F16F13/108, F16F13/22, F16F15/10, F16F15/22 take precedence; stabilising vehicle bodies by means of movable masses B62D37/04; protection of buildings against vibrations or shocks by mass dampers E04H9/0215; arrangements or devices for damping mechanical oscillations of power lines H02G7/14) · CPC title

• F16F15/31

  characterised by means for varying the moment of inertia · CPC title

• F16F15/022 Primary

  using dampers and springs in combination · CPC title