Tuned mass damper for tubes

Patent metadata

Field	Value
Publication number	US-10280791-B2
Application number	US-201615207207-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 11, 2016
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A tuned mass damper for reducing vibration on a component includes a shaft connector member configured to be coupled to the component and a cable termination member. The tuned mass damper also includes at least one cable coupled to the shaft connector member and to the cable termination member such that vibration of the component is transferred to the at least one cable via the shaft connector member and increased or decreased by the at least one cable.

First claim

The invention claimed is:

1. A tuned mass damper for increasing or decreasing vibration on a component, comprising:
a shaft connector member configured to be coupled to the component;
a cable termination member; and
a cable having a plurality of strands, the cable coupled to the shaft connector member and to the cable termination member such that vibration of the component is transferred to the plurality of strands of the cable via the shaft connector member and the plurality of strands are configured to generate heat by vibrating against one another.

2. The tuned mass damper of claim 1 , wherein the component is a shaft and the cable termination member is configured to be annularly positioned about the shaft, and wherein a gap exists between the cable termination member and the shaft.

3. The tuned mass damper of claim 1 , wherein the tuned mass damper is tuned to have a damper frequency that reduces vibrations at a resonant frequency of the component.

4. The tuned mass damper of claim 1 , wherein the tuned mass damper is tuned by adjusting at least one of a length of the cable, a mass of the cable termination member, a total number of strands of the cable, a diameter of the cable, or a material of the cable.

5. The tuned mass damper of claim 1 , wherein the component is a shaft of an augmentor spray bar of a gas turbine engine.

6. The tuned mass damper of claim 1 , wherein each of the shaft connector member, the cable, and the cable termination member include at least one of a nickel-chromium-based alloy or a stainless steel.

7. The tuned mass damper of claim 1 , wherein the shaft connector member includes a first portion and a second portion configured to be positioned about the component and coupled together to annularly surround a portion of the component.

8. The tuned mass damper of claim 7 , wherein the first portion and the second portion of the shaft connector member are configured to be coupled together via at least one of welding, brazing, or a physical connector.

9. An augmentor spray bar for use in a gas turbine engine, comprising:
a tubular shaft defining a fuel passageway through which fuel may flow;
a fuel jet coupled to the tubular shaft and configured to receive the fuel from the fuel passageway and to output the fuel; and
a tuned mass damper having:
a shaft connector member configured to be coupled to the tubular shaft,
a cable termination member, and
a cable having a plurality of strands, the cable coupled to the shaft connector member and to the cable termination member such that vibration of the tubular shaft is transferred to the plurality of strands of the cable via the shaft connector member and the plurality of strands are configured to generate heat by vibrating against one another.

10. The augmentor spray bar of claim 9 , wherein the cable termination member is positioned annularly about the tubular shaft and wherein a gap exists between the cable termination member and the tubular shaft.

11. The augmentor spray bar of claim 9 , wherein the tuned mass damper is tuned to have a damper frequency that reduces vibrations at a resonant frequency of the tubular shaft.

12. The augmentor spray bar of claim 9 , wherein the tuned mass damper is tuned by adjusting at least one of a length of the cable, a mass of the cable termination member, a total number of strands of the cable, a diameter of the cable, or a material of the cable.

13. The augmentor spray bar of claim 9 , wherein each of the shaft connector member, the cable, and the cable termination member include at least one of a nickel-chromium-based alloy or a stainless steel.

14. The augmentor spray bar of claim 9 , wherein the shaft connector member includes a first portion and a second portion configured to be positioned about the tubular shaft and coupled together.

15. A strut box for use in a turbine exhaust case of a gas turbine engine having afterburning capabilities, comprising:
a casing defining a cavity;
an augmentor spray bar at least partially positioned within the cavity and having a shaft; and
a tuned mass damper having:
a shaft connector member positioned annularly about the shaft and coupled to the shaft,
a cable termination member positioned annularly about the shaft, and
a cable having a plurality of strands, the cable coupled to the shaft connector member and to the cable termination member such that vibration of the shaft is transferred to the plurality of strands of the cable via the shaft connector member and the plurality of strands are configured to generate heat by vibrating against one another.

16. The strut box of claim 15 , wherein a gap exists between the cable termination member and the shaft.

17. The strut box of claim 15 , wherein the tuned mass damper is tuned to have a damper frequency that reduces vibrations at a resonant frequency of the shaft.

18. The strut box of claim 15 , wherein the tuned mass damper is tuned by adjusting at least one of a length of the cable, a mass of the cable termination member, a total number of strands of the cable, a diameter of the cable, or a material of the cable.

19. The strut box of claim 15 , wherein each of the shaft connector member, the cable, and the cable termination member include at least one of a nickel-chromium-based alloy or a stainless steel.

20. The strut box of claim 15 , wherein the shaft connector member includes a first portion and a second portion configured to be positioned about the shaft and coupled together.

Assignees

• United Technologies Corp

Inventors

• Peters Donald W
• Sadil Andreas
• Rappoli Nico M
• Ramlogan Amarnath

Classifications

• F02C7/22

  Fuel supply systems · CPC title

• F16F7/116

  on metal springs · CPC title

• F05D2230/237

  Brazing · CPC title

• F01D25/162

  Bearing supports · CPC title

• F02K3/10

  by after-burners (F02K3/105 takes precedence) · CPC title