Nanocellular foam damper

Patent metadata

Field	Value
Publication number	US-2016251979-A1
Application number	US-201415030622-A
Country	US
Kind code	A1
Filing date	Oct 21, 2014
Priority date	Oct 23, 2013
Publication date	Sep 1, 2016
Grant date	—

Abstract

A machine includes a section that defines a target vibrational mode to dampen and a nanocellular foam damper that includes interconnected ligaments in a cellular structure. The interconnected ligaments have an average ligament size defined with respect to a vibrational loss modulus of the nanocellular foam damper and the target vibrational mode. Also disclosed is a method of damping vibration.

First claim

What is claimed is:

1 . A machine comprising:
a section defining a target vibrational mode to dampen; and a nanocellular foam damper including interconnected ligaments in a cellular structure, the interconnected ligaments having ligament properties defined with respect to the loss modulus and tan δ (tan delta) of the nanocellular foam damper and the target vibrational mode.

2 . The machine as recited in claim 1 , wherein the ligament size is a width dimension, and the width dimension is less than 1000 nanometers.

3 . The machine as recited in claim 1 , wherein the ligament is composed of nano-materials.

4 . The machine as recited in claim 1 , wherein the ligament size is a width dimension, and the width dimension is less than 100 nanometers.

5 . The machine as recited in claim 1 , wherein the interconnected ligaments include at least one metal.

6 . The machine as recited in claim 5 , wherein the at least one metal is selected from the group consisting of manganese, titanium, tungsten, vanadium, niobium, hafnium, tantalum, rhenium, ruthenium, iridium, palladium, platinum, zirconium, cobalt, yttrium, copper, molybdenum, aluminum, chromium, iron, nickel, and combinations thereof.

7 . The machine as recited in claim 1 , wherein the interconnected ligaments include at least one ceramic material is a silicon carbide, silicon nitride or metal silicide.

8 . The machine as recited in claim 1 , wherein the metal interconnected ligaments include at least one ceramic filler material as a coating or mixture.

9 . The machine as recited in claim 1 , wherein the nanocellular foam damper is fully enclosed in a solid shell.

10 . The machine as recited in claim 9 , wherein the interconnected ligaments and the solid shell are metals.

11 . The machine as recited in claim 10 , wherein the metals are different.

12 . The machine as recited in claim 1 , wherein the nanocellular foam damper is a uniform thickness coating.

13 . A method of damping vibration in a machine, the method comprising:
identifying a target vibrational mode to dampen; and tuning a nanocellular foam damper according to the target vibrational mode by selecting ligament properties of interconnected ligaments of the nanocellular foam damper with respect to a loss modulus and tan δ (tan delta) of the nanocellular foam damper and the target vibrational mode.

14 . The method as recited in claim 13 , including selecting the average ligament size to be less than 1000 nanometers.

15 . The method as recited in claim 13 , wherein the ligament is composed of nano-materials.

16 . The method as recited in claim 13 , wherein the metal nanocellular foam damper includes a metal and at least one ceramic filler material as a coating or mixture.

17 . The method as recited in claim 13 , wherein the interconnected ligaments include a material selected from the group consisting of metals, ceramic materials, and combinations thereof.

18 . A gas turbine engine comprising:
a compressor section; a combustor arranged in communication with the compressor section; and a turbine section arranged in communication with the combustor, the compressor section, the combustor and the turbine section defining a core flow path, wherein at least a portion of the core flow path is configured to be operable at a temperature of 300° C. or greater, the portion having a component including a nanocellular foam vibration damper.

19 . The gas turbine engine as recited in claim 18 , wherein the nanocellular foam vibration damper includes interconnected ligaments in a cellular structure, the interconnected ligaments having ligament properties defined with respect to a vibrational loss modulus of the nanocellular foam vibration damper and a target vibrational mode to be attenuated in the gas turbine engine.

20 . The gas turbine engine as recited in claim 18 , wherein the nanocellular foam vibration damper includes interconnected ligaments in a cellular structure, and the interconnected ligaments include a material selected from the group consisting of metals, ceramic materials, and combinations thereof.

Assignees

• United Technologies Corp

Inventors

• Birnkrant Michael J

Classifications

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• F01D5/26

  Antivibration means not restricted to blade form or construction or to blade-to-blade connections {or to the use of particular materials} · CPC title

• F02C7/24

  Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title

• F16F2224/02

  solids · CPC title