Landing gear noise attenuation

• US 7,954,757 B2
• Filed: 03/25/2005
• Issued: 06/07/2011
• Est. Priority Date: 03/29/2004
• Status: Active Grant

• Current Assignee: Goodrich Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Goodrich Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Moe, Jeffrey W., Whitmire, Julia, Abeysinghe, Amal, Kwan, Hwa-Wan
• Primary Examiner(s): ELDRED, JOHN W
• Application Number:
  US10/599,495
• Publication Number:
  US 20080142634A1
• Time in Patent Office: 2,265 Days
• Field of Search: 244/100.A, 244/100.R, 244/102.R
• US Class Current: 244/100.00A
• CPC Class Codes: B64C 2025/003 Means for reducing landing gear noise, or turbulent flow around it, e.g. landing gear doors used as deflectors
• CPC Class Codes: B64C 25/34 wheeled type, e.g. multi-wheeled bogies
• CPC Class Codes: Y10T 137/36 With pressure-responsive pressure-control means

Abstract

A landing gear noise attenuator mitigates noise generated by airframe deployable landing gear. The noise attenuator can have a first position when the landing gear is in its deployed or down position, and a second position when the landing gear is in its up or stowed position. The noise attenuator may be an inflatable fairing that does not compromise limited space constraints associated with landing gear retraction and stowage. A truck fairing mounted under a truck beam can have a compliant edge to allow for non-destructive impingement of a deflected fire during certain conditions.

Claims

1. A deployable landing gear truck fairing for a deployable landing gear truck having aft, underside, and forward portions, comprising:

an elongated body connected to a rising front portion, the elongated body and rising front portion capable of partially covering at least the underside and forward portions of the deployable landing gear truck, the elongated body having first and second lateral edges; and

first and second compliant edges affixed to the corresponding first and second lateral edges.

2. The deployable landing gear truck fairing according to claim 1, wherein the elongated body comprises:

a forward assembly and an aft assembly; and

a center seal extending transverse to a direction of the elongated body and positioned between the forward and aft assemblies.

3. The deployable landing gear truck fairing according to claim 2, wherein the rising front portion is part of the forward assembly.

4. The deployable landing gear truck fairing according to claim 2, wherein forward and aft assemblies are separable from one another.

5. The deployable landing gear truck fairing according to claim 2, wherein the center seal is affixed to only one of the forward and aft assemblies.

6. The deployable landing gear truck fairing according to claim 2, wherein, when the truck fairing is mounted on deployable landing gear of an aircraft, the forward and aft assemblies move toward one another when the aircraft takes off, thereby compressing the center seal.

7. The deployable landing gear truck fairing according to claim 2, wherein at least one of the forward assembly and the aft assembly comprises an upper shield plate spaced apart from a lower shield plate.

8. The deployable landing gear truck fairing according to claim 7, further comprising a weight bearing spacer between the upper and lower shield plates.

9. The deployable landing gear truck fairing according to claim 8, wherein the weight bearing spacer is positioned beneath a support mounted on an upper side of the fairing.

10. The deployable landing gear truck fairing according to claim 7, wherein a first portion of the compliant edge occupies a region between the upper and lower shield plates, and a second portion of the compliant edge projects laterally outward from said region between the upper and lower shield plates.

11. The deployable landing gear truck fairing according to claim 8, further comprising a weight bearing spacer between the upper and lower shield plates, wherein the first portion of the compliant edge is laterally outward of the weight bearing spacer.

12. The deployable landing gear truck fairing according to claim 1, wherein the compliant edge comprises one from the group consisting of rubber or fabric stripping, fiber reinforced rubber, nylon brush, spring steel or an inflatable bladder.

13. The deployable landing gear truck fairing according to claim 1, wherein the compliant edge comprises a soft rubber or an elastomeric material.

14. The deployable landing gear truck fairing according to claim 1, wherein:

the elongated body comprises a forward assembly and an aft assembly;

the first lateral edge comprises adjacent first and second lateral edge portions on a first side of the fairing, the first lateral edge portion being associated with the forward assembly and the second lateral edge portion being associated with the aft assembly; and

the second lateral edge comprises adjacent third and fourth lateral edge portions on a second side of the fairing, the third lateral edge portion being associated with the forward assembly and the fourth lateral edge portion being associated with the aft assembly.

15. The deployable landing gear truck fairing according to claim 14, further comprising:

a first compliant edge portion affixed to the first lateral edge portion;

a second compliant edge portion affixed to the second lateral edge portion;

a third compliant edge portion affixed to the third lateral edge portion; and

a fourth compliant edge portion affixed to the fourth lateral edge portion,

such that the first and second compliant edge portions are adjacent to one another and the third and fourth compliant edge portions are adjacent to one another.

16. The deployable landing gear truck fairing according to claim 15, wherein, when the truck fairing is mounted on deployable landing gear of an aircraft, adjacent compliant edge portions are:

spaced apart from one another by a first distance when the aircraft is on the ground; and

move closer to one another when the aircraft is not on the ground.

17. The deployable landing gear truck fairing according to claim 16, wherein opposing surfaces of adjacent compliant edge portions abut one another when the aircraft is not on the ground.

18. The deployable landing gear truck fairing according to claim 16, wherein opposing surfaces of adjacent compliant edge portions are angled.

19. A deployable landing gear truck fairing, comprising:

a pair of adjacent fairing sections defining a forward assembly and an aft assembly suitable for mounting on a truck, each assembly having a first side and a second side;

a center seal affixed to at least one of the forward and aft assemblies and positioned between the two assemblies;

adjacent first and second compliant edge portions affixed to the first side of the forward and aft assemblies; and

adjacent third and fourth compliant edge portions affixed to the second side of the forward and aft assemblies.

20. The deployable landing gear truck fairing according to claim 19, wherein, when the truck fairing is mounted on deployable landing gear of an aircraft, adjacent compliant edge portions are:

spaced apart from one another by a first distance when the aircraft is on the ground; and

move closer to one another when the aircraft is not on the ground.

21. The deployable landing gear truck fairing according to claim 20, wherein opposing surfaces of adjacent compliant edge portions abut one another when the aircraft is not on the ground.

22. The deployable landing gear truck fairing according to claim 21, wherein opposing surfaces of adjacent compliant edge portions are angled.

23. The deployable landing gear truck fairing according to claim 19, further comprising a brake cover fairing.

24. A deployable landing gear truck fairing for a deployable landing gear of an aircraft, comprising:

an elongated body connected to a rising front portion, the elongated body having a forward assembly and an aft assembly, a center seal extending transverse to a direction of the elongated body and positioned between the forward and aft assemblies, and first and second lateral edges; and

first and second compliant edges affixed to corresponding fast and second lateral edges;

wherein, when the truck fairing is mounted on the deployable landing gear of an aircraft, the forward and aft assemblies move toward one another when the aircraft takes off, thereby compressing the center seal.

25. The deployable landing gear truck fairing according to claim 24, wherein the rising front portion is part of the forward assembly.

26. The deployable landing gear truck fairing according to claim 24, wherein forward and aft assemblies are separable from one another.

27. The deployable landing gear truck fairing according to claim 24, wherein the center seal is affixed to only one of the forward and aft assemblies.

28. A deployable landing gear truck fairing for a deployable landing gear of an aircraft, comprising:

an elongated body connected to a rising front portion, the elongated body having a forward assembly, an aft assembly, and first and second lateral edges;

the first lateral edge comprises adjacent first and second lateral edge portions on a first side of the fairing, the first lateral edge portion being associated with the forward assembly and the second lateral edge portion being associated with the aft assembly; and

the second lateral edge comprises adjacent third and fourth lateral edge portions on a second side of the fairing, the third lateral edge portion being associated with the forward assembly and the fourth lateral edge portion being associated with the aft assembly; and

first and second compliant edges affixed corresponding first and second lateral edges.

29. The deployable landing gear truck fairing according to claim 28, further comprising:

a first compliant edge portion affixed to the first lateral edge portion;

a second compliant edge portion affixed to the second lateral edge portion;

a third compliant edge portion affixed to the third lateral edge portion; and

a fourth compliant edge portion affixed to the fourth lateral edge portion,

such that the first and second compliant edge portions are adjacent to one another and the third and fourth compliant edge portions are adjacent to one another.

30. The deployable landing gear truck fairing according to claim 29, wherein, when the truck fairing is mounted on the deployable landing gear of an aircraft, adjacent compliant edge portions are:

spaced apart from one another by a first distance when the aircraft is on the ground; and

move closer to one another when the aircraft is not on the ground.

31. The deployable landing gear truck fairing according to claim 30, wherein opposing surfaces of adjacent compliant edge portions abut one another when the aircraft is not on the ground.

32. The deployable landing gear truck fairing according to claim 31, wherein opposing surfaces of adjacent compliant edge portions are angled.