Static structures (e.g. – buildings) – Barrier or major section mounted for in situ repositioning;...
Reexamination Certificate
2000-01-03
2001-07-24
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Barrier or major section mounted for in situ repositioning;...
C052S144000, C052S573100, C244S115000
Reexamination Certificate
active
06263620
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
For the purpose of screening the noise of aircraft engines during the test run, use is made of soundproof hangars that accommodate more or less the entire aircraft. The hangar opening is frequently left completely open, the hangar being oriented such that it screens the emission to the residential side, whereas the opening is directed toward the noise-insensitive side. There are cases, however, in which it is also necessary to take sound-damping measures on the opening side. This means that the opening has to be capable of being closed completely or partially, or that the engines, as sound sources, have to have the walls of the hangar projecting laterally beyond them toward the opening side in order for the free acoustic emission angle to be small enough.
2. Description of the Related Art
In the case of a known soundproof hangar (GB-1089630) with a wide entrance opening for aircraft, the air inlets are arranged in the side walls of the hangar. They are subdivided by a multiplicity of ribs which are located perpendicularly with respect to the side wall and cause the inflowing air to flow transversely with respect to the longitudinal axis of the hangar or the longitudinal axis of the engines. This has considerable disadvantages for those engines which react sensitively to non-uniform incoming flow, for example those which are provided with a bypass. If, as a result of the air guidance contained in the wall, they are subjected to non-uniform incoming flow, they may be damaged and possibly even destroyed.
SUMMARY OF THE INVENTION
An object of the invention is thus to provide an opening-side acoustic barrier which can also be used for the test runs of engines which are sensitive to incoming flow. The solution according to, the invention comprises the features of claim
1
and preferably those of the subclaims.
Accordingly, in the direction or the directions in which sound screening is necessary, the hangar opening is bounded in each case by a series of curved deflecting surfaces as sound-damping bodies which enclose between them flow paths directed into the hangar interior and of which the inner border is directed into the hangar interior, in horizontal section. At least the majority of the acoustic waves which come into contact with the deflecting-surface group from the inside cannot penetrate to the outside without at least one reflection. This is usually enough for sufficient screening. At the same time, however, the deflecting surfaces permit a flow that enters into the hangar in the longitudinal direction, and thus parallel to the engine direction, and can reach the inlet openings of the engines without any great amount of vortex generation.
Although soundproof hangars (FR-A-1439385, FR-A-1444407) in which the air is admitted through the entrance doors, designed as sound-damping bodies, are known, there is nevertheless arranged within the entrance doors, designed as sound-damping means, a multiplicity of edges or points of inflection which result in the air deflected to the engines forming vortices, this adversely affecting engines which are sensitive to incoming flows. The deflecting bodies are not curved.
It may be expedient for the deflecting surfaces to be provided in a moveable manner in order for it to be possible, with the aid of said deflecting surfaces, to close or expose the hangar opening completely or partially. For example, the deflecting surfaces may be combined to form a unit, all parts of which can be moved together. For such a deflecting-surface block, it is possible to provide a common traveling gear mechanism and corresponding rails in the ground, these making it possible to move the block between the open position and closed position. However, there may also be cases in which the deflecting surfaces of the metal sheet can be moved individually in each case or can be pivoted individually or all together.
In most cases, it is sufficient for additional screening to be carried out in the manner according to the invention merely on the opening border. The deflecting surfaces or deflecting-surface groups then adjoin an opening border in each case. However, it is also possible for the entire opening to be closed in the manner according to the invention.
Finally, it is possible for all the deflecting surfaces, or all of the deflecting surfaces which are arranged in the vicinity of the wall edge, to be provided in a stationary manner, in which case they are arranged such that they do not constrict the full opening width.
REFERENCES:
patent: 3234695 (1966-02-01), Johnson
patent: 3543455 (1970-12-01), Walsh
patent: 3739537 (1973-06-01), Barnes
patent: 3940892 (1976-03-01), Lindbergh
patent: 4004382 (1977-01-01), Carlson
patent: 5119935 (1992-06-01), Stump et al.
patent: 5365782 (1994-11-01), Bouis et al.
patent: 1439385 (1966-08-01), None
patent: 1444407 (1966-10-01), None
patent: 1089630 (1967-11-01), None
Alix Yale & Ristas, LLP
Friedman Carl D.
G + H Montage GmbH
Horton Yvonne M.
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