Vibration reduction structure of air inlet channel

Abstract

The utility model belongs to the technical field of aviation, and particularly relates to an air inlet channel vibration reduction structure which comprises an inner skin and an outer skin, an air inlet channel is defined by the inner skin, the inner skin is sleeved with the outer skin according to a set distance to form an annular space, and a partition frame connected between the inner skin and the outer skin is arranged in the annular space. And an annular reinforcing hoop is arranged in the annular space. The circumferential Z-shaped reinforcing hoop is designed on the inner skin of the air inlet channel, so that the circumferential bearing capacity of the inner wall of the air inlet channel is improved. In addition, when the inner skin and the outer skin of the air inlet channel are connected with the partition frame, the adhesive film is pasted, and when flowing airflow causes disturbance and the adhesive film is pulled, pressed and deformed, the adhesive film has a large stress-strain delay effect, so that vibration energy is consumed, the vibration amplitude is reduced, and the vibration reduction effect is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aviation technology, and particularly relates to an air inlet duct damping structure. BACKGROUND

[0002] The air inlet duct provides air for the engine, and due to sound fatigue, vibration, abnormal engine operation and other reasons, cracks may occur in the air inlet duct during use, which may cause major accidents. In addition, a large number of air inlet duct skin cracks, rivet loosening and rivet head falling occur in the field use. Therefore, how to solve the fatigue problem of the air inlet duct is a major difficulty in its design. The main reason for the failure is that the structural vibration fatigue damage caused by the noise fluctuation pressure of the noise in the strong noise environment of the air inlet duct. The vibration caused by the noise of the air flow of the air inlet duct causes fatigue damage of the structure, which leads to faults such as air inlet duct skin cracks, rivet loosening and rivet head falling, and brings hidden dangers to flight safety. In order to reduce the faults such as air inlet duct skin cracks, rivet loosening and rivet head falling, and improve the safety of the aircraft, a kind of air inlet duct damping is adopted to reduce the vibration level of the fault position and increase the vibration fatigue life of the skin wall plate. SUMMARY

[0003] In order to solve the above problems, the application provides an air inlet duct damping structure, which comprises:

[0004] The inner skin and the outer skin, the inner skin surrounds the air inlet passage, the outer skin is sleeved outside the inner skin at a set distance to form an annular space, a partition frame connected between the inner skin and the outer skin is arranged in the annular space, and an annular reinforcing hoop is arranged in the annular space.

[0005] Preferably, the partition frame comprises a web plate and a rim strip at both ends of the web plate for connecting the inner skin or the outer skin.

[0006] Preferably, the rim strip is connected with the inner skin or the outer skin through a rivet.

[0007] Preferably, a rubber film is arranged between the rim strip and the inner skin and between the rim strip and the outer skin.

[0008] Preferably, the cross section of the reinforcing hoop is Z-shaped, one connecting surface of the reinforcing hoop is fixedly connected with the outer skin through a rivet to form an annular structure.

[0009] Preferably, the partition frame and the reinforcing hoop are both annular.

[0010] The advantages of the application include that the application designs a reinforcing hoop in a Z shape around the inner skin of the air inlet duct, which increases the circumferential bearing capacity of the inner wall of the air inlet duct. In addition, when the inner skin and the outer skin of the air inlet duct are connected with the partition frame, a rubber film is pasted, when the flowing air flow causes disturbance, the rubber film is subjected to tensile and compressive deformation, and because the rubber film has a large stress-strain hysteresis effect, the vibration energy is consumed, the vibration amplitude is reduced, and the damping effect is achieved.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a preferred embodiment of the application, a cross-sectional view of an air inlet duct damping structure. DETAILED DESCRIPTION

[0012] In order to make the technical solutions of the present application and its advantages clearer, the technical solutions of the present application will be further clearly and completely described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the general design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0013] In addition, it should be further noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" and the like used in the description of the present application should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, and those skilled in the art can understand the specific meaning of the present application according to the specific circumstances.

[0014] As shown in Figure 1 An air inlet duct damping structure comprises:

[0015] An inner skin 1 and an outer skin 5, the inner skin 1 surrounds an air inlet passage, the outer skin 5 is sleeved outside the inner skin 1 at a set distance to form an annular space, a partition frame 4 connected between the inner skin 1 and the outer skin 5 is arranged in the annular space, and an annular reinforcing hoop 6 is arranged in the annular space, the partition frame 4 is arranged at intervals along the axial direction, and the reinforcing hoop 6 is nested between adjacent partition frames 4.

[0016] Preferably, the partition frame 4 comprises a web and a rim strip at both ends of the web for connecting the inner skin 1 or the outer skin 5.

[0017] Preferably, the rim strip is connected to the inner skin 1 or the outer skin 5 by a rivet 2, and the air inlet duct inner wall rivet is selected to be a certain diameter of interference rivet according to the load of the air inlet duct to prevent the rivet from falling off.

[0018] Preferably, a rubber film 3 is arranged between the rim strip and the inner skin 1 or the outer skin 5, when the flowing air flow causes disturbance, the rubber film is subjected to tensile and compressive deformation, and because the rubber film has a large stress-strain hysteresis effect, the vibration energy is consumed, the vibration amplitude is reduced, and the damping effect is achieved, thereby reducing vibration fatigue.

[0019] Preferably, the cross section of the reinforcing hoop 6 is Z-shaped, and one connecting surface is fixedly connected with the outer skin 5 through the rivet 2 to increase the circumferential load bearing capacity of the inner wall of the air inlet channel.

[0020] Preferably, the spacer frame 4 and the reinforcing hoop 6 are both annular, and the reinforcing hoop 6 increases the rigidity of the inner wall of the air inlet channel.

[0021] The advantages of the present application include that the present application designs a circumferential Z-shaped reinforcing hoop on the inner skin of the air inlet channel to increase the circumferential load bearing capacity of the inner wall of the air inlet channel. In addition, when the inner and outer skins of the air inlet channel are connected with the spacer frame, the adhesive film 3 is pasted, when the flowing air flow causes disturbance, the adhesive film 3 is subjected to tensile and compressive deformation, and because the adhesive film 3 has a large stress-strain hysteresis effect, the vibration energy is consumed, the vibration amplitude is reduced, and the vibration reduction effect is achieved.

[0022] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An intake passage damping structure characterized by comprising: Comprise: Inner skin (1) and outer skin (5), the inner skin (1) is surrounded by the inlet channel, the outer skin (5) is sleeved outside the inner skin (1) to form an annular space at a set distance, a partition frame (4) connected between the inner skin (1) and the outer skin (5) is arranged in the annular space, and an annular reinforcing hoop (6) is arranged in the annular space.

2. The intake passage damping structure according to claim 1, characterized by Comprise: The partition frame (4) comprises a web and a rim strip at both ends of the web for connecting the inner skin (1) or the outer skin (5).

3. The intake passage damping structure according to claim 2, characterized by The rim strip is connected with the inner skin (1) or the outer skin (5) by rivets (2).

4. The intake passage damping structure according to claim 3, characterized by A rubber film (3) is arranged between the rim strip and the inner skin (1) and the outer skin (5).

5. The intake passage damping structure according to claim 1, characterized by The cross section of the reinforcing hoop (6) is Z-shaped, one connecting surface is fixedly connected with the outer skin (5) by rivets (2), and an annular structure is formed.

6. The intake passage damping structure according to claim 1, characterized by The partition frame (4) and the reinforcing hoop (6) are both annular.

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