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Multilayer constraining and damping implementation method for vibration damping of case of aeroengine

An aero-engine and constrained damping technology, which is applied in the field of aero-engines, can solve problems that affect the safety of aero-engine operation, casing fatigue damage, and large vibration stress of aero-engine casings, achieve good vibration damping suppression effects, and improve fatigue damage resistance Powerful, easy-to-implement effects

Inactive Publication Date: 2015-04-29
AECC SHENYANG ENGINE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Excessive vibration stress of the aero-engine case will cause fatigue damage to the case, thus affecting the safety of the aero-engine operation

Method used

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  • Multilayer constraining and damping implementation method for vibration damping of case of aeroengine
  • Multilayer constraining and damping implementation method for vibration damping of case of aeroengine
  • Multilayer constraining and damping implementation method for vibration damping of case of aeroengine

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Embodiment approach

[0019] This embodiment provides a method for implementing multi-layer constrained damping for vibration reduction of an aero-engine case, characterized in that: the method for implementing multi-layer constrained damping for aero-engine case vibration reduction includes the following steps:

[0020] Step 1: Use lightweight aluminum foil as the constraining material, paste viscoelastic material and constraining material on the surface of the aero-engine casing to be treated in turn, perform multi-layer constrained damping treatment on the aero-engine casing, and establish a multi-layer constrained damping casing vibration analysis Model.

[0021] Step 2: Using the improved transfer matrix method, calculate the vibration characteristics of the multi-layer constrained damping casing, analyze the influence of the thickness of the constrained material, the thickness of the viscoelastic material and the number of layers on the modal loss factor of the multi-layer constrained damping ...

Embodiment 2

[0029] This embodiment provides a method for implementing multi-layer constrained damping for vibration reduction of an aero-engine case, characterized in that: the method for implementing multi-layer constrained damping for aero-engine case vibration reduction includes the following steps:

[0030] Step 1: Use lightweight aluminum foil as the constraining material, paste viscoelastic material and constraining material on the surface of the aero-engine casing to be treated in turn, perform multi-layer constrained damping treatment on the aero-engine casing, and establish a multi-layer constrained damping casing vibration analysis Model.

[0031] Step 2: Using the improved transfer matrix method, calculate the vibration characteristics of the multi-layer constrained damping casing, analyze the influence of the thickness of the constrained material, the thickness of the viscoelastic material and the number of layers on the modal loss factor of the multi-layer constrained damping ...

Embodiment 3

[0039] This embodiment provides a method for implementing multi-layer constrained damping for vibration reduction of an aero-engine case, characterized in that: the method for implementing multi-layer constrained damping for aero-engine case vibration reduction includes the following steps:

[0040] ①Use the improved transfer matrix method to compare the vibration characteristics of the computer case and the multi-layer constrained damping case. Light aluminum foil is used as the constraining material, and the thickness of the constrained layer is determined to be 0.13mm and the thickness of the viscoelastic layer to be 0.05mm.

[0041] ②Before performing multi-layer constrained damping treatment on the casing, firstly use isopropanol to clean the paste surface to remove oil stains. In order to ensure the firmness of the paste, keep the temperature of the casing and the constrained damping material at 50°C.

[0042] ③Do multi-layer constrained damping treatment on the casing. S...

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Abstract

The invention relates to a multilayer constraining and damping implementation method for vibration damping of a case of an aeroengine. The method comprises the following steps: (1) taking lightweight aluminum foil as a constraining material, sequentially sticking a viscoelastic material and the constraining material, carrying out multilayer constraining and damping processing on the case of the aeroengine, and establishing a multilayer constraining and damping case vibration analysis model; (2) determining the number of layers of a multilayer constraining and damping structure by adopting an improved transfer matrix method; (3) enabling the surface to be stuck of the case to keep a certain temperature; (4) gradually sticking a constraining and damping material to the case starting from one end of the constraining and damping material; (5) verifying the vibration damping effectiveness of the multilayer constraining and damping processed case. The method has the advantages that the method is simple and is easy to implement, and the vibration stress of the case can be effectively lowered, so that the fatigue damage resistance of the case is improved; multiple layers of constraining and damping have very good bonding performance and are firm in sticking, so that the case has a good vibration damping suppression effect.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to a method for implementing multi-layer constrained damping for vibration reduction of an aero-engine casing. Background technique [0002] Excessive vibration stress of the aero-engine casing will lead to fatigue damage of the aero-engine, thus affecting the operation safety of the aero-engine. Laying free damping or constrained damping on the casing surface can achieve a good vibration reduction effect, especially constrained damping has a good suppression effect on broadband random vibration response without changing the base structure. The method is simple, safe and reliable. A viscoelastic layer and a constrained layer are pasted sequentially on the surface of the structure to form a traditional constrained damping structure. In order to increase the damping and vibration reduction effect, a viscoelastic layer, constrained layer, viscoelastic layer, constrained layer, etc. can be ...

Claims

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Application Information

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IPC IPC(8): F16F15/02F16F15/04
CPCF16F15/04
Inventor 李成刚郑玲房占鹏王延军宁智毅
Owner AECC SHENYANG ENGINE RES INST
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