Variable damping squeeze-film damper for aeroengine

Abstract

The invention discloses a variable damping squeeze-film damper for aeroengine. The variable damping squeeze-film damper comprises an elastic support, a variable damping base, a hydraulic oil chamber,a hydraulic oil flow channel, a hydraulic adjusting screw and a squeeze film, wherein the hydraulic oil chamber is formed in the inner wall of the variable damping base, the hydraulic oil chamber is aflat gap with large space in both sides and small space in the middle after being axially split, and the wall thickness structure which is close to one side of the inner wall surface is in a shape ofa thin wall with thin both sides and a thick middle part. The gap variation range is from 0.2 c to 1 c (c is the thickness of the squeeze film), and the damping variation range of equipment can reach1 Cd to 5 Cd (Cd is a designed minimum damping value); the hydraulic oil chamber communicates with a threaded hole located in the axial end surface of the equipment by virtue of the flow channel, andthe hydraulic adjusting screw is assembled at the threaded hole; and the hydraulic adjusting screw is located above the axis position, the hydraulic oil chamber is circumferentially formed, an oil inlet of the squeeze film is formed in the interrupted position of the hydraulic oil chamber, and oil is supplied to the squeeze film in real time through the oil inlet of the squeeze film.

Description

technical field [0001] The invention belongs to the field of aero-engine rotors, in particular to an aero-engine variable damping extrusion oil film damper. Background technique [0002] Vibration is one of the main causes of structural stability degradation, failure, and even component damage of aero-engines. With the improvement of engine design indicators, the requirements for high speed and low rotor mass are getting higher and higher, and the problem of vibration is becoming more and more prominent. Vibration reduction has also become an important content in the study of aeroengine structural strength. Squeeze film damper is the most commonly used vibration damping device in aero-engine. Up to now, Squeeze Oil Film Damper has almost become a necessary damping device for modern advanced aero-engines. One or more Squeeze Oil Film Dampers are often installed on an engine so that the rotor system has a good performance when it is over critical. vibration characteristics. ...

AI Technical Summary

Problems solved by technology

[0004] However, the damping value of the squeeze oil film damper is fixed at present. In the actual design process, due to the small gap of the squeeze oil film, the processing and assembly errors of the parts will cause the actual oil film gap to fail to meet the design requirements.

At the same time, in the rotor equipment experiment and design stage, in order to find the best damping design value, the damping size of the damper needs to be continuously adjusted, and the equipment with fixed damping cannot meet such requirements

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