Combined elastic ring type extrusion oil film damper

Abstract

The invention discloses a combined elastic ring type extrusion oil film damper. The combined elastic ring type extrusion oil film damper comprises an elastic support, a bearing pedestal and an elasticring. The elastic support comprises a positioning end, a cantilever end, an oil returning channel and an oil returning opening. The pedestal bearing is provided with an oil inlet and an inner ring face. The elastic ring is provided with an outer boss, an inner boss and a damping hole. The bearing pedestal is arranged at the cantilever end in a sleeving manner, and the elastic ring is arranged between the inner ring face and the outer side face. Two sealing devices are arranged between the inner ring face and the outer side face and arranged in front of the elastic ring and on the back of theelastic ring correspondingly. The inner ring face abuts against the outer boss to form an outer oil film cavity, and the outer side face abuts against the inner boss to form an inner oil film cavity.The oil inlet communicates with the exterior and the outer oil film cavity, the damping hole communicates with the outer oil film cavity and the inner oil film cavity, the oil returning opening communicates with the exterior and one end of the oil returning channel, and the other end of the oil returning channel is connected with the inner oil film cavity. The combined elastic ring type extrusionoil film damper has the advantages of being good in damping effect and suitable for vibration bistability.

Description

technical field [0001] The invention relates to an aerodynamic damping device, in particular to a combined elastic ring squeeze oil film damper. Background technique [0002] Squeeze film damper (hereinafter referred to as SFD) is a damper that effectively suppresses vibration by the extrusion and shearing of the oil film generated by the movement and radial movement of the damper journal (inner ring), and is mainly used in aerodynamics device. The design of aero-engines pursues high thrust and high power-to-weight ratio, which makes the structure of the engine smaller and the speed higher. For high-speed engines, the structural integrity and reliability problems are very prominent, and the vibration and vibration of the shaft-support system Stability is often the crux of the problem. [0003] Squeeze film damper (SFD) suppresses vibration by adding additional damping items in the shafting support system. For the elastically supported rotor system, it can significantly red...

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Problems solved by technology

[0005] Squeeze oil film damper has outstanding advantages such as obvious vibration reduction effect, simple structure, and high reliability, but it also has some disadvantages, such as bistability, locking, and uncoordinated precession caused by the highly nonlinear characteristics of the oil film. These phenomena will cause excessive vibration of the rotor system or even friction and fatigue, thus limiting the application range of the squeeze film damper; Figure 10 What is shown is the schematic diagram of the bistable state of the existing squeeze oil film damper. The vertical axis A is the amplitude, and the horizontal axis ω is the rotational angular velocity of the main shaft. The neck "jumps" from the large orbit to the small orbit at 3-4; the rotor passes through 5-6-7-2-1 during deceleration, and "jumps" from the small orbit to the large orbit at 6-7

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