Parallel and outer ring staggered type extrusion oil film damper

Abstract

The invention provides a parallel and outer ring staggered type extrusion oil film damper. The parallel and outer ring staggered type extrusion oil film damper comprises a sleeve 3, a bearing 4, a support 5, a pull rod 6, a support 7, a case 8, an outer layer oil film oil supply hole 9, an inner layer oil film oil supply hole 10, an outer layer oil film damper A and an inner layer oil film damper,wherein the outer layer oil film damper comprises the case 8 and the support 5, and the inner layer oil film damper B comprises the sleeve 3 and the support 5; the outer layer oil film damper A comprises an oil film which fills between an outer-layer oil film damper shaft neck 2A and an outer layer oil film damper outer ring 1A, the inner layer oil film damper B is composed of an oil film which fills between the inner layer oil film damper shaft neck 2B and the inner layer oil film damper outer ring 1B. Compared with a traditional extrusion oil film damper, the rigidity of the oil film generated when the same oil film is damped is greatly reduced, the situation that the rigidity of the oil film is highly nonlinear is effectively inhibited, and the vibration reduction efficiency of the oilfilm damper is improved.

Description

technical field [0001] The invention belongs to the technical field of damping and vibration reduction, and in particular relates to a parallel-connected and resistance-increasing squeeze oil film damper with outer rings dislocated. Background technique [0002] Squeeze film dampers such as figure 1 As shown, due to its simple structure and good vibration reduction effect, it has been widely used in aero-engines. In the actual aero-engine, the unbalanced force due to the gravity of the aero-engine rotor system, manufacturing and assembly errors and other unbalanced factors often cause the vibration of the rotor. In order to reduce the vibration amplitude of the rotor system, squeeze oil film dampers are usually used at the rotor support to suppress the vibration of the rotor system. The center of the inner ring of the damper is the center of the outer ring of the precession, and the precession frequency is circular precession, and the inner ring of the damper moves, such a...

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Problems solved by technology

[0003] However, most of the dampers are ring-shaped structures, and it will be difficult to further improve the damping. In addition, the rotor system will generate a lot of vibration near the critical speed, and the oil film will show a great deal of pressure under such highly squeezed conditions. The nonlinearity of the oil film, which is more obvious in the stiffness of the oil film, will aggravate the vibration of the rotor system and even cause instability

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