Vibration-absorption designing method of damping structure of blisk

Abstract

The invention provides a vibration-absorption designing method of a damping structure of a blisk. The method comprises steps as follows: the mounting position range of a damper is selected according to a blisk model; the range of exciting force is determined, and a vibration amplitude monitoring point is selected; a contact surface and the positive pressure range are determined; vibration amplitudes of the monitoring point are calculated as exciting force, positive pressure and damper mounting positions vary; optimal dimensionless positive pressure is determined, and dimensionless positive pressure is the ratio of positive pressure to exciting force; the optimal mounting position and the optimal quality of the damper are determined according to the optimal dimensionless positive pressure.

Description

technical field [0001] The disclosure belongs to the technical field of vibration-damping structure design of an integral blisk of an aero-engine, and in particular relates to a method for designing a damping structure of an integral blisk. Background technique [0002] The blisk structure is a new type of high-performance aero-engine rotor, and it has been widely used in engine fans, compressors, and turbines. The blisk technology has good engineering application value: it can reduce the weight of the rotor and increase the thrust-to-weight ratio of the engine; it can improve the durability and reliability of the engine, reduce the failure rate, and prolong the life of the rotor; it can improve aerodynamic performance and work efficiency . [0003] Although the integral blisk has the above advantages, there are serious problems of vibration and fatigue damage at the same time: (1) Compared with the disc of the tenon joint blisk, the difference in stiffness between the disc...

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Problems solved by technology

[0003] Although the integral blisk has the above advantages, there are serious problems of vibration and fatigue damage at the same time: (1) Compared with the disc of the tenon joint blisk, the difference in stiffness between the disc and the blade is less, and the disc coupling vibration is prone to occur; ( 2) There is no connection structure and contact friction, and the internal damping is very small. In extreme operating environments, vibration and resonance with high stress levels will be generated, which may easily cause high-cycle fatigue or even failure

However, the particle damper produces a lot of noise, and it is still necessary to discuss the particle material selection, placement position and particle energy dissipation capacity under large centrifugal loads when it is applied to the high-speed rotating blisk structure.

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