CN-115688306-B - Vibration damping performance evaluation method of elastic ring type fulcrum vibration suppression device

CN115688306BCN 115688306 BCN115688306 BCN 115688306BCN-115688306-B

Abstract

The invention provides a vibration damping performance evaluation method of an elastic ring type fulcrum vibration suppression device, which comprises a rigid outer ring, an elastic ring and a bearing outer ring which are coaxial and are arranged from outside to inside, wherein the method comprises the steps of obtaining oil film force F at a designed rotating speed; and calculating a vibration damping performance value Kc at a designed rotating speed according to a formula F r /F t , and comparing the vibration damping performance value Kc with a vibration damping performance evaluation index to evaluate the vibration damping performance of the elastic ring type fulcrum vibration suppression device at the designed rotating speed. The evaluation method of the design can effectively evaluate the vibration reduction effect of the elastic ring fulcrum vibration suppression device design in an earlier scheme stage, and is used for guiding the design of the elastic ring fulcrum vibration suppression device.

Inventors

JIANG ZHIMIN
Lei Xinliang
CHENG RONGHUI
HE JIN
SHI BIN
PANG YANLONG
ZENG YAO
LI MING
GAO XIONGBING
LIU TIANWEN

Assignees

中国航发四川燃气涡轮研究院

Dates

Publication Date: 20260505
Application Date: 20221013

Claims (4)

1. The vibration damping performance evaluation method of the elastic ring type fulcrum vibration suppression device comprises a rigid outer ring, an elastic ring and a bearing outer ring which are coaxial and are arranged from outside to inside, and is characterized by comprising the following steps: Acquiring oil film force F at a design rotating speed; oil film radial force calculation based on oil film force F Tangential force of oil film ; According to the formula / Calculating a vibration damping performance value Kc at a design rotating speed, and comparing the vibration damping performance value Kc with a vibration damping performance evaluation index to evaluate the vibration damping performance of the elastic ring type fulcrum vibration suppression device at the design rotating speed; the method for acquiring the oil film force F at the designed rotating speed comprises the following steps: Acquiring oil film pressure P of the elastic ring type fulcrum vibration suppression device at a designed rotating speed based on simulation or test piece test, wherein the oil film pressure P is the oil film pressure of an outer oil film formed by the circumference of an elastic ring and a rigid outer ring; Calculating oil film force F according to oil film pressure P, design parameters of an elastic ring type fulcrum vibration suppression device and working parameters at a design rotating speed, wherein the working parameters at the design rotating speed comprise radian theta of a connecting line of an oil film force vector and the center of a rigid outer ring and the center of a bearing outer ring, area s of bearing oil film pressure on the inner hole surface of the rigid outer ring and offset distance d of the bearing outer ring relative to the working time at the design rotating speed, and the design parameters of the elastic ring type fulcrum vibration suppression device comprise the axial length of the elastic ring type fulcrum vibration suppression device Inner hole radius R of the rigid outer ring; The oil film force F is calculated as: , ; Radial force of oil film The calculation formula of (2) is as follows: ; Tangential force of oil film The calculation formula of (2) is as follows: 。
2. the method for evaluating vibration damping performance of an elastic ring type fulcrum vibration damping device according to claim 1, wherein the vibration damping performance evaluation index ranges from 0 to 1.
3. The method for evaluating vibration damping performance of an elastic ring type fulcrum vibration suppression device according to claim 2, wherein the evaluation result of vibration damping performance of the elastic ring type fulcrum vibration suppression device at a design rotation speed comprises: When Kc is greater than zero and less than 1, setting the vibration damping performance of the elastic ring type fulcrum vibration suppression device to reach the standard at the rotating speed; When Kc is greater than or equal to 1, the vibration damping performance of the elastic ring type fulcrum vibration suppression device under the set rotating speed is not up to the standard, and the elastic ring type fulcrum vibration suppression device is optimized.
4. The method for evaluating vibration damping performance of an elastic ring type fulcrum vibration damping device according to claim 3, comprising: adjusting the boss height or the boss number of the inner boss on the elastic ring; Or adjusting the boss height or the boss number of the outer bosses on the elastic ring.

Description

Vibration damping performance evaluation method of elastic ring type fulcrum vibration suppression device Technical Field The invention belongs to the field of aeroengine design, relates to a rotor system vibration suppression device testing technology, and particularly relates to a vibration damping performance evaluation method of an elastic ring type fulcrum vibration suppression device. Background In the design process of an aeroengine, along with the pursuit of high thrust-weight ratio and high reliability, the engine is in a working environment with high load and high rotation speed, and further the problem of vibration of the whole engine is increasingly outstanding, and in order to improve the reliability and durability of the engine, a vibration suppression device is generally applied to a rotor system at present. For example, the elastic ring type fulcrum vibration suppression device is used for isolating external transmission vibration of an aeroengine rotor system, and because the structural parameters are complex and the device is only applied to the aeroengine, the design of the device is mostly adopted by experience or trial-and-error methods at present, and the vibration reduction effect of the vibration reduction device is quantitatively represented by lacking a theoretical method, so that the vibration reduction effect of the device can be found only through the external transmission vibration test result in the core machine and even the whole machine test stage, and the development period of the aeroengine is seriously influenced. Disclosure of Invention Aiming at the problem that the vibration damping effect of the elastic ring type fulcrum vibration suppression device lacks an evaluation method, the invention designs the vibration damping performance evaluation method of the elastic ring type fulcrum vibration suppression device, which can effectively evaluate the vibration damping effect of the elastic ring type fulcrum vibration suppression device design at an earlier scheme stage and is used for guiding the design of the elastic ring type fulcrum vibration suppression device. The technical scheme for realizing the aim is that the vibration damping performance evaluation method of the elastic ring type fulcrum vibration suppression device comprises a rigid outer ring, an elastic ring and a bearing outer ring which are coaxial and are arranged from outside to inside, and the method comprises the following steps of: Acquiring oil film force F at a design rotating speed; Calculating oil film radial force F r and oil film tangential force F t based on the oil film force F; and calculating a vibration damping performance value Kc at the design rotating speed according to a formula F r/Ft, and comparing the vibration damping performance value Kc with a vibration damping performance evaluation index to evaluate the vibration damping performance of the elastic ring type fulcrum vibration suppression device at the design rotating speed. Further, the method for obtaining the oil film force F at the designed rotating speed comprises the following steps: Acquiring oil film pressure P of the elastic ring type fulcrum vibration suppression device at a designed rotating speed based on simulation or test piece test, wherein the oil film pressure P is the oil film pressure of an outer oil film formed by the circumference of an elastic ring and a rigid outer ring; And calculating the oil film force F according to the oil film pressure P, the design parameters of the elastic ring type fulcrum vibration suppression device and the working parameters at the design rotating speed. Further, the working parameters at the design rotation speed comprise radian theta of the connecting line of the oil film force vector and the center of the rigid outer ring and the center of the bearing outer ring, the area s of the inner hole surface of the rigid outer ring bearing the oil film pressure, and the offset distance d of the bearing outer ring relative to the working time at the design rotation speed; The design parameters of the elastic ring type fulcrum vibration suppression device comprise the axial length l of the elastic ring type fulcrum vibration suppression device and the inner hole radius R of the rigid outer ring; The oil film force F is calculated as: F(θ)=P(θ)×d(s),d(s)=l·R·d(θ)。 Further, the calculation formula of the oil film radial force F r is: the calculation formula of the tangential force F t of the oil film is as follows: Further, the range of vibration damping performance evaluation indexes is 0-1. Further, the evaluation result of the vibration damping performance of the elastic ring type fulcrum vibration suppression device under the design rotation speed comprises: When Kc is greater than zero and less than 1, setting the vibration damping performance of the elastic ring type fulcrum vibration suppression device to reach the standard at the rotating speed; When Kc is greater than or equal to 1