|Table of Contents|

Torsional coupled vibration characteristics of multi-stage blade disc-shaft system of aeroengine(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年03期
Page:
79-88
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Torsional coupled vibration characteristics of multi-stage blade disc-shaft system of aeroengine
Author(s):
XU Zi-li;  ZHOU Zi-xuan
(State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)
Keywords:
aeroengine;  blade disc-shaft system;  assume mode method;  vibration characteristic;  multi-stage coupling
PACS:
V231.96
DOI:
-
Abstract:
Aiming at the multi-stage blade disc rotor structure, the coupling effect of multi-stage blade bending deformation and shaft torsional deformation was taken into account, the centrifugal rigidity ofblade was lead in, and the coupling vibration model containing multi-stage blades, two-stage blade discs and shaft was established. The differential equations of multi-stage blade disc-shaft coupling vibration were derived by using Hamilton principle, the system mass matrix and stiffness matrix were obtained by using numerical integration method, and then the coupled modes of the system were solved. The effects of natural frequency of blade disc, blade length, blade disc spacing and blade twist angle on vibration characteristics were studied. Analysis result shows that the two-stage blade disc-shaft coupling vibration includes 3 types of coupling modes, and the natural frequency of each order is separated from each other at the boundary of blade disc natural frequencies. When the blade length is less than 1 m, the first and second order coupling frequencies are greatly affected by the radius of shaft. When the blade length exceeds 1 m, the first and second order coupling frequencies are greatly affected by the blade length. When the system rotation speed is 2 000 rad·s-1,the variation amplitudes of 1-3 order coupling mode frequencies decrease by 5, 3 and 7 Hz under the influence of blade disc spacing, respectively. The speed-frequency curve has obvious frequency steering characteristics, the blade twist angle increases by 60°, and the steering area increases by 500 rad·s-1. The two-stage blade disc system will produce coupling modes different from the single-stage blade disc system, and the coupling frequency will be significantly affected by both short blade and long blade. The changes of blade twist angle and blade disc spacing will make the coupling area move, which reduces the risk of resonance that may occur.3 tabs, 10 figs, 27 refs.

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Last Update: 2019-06-27