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research-article

Study on vibration characteristics of fan shaft of geared turbofan engine with sudden imbalance caused by blade off

[+] Author and Article Information
Jing Wei

State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
weijing_slmt@163.com

Peixin Bai

State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
baipeixin_sklmt@163.com

Datong Qin

State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
dtqin@cqu.edu.cn

Teik C. Lim

Office of The Provost, University of Texas Arlington, Box 19118, 701 South Nedderman Drive Davis Hall, Suite 321, Arlington, TX 76019
teik.lim@uta.edu

Panwu Yang

State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
yangpanwu_sklmt@163.com

Hong Zhang

Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China
zhanghong.siae@hotmail.com

1Corresponding author.

ASME doi:10.1115/1.4039246 History: Received July 03, 2017; Revised February 01, 2018

Abstract

Based on the requirements of the dynamic design of geared turbofan (GTF) engines, the vibration characteristic of the fan shaft is investigated. The effect of sudden imbalance caused by blade off, the time-varying meshing stiffness, and meshing errors on the vibration characteristics are fully considered in the dynamic model. The improved Euler-Bernoulli beam element considering the effects of shear deformation is employed and a coupled relationship between the gear-shaft-bearing-casing is established. Under windmilling condition with a single blade completely lost, the vibration characteristics of the fan shaft of the turbofan engine with and without a gearbox system are compared. The effect of the gear system on the vibration of the fan shaft under different rotating speeds is examined. The results show that the orbit of the fan shaft center in the turbofan engine with the gearbox system exhibits a multi-frequency whirling motion and has a stable limit cycle. Under windmilling condition, the meshing frequency and modal frequency have multiple intersection points. The critical speed is dense and the peak value of the transient vibration of the GTF engine gearbox shows a wave rise with an increase in speed. The results of this study could provide a reference for the parameter design and optimization of GTF engines.

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