Non-linear Transient Rotor-dynamics Analysis of Fan Blade Out

doi:10.3901/JME.2019.13.023

Abstract

Abstract: The research of fan blade out is a significant issue on the phase of structural reliability and safety design. A FBO event may be caused by fatigue break or impact damage by foreign objects. Low-pressure rotor system would vibrate severely with huge unbalance force. Because of that, the tip of blades would rub with the containment. Innovative point of the research is to calculate transient response remaining fan blades. The analysis procedure is divided into three parts. Firstly, critical speed and transient unbalance response analysis of various cross-section shaft with multi-supports have been done. Secondly, non-linear dynamical equations of fan blades' tip subjected impact and load at root of blade are obtained. Finally, combine dynamical equations of shaft with fan blades subjected impact to analyze transient response and rotate speed after FBO. Transient response of different aero-engines and gas turbines can be analyzed by modifying parameters. Finally, general theoretical model of analyzing the rubbing between blades and case can be obtained.

Key words: contact-impact and rubbing, FBO, non-linear transient rotor-dynamics

CLC Number:

V231
V231

LIU Yang, LI Cheng, LI Fucai, LI Hongguang. Non-linear Transient Rotor-dynamics Analysis of Fan Blade Out[J]. Journal of Mechanical Engineering, 2019, 55(13): 23-37.

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