SHAO Zeng-de 1 , LIAO Ming-fu 2 , WANG Si-ji 2 , DONG Chao 1 , DING Xiao-fei 1,2 , LI Quan-kun 2.Transient Response Analysis of GTF Engine Rotor System Under Sudden Unbalance[J].航空发动机,2024,50(2):101-107
Transient Response Analysis of GTF Engine Rotor System Under Sudden Unbalance
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Key Words:GTF engine  multiple body contact  rotor dynamics  sudden unbalance  transient response
Author NameAffiliation
SHAO Zeng-de 1 , LIAO Ming-fu 2 , WANG Si-ji 2 , DONG Chao 1 , DING Xiao-fei 1,2 , LI Quan-kun 2 1. AECC Shenyang Engine Research Institute Shenyang 110015 China 2. School of Power and Energy Northwestern Poly-technical University Xi’an 710072 China 
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Abstract:In response to the transient response problem of a GTF engine low-pressure rotor system under sudden unbalance, a multi- body contact and multi-rotor coupling dynamic model considering meshing elements, planet carrier elements, and diaphragm coupling ele? ments was established based on the finite element method. The method considering nonlinear factors to calculate the transient response was introduced. The transient response of the low-pressure rotor system under sudden unbalance was solved, and the influences of stiffness of key components on sudden unbalance were analyzed. The results show that when the fan rotor experiences sudden unbalance, the vibration amplitude of each component increases suddenly and then stabilizes rapidly, and the low-pressure turbine rotor undergoes significant beat vibrations. The load due to the sudden unbalance is mainly borne by the planet carrier structure and the 1.5th rigid support; The stiffness of the planetary carrier mainly affects the sudden unbalance response of the fan rotor and the outward-transmitting forces at the 1.5th support and the planet carrier. The diaphragm coupling stiffness mainly affects the sudden unbalance response of the booster stage and the stable operation of the rotor after sudden unbalance.
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