低压转子初始弯曲双转子系统跨坐标系建模方法

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Abstract Aiming at the problem of initial bending of low-pressure rotor existing in a dual-rotor system of aero-engine, considering intermediate bearing offset, the cross coordinate system modeling method for a dual-rotor system was proposed.This method could solve the problem of different motion forms of high-pressure (HP) rotor and low-pressure (LP) one leading to their modeling being not able to be done in a unified coordinate system.Firstly, finite element models of HP and LP rotors were built in different coordinate systems based on their coupled motion behavior.Then, differential equations of motion for HP and LP rotors were obtained with Lagrange equation.The coordinate transformation of inner and outer rings’ DOFs of intermediate bearing was used to realize HP and LP rotors’ cross coordinate system DOF coupling.LP rotor’s initial bending caused its mass eccentricity and angle skewing to bring its additional centrifugal load and gyroscopic moment.Due to intermediate bearing’s position offset, HP rotor’s differential equations of motion had time-varying stiffness and time-varying damping terms, so its additional excitation load were more complex.Intermediate bearing connected different coordinate systems, so it produced time-varying stiffness after coordinate transformation.Finally, some computation examples were used to compare the proposed model’s steady state responses with those of the traditional one.The results showed that the response amplitude of the proposed model is obviously larger than that of the tradition one when LP rotor’s rotating speed is close to its critical speed.

Key words： dual-rotor intermediate bearing initial bending base excitation DOF coupling

Received: 05 June 2018 Published: 28 January 2020

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	Articles by authors
	LIU Yu1
	WANG Jianjun1
	CHEN Liqiang1
	WANG Zhi1
	2

Cite this article:

LIU Yu1,WANG Jianjun1,CHEN Liqiang1, et al. Cross coordinate system modelling method for a dual-rotor system with initial bending of its low-pressure rotor[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 60-68.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I3/60

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