Dynamic Characteristics of Rotor-SFD-Support System Excited by Base Harmonic Excitations Using MHB-AFT Method

Bo,Zhang; Xi,Chen; Fengguang,Xiang; Xiaohua,Gan; Guangming,Ren

2023-01-13

10.1115/1.4056048

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME   影响因子和分区

0742-4795

1528-8919

When operating at high speed, aeroengines mounted on the aircrafts also perform complicated maneuvering flights along with the aircrafts. The engine rotor systems will undergo forced motions excited by base movements and mass unbalance, which may lead to severe vibrations. Squeeze film damper (SFD) is generally used for vibration damping in aeroengine, but it also introduces structural nonlinearity like bistable jump. Moreover, the reliability of SFD is also affected by base excitations. Therefore, it is necessary to investigate the nonlinear dynamic behavior of rotor-SFD-support system excited by base motions. Taking a muti-disk rotor shaft supported by two SFDs with squirrel cages as the research object to simulate a gas generator in a turboshaft engine, the steady-state responses of the rotor system were calculated by multidimensional harmonic balance combined with alternating frequency/time domain method (MHB-AFT). The effects of base harmonic rotations and mass unbalance on steady-state responses of rotor system were investigated. The results indicate that the time-varying parametric excitations of base motions have strong effects on amplitude-frequency response of transverse displacement of rotor system. The critical speeds and resonant amplitudes of responses change with the magnitude and frequency of several base harmonic rotations. The variation of the frequency of base harmonic motion has the most significant impact on the amplitude-frequency response of transverse displacement of rotor system. The increase of base harmonic frequency will lead to multiple local peaks in the response curves, especially in the case of base harmonic rolling motion. In addition, the combination of base harmonic rotation around pitching and yawing axes results in significantly different response characteristics. Therefore, the influence of base harmonic motions should be considered during the structural design and damping optimization of SFDs.

base excitation harmonic balance method squeeze film damper steady-state response

SCI ; EI

英语

第一 ; 通讯

Engineering

Engineering, Mechanical

WOS:001124085000003

ASME International

20224513090504

Aircraft Engines ; Electric Generators ; Excited States ; Frequency Response ; Gas Generators ; Harmonic Analysis ; Rotating Machinery ; Rotation ; Structural Design

Structural Design, General:408.1 ; Gas Fuels:522 ; Mechanical Devices:601.1 ; Aircraft Engines, General:653.1 ; Electric Generators:705.2 ; Numerical Methods:921.6 ; Mechanics:931.1 ; Atomic And Molecular Physics:931.3 ; Quantum Theory ; Quantum Mechanics:931.4

ENGINEERING

人工提交

正式出版

南方科技大学力学与航空航天工程系 广东 深圳 518055

Bo,Zhang,Xi,Chen,Fengguang,Xiang,et al. Dynamic Characteristics of Rotor-SFD-Support System Excited by Base Harmonic Excitations Using MHB-AFT Method[J]. JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME,2023,145(6):061008.

Bo,Zhang,Xi,Chen,Fengguang,Xiang,Xiaohua,Gan,&Guangming,Ren.(2023).Dynamic Characteristics of Rotor-SFD-Support System Excited by Base Harmonic Excitations Using MHB-AFT Method.JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME,145(6),061008.

Bo,Zhang,et al."Dynamic Characteristics of Rotor-SFD-Support System Excited by Base Harmonic Excitations Using MHB-AFT Method".JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME 145.6(2023):061008.