The influence of Alford force and active magnetic bearing on the dynamic behavior of a rotor system

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (8) : 222-229.

WANG Xiaohu, YAN Guangrong, HU Yaoyao, TANG Rui

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Abstract

The dynamic characteristics of a rotor system incorporating flow induced Alford forces and electromagnetic forces of active magnetic bearings (AMBs) were studied, based on a simplified model high-pressure rotor of an aero engine supported by AMBs.The Timoshenko beam theory and a finite element method were utilized to model the rotor.Electromagnetic forces of the AMBs controlled by differential PID methods and flow induced Alford forces at the tip of the compressor vanes were introduced, before the dynamic responses of the rotor system were calculated through the Newmark-β method.The results reveal complex dynamic behaviors of the rotor system simultaneously excited by the nonlinear Alford forces and bearing electromagnetic forces.Control parameters of the AMBs show remarkable influences on the rotor system dynamics, by changing it into period 1, multi-period and quasi-period motions with different values.Therefore, for rotors supported by AMBs and with axial compressors, effects of the flow induced Alford forces and electromagnetic forces need to be considered before determining control parameters.

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active magnetic bearing / Alford force / nonlinear / rotor dynamics

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WANG Xiaohu, YAN Guangrong, HU Yaoyao, TANG Rui. The influence of Alford force and active magnetic bearing on the dynamic behavior of a rotor system[J]. Journal of Vibration and Shock, 2020, 39(8): 222-229

References

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