The dynamic characteristics of a multi-electric aero-engine simulation rotor system supported by magnetic bearings,including the unbalanced magnetic pull (UMP) of a switch reluctance motor and the Alford force excited by the compressor blade tip airflow,were analyzed.The simulation rotor system was established based on Timoshenko beam theory and the finite element method,the UMP of the 12/8-pole three-phase switch reluctance motor and the airflow-excited Alford force were introduced.The calculation results show that the motor's UMP reduces the rotor's critical speed,but when the Al-ford force is present,the motor's UMP will increase the rotor's stability threshold.The Alford force and motor magnetic pull introduce various harmonic and sub-harmonic excitations.And as the speed changes,the rotor exhibits different dynamic characteristics.Changing the control parameters of the magnetic suspension bearings can alter the rotor's equilibrium posi-tion,motion trajectory and amplitude,indicating that active control of the engine rotor can be achieved by adjusting these control parameters to change the rotor's kinetic characteristics.
关键词
振动与波/多电航空发动机/磁悬浮轴承/不平衡磁拉力/Alford力/转子动力学
Key words
vibration and wave/multi-electric aero-engine/active magnetic bearing/unbalanced magnetic pull/Alford force/rotordynamics
维普
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