Electromagnetic vibration characteristics of marine high-speed generator frame derived by fundamental magnetic field

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (2) : 195-200.

ZHANG Xian-biao，WANG Dong，GU Tai-ping，LIU De-zhi

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Abstract

With the increase of speed and power-density, the vibration problem of marine high-speed generator has become much more severe. Aiming at this problem, the vertical vibration acceleration at the machine feet of a marine high-speed synchronous generator is studied by finite element method (FEM), which is derived fromradial electromagnetic pull due tofundamental air-gap magnetic fieldwithout load. Theanalysis of vibration characteristicsis conducted under different installations of frame, material stiffness and structural damping. The main influence factors are classified clearly by comparative analysis. Moreover, the simplification of finite element model is introduced. At last, vibration acceleration at the machine feet is calculated by three dimensional harmonic fieldFEM and transient field FEM respectively. The tested vertical vibration acceleration atmachine feet of marine high-speed synchronous generator running as motor without load is presented. The simulation results are compared with test results, where a substantial agreement is achieved. The results show that frame and feet’s vibrations are impacted by installations greatly and the material stiffness is the main influence factor of stator’s vibrationamplitude. Moreover, the frame’s damping has a significant effect on the vibration amplitude distribution at free or flexible installation. The results can provide theoretical reference for marine high-speed generator vibration and noise reduction research.

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electromagnetic vibration / fundamental magnetic field / marine generator / finite element method

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ZHANG Xian-biao，WANG Dong，GU Tai-ping，LIU De-zhi. Electromagnetic vibration characteristics of marine high-speed generator frame derived by fundamental magnetic field[J]. Journal of Vibration and Shock, 2016, 35(2): 195-200

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