基于滑动-电磁复合轴承的船用电机主动减振技术

Active vibration reduction technology of marine motor based on sliding-electromagnetic composite bearing

船用电机在运行过程中,转子不平衡力会引起电机产生振动并向船体传递,降低舰船隐蔽性。目前船用电机主要采用传统机械轴承(如滑动轴承),导致电机振动缺乏有效控制手段。为有效抑制电机振动传递,引入复合轴承这一新型概念,在滑动轴承两侧并联电磁轴承,从而使电机具备主动控制条件。在减振控制策略上,类比主动噪声控制,基于FxLMS算法以降低电机机脚振动加速度为控制目标,对电机振动进行主动控制。建立四自由度电磁-滑动复合轴承-刚性转子系统动力耦合模型并进行仿真。结果表明,应用FxLMS控制算法控制电磁轴承可有效降低电机机脚振动,从而实现电机减振降噪,有利于提高舰船隐蔽性。

During the operation of the marine motor,the unbalanced force of the rotor will cause the motor to vibrate and transmit to the hull,reducing the concealment of the ship.At present,marine motor mainly adopts traditional mechanical bearings(such as sliding bearings),which leads to the lack of effective control methods for motor vibration.In order to effectively suppress the vibration transmission of the motor,the new concept of composite bearing is introduced,and the active magnetic bearing is paralleled on both sides of the sliding bearing,so that the motor has active control conditions.In terms of vibration reduction control strategy,compared with active noise control,motor vibration is actively controlled based on FxLMS algorithm with reducing the vibration acceleration of motor foot as the control objective.The dynamic coupling model of four degrees of freedom electromagnetic-sliding composite bearing-rigid rotor system is established and simulated.The simulation results show that the application of FxLMS control algorithm to control the active magnetic bearing can effectively reduce the vibration of the motor foot,so as to realize the vibration and noise reduction of the motor and improve the concealment of the ship.