磁悬浮轴承主动隔振方法研究

Research on the Active Vibration Isolation Method by Magnetic Bearing

使用磁悬浮轴承支承的船舶、潜水艇的推进轴系及流体机械主轴在工作时,常受到一定频率的轴向外部激振力,该力传递给机座时会造成机座振动,严重影响工作稳定性,因此如何使用磁悬浮轴承对定频外部激振力进行隔振有重要意义。针对转子在运行过程中可能会受到的定频外部激振力干扰问题,可使用基于陷波器的磁悬浮轴承控制方法进行隔振。陷波器的引入减弱了磁悬浮轴承对外部激振力频率的转子振动的主动控制作用,从而使转子所受外部激振力尽可能少的传递给机座,达到机座隔振的目的。以磁悬浮轴承-转子实验台为研究对象,进行了模拟外部激振、激振器外部激振实验,完成了轴向、轴向及径向隔振的分析对比研究。实验结果表明:使用试验台模拟转子所受外部激振力时,引入陷波器可使机座振动加速度减小95%以上;使用激振器对转子施加激振力时,引入陷波器可使机座振动加速度减小约60%。

The propulsion shafting and the main shaft of fluid machinery of ships and submarines supported by magnetic bearings may subjected to the axial external excitation force at work.When the force is transmitted to the base,it would cause the base vibration and seriously affect the working stability.Therefore,the use of the magnetic bearing to isolate the constant frequency external excitation force is of great significance.In order to solve the problem that the rotor may be disturbed by the external excitation force of constant frequency in the process of operation,the magnetic bearing control method based on notch filter can be used for vibration isolation.The introduction of the notch filter weakens the active control effect of the magnetic bearing on the external exciting force frequency of the rotor vibration,so that the exciting force of the rotor could be transmitted to the base as small as possible,so as to achieve the purpose of the base vibration reduction.Taking the magnetic bearing rotor test-bed as the research object,the simulation of external excitation and external excitation experiment of exciter were carried out.The analysis and comparison of axial vibration isolation,axial and radial vibration isolation were completed.The experimental results show that the vibration acceleration of the frame can be reduced by more than 95%when using the test-bed to simulate the external excitation force of the rotor,and by about 60%when using the vibration exciter to apply the excitation force to the rotor.