磁悬浮轴承对基础激励抑制能力有限，当基础激励导致转子振动大于其悬浮间隙时，磁悬浮轴承系统转定子间会产生碰摩损伤以致设备损坏。针对上述问题，提出了结合隔振器和磁悬浮轴承主动控制器的基础激励抑振方法。在建立基础激励下磁悬浮转子模型的基础上，进一步考虑隔振器、基础、磁悬浮轴承定子相互耦合作用，以广义力形式将三者耦合关系转移到磁悬浮转子系统方程的刚度、阻尼矩阵中，建立了磁悬浮转子-隔振器耦合系统机电一体化模型。根据耦合模型分析不同简谐激励下隔振器设计参数变化对转子振幅的影响，并基于转子振幅变化规律，以隔振器最大变形、最大加速度、转定子间隙为设计目标，推导出合适的隔振器刚度范围。结合隔振器-高刚度主动控制器的耦合抑振作用，从理论和试验分析了耦合系统对基础激励的抑振效果。结果表明，与没有隔振器作用的磁悬浮转子系统相比，采用隔振器-高刚度控制器耦合控制可将转子最大振幅从0.052mm降低到0.011mm以内，转子整体振幅小于保护间隙（0.125mm）的10%。
Abstract
Active Magnetic Bearing (AMB) has limited ability to suppress the base excitation. When the vibration of the rotor caused by the base excitation is greater than its suspension gap, the rubbing damage between the rotor and stator of the magnetic bearing system will occur, resulting in equipment damage. In view of the above problems, the base excitation vibration suppression method combining the isolator and the active controller of magnetic bearing is proposed. On the basis of establishing the magnetic bearing rotor model under the base excitation, further considering the mutual coupling effect of vibration isolator, base and magnetic suspension bearing stator, the coupling relationship of the three is transferred to the stiffness and damping matrix of the magnetic rotor system equation in the form of generalized force, and the electromechanical integration model of the magnetic suspension rotor-vibration isolator coupling system is established. According to the coupling model, the influence of vibration isolator design parameters on rotor amplitude under different harmonic excitations is analyzed. Based on the variation of rotor amplitude, the maximum deformation, maximum acceleration and rotor stator clearance of vibration isolator are taken as the design objectives, and the appropriate stiffness range of vibration isolator is derived. Combined with the coupling vibration suppression effect of isolator-high stiffness active controller, the vibration suppression effect of the coupling system on the base excitation is analyzed theoretically and experimentally. The results show that compared with the magnetic suspension rotor system without isolator, the maximum amplitude of the rotor can be reduced from 0.052 mm to 0.011 mm by using isolator-high stiffness controller coupling control, and the overall amplitude of the rotor is less than 10 % of the protection gap (0.125 mm).
关键词
磁悬浮轴承 /
转子动力学 /
基础激励 /
隔振器 /
振动控制
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Key words
active magnetic bearing /
rotor dynamics /
base excitation /
isolator /
vibration control
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