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为了能够抑制微振动对在轨运行航天器造成的不利影响,提出了一种由螺旋柔性弹簧(SFS)与磁性弹簧并联构成的低频隔振器;其中,螺旋柔性弹簧作为正刚度元件为系统提供承载能力,并通过有限元建模对其轴向刚度特性进行了数值分析;由两两相吸、同轴配置的3块环形永磁体构成的磁性弹簧为该隔振系统沿轴向提供负刚度以降低系统的固有频率;基于等效电流模型分析讨论了该磁性弹簧的磁刚度特性,并在平衡位置附近对磁刚度作了线性近似。通过分析所设计的低频隔振器与其相应线性隔振系统的位移传递率,比较了2种隔振器的隔振性能。研究结果表明:所提出的低频隔振系统能够有效地隔离低频微幅振动,降低系统的固有频率,进而拓宽了隔振频带;同时,进一步改善了隔振系统在共振区域附近的阻尼特性,有效地降低了共振峰值。
In order to suppress the adverse effect of micro-vibration on on-orbit spacecraft, a low-frequency vibration isolator consisting of a helical flexible spring (SFS) connected in parallel with a magnetic spring is proposed. The helical flexible spring is provided as a positive stiffness element for the system Bearing capacity, and numerical analysis of its axial stiffness characteristics by finite element modeling; by the two pairs of phase suction, coaxial configuration of three permanent magnets ring magnetic spring for the vibration isolation system to provide negative stiffness along the axial direction To reduce the natural frequency of the system. Based on the equivalent current model, the magnetic stiffness of the magnetic spring is discussed and the magnetic stiffness is linearly approximated near the equilibrium position. The vibration isolation performance of the two kinds of vibration isolators was compared by analyzing the displacement transmissibility of the designed low frequency vibration isolator and its corresponding linear vibration isolation system. The results show that the proposed low-frequency vibration isolation system can effectively isolate the low-frequency vibration and reduce the natural frequency of the system, and then widen the vibration isolation frequency band. At the same time, the damping characteristics of the vibration isolation system in the vicinity of the resonance region are further improved Reduce the resonant peak.