挠性桁架式卫星低频振动抑制研究

Research on Suppression of Low Frequency Vibration of Flexible Truss of Satellites

针对空间挠性桁架的低频振动抑制问题,提出串联松弛型阻尼器的方案。建立集成松弛型阻尼器的桁架结构有限元模型,通过仿真分析机动工况和稳态工况下采用阻尼器抑制桁架结构振动的效果,研究阻尼器参数以及布局对振动抑制效果的影响,获取阻尼器的最佳参数值及安装位置。结果表明安装阻尼器后,机动工况下桁架末端位移幅值10 s内衰减70%以上,稳态工况下共振峰降低80%以上,抑制振动效果较好。该研究为大型挠性部件的振动抑制提供新的思路,对实际工程具有指导意义。

Aiming at the problem of low frequency vibration suppression of space flexible truss of satellites,the scheme of installing relaxation dampers was proposed.A finite element model of the truss structure with relaxation dampers was established,and the satellite maneuvering conditions and steady-state conditions were simulated.The influence of the damper parameters and layout on the vibration suppression effect of the truss was studied.The optimum parameters and installation position of dampers were obtained.The results show that with relaxation dampers installed,the displacement amplitude of truss end under maneuvering conditions was attenuated by more than 70 % within 10 s,the resonance peak under steady-state conditions was reduced by 80 %.Relaxation damper has a great vibration suppression effect for low frequency vibration of truss structure.The damping coefficient,stiffness,and stiffness ratio of the relaxation damper have obvious impact on the low-frequency vibration suppression effect.This work provides a new idea for the vibration suppression of large flexible components and has a guiding significance for actual engineering.