整星隔振平台的阻尼非线性对隔振性能影响的物理机理

Physical mechanism for effect of nonlinear damping of a whole-spacecraft vibration isolation platform on its vibration-isolation behaviors

从物理机理出发,用变形的三次多项式函数和分数导数阶算子建立了离散型隔振系统的非线性等效动力学模型,通过谐波平衡法得出从隔振器底端到卫星的振动传递率,利用数值解从物理机理上解释了地面实验中隔振系统的振动传递率受激励幅值影响的现象,为离散型整星隔振平台及其他整星隔振平台的设计和实际应用提供参考。

Starting from physical mechanism,the nonlinear equivalent dynamic model of a discrete vibration isolation system was built with the deformation of a cubic polynomial function and fractional derivative operator,and the vibration transmissibility from the bottom of the isolator to the satellite was obtained using harmonic balance method.The phenomenon that the vibration transmissibility of the vibration isolation system is affected by excitation amplitude in ground tests was explained from physical mechanism using numerical solutions.The results provided a reference for design and practical application of a discrete whole-spacecraft vibration isolation platform.