The Research of Micro-vibration Nonlinear Characteristic Produced by Spacecraft Mechanical Momentum Wheel

Micro-vibration produced by momentum wheel is the main disturbance source for spacecraft, with obvious nonlinear characteristics. The researching and general situation of spacecraft micro-vibration produced by momentum wheel, includes vibration sources mechanism, dynamic model and vibration control methods, are briefly reviewed in this paper. The nonlinear characteristic, frequency and amplitude of micro vibration, are analyzed respectively. The momentum wheel’s nonlinearity is shown in two respects: the nonlinearity of amplitude and the nonlinearity of frequency. The movement of moving parts is the fundamental cause for micro-vibration and nonlinearity. The main source of frequency non-linearity is the rolling bearing. Passive or active vibration control method which is essentially using dampers or piezoelectric actuators to realize vibration isolation. The paper discusses the researching contents and direction of these problems mentioned. In the end, some comments are made about the future development in this field.