Research on Semi-active Control of Low Frequency Vibration of SAR Satellite under Fast Maneuvering Conditions

Synthetic Aperture Radar (SAR) satellite is a kind of high-resolution earth observation system. Due to the vibration sensitivity of the SAR antenna, maintaining the stability of the structure is the fundamental to ensure the imaging accuracy , so it is particularly important to suppress the vibration of the SAR satellite. In this paper, a finite element model of the SAR antenna with integrated relaxation dampers is established, the maneuvering conditions of the SAR satellite are simulated and analyzed, and the influence of the semi-active control on the vibration suppression effect of the SAR antenna is studied. The results show that the semi-active vibration control based on the relaxation damper has a good vibration suppression effect on the SAR antenna. The displacement amplitude is attenuated by more than 80% within 10s, and the time of complete attenuation is shortened by more than 50%. Provides a new idea for vibration suppression of large-scale SAR antennas, which has guiding significance for actual engineering.