Vibration Suppression Control with Frequency Shaping for Mechanical Cooler of High Precision Observation Satellite

抄録

In satellites, micro mechanical vibrations generated by mechanical parts such as mechanical cryocoolers and reaction wheels have become a problem. It has been pointed out that these vibrations lead to a decrease in pointing accuracy, and the vibration energy becomes heat, which reduces the cooling efficiency of the cryocoolers. For this problem, active control is required to suppress vibration by applying a control signal to a mechanical actuator that generates vibration. Based on the fact that vibration has a periodic signal and applied a control method using repetitive control. In repetitive control, it is essential to design a filter that compensates for amplitude and phase in order to ensure stability. In this paper, on the assumption that frequency characteristics are estimated online in advance, we proposed a filter design method for designing robust and stable gains based on the estimation results. It is assumed that the plant model obtained by the estimation includes modeling errors and the influence of harmonics due to nonlinear components. The proposed method not only simply solves the inverse model characteristics of the plant, but also considers the interference between harmonic disturbances due to nonlinearity and modeling error, by designing the gain, stable control can be achieved robustly.