Dynamic modeling of combined reaction wheel and vibration isolation platform system

To analyze the attenuation effect of vibration isolation platform for reaction wheel (RW) disturbances, the dynamic modeling problem of the combined system which includes an imbalance RW and a passive Stewart platform with kinetic base platform was studied. The precise dynamics formulation was derived. The equations show that there are coupling effects between the RW and the platform, and rotor imbalance can also produce additional coupling disturbances other than tonal disturbances. The magnitudes of these disturbances were investigated and a reduction of the system model was made accordingly. Numerical simulations were conducted to compare the reduced system model to the complete one, which check the validity of the reduced model. And a primary simulation for whole spacecraft system shows that the vibration isolation system could improve the attitude stability effectively.