Transactions of Nanjing University of Aeronautics & Astronautics
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Dynamics and Attitude errors Analysis for Dock Test system of Small Satellite
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Abstract:
In order to analyze the attitude errors of the vertical docking test system of small satellite, the static error and kinematic error of test system are taken into account. The working principle of test system and coordinate of actuator are introduced. The model of friction torque on the joints and torque on the docking mechanism are built. Dynamics equation of actuator is built by Lagrange equation and Nielsen equation. Under the condition of 24 different angle groups, the calculation of dynamics equation is completed by using MATLAB/SIMULINK platform and kinematic errors of actuator are obtained. The attitude error models of docking mechanism are built. Results shows that the main angle error sources of yaw, row, pitch are not identical. The attitude error of yaw angle can be decreased by compensating the angle error around axis-x. The attitude error of row angle mainly originates in system error, which can be eliminated by adjusting non-orthogonal degree.
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