Analysis of movement and stability of the root lock mechanism of the space deployable mast

The root lock mechanism is a key component of the space deployable mast and influences the function of the mast directly. After analysis of the root lock mechanism, it is simplified as a kind of mechanism with two sliders and a spring. At first, when the mechanism carries out the lock actions, the vibration equation of the slider 2 is set up in the local coordinates, and then the displacement expression of the slider 2 is obtained in the whole coordinates by the coordinate transform. When the root lock mechanism is disturbed after the mast is locked, the vibration equation of the mechanism is set up. In the situation, stability of the root lock mechanism is analyzed, and relations and constraint conditions of the structural parameters are gotten. Actual values of these structural parameters are decided on further. Finally, numerical simulation is utilized to check up the movement of the root lock mechanism. After the analysis, selection of structural parameters is more reasonable and the design is more correct.