柔索电动帆航天器自旋展开动力学建模与分析

One of the most promising propulsion strategies without internal energy resource consumption is the dynamic system of the electric-sail flexible tether with solar wind dynamic pressure acting on it. Deployment is driven by centrifugal force generated from the rotating end mass. The tether, which undergoes large deformation and rotation, performs strong geometric and material nonlinearity. Strong coupling occurs between rigid motion and deformation modes. For building the attitude model of the electric-sail with flexible tethers, discrete modeling of tether was conducted according to the finite segment method with flexible connection, thereby achieving the deployable mechanism with a flexible tether. For different driven angular velocity and end mass, the extension rate of tether, motion phase of the end, and tension force of rope have been considered in the spinning deployment process, where the driving angular velocity influences the deployment speed and change of motion phase of the flexible tether. Driven angular velocity affects driving angular velocity and change of motion phase of the flexible tether. Larger angular velocity indicates faster deployment speed and larger centrifugal force of the end generated with the increase of radius, which may cause the flexible tether to generate reverse winding. For the flexible tether with a larger slenderness ratio, adding the end mass can increase the stability of the spinning deployment of the electric sail. This study provides the foundation of structure design, sail shape maintenance and control for large deformation.