Deployment Dynamics, Control And Experiment Of Deployable Antennas

This dissertation is mainly concerned with the nonlinear influence on the deployment of the deployable space antennas. Several key technological problems, such as the flexible multi-body dynamic model and analysis, the deployment trajectory design, the deployment experiment, are dealt with. The author’s major contributions are outlined as follows:1. First of all, the dynamic model of hoop truss deployable antenna is established according to modal analysis and synthesis method for such a typical flexible multi-body dynamic model. Moreover, several nonlinear factors including friction, clearance and damping are taken into consideration in the deployment. Then the asynchronism of truss deployment and the influence of network tension on deployment are preliminary analyzed. Finally, the deployment dynamic response of hoop truss deployable antenna in orbit is predicted via a typical example, which lays a solid foundation on deployment trajectory design.2. In view of the large impact of deployment for deployable space antennas, a deployment trajectory design approach based on dynamic coupling of satellite and antenna is proposed in this paper. The coupling model of antenna deployment motion and satellite attitude stabilization is deduced. Then, the trajectory of driving cable is synthesized by Bezier curves, thus the trajectory of antenna deployment can be obtained by the kinematic equations of the antenna. Then, optimization method is used to select the Bezier curve and deployment time for the purpose of determining the minimum time with the constraints of deflection angle and angular velocity of the satellite. Numerical simulations demonstrate the rationality and feasibility of this design approach.3. Due to several complicated nonlinear dynamic issue in deployment, a 2-meter-diameter hoop truss deployable antenna model is designed and built. A systematic scheme for deployment dynamic experiment is made and then the experiment results are analyzed in detail.4.The deployment dynamics analysis module of the synthetic design platform is completed. The function, interface and procedure are presented. The module is validated by examples.