Description And Influence Mechanism Of Cable-net During Mesh Antennas Deployment

This dissertation is mainly about the deployment analysis considering the cable-net effect on deployable antenna. In order to figure out the nonlinear influence of the cable-net, several key problems like the description of slack cable-net in deployment, cable-net tension analysis and cable-net dynamic analysis were investigated. The relevant studies can be described as follows.1. A form-finding method is proposed to model the slack/tensioned cable-net based on the elastic catenary elements(ECEs). According to the characteristic of ECEs, an optimization model is established and deduced to solve this nonlinear form-finding problem of slack cable-net. Via the result of the optimization model, the shape and tension of each cable can be obtained, which provides the foundation for deployment analysis in latter sections.2. The deployment of antennas is investigated to obtain the nonlinear mechanism by considering cable-net tension effect. The dynamic model of deployable antenna is established firstly. Then, the mechanism analysis problem of cable-net during deployment is discretized to several instantaneous structural analysis problems. Hence, the shape and tension of each cable for each instantaneous operating condition could be calculated. Synthesizing all discrete instantaneous analysis results, time-dependent cable-net tension curve could be obtained and then applied to the dynamic model of deployable antenna as external loads, thus achieving the dynamic property analysis of deployment.3. The dynamic model which combines cable-net and antenna truss is built to make a further research on its dynamic property. The kinetic energy, the geopotential energy and the elasticity energy of ECEs are deduced and the second type of Lagrange equation is used to establish the cable-net dynamic model. And then the combination dynamic model of the cable-net and the antenna truss could be obtained. Based on a 2-m-aperture prototype model, numerical simulations and experiments are conducted. The results show the validity and rationality of this method.