Diameter Radio-like Space Deployable Antenna Of Multi-body Dynamics Analysis

It becomes very imperative to develop a big caliber space antenna with reflective mesh and deployable truss structure for the development of the mobile communication, the Earth observation and the space exploration. At the present time, the hoop truss deployable satellite antenna(HTDSA) is in common use, but some disadvantages, such as low nature frequency, large driving torque, low deployed precision, make it an important and urgent work to develop a new type deployable space antenna.After the actual state of space deployable antenna having been investigated, firstly, a new type of big caliber space antenna with Radial Deployable Ribs and deployed mechanism combining the multistage linkage with a twin-screw thread transmission is excogitated in theory. Secondly, the mathematical model of a single rib of the deployed mechanism for the Redial Deployable Space Antenna's axis symmetrical character has been built using Newton-Euler method that based on multi-rigid body theory. Thirdly, flexible multibody dynamics is applied to the deployment analysis of the mechanism using the finite element method, substructure method and Lagrange Equation together. And then the numberical result is got using Runge-Kutta method under Matlab. Finally, ANSYS is applied to the dynamics analysis of the reflecter of the space antenna to calculate the dynamics characteristics such as the natural mode of vibration, harmonic response, impact response and random response.It is concluded that the deployed mechanism has its own advantages such as simple truss structure, high reliability of deployed, Simultaneous deployment, the controllable deployment, low impact and so on, and the flexible multibody dynamics simulation is feasible. The relations not only between cable strain and impact response, system stabilization and the parameter of the truss structure, but also between material damping and impact response are studied, and the rule is found.In this thesis, a new type of redial deployabe truss structure space antenna is excogitated, as well the the dynamics analysis method can be used in orther deployable mechanism, and the result provide support data to the structural parameter optimizing and damping design.