| With the rapid development of aerospace industry, there has been a wide variety of antennas to meet the need of all kinds of projects. As a light weight and large flexible antenna, membrane antenna has important significance for national defense, aerospace, aviation and the other areas. Membrane antenna is packed and curled tightly in the payload capsule before the spacecraft is launched. As released in orbit, this mechanism was driven by motors to deploy the CFRP booms of the membrane antennas to bilateral directions, to expand the plane of the membrane antennas, and to help recovering the section of the booms to get a better flatness and rigidity.This paper is based on domestic and independent research and development of the pod-shaped CFRP booms developed a set of deployment antennas used for expanding the membrane Antennas. Comparing to the mechanism of Russia, the mechanism built in this paper is much more ingenious, more reliable and light weight. The mechanism and its control system offer a high-performance and high reliability solution for the deployable booms of the membrane antennas.Firstly, the best option of mechanical system is determined through program demonstration based on function of the deployment mechanism and technical indicators, then the overall configuration and working principle of mechanical system in deployment mechanism is described, and the mechanical transmission parts and auxiliary support agencies of the deployment mechanism are designed in detail, finally, the limit position of the deployment mechanism is determined and the mechanical interfaces between the mechanism and the support platform, CFRP booms, plane and other parts are designed .Secondly, the kinematics of deployment mechanism is analyzed based on principles and methods of kinematics, the drive components are selected by means of the parameters calculation of rotational speed and torque according to the completed design of mechanical system to ensure the normal operation of organizations; the static analysis on the key components of the body is implemented to ensure the mechanical properties in the permitted range, so that the specified action can be completed successfully.Then, the control system is designed for deployment mechanism for CFRP booms of the membrane antennas. Due to synchronous requirements of the position and speed of the deployment mechanism of are very high, a location closed loop servo control is selected. Control hardwires, including control panel or PC Debug control unit, the core micro-controller unit and servo control unit, is designed; and the software system which includes master and control unit is designed based on the hardware. With the remarkable control system, the deployment mechanism is able to corotation of the roller, deployment of the arms, retracting of the arms and reversion of the roller.Finally, an experiment system is designed in order to test deployment mechanism for CFRP booms of the membrane antennas. The results show that the developed deployment mechanism for deployable CFRP booms of the membrane antennas can expand and collect pod-shaped booms flexibly, and can flatten and summon the cross-section of pod-shaped booms; the requirements of evenness of the plane of the membrane antennas and the stiffness of the system are reached. All illustrate that the development of deployment mechanism for deployable CFRP booms of the membrane antennas has a high applicable value. |
