| The solar panels are the main energy supply system of the spacecraft. During the process of sending and entering into-orbit for the spacecraft, the solar panels undergoes two stages: folding fixed and unlocking deployment. The thesis introduces a release device which utilized Shape Memory Alloy (Shape Memory Alloy) as release actuator, and the device can guarantee proper locking and releasing of the solar panelsThis thesis is funded by independent subject of the Defense key laboratories, with the following work done:Firstly, the model of SMA-spring actuator has been established. According to the constitutive law of SMA material, we do the one-dimensional mathematic model derivation of the actuator. According to Joule effect, we do the time-temperature relationship derivation of the process of heating the SMA material by electric current, deduce strain-stress-temperature-time relationship of the actuator which is the theoretical basis of practical SMA-spring actuator design.Secondly, the structure has been designed and manufactured already. The release device is designed with the hook model and preloaded by spring which can guarantee the connection reliably. According to the least release time and the proper work displacement, the thesis has designed the SMA-spring actuator. The motion simulation, with the help of ADAMS, detect the movement velocity of the release device and verify the feasibility of the project. In order to optimize the results of the ground test, the motion simulation is carried on the basis of the ground test condition, to determine the most important effect factor.Lastly, according to the simulation results, experimental hanging structure has been established which can imitate the space installation of the release device. The experimental circuit has been designed which can measured the release time accurately,.The results obtained from the research of this thesis show that: the release mechanism based on SMA can achieve the expected technique data, and the synchronous property is rather good. Also the device is light, small, and reusable. |
