Research For Stability Based On Thermally-induced Vibrations Of Large Deployable Antenna

The deployable antenna with surrounding truss has been developed in recent years. It is characterized by large scale, light weigh and swift dynamic response. The antenna is composed of flexible rope and boom, which determines its poor performance in maintaining stiffness of whole framework. In sequence, the antenna is prone to encountering the problem of vibration under variable temperature field. If the amplitude of vibration is higher, or the action is went on in a longer period of time, the performance of receiving and feeding back electrical signal will be weakened, so does the stability of spacecraft's attitude. So it is significant to research the stability of this antenna, aiming at thermally-induced vibrations under the variable temperature field.In this paper, a deployable antenna with surrounding truss with 8.5m diameter was built up. In a series of on-orbit circumstance, the temperature field of antenna was analyzed with I-DEAS software. Loading achieved temperature files on this structure after managing, it calculated the change of precision of whole antenna's feedback face and the change of displacement of appointed node during three different periods of time, which means the stability of antenna was analyzed from local and whole angle. Synchronously, it researched the modes of antenna. The influencing factor for the static and dynamic characteristic of antenna and the rule of response during the different period of time of antenna was elementarily mastered, which is useful to instructing engineering-oriented design.