Research Of Thermally Induced Vibration For Optical System And Temperature Effects Upon Large-Diameter Antenna

This paper carried out research in two areas: analysis of thermally induced vibration for Optical System and temperature effects upon Large-Diameter Parabolic Antenna.In the study of Optical System, the effect of thermal environment to structural dynamic response and its thermally induced vibration under transient thermal shock was analyzed. The finite element method of structural dynamic response in thermal gradient was determined by an example of plate in the first part of the study. Then this method is applied to the Optical System, the structural dynamic response of impact in thermal gradient was analyzed and the regularity of thermal gradient to its structural dynamic response was determined. Thermally induced vibration of a plate was determined according to non-coupling dynamics and finite element method in the second part of the study. Then this method is applied to the Optical System. Thermal dynamic forces simulated by a half sine wave thermal shock. Typical model node displacement and stress, as well as root mean square of the primary mirror surface induced by the thermal dynamic forces were discussed. At the same time, the results of dynamic response were compared to the static response.In the study of Large-Diameter Parabolic Antenna, annual and solar temperature effect of a large-diameter antenna was analyzed according to finite element method. In terms of annual temperature variation, thermal deformation and thermal stress of the antenna was discussed. On the other hand, the transient time-history temperature field of its panel was computed in the summer solstice as one of the most adverse weather conditions. At the same time, the panel temperature loaded to the antenna model and the approximate solar temperature field of the antenna was computed. Finally, structure of the stress and root mean square of antenna with time law were discussed.At present, the research on the above is just beginning, for this situation, the paper conducted a preliminary attempt to explain relevant theory and research methods. The paper provides valuable guidance to improve the thermal-structural design for Optical System and Large-Diameter Parabolic Antenna.