| Citation: | WANG G H，YAN Z J，JI C，et al. Study on buffeting test of large diameter fairing launch vehicles selection[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（12）：3230-3236 （in Chinese）
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The envelope size of the fairing will be recommended during the first stage of launch vehicle design in accordance with the satellite’s envelope size requirements, which also affects the launch vehicle’s basic configuration design. To predict the buffeting risk of this configuration, the aerodynamics design team will carry out transonic aerodynamic buffeting test research in the aspect of the specific launch vehicle configuration size, frequency, and stiffness data. In this paper, the buffeting test technology of the full elastic model is adopted, and the research goal is to carry out the buffeting test in two directions for three configurations of 5 m diameter fairing of a certain rocket. The buffeting risk of the three configurations is evaluated by using the eigen system realization algorithm. The research findings indicate that the first-order elastic model of the 5.2 m diameter faring + 3.35 m diameter three-stage configuration has a quick response to incoming flow and a small response amplitude, and that the aerodynamic damping values of the first and second free-free bending modes are both positive. As a result, it can be used as the shape design solution for the large-diameter fairing of the medium-sized launch vehicle in our country.
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