With the growth of aerospace demand, large-scale launch vehicles have begun to be used in the launch of large-scale low-Earth orbiting spacecraft and large-scale communication satellites, which has brought more serious vibration and noise problems. In order to reduce the noise level in the fairing during rocket launch and flight, improve the safety of the payload, and ensure the completion of the launch mission, many countries have carried out a lot of research work.
Among the many noise reduction technologies, porous materials have the advantages of light weight and strong high-frequency sound absorption capabilities, while Helmholtz resonators have strong low-frequency sound absorption capabilities, so the former or a combination of the two are mostly used in the fairings of large-scale launch vehicles in various countries.
Melamine foam and horn-shaped Helmholtz resonator are used as the noise mitigation scheme in the fairing, and the method of combining theoretical analysis, numerical simulation and experimental verification is used to develop the acoustic characteristics of melamine foam and Helmholtz resonator.
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