Integrated Acoustic Analysis of Payload Fairing Using an FE-SEA Hybrid Method

To ensure the stability of the launch vehicle payload, we developed an integrated acoustic analysis method. The integrated process involved three key steps: first, the acoustic load was derived by extracting the inputs required for the empirical model through numerical analysis, the results of which were in agreement with the experimental results. Second, depending on the frequency bands, the acoustic load on the fairing was calculated by performing a finite element analysis and statistical energy analysis for low and high frequencies, respectively. Third, we optimized the design parameters of a Helmholtz resonator using the particle swarm optimization algorithm and modeled the various shapes of an acoustic blanket. The internal acoustic load specification of the fairing was satisfied, and the results were noted to be consistent with the experiment results. The proposed method can be adopted in the launch vehicle development phase.