Fairing noise control using tube-shaped resonators

The potential for noise mitigation in composite Chamber Core fairings is investigated by using the walls of the fairing structure itself as acoustic resonators. This is the first documented application of long cylindrical tube-shaped resonators for fairing noise control. The theory and modeling of tube-shaped resonators for controlling fairing acoustic resonances is presented. The potential for noise mitigation in composite Chamber Core fairing using the walls of the fairing structure itself as acoustic resonators is investigated. Design criteria such as geometry, damping, spatial coupling, and robustness are considered for a variety of tube resonators. The results showed that a small number of tube resonators reduced the amplitude of low-frequency acoustic resonances by 10-12 dB in the test system and provided nearly 6 dB of reduction over the bandwidth from 0 to 400 Hz.