Active Acoustic Control of a Rocket Fairing Using Spatially Weighted Transducer Arrays

摘要: Apreliminarystudy,includingexperimentalresultsforanovelactiveacousticcontrolapproachtoreducethelowfrequency modal response in a rocket fairing, is presented. The control method uses spatially weighted transducer arrays with H2 feedback laws to attenuate globally the targeted acoustic modes. nature of fairing problem described, theory approach discussed, and important feasibility issues regarding actual implementation are Several controllers were implemented on full-scale composite model small fairing. results demonstrate that controller was able reduce low-frequency modes by 6 ‐12 dB very little spillover. In addition, averaged reduction interior excess 3 over 20 ‐200-Hz bandwidth demonstrated. Thefeasibility studies indicate limitations actuatorpowerand volumetric displacement under launch conditions not necessarily prohibitive, but may be satise ed continued development actuator technology placement optimization.