Control of Sound Radiation and Reflection With Advanced Smart Acoustic Blankets
Abstract
The work carried out in this project has successfully demonstrated the potential of advanced smart acoustic blankets for reducing sound transmitted into payload fairings. The smart blanket consists of active tiles embedded in standard acoustic blanket material. The lightweight honeycomb tiles are supported by specially developed active-passive piezoelectric mounts, which implement Thunder elements. The mounts are designed to provide passive isolation of transmitted sound, which is augmented by the application of active inputs in parallel to the mount. SISO uncoupled control approaches were developed in order to facilitate the future use of multiple active tiles. Both feedforward and feedback control approaches applied to a single tile located on a payload fairing like structure provided good reduction of broadband transmitted sound. The feedback approach is especially attractive due to its low complexity and cost effectiveness of hardware. An analytical model of the active tile system applied to a base structure has been developed and used to optimally design the system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2002
- Accession Number
- ADA410055
Entities
People
- Chris R. Fuller
Organizations
- Virginia Tech