Acoustic load mitigation by non-porous absorbers in space launch vehicle
- Paper number
IAC-11,C2,1,12,x10784
- Author
Dr. Soon-Hong Park, Korea Aerospace Research Institute, Korea, Republic of
- Coauthor
Mr. Sang-Hyun Seo, Korea, Republic of
- Coauthor
Dr. Young-Soon Jang, Korea Aerospace Research Institute, Korea, Republic of
- Coauthor
Dr. Young-Moo Yi, Korea Aerospace Research Institute, Korea, Republic of
- Year
2011
- Abstract
Reduction of acoustic loads of space launch vehicles can be achieved by acoustic absorbers satisfying strict cleanness requirements. This limited the use of general porous materials and requires non-porous sound absorbers. With the array of Helmholtz resonators Micro-perforated panel absorbers (MPPA) could be one of promising sound absorbers satisfying the cleanness requirement for launch vehicles. In this paper the impedance model of micro-perforated panel absorbers at high incident sound pressure was proposed. The absorption characteristics of a micro-perforated panel absorber was investigated according to its design variables, e.g., minute hole diameters, aperture ratios and excitation levels. It was shown that optimal design in the high incident sound pressure level can be readily achieved by the proposed impedance model. Experiments were conducted to measure acoustic properties of the designed micro-perforated panel absorbers.
- Abstract document
- Manuscript document
(absent)