Experimental investigation on the application of shunted piezoelectric materials for the enhancement of acoustic insertion loss in cylindrical structures
- Paper number
IAC-08.C2.5.8
- Author
Dr. Soon-Hong Park, Korea Aerospace Research Institute, Korea, Republic of
- Coauthor
Mr. Sang-Hyun Seo, Korea, Republic of
- Coauthor
Dr. Young-Moo Yi, Korea, Republic of
- Year
2008
- Abstract
Acoustic and vibration reduction performance of aerospace structures become more important design parameter than ever because light weight composite materials are being popular in manufacturing aerospace structure. For example, in designing the payload fairing of a launcher the reduction of acoustic load is one of major concern. In order to reduce the internal acoustic load acoustic treatment is common practice. Many commercial airplanes and launch vehicles employ acoustic blankets to reduce the acoustic loads. However, the drawback of the acoustic blanket treatment is that its function is limited to the mid to high frequency range. Acoustic load reduction in low frequency range can be limited by conventional acoustic treatment. If a noise reduction target in the low frequency range is closely related to the vibration of the structure, an appropriate assessment would be a method which can increase the structural damping. The use of visco-elastic materials require significant mass budget for required vibration reduction, therefore this is not suitable for aerospace application. One of promising dampening method is to utilize piezoelectric materials. In this paper the application of a piezoelectric damping on a cylindrical structure subject to acoustic loading is studied. A testing cylindrical structure was fabricated to examine the feasibility of shunted piezoelectric damping. For the broad band acoustic reduction both conventional acoustic treatment and piezoelectric materials with resistive shunt were applied to the cylinder. The applicability of the piezoelectric materials with electrical shunt for the improvement of insertion loss is demonstrated. The effect of coverage of the piezoelectric materials is also discussed.
- Abstract document
- Manuscript document
(absent)