Fabrication and Vibration Control of Graphite Composite Smart Structure

• Main Authors: Lai, Wei-Zen, 賴威任
• Other Authors: S.M. Yang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/48510132408606911894

碩士 === 國立成功大學 === 航空太空工程學系 === 84 === Fabrication and Vibration Control of Graphite Composite Smart Structure Abstract The technique of embedding piezoelectric element and optical fiber in graphite composite structures is developed. The piezoelectric material is insulated by a composite cure sealant tape(AIR TECH GS B55) to prevent the "short-circuit" condition with the graphite laminated layers. A smart structure speciment is fabricated, and the natural frequencies and mode shapes are predicted by a finite element model and validated by experimental modal testing. Experiments show that the embedded piezoelectric materials can be successfully applied as sensor for vibration measurement and as actuator for vibration suppression. The control performence of vibration suppression is improved either by increasing the number of actuators or by higher feedback gain. A Michelson interferometer by the single-mode optical fiber is also employed as a vibration measurement sensor. It is shown that the structure vibration can be controlled effectively by using the optical fiber sensor and the embedded piezoelectric actuator.