Wave transmission and attenuation characteristics of EAP

초록

The wave transmission and attenuation behaviors of electro-active polymer (EAP) are investigated. Nonionic EAP is made by PVA (Polyvinyl Alcohol) with DMSO (dimethyl sulfoxide), and aluminum electrodes are made on both sides of the EAP. Two types of wave transmission experiments are performed. Acoustic waves are normally impinged upon the EAP plate and the transmitted sound pressure level is measured using microphones. The EAP plate exhibits a good passive damping performance at mid frequency region. When an electric field is applied, the resonance of EAP plate is shifted down due to the change of the thickness of the plate. This tunable characteristic is applicable for escaping a certain noise frequency.