Experimental Study on Effects of Elastomer Coating on the Vibration-Damping Property of Steel and CFRP Plates for Ship's Hull

Abstract

Vibration-damping properties have been studied for steel and CFRP (Carbon Fiber Reinforced Plastics) plates coated with viscoelastic elastomer which are applied for ship's hull materials with the aim of reducing the vibration noise. In the present. study, vibration loss factor of the coated materials and original components have been measured by the standard method as determined in JIS G 0602. The loss factor and the Young's modulus of the elastomer in a range of the frequency of the decrease object for reducing the vibration noise have been computed by the conversion frequency nomogram. In this calculation, the temperature-frequency conversion rule is used, which is obtained from the measurement of the loss factor and the resonance frequency characteristics. As a result of above experiments and calculations, a method for reducing the radiation noise by coating hull with elastomer is proposed.